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Wu X, Gao R, Tian X, Hou J, Wang Y, Wang Q, Tang DKH, Yao Y, Zhang X, Wang B, Yang G, Li H, Li R. Co-composting of dewatered sludge and wheat straw with newly isolated Xenophilus azovorans: Carbon dynamics, humification, and driving pathways. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 365:121613. [PMID: 38944964 DOI: 10.1016/j.jenvman.2024.121613] [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: 03/29/2024] [Revised: 05/26/2024] [Accepted: 06/23/2024] [Indexed: 07/02/2024]
Abstract
Composting is a biological reaction caused by microorganisms. Composting efficiency can be adequately increased by adding biochar and/or by inoculating with exogenous microorganisms. In this study, we looked at four methods for dewatered sludge waste (DSW) and wheat straw (WS) aerobic co-composting: T1 (no additive), T2 (5% biochar), T3 (5% of a newly isolated strain, Xenophilus azovorans (XPA)), and T4 (5% of biochar-immobilized XPA (BCI-XPA)). Throughout the course of the 42-day composting period, we looked into the carbon dynamics, humification, microbial community succession, and modifications to the driving pathways. Compared to T1 and T2, the addition of XPA (T3) and BCI-XPA (T4) extended the thermophilic phase of composting without negatively affecting compost maturation. Notably, T4 exhibited a higher seed germination index (132.14%). Different from T1 and T2 treatments, T3 and T4 treatments increased CO2 and CH4 emissions in the composting process, in which the cumulative CO2 emissions increased by 18.61-47.16%, and T3 and T4 treatments also promoted the formation of humic acid. Moreover, T4 treatment with BCI-XPA addition showed relatively higher activities of urease, polyphenol oxidase, and laccase, as well as a higher diversity of microorganisms compared to other processes. The Functional Annotation of Prokaryotic Taxa (FAPROTAX) analysis showed that microorganisms involved in the carbon cycle dominated the entire composting process in all treatments, with chemoheterotrophy and aerobic chemoheterotrophy being the main pathways of organic materials degradation. Moreover, the presence of XPA accelerated the breakdown of organic materials by catabolism of aromatic compounds and intracellular parasite pathways. On the other hand, the xylanolysis pathway was aided in the conversion of organic materials to dissolved organics by the addition of BCI-XPA. These findings indicate that XPA and BCI-XPA have potential as additives to improve the efficiency of dewatered sludge and wheat straw co-composting.
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Affiliation(s)
- Xuan Wu
- College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China
| | - Runyu Gao
- College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China
| | - Xiaorui Tian
- College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China
| | - Jiawei Hou
- College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China
| | - Yang Wang
- College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China
| | - Quan Wang
- College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China
| | - Daniel Kuok Ho Tang
- The University of Arizona (UA), The Department of Environmental Science, Tucson, AZ, 85721, USA; School of Natural Resources and Environment, NWAFU-UA Micro-campus, Yangling, 712100, China
| | - Yiqing Yao
- School of Mechanical & Electronic Engineering, Northwest A&F University, Yangling, 712100, China
| | - Xiu Zhang
- North Minzu University Ningxia Key Laboratory for the Development and Application of Microbial Resources in Extreme Environments, Yinchuan, 750021, China
| | - Bowen Wang
- Shaanxi Livestock and Poultry Breeding Generic Technology Research and Development Platform, Yangling, 712100, China; College of Economics and Management, Northwest A&F University (NWAFU), Yangling, 712100, China; Yangling Animal Husbandry Industry Innovation Center, Yangling, 712100, China; Shaanxi Animal Husbandry Industry Innovation Consortia, Yangling, 712100, China
| | - Guoping Yang
- North Minzu University Ningxia Key Laboratory for the Development and Application of Microbial Resources in Extreme Environments, Yinchuan, 750021, China
| | - Hua Li
- Shaanxi Livestock and Poultry Breeding Generic Technology Research and Development Platform, Yangling, 712100, China; College of Economics and Management, Northwest A&F University (NWAFU), Yangling, 712100, China; Yangling Animal Husbandry Industry Innovation Center, Yangling, 712100, China; Shaanxi Animal Husbandry Industry Innovation Consortia, Yangling, 712100, China.
| | - Ronghua Li
- College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China; The University of Arizona (UA), The Department of Environmental Science, Tucson, AZ, 85721, USA.
