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Li Y, Chen Y, Sun F, He L, Zhao Y. Study on the effect of biochar combined with Fenton oxidation on the aerobic composting of sludge. ENVIRONMENTAL TECHNOLOGY 2024; 45:1374-1387. [PMID: 36322505 DOI: 10.1080/09593330.2022.2143289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Accepted: 09/29/2022] [Indexed: 06/16/2023]
Abstract
Biochar was derived from rice straw pyrolyzed at 400°C, and biochar was added to the excess sludge at the ratio of 10% DS, 25% DS, and 50% DS as a supplementary skeleton for sludge Fenton pre-treatment. Rice husk biochar mixed with fungus residue as compost conditioner. In this study, we explored the effects of seven groups of composting materials on the composting effect and fertilizer quality under different pre-treatment methods of Fenton-pretreated sludge cake and conventional dewatered sludge cake, and different biochar additions. Specifically, we conducted a 22-day composting experiment using a composting reactor to investigate the effect of rice husk biochar combined with Fenton oxidation on the physicochemical properties of sludge composting. The results of this study showed that the FB50 group significantly increased the composting rate. Nutrient analysis showed that the FB50 group was rich in fertilizer nutrients, such as available phosphorus, and alkali-hydrolyzable nitrogen content increased. Heavy metals (Cu, Cd, Cr, Pb, Zn, Ni) met China's 'Agricultural Sludge Pollutant Control Standard' GB 4284-2018 Grade A standard, with obvious passivation and significantly reduced bioavailability. All these results suggested that biochar coupled with Fenton oxidation was more beneficial to sludge composting.
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Affiliation(s)
- Yanjun Li
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, People's Republic of China
| | - Yu Chen
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, People's Republic of China
| | - Fei Sun
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, People's Republic of China
| | - Liwenze He
- School of Civil Engineering, Southwest Jiaotong University, Chengdu, People's Republic of China
| | - Yuting Zhao
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, People's Republic of China
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2
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Wang K, Chen Y, Cao MK, Zheng GD, Cai L. Influence of microbial community succession on biodegradation of municipal sludge during biodrying coupled with photocatalysis. CHEMOSPHERE 2024; 349:140901. [PMID: 38065267 DOI: 10.1016/j.chemosphere.2023.140901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 11/09/2023] [Accepted: 12/03/2023] [Indexed: 12/23/2023]
Abstract
A 20-day sludge biodrying process was coupled with photocatalysis to improve biodrying efficiency and investigate the effect of photocatalysis on biodegradation. After biodrying, the moisture content in the coupled photocatalytic group (TCA) and the control group (TUCA) decreased from 63.61% to 50.82% and 52.94%, respectively, and the volatile solids content decreased from 73.18% to 63.42% and 64.39%, respectively. Neutral proteinase activity decreased by 9.38% and 28.69%, and lipase activity decreased by 6.12% and 26.17%, respectively, indicating that photocatalysis helped maintain neutral proteinase and lipase activities. The Chao1 and Shannon indices showed that photocatalysis increased fungal diversity and reduced bacterial richness and diversity. The β diversity clustering analysis indicated that the bacterial community structure during the thermophilic phase in TCA differed from that in TUCA. The Kyoto Encyclopedia of Genes and Genomes annotation showed that photocatalysis has the potential to promote the synthesis and degradation of ketone bodies. Biodrying coupled with photocatalysis can improve the dewatering of sludge without negatively affecting biodegradation.
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Affiliation(s)
- Kan Wang
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, China
| | - Ying Chen
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, China
| | - Meng-Ke Cao
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, China
| | - Guo-Di Zheng
- Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
| | - Lu Cai
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, China.
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3
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Yang B, Liu Q, Liu Y, Huang T, Zhao Y, Li D, Pan X. Biofilm-developed biomass residues as novel bulking agents and microbial carriers for synergistically enhanced bioevaporation: Degradation potential and contribution to metabolic heat. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 344:118570. [PMID: 37459810 DOI: 10.1016/j.jenvman.2023.118570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Revised: 06/28/2023] [Accepted: 07/01/2023] [Indexed: 09/17/2023]
Abstract
Economical and easily prepared bulking agents and microbial carriers are essential in the practical application of bioevaporation process. Biofilm-developed biomass residues not only provide structural support and microbial sources but also may contribute metabolic heat to the bioevaporation process, achieving the enhanced water evaporation and synergistic treatment of biomass residues. In this study, biofilm was cultivated on the rice straw, wheat straw, sawdust, corncob, luffa cylindrica and palm first, then those biofilm-developed biomass residues were successfully used as the bulking agents and microbial carriers in food waste bioevaporation. The degradation potential (volatile solid degradation ratio) of those biomass residues was in the order of corncob (23.96%), wheat straw (21.12%), rice straw (14.57%), luffa cylindrica (11.02%), sawdust (-2.87%) and palm (-9.24%). It's primarily the degradation of the major components, cellulose and hemicellulose, in corncob and wheat straw governed the metabolic heat contribution (91.73 and 79.61%) to the bioevaporation process. While the high lignin content in sawdust (14.57%) and palm (28.62%) caused negligible degradation of cellulose and hemicellulose, hence made them only function as structural supporter and did not contribute any metabolic heat. Moreover, though the metabolic heat contribution of rice straw and luffa cylindrica reached 58.19 and 37.84%, their lowest lignocellulose content (62.99 and 65.95%) and their lower density, as well as the dominated Xanthomonas (bacteria) and Mycothermus (fungi) led to their rapid collapse during the repeated cycles of bioevaporation. The greatest abundance of thermophilic bacteria (22.3-88.0%) and thermophilic fungi (82.0-99.3%) was observed in the corncob pile. Furthermore, considering the Staphylococcus (pathogenic bacteria) and Candida (animal pathogen) was effectively inhibited, the biofilm-developed corncob was the most favorable bulking agents and microbial carrier for the synergistic bioevaporation of highly concentrated organic wastewater and biomass residues.
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Affiliation(s)
- Benqin Yang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Qiuyun Liu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Yanmei Liu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China; College of Environmental Science and Engineering, China West Normal University, Nanchong, 637009, China
| | - Tianxiao Huang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Yanqing Zhao
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Dongfang Li
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, China
| | - Xuejun Pan
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China.
