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Cao Q, Zhang W, Yin F, Lian T, Wang S, Zhou T, Wei X, Zhang F, Cao T, Dong H. Lactic acid production with two types of feedstocks from food waste: Effect of inoculum, temperature, micro-oxygen, and initial pH. WASTE MANAGEMENT (NEW YORK, N.Y.) 2024; 185:25-32. [PMID: 38820781 DOI: 10.1016/j.wasman.2024.05.036] [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: 02/19/2024] [Revised: 05/19/2024] [Accepted: 05/22/2024] [Indexed: 06/02/2024]
Abstract
Lactic acid (LA) is an important chemical with broad market applications. To optimize LA production, food waste has been explored as feedstock. Due to the wide variety of food waste types, most current research studies have obtained different conclusions. This study focuses on carbohydrate-rich fruit and vegetable waste (FVW) and lipid-rich kitchen waste (KW), and the effect of inoculum, temperature, micro-oxygen, and initial pH were compared. FVW has a greater potential for LA production than KW. As an inoculum, lactic acid bacteria (LAB) significantly increased the maximum LA concentration (27.6 g/L) by 50.8 % compared with anaerobic sludge (AS). FVW exhibited optimal LA production at 37 °C with micro-oxygen. Adjustment of initial pH from 4 to 8 alleviated the inhibitory effect of accumulated LA, resulting in a 46.2 % increase in maximum LA production in FVW. The expression of functional genes associated with metabolism, genetic information processing, and environmental information processing was higher at 37 °C compared to 50 °C.
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Affiliation(s)
- Qitao Cao
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Wanqin Zhang
- China Huadian Engineering Co.Ltd., Beijing 100160, China
| | - Fubin Yin
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Tianjing Lian
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China; College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
| | - Shunli Wang
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Tanlong Zhou
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Xiaoman Wei
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Fangyu Zhang
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Tiantian Cao
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Hongmin Dong
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
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2
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Hwang O, Emmett B, Andersen D, Howe A, Ro K, Trabue S. Effects of swine manure dilution with lagoon effluent on microbial communities and odor formation in pit recharge systems. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 358:120884. [PMID: 38643622 DOI: 10.1016/j.jenvman.2024.120884] [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: 03/09/2023] [Revised: 03/29/2024] [Accepted: 04/10/2024] [Indexed: 04/23/2024]
Abstract
Pit recharge systems (PRS) control odor by managing organic solids in swine manure. However, there needs to be more understanding of PRS's effect on the microbiome composition and its impact on odor formation. A study was conducted to understand how recharge intervals used in PRS impact manure microbiome and odor formation. Bioreactors dynamically loaded simulated recharge intervals of 14, 10, and 4 days by diluting swine manure with lagoon effluent at varying ratios. Treatment ratios tested included 10:0 (control), 7:3 (typical Korean PRS), 5:5 (enhanced PRS #1), and 2:8 (enhanced PRS #2). Manure microbial membership, chemical concentrations, and odorant concentrations were used to identify the interactions between microbiota, manure, and odor. The initial microbial community structure was controlled by dilution ratio and manure barn source material. Firmicutes and Proteobacteria were the dominant microbial phyla in manure and lagoon effluent, respectively, and significantly decreased or increased with dilution. Key microbial species were Clostridium saudiense in manure and Pseudomonas caeni in lagoon effluent. Percentages of these species declined by 8.9% or increased by 17.6%, respectively, with each unit dilution. Microbial community composition was controlled by both treatment (i.e., manure dilution ratio and barn source material) and environmental factors (i.e., solids and pH). Microbiome composition was correlated with manure odor formation profiles, but this effect was inseparable from environmental factors, which explained over 75% of the variance in odor profiles. Consequently, monitoring solids and pH in recharge waters will significantly impact odor control in PRS.