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Zhang S, Song C, Wang L, Wang M, Zhang D, Tang G. Exploring the promoting effect of nitrilotriacetic acid on hydroxyl radical and humification during magnetite-amended composting of sewage sludge. BIORESOURCE TECHNOLOGY 2024; 403:130863. [PMID: 38772520 DOI: 10.1016/j.biortech.2024.130863] [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: 03/26/2024] [Revised: 05/17/2024] [Accepted: 05/18/2024] [Indexed: 05/23/2024]
Abstract
The OH production by adding magnetite (MGT) alone has been reported in composting. However, the potential of nitrilotriacetic acid (NTA) addition for magnetite-amended sludge composting remained unclear. Three treatments with different addition [control check (CK); T1: 5 % MGT; T2: 5 % MGT + 5 % NTA] were investigated to characterize hydroxyl radical, humification and bacterial community response. The NTA addition manifested the best performance, with the peak OH content increase by 52 % through facilitating the cycle of Fe(Ⅱ)/Fe(Ⅲ). It led to the highest organic matters degradation (22.3 %) and humic acids content (36.1 g/kg). Furthermore, NTA addition altered bacterial community response, promoting relative abundances of iron-redox related genera, and amino acid metabolism but decreasing carbohydrate metabolism. Structural equation model indicated that temperature and Streptomyces were the primary factors affecting OH content. The study suggests that utilizing chelators is a promising strategy to strengthen humification in sewage sludge composting with adding iron-containing minerals.
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Affiliation(s)
- Shihua Zhang
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China; Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China.
| | - Chunqing Song
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Liujian Wang
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Mingming Wang
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China; Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Dewei Zhang
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China; Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Gang Tang
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China
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Wang N, Yang W, Wang B, Bai X, Wang X, Xu Q. Predicting maturity and identifying key factors in organic waste composting using machine learning models. BIORESOURCE TECHNOLOGY 2024; 400:130663. [PMID: 38583671 DOI: 10.1016/j.biortech.2024.130663] [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: 01/02/2024] [Revised: 03/15/2024] [Accepted: 04/04/2024] [Indexed: 04/09/2024]
Abstract
The measurement of germination index (GI) in composting is a time-consuming and laborious process. This study employed four machine learning (ML) models, namely Random Forest (RF), Artificial Neural Network (ANN), Support Vector Regression (SVR), and Decision Tree (DT), to predict GI based on key composting parameters. The prediction results showed that the coefficient of determination (R2) for RF (>0.9) and ANN (>0.9) was higher than SVR (<0.6) and DT (<0.8), suggesting that RF and ANN displayed superior predictive performance for GI. The SHapley additive exPlanations value result indicated that composting time, temperature, and pH were the important features contributing to GI. Composting time was found to have the most significant impact on GI. Overall, RF and ANN were suggested as effective tools for predicting GI in composting. This study offers the reliable approach of accurately predicting GI in composting processes, thereby enabling intelligent composting practices.
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Affiliation(s)
- Ning Wang
- Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University, Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, China
| | - Wanli Yang
- Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University, Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, China
| | - Bingshu Wang
- School of Software, Northwestern Polytechnical University, Xi'an 710129, China
| | - Xinyue Bai
- Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University, Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, China
| | - Xinwei Wang
- School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Qiyong Xu
- Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University, Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen 518055, China.
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Liang X, Wen X, Yang H, Lu H, Wang A, Liu S, Li Q. Incorporating microbial inoculants to reduce nitrogen loss during sludge composting by suppressing denitrification and promoting ammonia assimilation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 915:170000. [PMID: 38242453 DOI: 10.1016/j.scitotenv.2024.170000] [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: 09/15/2023] [Revised: 12/29/2023] [Accepted: 01/06/2024] [Indexed: 01/21/2024]
Abstract
To address the challenge of increasing nitrogen retention in compost, this study investigated the effects of microbial communities on denitrification and ammonia assimilation during sludge composting by inoculating microbial inoculants. The results showed that the retention rates of total Kjeldahl nitrogen (TKN) and humic acid (HA) in MIs group (with microbial inoculants) were 4.94 % and 18.52 % higher than those in the control group (CK), respectively. Metagenomic analysis showed that Actinobacteria and Proteobacteria were identified as main microorganisms contributing to denitrification and ammonia assimilation. The addition of microbial agents altered the structure of the microbial community, which in turn stimulated the expression of functional genes. During cooling period, the ammonia assimilation genes glnA, gltB and gltD in MIs were 15.98 %, 24.84 % and 32.88 % higher than those in CK, respectively. Canonical correspondence analysis revealed a positive correlation between the dominant bacterial genera from the cooling stage to the maturity stage and the levels of NO3--N, NH4+-N, HA, and TKN contents. NH4+-N was positively correlated with HA, indicating NH4+-N might be incorporated into HA. Heat map and network analyses revealed NH4+-N as a key factor affecting functional genes of denitrification and ammonia assimilation, with Nitrospira identified as the core bacteria in the microbial network. Therefore, the addition of microbial agents could increase nitrogen retention and improve compost product quality.