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Teng F, Tan G, Liu T, Zhang T, Liu Y, Li S, Lei C, Peng X, Yin H, Meng D. Inoculation with thermophiles enhanced the food waste bio-drying and complicated interdomain ecological networks between bacterial and fungal communities. ENVIRONMENTAL RESEARCH 2023; 231:116299. [PMID: 37268211 DOI: 10.1016/j.envres.2023.116299] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 04/23/2023] [Accepted: 05/31/2023] [Indexed: 06/04/2023]
Abstract
Bio-drying is a practical approach for treating food waste (FW). However, microbial ecological processes during treatment are essential for improving the dry efficiency, and have not been stressed enough. This study analyzed the microbial community succession and two critical periods of interdomain ecological networks (IDENs) during FW bio-drying inoculated with thermophiles (TB), to determine how TB affects FW bio-drying efficiency. The results showed that TB could rapidly colonize in the FW bio-drying, with the highest relative abundance of 5.13%. Inoculating TB increased the maximum temperature, temperature integrated index and moisture removal rate of FW bio-drying (55.7 °C, 219.5 °C, and 86.11% vs. 52.1 °C, 159.1 °C, and 56.02%), thereby accelerating the FW bio-drying efficiency by altering the succession of microbial communities. The structural equation model and IDEN analysis demonstrated that TB inoculation complicated the IDENs between bacterial and fungal communities by significantly and positively affecting bacterial communities (b = 0.39, p < 0.001) and fungal communities (b = 0.32, p < 0.01), thereby enhancing interdomain interactions between bacteria and fungi. Additionally, inoculation TB significantly increased the relative abundance of keystone taxa, including Clostridium sensu stricto, Ochrobactrum, Phenylobacterium, Microvirga and Candida. In conclusion, the inoculation of TB could effectively improve FW bio-drying, which is a promising technology for rapidly reducing FW with high moisture content and recovering resources from it.
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Affiliation(s)
- Fucheng Teng
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China; Key Laboratory of Biometallurgy, Ministry of Education, Changsha, 410083, China
| | - Ge Tan
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China; China Tobacco Hunan Industrial Co., Ltd., Changsha, 410014, China
| | - Tianbo Liu
- China Tobacco Research Institute of Hunan Province, Changsha, 410004, China
| | - Teng Zhang
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China; Hunan Urban and Rural Environmental Construction Co., Ltd, Changsha, 410118, China
| | - Yongjun Liu
- China Tobacco Research Institute of Hunan Province, Changsha, 410004, China
| | - Sheng Li
- College of Resources & Environment, Hunan Agricultural University, Changsha, 410128, China
| | - Can Lei
- Changsha Leibang Environmental Protection Technology Co., Ltd, Changsha, 410199, China
| | - Xing Peng
- Hunan Renhe Environment Co., Ltd, Changsha, 410022, China
| | - Huaqun Yin
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China; Key Laboratory of Biometallurgy, Ministry of Education, Changsha, 410083, China
| | - Delong Meng
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China; Key Laboratory of Biometallurgy, Ministry of Education, Changsha, 410083, China.
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Alloun W, Berkani M, Benaissa A, Shavandi A, Gares M, Danesh C, Lakhdari D, Ghfar AA, Chaouche NK. Waste valorization as low-cost media engineering for auxin production from the newly isolated Streptomyces rubrogriseus AW22: Model development. CHEMOSPHERE 2023; 326:138394. [PMID: 36925000 DOI: 10.1016/j.chemosphere.2023.138394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 02/26/2023] [Accepted: 03/11/2023] [Indexed: 06/18/2023]
Abstract
Indole-3-acetic acid (IAA) represents a crucial phytohormone regulating specific tropic responses in plants and functions as a chemical signal between plant hosts and their symbionts. The Actinobacteria strain of AW22 with high IAA production ability was isolated in Algeria for the first time and was characterized as Streptomyces rubrogriseus through chemotaxonomic analysis and 16 S rDNA sequence alignment. The suitable medium for a maximum IAA yield was engineered in vitro and in silico using machine learning-assisted modeling. The primary low-cost feedstocks comprised various concentrations of spent coffee grounds (SCGs) and carob bean grounds (CBGs) extracts. Further, we combined the Box-Behnken design from response surface methodology (BBD-RSM) with artificial neural networks (ANNs) coupled with the genetic algorithm (GA). The critical process parameters screened via Plackett-Burman design (PBD) served as BBD and ANN-GA inputs, with IAA yield as the output variable. Analysis of the putative IAA using thin-layer chromatography (TLC) and (HPLC) revealed Rf values equal to 0.69 and a retention time of 3.711 min, equivalent to the authentic IAA. AW 22 achieved a maximum IAA yield of 188.290 ± 0.38 μg/mL using the process parameters generated by the ANN-GA model, consisting of L-Trp, 0.6%; SCG, 30%; T°, 25.8 °C; and pH 9, after eight days of incubation. An R2 of 99.98%, adding to an MSE of 1.86 × 10-5 at 129 epochs, postulated higher reliability of ANN-GA-approach in predicting responses, compared with BBD-RSM modeling exhibiting an R2 of 76.28%. The validation experiments resulted in a 4.55-fold and 4.46-fold increase in IAA secretion, corresponding to ANN-GA and BBD-RSM models, respectively, confirming the validity of both models.
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Affiliation(s)
- Wiem Alloun
- Laboratory of Mycology, Biotechnology and Microbial Activity (LaMyBAM), Department of Applied Biology, Constantine 1 University, BP, 325, Aïn El Bey, Constantine, 25017, Algeria.
| | - Mohammed Berkani
- Biotechnology Laboratory, National Higher School of Biotechnology, Ali Mendjeli University City, BP E66, 25100, Constantine, Algeria.
| | - Akila Benaissa
- Pharmaceutical Research and Sustainable Development Laboratory (ReMeDD), Department of Pharmaceutical Engineering, Faculty of Process Engineering, Constantine 3 University, Constantine, 25000, Algeria
| | - Amin Shavandi
- 3BIO-BioMatter Unit, École Polytechnique de Bruxelles, Université Libre de Bruxelles (ULB), Avenue F.D. Roosevelt, 50-CP 165/61, 1050, Brussels, Belgium
| | - Maroua Gares
- Laboratory of Mycology, Biotechnology and Microbial Activity (LaMyBAM), Department of Applied Biology, Constantine 1 University, BP, 325, Aïn El Bey, Constantine, 25017, Algeria
| | - Camellia Danesh
- The University of Johannesburg, Department of Chemical Engineering, P.O. Box 17011, Doornfontein, 2088, South Africa.
| | - Delloula Lakhdari
- Biotechnology Laboratory, National Higher School of Biotechnology, Ali Mendjeli University City, BP E66, 25100, Constantine, Algeria; Research Center in Industrial Technologies CRTI, P.O. Box 64, Cheraga 16014, Algiers, Algeria
| | - Ayman A Ghfar
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - Noreddine Kacem Chaouche
- Laboratory of Mycology, Biotechnology and Microbial Activity (LaMyBAM), Department of Applied Biology, Constantine 1 University, BP, 325, Aïn El Bey, Constantine, 25017, Algeria
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Yu B, Chen T, Wang X, Yang J, Zheng G, Fu L, Huang X, Wang Y. Insights into the effect mechanism of back-mixing inoculation on sewage sludge biodrying process: Biodrying characteristics and microbial community succession. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 857:159460. [PMID: 36257443 DOI: 10.1016/j.scitotenv.2022.159460] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 09/29/2022] [Accepted: 10/12/2022] [Indexed: 06/16/2023]
Abstract
Back mixing was frequently used to replace conventional bulking agenting, however, however, the internal effect mechanism was unclear. This study compared four bulking agents: mushroom residue (MR), MR + primary BM (BM-P), BM-P, and secondary BM (BM-S). The effect mechanism of back mixing (BM) inoculation was assessed based on biodrying performance and microbial community succession. Four trials (Trial A, Trial B, Trial C, and Trial D) reached maximum temperatures of 61.9, 68.8, 73.7, and 69.9 °C on days 6, 3, 2, and 2, respectively. Application of BM increased pile warming rate and resulted in higher temperatures. Temperature changes and microbial competition lead to decline in microbial diversity and richness during the biodrying process. Microbial diversity increased of four biodried products. The number of microorganisms shared by Trial A, Trial B, Trial C, and Trial D were 90, 119, 224, and 300, respectively. The addition of BM improved microbial community stability, and facilitating the initiation of biodrying process. Microbial genera that played an important role in the biodrying process included Ureibacillus, Bacillus, Sphaerobacter, and Tepidimicrobium. Based on these results, it was concluded that BM was efficient method to enhanced the microbial activity and reduced the usage of bulking agent.