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Affiliation(s)
- Okhwa Hwang
- National Institute of Animal Science, Rural Development Administration, 1500, Kongjwipatjwi-Ro, Iseo-Myeon, Wanju-Gun, Jeollabuk-Do, 55365, Republic of Korea.
| | - Bryan Emmett
- USDA Agricultural Research Service, National Laboratory for Agriculture and the Environment, 1015 N. University Boulevard, Ames, IA, 50011, United States.
| | - Daniel Andersen
- Department of Agricultural and Biosystems Engineering, 3348 Elings Hall, Iowa State University, Ames, IA, 50011, United States.
| | - Adina Howe
- Department of Agricultural and Biosystems Engineering, 3348 Elings Hall, Iowa State University, Ames, IA, 50011, United States.
| | - Kyoung Ro
- USDA Agricultural Research Service, Coastal Plains Soil, Water, and Plant Research Center, 2611 West Lucas St., Florence, SC, 29501, United States.
| | - Steven Trabue
- USDA Agricultural Research Service, National Laboratory for Agriculture and the Environment, 1015 N. University Boulevard, Ames, IA, 50011, United States.
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Gerunova LK, Gerunov TV, P'yanova LG, Lavrenov AV, Sedanova AV, Delyagina MS, Fedorov YN, Kornienko NV, Kryuchek YO, Tarasenko AA. Butyric acid and prospects for creation of new medicines based on its derivatives: a literature review. J Vet Sci 2024; 25:e23. [PMID: 38568825 PMCID: PMC10990906 DOI: 10.4142/jvs.23230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 01/19/2024] [Accepted: 01/22/2024] [Indexed: 04/05/2024] Open
Abstract
The widespread use of antimicrobials causes antibiotic resistance in bacteria. The use of butyric acid and its derivatives is an alternative tactic. This review summarizes the literature on the role of butyric acid in the body and provides further prospects for the clinical use of its derivatives and delivery methods to the animal body. Thus far, there is evidence confirming the vital role of butyric acid in the body and the effectiveness of its derivatives when used as animal medicines and growth stimulants. Butyric acid salts stimulate immunomodulatory activity by reducing microbial colonization of the intestine and suppressing inflammation. Extraintestinal effects occur against the background of hemoglobinopathy, hypercholesterolemia, insulin resistance, and cerebral ischemia. Butyric acid derivatives inhibit histone deacetylase. Aberrant histone deacetylase activity is associated with the development of certain types of cancer in humans. Feed additives containing butyric acid salts or tributyrin are used widely in animal husbandry. They improve the functional status of the intestine and accelerate animal growth and development. On the other hand, high concentrations of butyric acid stimulate the apoptosis of epithelial cells and disrupt the intestinal barrier function. This review highlights the biological activity and the mechanism of action of butyric acid, its salts, and esters, revealing their role in the treatment of various animal and human diseases. This paper also discussed the possibility of using butyric acid and its derivatives as surface modifiers of enterosorbents to obtain new drugs with bifunctional action.
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Affiliation(s)
- Lyudmila K Gerunova
- Department of Pharmacology and Toxicology, Omsk State Agrarian University named after P. A. Stolypin, Omsk 644008, Russian Federation
| | - Taras V Gerunov
- Department of Pharmacology and Toxicology, Omsk State Agrarian University named after P. A. Stolypin, Omsk 644008, Russian Federation
| | - Lydia G P'yanova
- Department of Materials Science and Physicochemical Research Methods, Center of New Chemical Technologies BIC, Omsk 644040, Russian Federation
| | - Alexander V Lavrenov
- Department of Materials Science and Physicochemical Research Methods, Center of New Chemical Technologies BIC, Omsk 644040, Russian Federation
| | - Anna V Sedanova
- Department of Materials Science and Physicochemical Research Methods, Center of New Chemical Technologies BIC, Omsk 644040, Russian Federation
| | - Maria S Delyagina
- Department of Materials Science and Physicochemical Research Methods, Center of New Chemical Technologies BIC, Omsk 644040, Russian Federation.