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Affiliation(s)
- Xueling Liang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Xiaoli Wen
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Hongmei Yang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Heng Lu
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Ao Wang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Shuaipeng Liu
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Qunliang Li
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.
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Chen X, Sun P, Zhuang Z, Ahmed I, Zhang L, Zhang B. Control of odorants in swine manure and food waste co-composting via zero-valent iron /H 2O 2 system. WASTE MANAGEMENT (NEW YORK, N.Y.) 2024; 174:390-399. [PMID: 38103349 DOI: 10.1016/j.wasman.2023.12.018] [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: 07/28/2023] [Revised: 12/08/2023] [Accepted: 12/09/2023] [Indexed: 12/19/2023]
Abstract
Odors have posed challenges to the advancement of aerobic composting. This work aims to identify the primary components responsible for odors and assess the effectiveness and mechanisms of the zero-valent iron/H2O2 system controlling various odorants in aerobic composting. Swine manure and food waste were used as composting materials, with the addition of zero-valent iron and hydrogen peroxide to mitigate odor emissions. Results revealed that odorants included ammonia, hydrogen sulfide, and 22 types of volatile organic compounds (VOCs), with ethyl acetate, heptane, and dimethyl disulfide being predominant. Among the odorants emitted, ammonia accounted for 75.43%, hydrogen sulfide for 0.09%, and identified VOCs for 24.48%. The ZVI/H2O2 system showed a significant reduction in ammonia and VOCs emission, with the reduction of 51% (ammonia) and 41.3% (VOCs) respectively, primarily observed during the thermophilic period. The occurrence of Fenton-like reactions and changes in key microbial populations were the main mechanisms accounting for odor control. The occurrence of Fenton-like reaction was confirmed by X-ray photoelectron spectroscopy and reactive oxygen detection, showing the oxidation of zero-valent iron by H2O2 to higher valence elemental iron, and the simultaneous production of ·OH. Microbial analysis indicated that an enrichment of specific microorganisms with Bacillus contributed to feammonx and Bacillaceae contributed to organic biodegradation. Redundancy analysis highlighted the role of key microbial species (Bacillaceae, Bacillus, and Ureibacillus) in effectively reducing the level of ammonia and volatile organic compounds. These novelty findings illustrated that the potential of this system is promising for controlling the emission of odorants and aerobic composting reinforcement.
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Affiliation(s)
- Xuanbing Chen
- School of Environmental Science and Engineering, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Pengyu Sun
- School of Environmental Science and Engineering, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Zixian Zhuang
- School of Environmental Science and Engineering, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Imtiaz Ahmed
- School of Environmental Science and Engineering, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Lizhi Zhang
- School of Environmental Science and Engineering, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Bo Zhang
- School of Environmental Science and Engineering, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China; State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, Shanghai 200240, China.