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Affiliation(s)
- Bao Yu
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tongbin Chen
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiankai Wang
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; Yangtze Eco-Environment Engineering Research Center, China Three Gorges Corporation, Beijing 100038, China
| | - Junxing Yang
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guodi Zheng
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Lili Fu
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China; Beijing Greentech Technology Group Co.Ltd., Beijing 100080, China
| | - Xue Huang
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China; Beijing Greentech Technology Group Co.Ltd., Beijing 100080, China
| | - Yagen Wang
- Beijing Greentech Technology Group Co.Ltd., Beijing 100080, China
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7
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Li Q, Zhang K, Yang Z, Guo H, Zheng X, Zhang Q, Xiong J, Lu X. Dynamic changes of microbial community and moisture ratio during bio-drying of sludge after electro-dewatering. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 324:116366. [PMID: 36183534 DOI: 10.1016/j.jenvman.2022.116366] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 09/05/2022] [Accepted: 09/22/2022] [Indexed: 06/16/2023]
Abstract
Using electro-dewatering as the pretreatment process for sludge bio-drying can improve the dewatering performance. It was innovatively investigated including the microbial mechanism and the kinetics of moisture removal by bio-drying with electro-dewatered sludge in this study. Two bio-drying processes using electro-dewatered sludge (EDS) and sludge added cornstalk conditioner (CSS) were compared. Microbial community analysis showed that the abundance of Bacteroidetes increased from 4.21% to 16.67% after electro-dewatering. The dominant phyla were Bacteroidetes (36.79%), Proteobacteria (32.35%), and Actinobacteria (24.58%) at the end of EDS bio-drying. Network analysis revealed that the co-occurrence patterns in EDS included 40 nodes and 97 edges. The prediction results of the Kyoto Encyclopedia of Genes and Genomes demonstrated that the relative abundances of carbohydrate metabolism and metabolism of terpenoids and polyketides in sludge decreased, while the relative abundances of lipid metabolism, xenobiotic biodegradation and metabolism increased after electro-dewatering. Five thin layer drying kinetic models were analyzed to estimate the bio-drying kinetic parameters. The Page's model could be better fitted to the results and the highest R2 was 0.9570 in the EDS. The new coefficients k (0.1637) and n (1.2097) were obtained. The results provided mechanism and data support for exploring and applying bio-drying technology after sludge electro-dewatering.
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Affiliation(s)
- Qian Li
- Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, China; School of Environmental Science and Engineering, Tianjin University, Tianjin, 300354, China
| | - Keqiang Zhang
- Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, China
| | - Zengjun Yang
- Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, China
| | - Haigang Guo
- Hebei University of Engineering, Handan, 056038, China
| | - Xiangqun Zheng
- Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, China
| | - Qiangying Zhang
- Department of Chemistry & Environmental Science, School of Science, Tibet University, Lhasa, 850000, China
| | - Jian Xiong
- Department of Chemistry & Environmental Science, School of Science, Tibet University, Lhasa, 850000, China
| | - Xuebin Lu
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300354, China; Department of Chemistry & Environmental Science, School of Science, Tibet University, Lhasa, 850000, China.
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Shangguan H, Fu T, Shen C, Mi H, Wei J, Tang J, Zhou S. In situ generated oxygen distribution causes maturity differentiation during electrolytic oxygen aerobic composting. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 850:157939. [PMID: 35952878 DOI: 10.1016/j.scitotenv.2022.157939] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 08/04/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
Electrolytic oxygen aerobic composting (EOAC) is an effective treatment with greater technical superiority and cost advantages for organic solid waste using in situ electrolytic oxygen as a feasible strategy to replace conventional aeration. However, the unclear effects of distribution and variation of in situ electrolytic oxygen on compost maturation in different depth zones of EOAC need further exploration. This study demonstrated that the humification of organic matter was faster at the bottom than in the middle and at the top. The main reason was that the higher oxygen content and lower moisture content in the bottom promoted microbial degradation and heat production, resulting in higher temperatures. The microbial analysis showed that the abundance of typical thermophilic bacteria (such as Cerasibacillus, Lactobacillus, and Pseudogracilibacillus) that could promote compost maturation was higher at the bottom than in the middle and at the top. The finding provided in-depth molecular insights into differentiated humification from bottom to top in EOAC and revealed its further practical engineering applications.
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Affiliation(s)
- Huayuan Shangguan
- College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tao Fu
- The Key Laboratory of Water and Sediment Sciences (Ministry of Education), College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
| | - Chang Shen
- College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Huan Mi
- College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Junrong Wei
- College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Jiahuan Tang
- College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
| | - Shungui Zhou
- College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
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Han H, Liu Z, Liu H, Qiao J, Chen CLP. Type-2 Fuzzy Broad Learning System. IEEE TRANSACTIONS ON CYBERNETICS 2022; 52:10352-10363. [PMID: 33886485 DOI: 10.1109/tcyb.2021.3070578] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The broad learning system (BLS) has been identified as an important research topic in machine learning. However, the typical BLS suffers from poor robustness for uncertainties because of its characteristic of the deterministic representation. To overcome this problem, a type-2 fuzzy BLS (FBLS) is designed and analyzed in this article. First, a group of interval type-2 fuzzy neurons was used to replace the feature neurons of BLS. Then, the representation of BLS can be improved to obtain good robustness. Second, a fuzzy pseudoinverse learning algorithm was designed to adjust the parameter of type-2 FBLS. Then, the proposed type-2 FBLS was able to maintain the fast computational nature of BLS. Third, a theoretical analysis on the convergence of type-2 FBLS was given to show the computational efficiency. Finally, some benchmark and practical problems were used to test the merits of type-2 FBLS. The experimental results indicated that the proposed type-2 FBLS can achieve outstanding performance.