| | - Yuri N Fedorov
- Laboratory of Immunology, All-Russian Research and Technological Institute of Biological Industry, pos. Biokombinata, Shchelkovskii Region, Moscow Province 141142, Russian Federation
| | - Natalia V Kornienko
- Department of Materials Science and Physicochemical Research Methods, Center of New Chemical Technologies BIC, Omsk 644040, Russian Federation
| | - Yana O Kryuchek
- Department of Pharmacology and Toxicology, Omsk State Agrarian University named after P. A. Stolypin, Omsk 644008, Russian Federation
| | - Anna A Tarasenko
- Department of Pharmacology and Toxicology, Omsk State Agrarian University named after P. A. Stolypin, Omsk 644008, Russian Federation
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You F, Tang M, Zhang J, Wang D, Fu Q, Zheng J, Ye B, Zhou Y, Li X, Yang Q, Liu X, Duan A, Liu J. Benzethonium chloride affects short chain fatty acids produced from anaerobic fermentation of waste activated sludge: Performance, biodegradation and mechanisms. WATER RESEARCH 2024; 250:121024. [PMID: 38113597 DOI: 10.1016/j.watres.2023.121024] [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: 09/01/2023] [Revised: 11/17/2023] [Accepted: 12/14/2023] [Indexed: 12/21/2023]
Abstract
Benzethonium chloride (BZC) is viewed as a promising disinfectant and widely applied in daily life. While studies related to its effect on waste activated sludge (WAS) anaerobic fermentation (AF) were seldom mentioned before. To understand how BZC affects AF of WAS, production of short chain fatty acids (SCFAs), characteristics of WAS as well as microbial community were evaluated during AF. Results manifested a dose-specific relationship of dosages between BZC and SCFAs and the optimum yield arrived at 2441.01 mg COD/L with the addition of 0.030 g/g TSS BZC. Spectral results and protein secondary structure variation indicated that BZC denatured proteins in the solid phase into smaller proteins or amino acids with unstable structures. It was also found that BZC could stimulate the extracellular polymeric substances secretion and reduce the surface tension of WAS, leading to the enhancement of solubilization. Beside, BZC promoted the hydrolysis stage (increased by 7.09 % to 0.030 g/g TSS BZC), but inhibited acetogenesis and methanogenesis stages (decreased by 6.85 % and 14.75 % to 0.030 g/g TSS BZC). The microbial community was also regulated by BZC to facilitate the enrichment of hydrolytic and acidizing microorganisms (i.e. Firmicutes). All these variations caused by BZC were conducive to the accumulation of SCFAs. The findings contributed to investigating the effect of BZC on AF of WAS and provided a new idea for the future study of AF mechanism.
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Affiliation(s)
- Fengyuan You
- Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), College of Environmental Science and Engineering, Ministry of Education, Changsha 410082, PR China
| | - Mengge Tang
- Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), College of Environmental Science and Engineering, Ministry of Education, Changsha 410082, PR China
| | - Jiamin Zhang
- Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), College of Environmental Science and Engineering, Ministry of Education, Changsha 410082, PR China
| | - Dongbo Wang
- Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), College of Environmental Science and Engineering, Ministry of Education, Changsha 410082, PR China
| | - Qizi Fu
- Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), College of Environmental Science and Engineering, Ministry of Education, Changsha 410082, PR China
| | - Jiangfu Zheng
- Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), College of Environmental Science and Engineering, Ministry of Education, Changsha 410082, PR China
| | - Boqun Ye
- Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), College of Environmental Science and Engineering, Ministry of Education, Changsha 410082, PR China
| | - Yintong Zhou
- Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), College of Environmental Science and Engineering, Ministry of Education, Changsha 410082, PR China
| | - Xiaoming Li
- Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), College of Environmental Science and Engineering, Ministry of Education, Changsha 410082, PR China.