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Zhang S, Zhang Q, Gao H, Wang L, Song C, Tang G, Li X, Hu X. Effects of adding steel slag on humification and characteristics of bacterial community during phosphate-amended composting of municipal sludge. BIORESOURCE TECHNOLOGY 2024; 394:130229. [PMID: 38135223 DOI: 10.1016/j.biortech.2023.130229] [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: 10/06/2023] [Revised: 12/17/2023] [Accepted: 12/18/2023] [Indexed: 12/24/2023]
Abstract
This study aimed to investigate the effects of different proportions (0%, 5%, 7.5%, and 10%) of steel slag (SS) on humification and bacterial community characteristics during phosphate-amended composting of municipal sludge. Compared with adding KH2PO4 alone, co-adding SS significantly promoted the temperature, pH, nitrification, and critical enzyme activities (polyphenol oxidase, cellulase, laccase); especially organic matter (OM) degradation rate (25.5%) and humification degree (1.8) were highest in the 5%-SS treatment. Excitation-emission matrix-parallel factor confirmed that co-adding SS could promote the conversion of protein-like substances or microbial by-products into humic-like substances. Furthermore, adding 5%-SS significantly improved the relative abundances of Actinobacteria, Firmicutes and the genes related to carbohydrate and amino acid metabolism, and enhanced the interactions of bacterial community in stability and complexity. The partial least squares path model indicated that OM was the primary factor affecting humification. These results provided a promising strategy to optimize composting of municipal sludge via SS.
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Affiliation(s)
- Shihua Zhang
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China; Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China.
| | - Qicheng Zhang
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China; Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Heyu Gao
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China; Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Liujian Wang
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China; Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Chunqing Song
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China; Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Gang Tang
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China; Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Xiumin Li
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China; Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Xiaobing Hu
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China; Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China
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Yang X, Mazarji M, Li M, Li A, Li R, Zhang Z, Pan J. Mechanism of magnetite-assisted aerobic composting on the nitrogen cycle in pig manure. BIORESOURCE TECHNOLOGY 2024; 391:129985. [PMID: 37931761 DOI: 10.1016/j.biortech.2023.129985] [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: 07/19/2023] [Revised: 10/26/2023] [Accepted: 11/03/2023] [Indexed: 11/08/2023]
Abstract
Magnetite affects nitrogen cycle of pig manure (PM) biostabilisation was investigated. Various doses of magnetite (0 % (T1); 2.5 % (T2); 5 % (T3); 7.5 % (T4)) were homogeneously added into PM and wolfberry branch fillings (BF) mixture for a 50-day composting. Compared to T1, total nitrogen (TN) loss in gaseous form increased remarkably by 17.51 %, 56.31 %, and 24.91 %, respectively, in T2-T4. In particular, T3 dramatically increased the cumulative N2O emission but decreased NH3 emissions. However, T2 and T3 enhanced the total nitrogen contents by 7.24 % and 3.09 %. Structural equation models (SEM) analysis indicated that magnetite addition increased the direct and indirect pathways of N2O emission. Further analysis revealed that Ruminofilibacter and N2O emission were significantly correlated, and Pseudomonas played a vital role in nitrogen preservation. Although using 2 % magnetite as an additive could increase the TN content, the obvious increase of N2O emission should be considered in engineering practice.
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Affiliation(s)
- Xu Yang
- State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Mahmoud Mazarji
- State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Mengtong Li
- State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Aohua Li
- State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Ronghua Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Zengqiang Zhang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Junting Pan
- State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
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Ji Y, Cao Y, Wang Y, Wang C, Qin Z, Cai W, Yang Y, Yan S, Guo X. Effects of adding lignocellulose-degrading microbial agents and biochar on nitrogen metabolism and microbial community succession during pig manure composting. ENVIRONMENTAL RESEARCH 2023; 239:117400. [PMID: 37838195 DOI: 10.1016/j.envres.2023.117400] [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: 08/01/2023] [Revised: 09/27/2023] [Accepted: 10/11/2023] [Indexed: 10/16/2023]
Abstract
This study assessed the influence of the additions of lignocellulose-degrading microbial agents and biochar on nitrogen (N) metabolism and microbial community succession during pig manure composting. Four treatments were established: CK (without additives), M (lignocellulose-degrading microbial agents), BC (biochar), and MBC (lignocellulose-degrading microbial agents and biochar). The results revealed that all treatments with additives decreased N loss compared with CK. In particular, the concentrations of total N and NO3--N were the highest in M, which were 21.87% and 188.67% higher than CK, respectively. Meanwhile, the abundance of denitrifying bacteria Flavobacterium, Enterobacter, and Devosia reduced with additives. The roles of Anseongella (nitrifying bacterium) and Nitrosomonas (ammonia-oxidizing bacterium) in NO3--N transformation were enhanced in M and BC, respectively. N metabolism pathway prediction indicated that lignocellulose-degrading microbial agents addition could enhance N retention effectively mainly by inhibiting denitrification. The addition of biochar enhanced oxidation of NH4+-N to NO2--N and N fixation, as well as inhibited denitrification. These results revealed that the addition of lignocellulose-degrading microbial agents individually was more conducive to improve N retention in pig manure compost.