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Yu B, Chen T, Zheng G, Yang J, Huang X, Fu L, Cai L. Water-heat balance characteristics of the sewage sludge bio-drying process in a full-scale bio-drying plant with circulated air. WASTE MANAGEMENT (NEW YORK, N.Y.) 2022; 141:220-230. [PMID: 35149478 DOI: 10.1016/j.wasman.2022.01.041] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 01/23/2022] [Accepted: 01/31/2022] [Indexed: 06/14/2023]
Abstract
Sewage sludge bio-drying technology has attracted considerable attention in recent years. In this study, we explored the water-heat balance under two ventilation strategies for the first time in bio-drying plants with circulated air, and examined the influence of air circulation on water removal and heat recovery. We want to obtain the relationships of pile temperature, ventilation, and water removal. Then, it provides support for optimizing the bio-drying process conditions and improving the efficiency through analysis of the water-heat relationship. In the low-ventilation and high-ventilation trials, water removed was mainly on Days 9-12 and 1-4, respectively. Ventilation and pile temperature jointly determine the water removed during the bio-drying process. Water balance indicated that more than 30% of the water was removed under the nonventilated process. More organic matter was degraded to maintain a higher pile temperature under low-ventilation than under high-ventilation, which also led to more radiation heat being lost. High-ventilation trial input less energy (3.36 MJ/kg water removed) but obtained a higher bio-drying index I (7.04) and heat utilization efficiency Qeffic (94.1%). Heat balance showed that lower energy consumption by dry air (Qdryair) was obtained due to circulation air with high temperature. Circulation air also has a higher carried capacity of water vapor but carries more water into the pile due to higher humidity.
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Affiliation(s)
- Bao Yu
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tongbin Chen
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guodi Zheng
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Junxing Yang
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Xue Huang
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China; Beijing Greentech Group Co. Ltd., Beijing 100080, China
| | - Lili Fu
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China; Beijing Greentech Group Co. Ltd., Beijing 100080, China
| | - Lu Cai
- School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, China
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11
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How do green and black coffee brews and bioactive interaction with gut microbiome affect its health outcomes? Mining evidence from mechanistic studies, metagenomics and clinical trials. Trends Food Sci Technol 2021. [DOI: 10.1016/j.tifs.2021.11.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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12
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Yang B, Hu D, Liu Y, Lin Z, Zhou X, Pan Q, Zhu H, Pan X. Organic loading on biochemical fractions degradation pattern during food waste bioevaporation. WASTE MANAGEMENT (NEW YORK, N.Y.) 2021; 132:142-150. [PMID: 34332370 DOI: 10.1016/j.wasman.2021.07.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Revised: 06/27/2021] [Accepted: 07/02/2021] [Indexed: 06/13/2023]
Abstract
More food waste (FW) is desired to be treated in a certain processing period, while the degradation pattern of biochemical fractions during FW bioevaporation was significantly influenced by the organic loading (OL). Lower OL facilitated the lipids degradation, while higher OL favored the protein degradation. It was the more porous structure and abundant oxygen accelerated the lipids degradation, and the rapid proliferation of aerobic microorganisms compensated for the low protein degradation in lower OL. Detailly, 76.8% of the lipids was degraded in the trial with OL of 1.04 kg VSFW/kg TSBS (Trial A), but in the trial with OL of 3.16 kg VSFW/kg TSBS (Trial C) it was only 0.5%. For protein, the degradation was different that 17.5% of the protein was degraded in Trial A, whereas 69.1% was degraded in Trial C. Lipids degradation contributed 63.0% to the metabolic heat in Trial A, but its contribution in Trial C was only 0.5%. For protein, it contributed 4.1% to the metabolic heat in Trial A, but in Trial C it accounted for 53.6%. In addition, the degradation of carbohydrates (71.6-80.8%) and their contribution to metabolic heat (32.8-45.9%) were comparable in all trials, thus OL had little effect on carbohydrates degradation. Results from this study could provide important guideline for FW practical disposal during their biological treatment.
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Affiliation(s)
- Benqin Yang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Die Hu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Yanmei Liu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Zhiqiang Lin
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Xiandong Zhou
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Qian Pan
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Hongxu Zhu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Xuejun Pan
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China.
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13
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Zheng G, Yu B, Wang Y, Ma C, Chen T. Fate and biodegradation characteristics of triclocarban in wastewater treatment plants and sewage sludge composting processes and risk assessment after entering the ecological environment. JOURNAL OF HAZARDOUS MATERIALS 2021; 412:125270. [PMID: 33548774 DOI: 10.1016/j.jhazmat.2021.125270] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 01/13/2021] [Accepted: 01/27/2021] [Indexed: 06/12/2023]
Abstract
Triclocarban (TCC) has a high detection frequency in soil, rivers, sediments, and organisms, and its ecological risks have attracted substantial attention. In this study, we analyzed the fate of TCC in four wastewater treatment plants (WWTPs) in Zhengzhou, China, the biodegradation characteristics during the composting process, and the ecological risks of TCC when entering different environmental compartments. The concentration of TCC in the influent was 731.1-812.4 ng/L. More than 53.4% of TCC was biodegraded during the wastewater treatment process, and less than 2.5% was retained in the effluent. TCC was effectively removed through microbial degradation and sewage sludge absorption, and there were only minor differences in the different wastewater treatment processes. It is worth noting that more than 38% of TCC was enriched in sewage sludge (1430.1-1663.8 ng/g). The corresponding biodegradation rates of TCC were 65.7% and 82.8% in sewage sludge after 17 days of composting treatment with sawdust and straw as bulking agents, respectively. The estimated results showed that effluent discharge into the city rivers was safe. Composting could effectively degrade TCC and decrease the ecological risk of TCC when applied to sewage sludge.
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Affiliation(s)
- Guodi Zheng
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Bao Yu
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuewei Wang
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chuang Ma
- Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China
| | - Tongbin Chen
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
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Ma J, Mu L, Zhang Z, Wang Z, Kong W, Feng S, Li A, Shen B, Zhang L. Influence of thermal assistance on the biodegradation of organics during food waste bio-drying: Microbial stimulation and energy assessment. CHEMOSPHERE 2021; 272:129875. [PMID: 33582509 DOI: 10.1016/j.chemosphere.2021.129875] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 01/30/2021] [Accepted: 02/03/2021] [Indexed: 06/12/2023]
Abstract
Recently, bio-drying was highlighted in the drying pretreatment of high-moisture organic wastes for their energy recovery. In this study, to investigate the influences of thermal assistance on microbial stimulation and energy utilization in organic degradation, thermally assisted bio-drying (TB) was conducted on food waste (FW) and was compared with conventional bio-drying (CB) and thermal drying (TD). As expected, more water was removed in TB, which exhibited no lag phenomenon and intensified microbial activity. Corresponding with the stimulated enzyme activity, more readily degradable carbohydrates, lipids and lignocellulose were decomposed in TB than those in CB, and lipid degradation generated a significant proportion of the total bio-heat generated (43.13%-45.83%). Furthermore, according to the microbial analysis (qPCR and 16S rRNA gene sequencing), Bacillus was found to be the dominant genus involved in the degradation of organics during TB and CB. In the initial phase, rather than Weissella, as in CB, Ureibacillus was notable in TB for the degradation of readily degradable substrates. In the late phase, Pseudoxanthomonas and Saccharomonospora were enriched for degrading lignocellulose. In addition, heat balance and life-cycle energy assessment demonstrated that a small amount of thermal heat (11.96%) upgraded bio-drying with high energy efficiency. Compared with the CB and TD processes, the TB trial consumed less thermal energy (0.58 MJ/kg H2O) and achieved a higher energy output/input ratio (3.64). This research suggests that thermal assistance is a promising approach to enhancing FW bio-drying, which exhibits efficient drying performance and great potential for energy recovery.