| | - Qi Yang
- Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), College of Environmental Science and Engineering, Ministry of Education, Changsha 410082, PR China
| | - Xuran Liu
- Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), College of Environmental Science and Engineering, Ministry of Education, Changsha 410082, PR China
| | - Abing Duan
- Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), College of Environmental Science and Engineering, Ministry of Education, Changsha 410082, PR China
| | - Junwu Liu
- Hunan Engineering Research Center of Mining Site Pollution Remediation, Changsha 410082, PR China
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5
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Wang Y, Xu W, Cong Q, Wang Y, Wang W, Zhang W, Zhu Z, Dong H. Responses of CH 4, N 2O, and NH 3 emissions to different slurry pH values of 5.5-10.0: Characteristics and mechanisms. ENVIRONMENTAL RESEARCH 2023; 234:116613. [PMID: 37437873 DOI: 10.1016/j.envres.2023.116613] [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: 05/10/2023] [Revised: 06/29/2023] [Accepted: 07/09/2023] [Indexed: 07/14/2023]
Abstract
Animal slurry storage is a significant source of greenhouse gas (GHG) and ammonia (NH3) emissions. pH is a basic but key factor that could pose great influence on gas emissions, but the simultaneous evaluation of its influence on GHG and NH3 emissions and the understanding of its underlying mechanism are not enough. In this work, pH was adjusted between 5.5 and 10.0 by a step of 0.5 unit by adding lactic acid and sodium hydroxide (NaOH) properly and frequently to the stored slurry during a 43-day storage period. The cumulative NH3 emissions were linearly correlated with the slurry pH, with R2 being 0.982. Maintaining the slurry pH at 5.5-6.0 could reduce NH3 emissions by 69.4%-85.1% compared with the non-treated group (CK). The pH ranges for maximum methane (CH4) and nitrous oxide (N2O) emissions were 7.5-8.5 and 6.5-8.5, respectively, and the slurry under pH 7.5-8.5 showed the highest GHG emissions. Acidification to pH 5.5 helped reduce the CH4, N2O, and total GHG emissions by 98.0%, 29.3%, and 81.7%, respectively; while alkalinization to pH 10.0 helped achieve the mitigation effects of 74.1%, 24.9%, and 30.6%, respectively. The Pearson's correlation factor between CH4 and the gene copy of mcrA under different pH values was 0.744 (p < 0.05). Meanwhile, the correlation factors between N2O and the gene copies of amoA, narG, and nirS were 0.644 (p < 0.05), 0.719 (p < 0.05), and 0.576 (p = 0.081), respectively. The gene copies of mcrA, amoA, narG, and nirS were maintained at the lowest level under pH 5.5. These results recommended keeping slurry pH lower than 5.5 with lactic acid can help control GHG and NH3 emissions simultaneously and effectively.
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Affiliation(s)
- Yue Wang
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
| | - Wenqian Xu
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
| | - Qunxin Cong
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
| | - Youxu Wang
- College of Bioscience and Resources Environment, Beijing University of Agriculture, Beijing 102208, China.
| | - Wenzan Wang
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
| | - Wanqin Zhang
- China Huadian Engineering Co.Ltd., Beijing 100160, China.
| | - Zhiping Zhu
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
| | - Hongmin Dong
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
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6
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Cao Q, Zhang W, Lian T, Wang S, Yin F, Zhou T, Wei X, Dong H. Revealing mechanism of micro-aeration for enhancing volatile fatty acids production from swine manure. BIORESOURCE TECHNOLOGY 2022; 365:128140. [PMID: 36252761 DOI: 10.1016/j.biortech.2022.128140] [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: 08/06/2022] [Revised: 10/10/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
Micro-aeration is considered a new strategy for improving volatile fatty acids (VFAs) production of agricultural waste. This study investigated the effect and mechanism of micro-aeration of air and oxygen (O2) on VFAs production from swine manure. The results showed that Air-micro-aeration had the most significant improvement effect, with the highest VFAs of 8.21 g/L, which was increased by 22.4%. Moreover, the mixing effects of different micro-aeration were limited, and the microbial communities significantly varied. Firmicutes and Bacteroidota were the dominant hydrolytic and acidogenic bacteria, and Air-micro-aeration preferentially promoted electron transfer activity and energy generation. Methanosarcina, Methanocorpusculum, and Methanobrevibacter can adapt to environmental changes according to their different oxygen tolerance, and the consumption and conversion of VFAs by methanogens were slow under Air-micro-aeration condition. This study revealed mechanism of micro-aeration for improving VFAs production from swine manure, providing a theoretical basis for micro-aeration regulation optimization.