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Affiliation(s)
- Yahui Ji
- College of Animal Science, Shanxi Agricultural University, Taigu, 030801, Shanxi, China
| | - Yanzhuan Cao
- College of Resources and Environment, Shanxi Agricultural University, Taigu, 030801, Shanxi, China
| | - Yan Wang
- College of Animal Science, Shanxi Agricultural University, Taigu, 030801, Shanxi, China
| | - Chang Wang
- College of Animal Science, Shanxi Agricultural University, Taigu, 030801, Shanxi, China
| | - Zhenghui Qin
- College of Resources and Environment, Shanxi Agricultural University, Taigu, 030801, Shanxi, China
| | - Wenrun Cai
- College of Animal Science, Shanxi Agricultural University, Taigu, 030801, Shanxi, China
| | - Yang Yang
- College of Animal Science, Shanxi Agricultural University, Taigu, 030801, Shanxi, China
| | - Shuangdui Yan
- College of Resources and Environment, Shanxi Agricultural University, Taigu, 030801, Shanxi, China
| | - Xiaohong Guo
- College of Animal Science, Shanxi Agricultural University, Taigu, 030801, Shanxi, China.
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Liu Z, Awasthi MK, Zhao J, Liu G, Syed A, Al-Shwaiman HA, Fang J. Unraveling impacts of inoculating novel microbial agents on nitrogen conversion during cattle manure composting: Core microorganisms and functional genes. BIORESOURCE TECHNOLOGY 2023; 390:129887. [PMID: 37858800 DOI: 10.1016/j.biortech.2023.129887] [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: 09/11/2023] [Revised: 10/16/2023] [Accepted: 10/16/2023] [Indexed: 10/21/2023]
Abstract
The impacts of microbial agents on nitrogen conversion during composting is still not entirely clear. In this research, a novel microbial agent containing two thermotolerant nitrifying bacteria was identified and its impacts on nitrogen conversion, bacterial structure and functional genes during cattle manure composting were investigated. The results revealed that the inoculation enhancing the maturation of compost, increased the total nitrogen by 13.6-26.8%, reduced NH3 emission and the N2O emission by 24.8-36.1% and 22.7-32.1%, respectively. Particularly, the microbial agents mixed Acinetobacter radioresistens and Bacillus nitratireducens (1:1, treatment group 1) had the best nitrogen preservation effect. Furthermore, the inoculation not only produced diverse diazotroph community but could strength the co-occurrence between core microorganisms to promote nitrogen metabolism. The metagenomic analysis demonstrated that the inoculation decreased the abundance of nitrate reduction gene (nirS, norC, nap and nif), and increased the abundance of hao, thus facilitating nitrification and suppressing NH3 and N2O emission.
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Affiliation(s)
- Zhuangzhuang Liu
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, PR China; Hunan Engineering Laboratory for Pollution Control and Waste Utilization in Swine Production, Changsha 410128, PR Chin
| | - Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China
| | - Jinfeng Zhao
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, PR China; Hunan Engineering Laboratory for Pollution Control and Waste Utilization in Swine Production, Changsha 410128, PR Chin
| | - Gang Liu
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, PR China; Hunan Engineering Laboratory for Pollution Control and Waste Utilization in Swine Production, Changsha 410128, PR Chin
| | - Asad Syed
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh, 11451, Saudi Arabia
| | - Hind A Al-Shwaiman
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh, 11451, Saudi Arabia
| | - Jun Fang
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, PR China; Hunan Engineering Laboratory for Pollution Control and Waste Utilization in Swine Production, Changsha 410128, PR Chin.