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Affiliation(s)
- Jiao Ma
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China
| | - Lan Mu
- School of Environmental Science & Technology, Dalian University of Technology, Dalian, 116024, Liaoning, China
| | - Zhikun Zhang
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China
| | - Zhuozhi Wang
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China
| | - Wenwen Kong
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China
| | - Shuo Feng
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China
| | - Aimin Li
- School of Environmental Science & Technology, Dalian University of Technology, Dalian, 116024, Liaoning, China
| | - Boxiong Shen
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China.
| | - Lei Zhang
- School of Environmental Science & Technology, Dalian University of Technology, Dalian, 116024, Liaoning, China.
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15
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Magnetic spent coffee ground as an efficient and green catalyst for aerobic oxidation of alcohols and tandem oxidative Groebke–Blackburn–Bienaymé reaction. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2021. [DOI: 10.1007/s13738-020-02102-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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16
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Guerra-Gorostegi N, González D, Puyuelo B, Ovejero J, Colón J, Gabriel D, Sánchez A, Ponsá S. Biomass fuel production from cellulosic sludge through biodrying: Aeration strategies, quality of end-products, gaseous emissions and techno-economic assessment. WASTE MANAGEMENT (NEW YORK, N.Y.) 2021; 126:487-496. [PMID: 33838388 DOI: 10.1016/j.wasman.2021.03.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 03/22/2021] [Accepted: 03/23/2021] [Indexed: 06/12/2023]
Abstract
This study assesses the technological, environmental and economic feasibility of biodrying to valorise cellulosic sludge as a renewable energy source. Specifically, three different aeration strategies were compared in terms of biodrying performance, energetic consumption, gaseous emissions, quality of end-products and techno-economic analysis. These strategies were based on different combinations of convective drying with biogenic heat produced. Two innovative biodrying performance indicators (Energetic Biodrying Index and Biodrying Performance Index) were proposed to better assess the initial and operational conditions that favour the maximum energy process efficiency and the highest end-product quality. The end-products obtained consistently presented moisture contents below 40% and lower heating values above 9.4 MJ·kg-1. However, the best values achieved were 32.6% and 10.4 MJ·kg-1 for moisture content and lower heating value, respectively. Low N2O and CH4 emissions confirmed the effective aeration of all three strategies carried out, while NH4 and tVOCs were related either to temperature or biological phenomena. A techno-economic analysis proved the economic viability and attractiveness of the biodrying technology for cellulosic sludge in all the strategies applied.
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Affiliation(s)
- N Guerra-Gorostegi
- BETA Technological Center, Science and Technology Faculty, University of Vic-Central University of Catalonia, 08500 Vic, Barcelona, Spain
| | - D González
- Composting Research Group (GICOM), Dept. of Chemical, Biological and Environmental Engineering, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain; Group of Biological Treatment of Liquid and Gaseous Effluents (GENOCOV), Dept. of Chemical, Biological and Environmental Engineering, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - B Puyuelo
- BETA Technological Center, Science and Technology Faculty, University of Vic-Central University of Catalonia, 08500 Vic, Barcelona, Spain
| | - J Ovejero
- BETA Technological Center, Science and Technology Faculty, University of Vic-Central University of Catalonia, 08500 Vic, Barcelona, Spain
| | - J Colón
- BETA Technological Center, Science and Technology Faculty, University of Vic-Central University of Catalonia, 08500 Vic, Barcelona, Spain
| | - D Gabriel
- Group of Biological Treatment of Liquid and Gaseous Effluents (GENOCOV), Dept. of Chemical, Biological and Environmental Engineering, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - A Sánchez
- Composting Research Group (GICOM), Dept. of Chemical, Biological and Environmental Engineering, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - S Ponsá
- BETA Technological Center, Science and Technology Faculty, University of Vic-Central University of Catalonia, 08500 Vic, Barcelona, Spain.
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Wolny-Koładka K, Malinowski M, Zdaniewicz M. Energy-related and microbiological evaluation of the effects of bulking agents on the brewery hot trub biodrying. FOOD AND BIOPRODUCTS PROCESSING 2021. [DOI: 10.1016/j.fbp.2021.04.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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18
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Cao MK, Guo HT, Zheng GD, Chen TB, Cai L. Microbial succession and degradation during kitchen waste biodrying, highlighting the thermophilic phase. BIORESOURCE TECHNOLOGY 2021; 326:124762. [PMID: 33517049 DOI: 10.1016/j.biortech.2021.124762] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 01/17/2021] [Accepted: 01/18/2021] [Indexed: 06/12/2023]
Abstract
Biodrying in conjunction with compound stone amendment was used to treat kitchen waste, which improved biodrying. After 16 days, the pile moisture content decreased from 68.8% to 23.0%. Lignin, cellulose and hemicellulose concentrations decreased from 104.6 mg g-1 d.b., 322.9 mg g-1 d.b. and 155.9 mg g-1 d.b., respectively, to 74.0 mg g-1 d.b., 224.8 mg g-1 d.b. and 134.5 mg g-1 d.b., respectively. The Shannon index for bacteria increased from 2.5 to 3.1, while for fungi, it decreased from 4.6 to 0.6. The relative abundances of Amino Acid Metabolism and Carbohydrate Metabolism exceeded 7%. The thermophilic phase during the process inactivated the pathogenic microorganisms, increased the bacterial diversity, decreased the fungal diversity, and potentially improved the metabolism of nutrients, including amino acids, carbohydrates, lipids and vitamins. The biomarker analysis and predicated protein sequences provide genetic evidence to elucidate why the thermophilic phase is the peak time for nutrient metabolism.
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Affiliation(s)
- Meng-Ke Cao
- School of Civil and Environmental Engineering, Ningbo University, 818 Fenghua Road, Ningbo 315211, China
| | - Han-Tong Guo
- School of Civil and Environmental Engineering, Ningbo University, 818 Fenghua Road, Ningbo 315211, China
| | - Guo-Di Zheng
- Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Tong-Bin Chen
- Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Lu Cai
- School of Civil and Environmental Engineering, Ningbo University, 818 Fenghua Road, Ningbo 315211, China.
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19
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Zhou SP, Zhou HY, Xia SN, Ying JM, Ke X, Zou SP, Xue YP, Zheng YG. Efficient bio-degradation of food waste through improving the microbial community compositions by newly isolated Bacillus strains. BIORESOURCE TECHNOLOGY 2021; 321:124451. [PMID: 33276208 DOI: 10.1016/j.biortech.2020.124451] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 11/21/2020] [Accepted: 11/23/2020] [Indexed: 06/12/2023]
Abstract
This study aims to screen high-degradability strains and develop a novel microbial agent for efficient food waste degradation. The effects of the novel microbial agent on organic matter degradation, enzyme activity, and bacterial succession during the in-situ reduction of food waste were evaluated and compared with other two microbial agents previously developed. Results showed that the novel agent containing four Bacillus strains received maximum organic degradation rates, volatile solid removal (46.91%) and total mass reduction (76.16%). Pyrosequencing analysis revealed that there was a significant difference in the microbial community structure of the matrix among the three biodegradation systems, and the novel agent greatly improved the stability of in-situ reduction process that Bacillus was the dominant genus (>98%) since day 4. These results indicated that the inoculant containing only Bacillus was more stable and cost-effective in FW in-situ reduction.