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Affiliation(s)
- Qitao Cao
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Wanqin Zhang
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Tianjing Lian
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China; College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, PR China
| | - Shunli Wang
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Fubin Yin
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Tanlong Zhou
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Xiaoman Wei
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Hongmin Dong
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China.
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7
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Yin F, Dong H, Zhang W, Wang S, Cao Q, Lian T. Antibiotic removal potential for low greenhouse gas emission process of anaerobic digestion (AD) producing volatile fatty acids (VFAs). BIORESOURCE TECHNOLOGY 2022; 360:127540. [PMID: 35777636 DOI: 10.1016/j.biortech.2022.127540] [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: 05/17/2022] [Revised: 06/24/2022] [Accepted: 06/26/2022] [Indexed: 06/15/2023]
Abstract
This study aimed to investigate the antibiotic of sulfachloropyridazine (SCP) reduction and its effects on volatile fatty acids (VFAs) accumulation and microbial community structures during the process of anaerobic digestion (AD) producing VFA. Results showed that initial SCP concentrations have a positive correlation with reduction of SCP and accumulation of VFAs. The removal rates of SCP were 22.21%, 30.00%, 39.31% and 42.59% and the maximum production of VFAs were 3947, 6180, 6462 and 6032 mg/L for initial SCP concentrations of 25, 50, 75 and 100 mg/kg·TS, respectively. SCP only altered bacterial composition by hastening growth of specific bacterial taxa, but didn't increase bacterial α-diversity.
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Affiliation(s)
- Fubin Yin
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, 12 Southern Street of Zhongguancun, Beijing 100081, PR China
| | - Hongmin Dong
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, 12 Southern Street of Zhongguancun, Beijing 100081, PR China.
| | - Wanqin Zhang
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, 12 Southern Street of Zhongguancun, Beijing 100081, PR China
| | - Shunli Wang
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, 12 Southern Street of Zhongguancun, Beijing 100081, PR China
| | - Qitao Cao
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, 12 Southern Street of Zhongguancun, Beijing 100081, PR China
| | - Tianjing Lian
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, 12 Southern Street of Zhongguancun, Beijing 100081, PR China
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8
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Continuous Production of Volatile Fatty Acids (VFAs) from Swine Manure: Determination of Process Conditions, VFAs Composition Distribution and Fermentation Broth Availability Analysis. WATER 2022. [DOI: 10.3390/w14121935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
For pollution control and waste utilization, a promising future direction is to obtain high-value carbon sources from organic waste. In this experiment, swine manure was efficiently converted into high concentration volatile fatty acids through continuous hydrolysis-acidification bioreactors. This study determined the process conditions, the composition distribution of volatile fatty acids and the availability of fermentation broth. The results showed that the reactor with a hydraulic retention time of 1.5 days had the optimal production performance of volatile fatty acids. The highest hydrolysis degree (62.2%) and acidification degree (42.5%) were realized in this reactor at the influent soluble chemical oxygen demand of 5460 mg/L. Furthermore, when the influent soluble chemical oxygen demand was 7660 mg/L, volatile fatty acids of 6065 mg-COD/L could be produced stably, and the proportion of volatile fatty acids in soluble chemical oxygen demand was the largest (75%). Additionally, the fermentation broth rich in volatile fatty acids could be applied to deep nitrogen and phosphorus removal. This work provides a productive approach to resource recovery from swine manure.