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Gao Y, Zhu J, Wang K, Ma Y, Fang J, Liu G. Discovery of a heterotrophic aerobic denitrification Pseudomonas sp. G16 and its unconventional nitrogen metabolic pathway. BIORESOURCE TECHNOLOGY 2023; 387:129670. [PMID: 37591467 DOI: 10.1016/j.biortech.2023.129670] [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: 07/01/2023] [Revised: 08/08/2023] [Accepted: 08/10/2023] [Indexed: 08/19/2023]
Abstract
From the aerobic pond of the farm, the Pseudomonas sp. G16 was screened and isolated, which was confirmed to exhibit heterotrophic nitrification and aerobic denitrification. The removal rates of Ammonia (100 mg/L), nitrate (120 mg/L), and nitrite (100 mg/L) by the strain were 94.13%, 92.62%, and 85.67%, and the nitrogen metabolism pathway of strain G16 was analyzed by whole genome sequencing combined with its nitrification-denitrification intermediate products, it was found that the strain had independent nitrification-denitrification ability and no nitrite accumulation. Under the conditions of carbon source of sodium succinate hexahydrate, C/N ratio of 15, pH of 7.5, temperature of 15 °C, and DO of 210 rpm, strain G16 showed excellent denitrification performance. Strain G16 was prepared into biochar-based immobilized bacterial particles, which successfully improved its nitrogen removal efficiency and stability. Therefore, the application of strain G16 in the field of real wastewater treatment has very necessary research value.
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Affiliation(s)
- Yu Gao
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, China; Hunan Engineering Laboratory for Pollution Control and Waste, Utilization in Swine Production, Changsha 410128, China
| | - Junwen Zhu
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, China; Hunan Engineering Laboratory for Pollution Control and Waste, Utilization in Swine Production, Changsha 410128, China
| | - Keyu Wang
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, China; Hunan Engineering Laboratory for Pollution Control and Waste, Utilization in Swine Production, Changsha 410128, China
| | - Yong Ma
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, China; Hunan Engineering Laboratory for Pollution Control and Waste, Utilization in Swine Production, Changsha 410128, China
| | - Jun Fang
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, China; Hunan Engineering Laboratory for Pollution Control and Waste, Utilization in Swine Production, Changsha 410128, China.
| | - Gang Liu
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, China; Hunan Engineering Laboratory for Pollution Control and Waste, Utilization in Swine Production, Changsha 410128, China
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Liu H, Awasthi MK, Zhang Z, Syed A, Bahkali AH, Sindhu R, Verma M. Microbial dynamics and nitrogen retention during sheep manure composting employing peach shell biochar. BIORESOURCE TECHNOLOGY 2023; 386:129555. [PMID: 37499921 DOI: 10.1016/j.biortech.2023.129555] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 07/23/2023] [Accepted: 07/24/2023] [Indexed: 07/29/2023]
Abstract
In this study, the effects of peach shell biochar (PSB) and microbial agent (EM) amendment on nitrogen conservation and bacterial dynamics during sheep manure (SM) composting were examined. Six treatments were performed including T1 (control with no addition), T2 (EM), T3 (EM + 2.5 %PSB), T4 (EM + 5 %PSB), T5 (EM + 7.5 %PSB), and T6 (EM + 10 %PSB). The results showed that the additives amendment reduced NH3 emissions by 6.12%∼32.88% and N2O emissions by 10.96%∼19.76%, while increased total Kjeldahl nitrogen (TKN) content by 8.15-9.13 g/kg. Meanwhile, Firmicutes were the dominant flora in the thermophilic stages, while Proteobacteria, Actinobacteriota, and Bacteroidota were the dominant flora in the maturation stages. The abundance of Bacteroidota and Actinobacteriota were increased by 17.49%∼32.51% and 2.31%∼12.60%, respectively, which can accelerate the degradable organic materials decomposition. Additionally, redundancy analysis showed that Proteobacteria, Actinobacteriota, and Bacteroidota were positively correlated with NO3--N, TKN, and N2O, but a negative correlation with NH3 and NH4+-N. Finally, results confirmed that (EM + 10 %PSB) additives were more effective to reduce nitrogen loss and improve bacterial dynamics.
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Affiliation(s)
- Hong Liu
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, China
| | - Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, China.
| | - Zengqiang Zhang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, China
| | - Asad Syed
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh 11451, Saudi Arabia
| | - Ali H Bahkali
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh 11451, Saudi Arabia
| | - Raveendran Sindhu
- Department of Food Technology, TKM Institute of Technology, Kollam 691505, Kerala, India
| | - Meenakshi Verma
- University Centre for Research & Development, Department of Chemistry, Chandigarh University, Gharuan, Mohali, India
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