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Affiliation(s)
- Shi-Peng Zhou
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou 310014, China; Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China
| | - Hai-Yan Zhou
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou 310014, China; Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China
| | - Shu-Ning Xia
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou 310014, China; Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China
| | - Jia-Min Ying
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou 310014, China; Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China
| | - Xia Ke
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou 310014, China; Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China
| | - Shu-Ping Zou
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou 310014, China; Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China
| | - Ya-Ping Xue
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou 310014, China; Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China.
| | - Yu-Guo Zheng
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou 310014, China; Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, China
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20
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Coelho GO, Batista MJ, Ávila AF, Franca AS, Oliveira LS. Development and characterization of biopolymeric films of galactomannans recovered from spent coffee grounds. J FOOD ENG 2021. [DOI: 10.1016/j.jfoodeng.2020.110083] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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21
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Wang K, Wang YY, Chen TB, Zheng GD, Cao MK, Cai L. Adding a recyclable amendment to facilitate sewage sludge biodrying and reduce costs. CHEMOSPHERE 2020; 256:127009. [PMID: 32438127 DOI: 10.1016/j.chemosphere.2020.127009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 04/15/2020] [Accepted: 05/06/2020] [Indexed: 06/11/2023]
Abstract
Finding an economical amendment, available in a steady supply, is needed to support the biodrying industrialization. This research developed a recyclable biodrying amendment (RBA) to condition the biodrying of sewage sludge. The pilot-scale treatment (TR), which included the addition of equivalent weights of RBA and sawdust as amendments, resulted in a higher pile temperature and longer thermophilic phase compared to the control (TC), which used only sawdust as an amendment. The final moisture content levels were below 50% with both TR and TC. The heat use efficiency for water evaporation was 72.2% and 73.0% in TR and TC, respectively. The activity of α-amylase and cellulose 1,4-β-cellobiosidase increased during the thermophilic phase, while the activity of endo-1,4-β-glucanase and endo-1,4-β-xylanase decreased during the thermophilic phase with both TR and TC. The fourier-transform infrared spectra indicated that adding the RBA resulted in good biodegradability of the lipids, proteins, and polysaccharides. The humic acid to fulvic acid ratio in TR and TC increased from 0.33 (TR) and 0.35 (TC) on day 0-0.46 (TR) and 0.45 (TC) on day 21, indicating the humification process. The RBA recovery rate was 95.6% and can be reused. These findings highlight that adding RBA showed satisfactory biodrying performance, reduced the amendment cost, and the biodrying product could be incinerated without energy deficit.
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Affiliation(s)
- Kan Wang
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, China
| | - Yang-Yan Wang
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, China
| | - Tong-Bin Chen
- Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
| | - Guo-Di Zheng
- Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
| | - Meng-Ke Cao
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, China
| | - Lu Cai
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, China.
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22
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Wang X, Chen T, Zheng G. Perlite as the partial substitute for organic bulking agent during sewage sludge composting. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2020; 42:1517-1529. [PMID: 31214844 DOI: 10.1007/s10653-019-00353-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 06/05/2019] [Indexed: 05/09/2023]
Abstract
Composting is an efficient and cost-effective technology for sewage sludge treatment, and bulking agents are essential in sewage sludge composting. In this study, perlite was chosen as inorganic bulking agent to partially substitute for the organic bulking agent. Variations in the temperature, bulk density, moisture content, pH, electrical conductivity, organic carbon, nitrogen, phosphorus and potassium were detected during sewage sludge composting. The treatment with a mass ratio of spent mushroom substrate to perlite at 3:1 exhibited the highest pile temperature and the best effect on reducing bulk density and moisture content. In addition, Fourier transform infrared spectra showed that perlite promotes the degradation of organic matter during the composting process, and the germination index showed that the compost from all treatments was safe for agricultural application. When the mass ratios of spent mushroom substrate and perlite at 3:1 and 2:2 were chosen as bulking agents, the sewage sludge compost product could be used to produce plant cultivation substrate, and economic benefits could be obtained from sewage sludge composting according to comprehensive cost analysis.
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Affiliation(s)
- Xiankai Wang
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Tongbin Chen
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Guodi Zheng
- Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China.
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23
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Pang L, He Y, Liu X, Li J, Yang P. The role of a newly isolated strain Corynebacterium pollutisoli SPH6 in waste activated sludge alkaline fermentation. CHEMOSPHERE 2020; 241:125072. [PMID: 31627109 DOI: 10.1016/j.chemosphere.2019.125072] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2019] [Revised: 09/22/2019] [Accepted: 10/06/2019] [Indexed: 06/10/2023]
Abstract
Alkaline fermentation has been considered as one of the efficient methods for waste activated sludge (WAS) treatment, but usually limited by microbial fermentation activities under extreme pH condition. One newly isolated alkali-tolerant strain Corynebacterium pollutisoli SPH6 was used to assess its potential role and effect on WAS alkaline fermentation process. Results from response surface method showed that the optimal organic nitrogen degradation rate by SPH6 was obtained under temperature of 35 °C, initial pH of 10, shaking speed of 80 rpm, inoculation ratio of 6.5%. Batch-scale experiments demonstrated that, compared with the control group, the inoculation of SPH6 finally achieved higher productions with 13.4% of carbohydrates, 27.1% of protein and 25.4% of total volatile fatty acids (VFAs), and more predominant functional bacteria characterized by high-throughput sequencing, such as genera Acinetobacter in phylum Proteobacteria, Tissierella and Acetoanaerobium in phylum Firmicutes. The strain SPH6 might play a vital role in maintaining and facilitating the growth and diversity of functional bacteria in WAS alkaline fermentation process. It has implied promising practical application of the present strain in enhancing WAS reduction and utilization.
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Affiliation(s)
- Lina Pang
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China
| | - Ye He
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China
| | - Xuna Liu
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China
| | - Junjie Li
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China
| | - Ping Yang
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China.
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24
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Yang B, Li X, Lin Z, Hu D, Liu Y, Pan X. Evolution of enzyme activity, heavy metals bioavailability and microbial community in different temperature stages of the co-bioevaporation process. WASTE MANAGEMENT (NEW YORK, N.Y.) 2020; 102:751-762. [PMID: 31805448 DOI: 10.1016/j.wasman.2019.11.044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2019] [Revised: 11/26/2019] [Accepted: 11/26/2019] [Indexed: 06/10/2023]
Abstract
Laboratory investigations documented enzyme activity, heavy metals' bioavailability and the bacterial community during co-bioevaporation treatment of food waste and landfill leachate. The activities of dehydrogenase, protease, urease and phosphatase were sensitive to the changes in operating temperature inherent in co-bioevaporation. The maximum dehydrogenase activity was appeared at warming 30 °C. The maximum hydrolytic activity of the microorganisms on protein, urea and phosphorus-containing organic compounds appeared at warming 50 °C. The bacteria mainly gathered on the surface and in the pores of the sludge particles used as a bulking agent. Bacterial abundance reached its maximum at warming 50 °C. Firmicutes, Actinobacterica and Proteobacterica were the dominant bacterial phyla involved. Even though co-bioevaporation concentrated the heavy metals in the leachate, their bioavailability was substantially reduced during the process.