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9
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Cao Q, Zhang W, Lian T, Wang S, Yin F, Zhou T, Zhang H, Zhu J, Dong H. Roles of micro-aeration on enhancing volatile fatty acids and lactic acid production from agricultural wastes. BIORESOURCE TECHNOLOGY 2022; 347:126656. [PMID: 34974096 DOI: 10.1016/j.biortech.2021.126656] [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: 11/03/2021] [Revised: 12/26/2021] [Accepted: 12/27/2021] [Indexed: 06/14/2023]
Abstract
Micro-aeration was proven to be an environmentally friendly strategy for efficiently enhancing volatile fatty acids (VFAs) and lactic acid (LA) production. The roles of micro-aeration on mono-digestion of swine manure (SM) for VFAs production and co-digestion of SM with corn silage (CS) for LA production were investigated, respectively. In this study, micro-aeration increased the maximum VFAs concentration by 20.3% to 35.71 g COD/L, and shortened the time to reach the maximum from 18 days to 10 days. Micro-aeration limited the conversion of LA into VFAs, leading to LA accumulation effectively to be 26.08 g COD/L. Microbial community analysis suggested that Clostridium and Terrisporobacter were always the dominant bacteria with or without micro-aeration for VFAs production, but the relative abundance increased notably during the same period. However, Bifidobacterium, which could use the higher productivity metabolism pathway, i.e., Bifidum pathway to produce LA, increased from lower than 1% to 22.9% by micro-aeration.
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Affiliation(s)
- Qitao Cao
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Wanqin Zhang
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Tianjing Lian
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Shunli Wang
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Fubin Yin
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Tanlong Zhou
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Haiyan Zhang
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Jun Zhu
- Department of Biological and Agricultural Engineering, University of Arkansas, Fayetteville, AR 72701, USA
| | - Hongmin Dong
- Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China.
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10
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Li X, Sui K, Zhang J, Liu X, Xu Q, Wang D, Yang Q. Revealing the mechanisms of rhamnolipid enhanced hydrogen production from dark fermentation of waste activated sludge. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150347. [PMID: 34563898 DOI: 10.1016/j.scitotenv.2021.150347] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 09/07/2021] [Accepted: 09/10/2021] [Indexed: 06/13/2023]
Abstract
Rhamnolipid (RL), as an environmentally compatible biosurfactant, has been used to enhance waste activated sludge (WAS) fermentation. However, the effect of RL on hydrogen accumulation in anaerobic fermentation remains unclear. Therefore, this work targets to investigate the mechanism of RL-based dark fermentation system on hydrogen production of WAS. It was found that the maximum yield of hydrogen increased from 1.76 ± 0.26 to 11.01 ± 0.30 mL/g VSS (volatile suspended solids), when RL concentration increased from 0 to 0.10 g/g TSS (total suspended solids). Further enhancement of RL level to 0.12 g/g TSS slightly reduced the production to 10.80 ± 0.28 mL/g VSS. Experimental findings revealed that although RL could be degraded to generate hydrogen, it did not play a major role in enhancing hydrogen accumulation. Mechanism analysis suggested that RL decreased the surface tension between sludge liquid and hydrophobic compounds, thus accelerating the solubilization of WAS, improving the proportion of biodegradable substances which could be used for subsequent hydrogen production. Regardless of the fact that adding RL suppressed all the fermentation processes, the inhibition effect of processes associated with hydrogen consumption was much severer than that of hydrogen production. Further investigations of microbial community revealed that RL enriched the relative abundance of hydrogen producers e.g., Romboutsia but reduced that of hydrogen consumers like Desulfobulbus and Caldisericum.
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Affiliation(s)
- Xiaoming Li
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
| | - Kexin Sui
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Jiamin Zhang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Xuran Liu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Qiuxiang Xu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
| | - Dongbo Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Qi Yang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
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