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Affiliation(s)
- Benqin Yang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Xukun Li
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Zhiqiang Lin
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Die Hu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Yanmei Liu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Xuejun Pan
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China.
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Aghili SM, Mehrdadi N, Aminzadeh B, Zazouli MA. Using of indigenous bulking agents (IBAs) in complementary stabilization and enhancing of dewatered sludge class B to class a on a full scale. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2019; 17:767-777. [PMID: 32030150 PMCID: PMC6985304 DOI: 10.1007/s40201-019-00393-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Accepted: 07/09/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Different bulking agents are used in the compost of dewatered sludge (DWS). The aim of this study has been using of indigenous bulking agents (IBAs) in the enhancing of the DWS class of municipal wastewater from class B to class A and complementary stabilization of it for production of green manure in Sari city, Iran. METHODS Three IBAs including the Saccharum Wastes (SW), Citrus Purning Wastes (CPW) and Phragmites Australis (PA) from eight IBAs were selected to be compared with the sawdust (SD) that was as a control bulking agent. Five turned windrow piles were constructed on a full scale and on base of optimal C/N equal 25.All experiments were performed on the base of the standard methods on initial mix and final compost. RESULTS Among five windrow piles, P5 was been the best pile with a weighting ratio of DWS to IBAs (DWS: SW: CPW: PA) equal 1: 0.2: 0.24: 0.28. Pile P1 with weighting ratio DWS: SW equal 1: 0.6, Pile P3 with weighting ratio DWS: PA equal 1: 0.84, Pile P2 with weighting ratio DWS: CPW equal 1: 0.73 and Pile P4 with weighting ratio DWS: SD equal 1: 0.57 were placed in the next rounds. The results showed that the class of DWS enhanced to Class A for about 80 to 97 days and complementary stabilization of DWS by IBAs was done well and produced green manure in term of organic matter, potassium, germination index, PH, C/N and electrical conductivity had reached to the Grade 1 of Iran's manure 10716 standard and in term of phosphorus and moisture had reached to the Grade 2 of this standard. Also heavy metals were below the maximum permissible of standards. CONCLUSION Using of IBAs, had a higher efficiency than the control bulking agent (sawdust) in enhancing sludge class and its stabilization, so that using of them in combination (mix of IBAs) had the highest efficiency and respectively, Saccharum Wastes (SW), Phragmites Australis (PA), Citrus pruning wastes (CPW) were placed in the next round, and sawdust was placed after them. By adding suitable IBAS, with an optimal ratio in turned windrow method, the class of DWS of sari WWTP enhanced to Class A and complementary stabilization of DWS has been well done and the produced green manure has been reached to agricultural standards and can be safely used in agriculture.
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Affiliation(s)
- Seyed Mostafa Aghili
- School of Environment, College of Engineering, University of Tehran, Tehran, Iran
| | - Nasser Mehrdadi
- School of Environment, College of Engineering, University of Tehran, Tehran, Iran
| | - Behnoush Aminzadeh
- School of Environment, College of Engineering, University of Tehran, Tehran, Iran
| | - Mohammad Ali Zazouli
- Department of Environmental Health Engineerig, School of Health, Medical Science University of Mazandaran, Sari, Iran
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Ma J, Zhang L, Mu L, Zhu K, Li A. Multivariate insights of bulking agents influence on co-biodrying of sewage sludge and food waste: Process performance, organics degradation and microbial community. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 681:18-27. [PMID: 31102814 DOI: 10.1016/j.scitotenv.2019.05.101] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 05/07/2019] [Accepted: 05/08/2019] [Indexed: 06/09/2023]
Abstract
As a prerequisite additive, bulking agent played an essential role on organic wastes biodrying by affecting the organics degradation and microbial consortia. In this study, a series of experiments were conducted to explore the relationships among the type of bulking agents, organics degradation and microbial community evolution. In line with the excellent physiochemical properties, corncob was found to be more desirable for biodrying with more water removal (62.13% vs. 53.70% for sawdust and 51.72% for straw) and higher energy efficiency. Furthermore, different bulking agents showed different biodegradability and affected co-existed organics degradation. In detail, corncob upgraded the amylase and lipase activities, thus promoting the degradation of readily degradable carbohydrates and lipids in feedstocks, which accounted for >60% of the bio-heat sources for water evaporation. In addition, pyrosequencing analysis revealed that Bacillus (>50%) and Ochrobactrum (>40%) were the dominant genera in thermophilic and cooling phases, with degradation capacities of readily degradable substrate and lignocellulose, respectively. And the pathogens, e.g., E. coli and K. pneumonia, were seriously inhibited by high matrix temperatures in corncob trial. These results not only suggested the corncob was a promising bulking agent, but the potential microbial mechanisms for organics degradation were also revealed.
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Affiliation(s)
- Jiao Ma
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China
| | - Lei Zhang
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China.
| | - Lan Mu
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China
| | - Kongyun Zhu
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China
| | - Aimin Li
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China
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The Possibility of Using Spent Coffee Grounds to Improve Wastewater Treatment Due to Respiration Activity of Microorganisms. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9153155] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Spent coffee ground (SCG) may affect wastewater treatment processes due to high coffee consumption worldwide. The impact of the main chemical compounds present in SCG on respiration activity of sewage sludge was investigated. The results showed approximately two times higher respiration in the samples where various types of SCG were present in comparison with samples without SCG. During intense microbial metabolism, statistically significant (p < 0.05) decreases in caffeine, total polyphenols, and chlorogenic acid contents after processing and in filtrate was observed. The monitored compounds (caffeine, polyphenols, and chlorogenic acid) deteriorated due to their probable inclusion in microbiological metabolism. Increase in respiration activity of microorganisms in the presence of cheap waste material such as coffee grounds can help to improve wastewater treatment. The research was focused on spent coffee grounds’ impact on the respiratory activity of microorganisms in the activated sludge taken from small and large wastewater treatment plants. The impact was measured in more detail due to the inclusion of different coffee species (Robusta and Arabica) in diverse concentrations. The novelty of the study can also be seen through the literature overview, where information cannot be found about SCG influence on the respiration activity of microbial communities, and data on the possible SCG aerobic degradation or utilization by a sewage sludge bacterial consortium has also never been reported. The study has shown the possibility of improving wastewater treatment due to respiration activity of microorganisms in the presence of cheap waste material such as coffee grounds.
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28
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Variations of organic matters and extracellular enzyme activities during biodrying of dewatered sludge with different bulking agents. Biochem Eng J 2019. [DOI: 10.1016/j.bej.2019.04.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Li Q, Zhi S, Yu X, Li Y, Guo H, Yang Z, Zhang S. Biodegradation of volatile solids and water mass balance of bio-drying sewage sludge after electro-dewatering pretreatment. WASTE MANAGEMENT (NEW YORK, N.Y.) 2019; 91:9-19. [PMID: 31203947 DOI: 10.1016/j.wasman.2019.04.051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 04/11/2019] [Accepted: 04/24/2019] [Indexed: 06/09/2023]
Abstract
Using pressurized electro-osmotic dewatering (PEOD) as the pretreatment process for sewage sludge (SS) bio-drying can improve the dewatering performance, but the kinetics of volatile solids biodegradation and the water mass balance are still unknown. These processes were first investigated in this study. Experiments were conducted with three different initial materials, which were composed of SS, bio-dried product and SS dewatered by PEOD (EDSS) as different mass ratios. Six kinetic models and a nonlinear regression method were used to estimate the kinetic parameters, and the models were analyzed using four statistical indicators. Satisfactory fitting of the proposed kinetic model to the experimental data was achieved. Through the water mass balance, the results showed that EDSS had the best dewatering performance for bio-drying. EDSS provided the most appropriate conditions for the bio-drying process; the highest correlation coefficient was 0.9291 and the total water removal rate was 51.13% in the bio-drying of all EDSS.
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Affiliation(s)
- Qian Li
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300354, China
| | - Suli Zhi
- Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
| | - Xiaoyan Yu
- School of Energy and Chemical Engineering, Liaoning Technical University, Hu Ludao 125105, China
| | - Yingte Li
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300354, China
| | - Haigang Guo
- Hebei University of Engineering, Handan 056038, China
| | - Zengjun Yang
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300354, China
| | - Shuting Zhang
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300354, China.
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Ma J, Zhang L, Mu L, Zhu K, Li A. Energetic enhancement of thermal assistance in the cooling stage of biodrying by stimulating microbial degradation. WASTE MANAGEMENT (NEW YORK, N.Y.) 2019; 89:165-176. [PMID: 31079729 DOI: 10.1016/j.wasman.2019.04.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 03/30/2019] [Accepted: 04/01/2019] [Indexed: 06/09/2023]
Abstract
In this study, thermal assistance was employed in the cooling stage of conventional biodrying. The results indicated that thermal assistance greatly enhanced water removal with improved vapor-carrying capacity of air-flow, and rapidly decreased moisture contents (MCs) from 45.15% to 49.42% to 15.20-25.85% in 6 days, which were much lower than those of conventional biodrying (CB, 34.90-40.85%). More importantly, a synergistic enhancement of physical and biological effects was observed in thermally assisted biodrying (TB) in terms of stimulated enzymes activity and microbial metabolism (higher oxygen uptake rate and degradation coefficient k). Among the degraded organics, lignocellulose was noted to be important for bio-heat generation in cooling stages, especially for straw as bulking agent. Heat balance results suggested that small fractions of thermal heat (19.76-24.73%) were required to upgrade CB processes for water evaporation with higher energy efficiency. Based on economic viability analysis and with consideration of the further drying for CB products, thermally assisted biodrying presented more economic benefits with less investment and shorter payback period. This research provided an efficient engineering approach to upgrade the cooling stage of conventional biodrying with low external heat cost.
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Affiliation(s)
- Jiao Ma
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China
| | - Lei Zhang
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China.
| | - Lan Mu
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China
| | - Kongyun Zhu
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China
| | - Aimin Li
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China.
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Wei H, Gao B, Ren J, Li A, Yang H. Coagulation/flocculation in dewatering of sludge: A review. WATER RESEARCH 2018; 143:608-631. [PMID: 30031298 DOI: 10.1016/j.watres.2018.07.029] [Citation(s) in RCA: 243] [Impact Index Per Article: 40.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 07/09/2018] [Accepted: 07/10/2018] [Indexed: 05/03/2023]
Abstract
Sludge disposal is an integral part of wastewater treatment systems, and its cost usually accounts for more than half of the total operation cost. Sludge disposal technology is facing challenges and opportunities simultaneously and can still be improved. Sludge dewatering is an essential process in sludge disposal, and it is important for the effective reduction of the final processing cost. Coagulation/flocculation is a relatively mature, cost-effective, user-friendly sludge dewatering technology. In this work, coagulation/flocculation and their combinations with other pretreatments, including dewatering mechanisms, are reviewed. Various coagulants/flocculants used in sludge dewatering, including inorganic coagulants, organic synthetic and natural polymeric flocculants, and bioflocculants, are introduced in detail because coagulants/flocculants are the key in coagulation/flocculation. The different factors that influence the dewatering performance of these coagulants/flocculants are also presented briefly. Moreover, aiming at the complicated composition of sludge and its treatment difficulty, the prospects and technical developments of coagulation/flocculation in sludge dewatering are discussed.
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Affiliation(s)
- Hua Wei
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China
| | - Boqiang Gao
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China
| | - Jie Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China
| | - Aimin Li
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China
| | - Hu Yang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China.
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Ma J, Zhang L, Mu L, Zhu K, Li A. Thermally assisted bio-drying of food waste: Synergistic enhancement and energetic evaluation. WASTE MANAGEMENT (NEW YORK, N.Y.) 2018; 80:327-338. [PMID: 30455014 DOI: 10.1016/j.wasman.2018.09.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 08/31/2018] [Accepted: 09/12/2018] [Indexed: 06/09/2023]
Abstract
Recently, bio-drying is becoming a promising method to treat the slurry-type food waste together with recovering refused derived fuels (RDFs). In practice, however, conventional process frequently encountered low temperature and inefficient drying performance due to the low microbial activity and organics degradability. In order to improve bio-drying performance, in this study, an externally thermal assistant strategy was proposed to increase water evaporation and stimulate microbial degradability. Based on this idea, a series of experiments were conducted to establish, evaluate and optimize the thermally assisted bio-drying system. It was found that staged heating acclimation was an effective strategy to obtain a superior thermophilic inoculum with high metabolic activity and microbial consortia. In thermally assisted bio-drying process, an extremely high metabolic activity [cumulative OUR, 38.98 mg/(g TS·h)] was obtained, which was greatly higher than that of conventional bio-drying [19.74 mg/(g TS·h)]. Furthermore, thermally assisted bio-drying exhibited a high water-evaporation capacity as thermal drying (157.9 g vs. 147.8 g), which was 3-fold higher than conventional bio-drying. Heat balance calculation indicated that externally supplying a small fraction (12.94%) of thermal energy triggered conventional bio-drying, thus greatly promoting water removal with high energy utilization efficiency as conventional bio-drying (Qevapo 60.30% vs. 64.62%). In addition, the increased air-flow rates greatly accelerated water removal with high bio-energy efficiencies, especially at 0.8 L·min-1·kg-1. The drying effect after 4 days was close to that of 20 days in conventional bio-drying. This research suggests that thermally assisted bio-drying is a promising approach to upgrade conventional bio-drying with high efficiency and low energy cost.
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Affiliation(s)
- Jiao Ma
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China
| | - Lei Zhang
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China.
| | - Lan Mu
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China
| | - Kongyun Zhu
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China
| | - Aimin Li
- School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China.
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