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Obtainment of lignocellulose degradation microbial community: the effect of acid–base combination after restrictive enrichment. Arch Microbiol 2022; 204:683. [DOI: 10.1007/s00203-022-03195-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 08/14/2022] [Accepted: 08/17/2022] [Indexed: 11/06/2022]
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2
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Hua B, Cai Y, Cui Z, Wang X. Bioaugmentation with methanogens cultured in a micro-aerobic microbial community for overloaded anaerobic digestion recovery. Anaerobe 2022; 76:102603. [PMID: 35709936 DOI: 10.1016/j.anaerobe.2022.102603] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 06/03/2022] [Accepted: 06/06/2022] [Indexed: 11/15/2022]
Abstract
Anaerobic digestion (AD) is widely used for conversion of waste materials into biogas, but inhibition of methane production caused by overloading can be a major problem. The micro-aerobic microbial community MC1 was used to successfully culture methanogens, Methanosarcina acetivorans C2A and Methanosaeta thermophila NBRC 101360. The maximum 16S rRNA gene concentrations of Methanosarcina acetivorans C2A and Methanosaeta thermophila NBRC101360 were 1.06 × 106 and 1.35 × 103 copies/mL, respectively. The five key bacteria in MC1 were quantified to assess the effect of inoculation on the abundances of the bacteria in the mixed culture. The original MC1 total 16S rRNA gene concentration was 1.93 × 108 copies/mL, and the total 16S rRNA gene concentration had increased to 4.79 × 109 copies/mL on day 9 (p < 0.05). The proportions of the key strains in MC1+MST had changed by day 9. Cells were harvested and used to bioaugment and increase the pH values of the high- and medium-temperature anaerobic systems. After bioaugmentation, thermophilic AD recovered well. The cumulative amounts of gas produced were 44.78% and 28.28% higher in the MC1+MST and MC1 groups, respectively, than the sterilized control. The MC1+MST group gave better results than the chemical addition control group (CaCO3). There was no clear effect of bioaugmentation in mesophilic AD. When compared with traditional pure culture of methanogens as inoculants, methanogen cultivation in MC1 was simple and there was no need to separate and purify the target strains. This simplified methanogenic bioaugmentation agent was useful to study the mechanism of bioaugmentation for the recovery from low pH inhibition, showing the potential for practical application.
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Affiliation(s)
- Binbin Hua
- National & Local Joint Engineering Research Center on Biomass Resource Utilization, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Yafan Cai
- School of Chemical Engineering, Zhengzhou University, Kexue Dadao 100, 450001, Zhengzhou, China
| | - Zongjun Cui
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193, PR China
| | - Xiaofen Wang
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193, PR China.
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3
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Wang Y, Zhao C, Zhang D, Zhao M, Peng M, Guo P, Cui Z. Microbial Degradation of Zearalenone by a Novel Microbial Consortium, NZDC-6, and Its Application on Contaminated Corncob by Semisolid Fermentation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:1634-1644. [PMID: 31961687 DOI: 10.1021/acs.jafc.9b05343] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A novel microbial consortium (NZDC-6) was screened and characterized to detoxify the estrogenic mycotoxin zearalenone (ZEA), which commonly contaminates maize and is a major threat to food and health security. We found NZDC-6 to be thermophilic and highly effective, with a 90.3% ZEA degradation ratio at an optimum temperature of 60 °C. NZDC-6 was also effective at degrading the more estrogenic ZEA cognates, α-zearalenol (α-ZAL) and β-zearalenol (β-ZAL), with >90% degradation ratios. To evaluate a practical application, ZEA-contaminated corncobs were treated with NZDC-6 via semisolid fermentation. Measurements of physicochemical parameters and 16S microbial diversity and redundancy analysis (RDA) indicated that ZEA removal was most efficient at a low corncob solid content (< 5%), as a high solid content overwhelmed the microbial metabolic load, leading to increased dissolved oxygen and lowered pH. Our results demonstrate that the control of environmental variables is crucial for effective ZEA microbial removal in practical applications.
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Affiliation(s)
- Yi Wang
- Institute of Agricultural Products Processing and Nuclear Agriculture Technology Research , Hubei Academy of Agricultural Sciences , Wuhan 430064 , China
| | - Chunxia Zhao
- Institute of Agricultural Products Processing and Nuclear Agriculture Technology Research , Hubei Academy of Agricultural Sciences , Wuhan 430064 , China
| | - Dongdong Zhang
- Institute of Marine Biology, Ocean College , Zhejiang University , Zhoushan , Zhejiang 316021, China
| | - Mingming Zhao
- Institute of Agricultural Products Processing and Nuclear Agriculture Technology Research , Hubei Academy of Agricultural Sciences , Wuhan 430064 , China
| | - Maomin Peng
- Institute of Agricultural Products Processing and Nuclear Agriculture Technology Research , Hubei Academy of Agricultural Sciences , Wuhan 430064 , China
| | - Peng Guo
- Institute of Agricultural Products Processing and Nuclear Agriculture Technology Research , Hubei Academy of Agricultural Sciences , Wuhan 430064 , China
| | - Zongjun Cui
- College of Agronomy and Biotechnology , China Agricultural University , Beijing 100193 , China
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Hua B, Dai J, Liu B, Zhang H, Yuan X, Wang X, Cui Z. Pretreatment of non-sterile, rotted silage maize straw by the microbial community MC1 increases biogas production. BIORESOURCE TECHNOLOGY 2016; 216:699-705. [PMID: 27289062 DOI: 10.1016/j.biortech.2016.06.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2016] [Revised: 05/31/2016] [Accepted: 06/01/2016] [Indexed: 06/06/2023]
Abstract
Using microbial community MC1 to pretreat lignocellulosic materials increased the yield of biogas production, and the substrate did not need to be sterilized, lowering the cost. Rotted silage maize straw carries many microbes. To determine whether such contamination affects MC1, rotted silage maize straw was pretreated with MC1 prior to biogas production. The decreases in the weights of unsterilized and sterilized rotted silage maize straw were similar, as were their carboxymethyl cellulase activities. After 5d pretreatment, denaturing gradient gel electrophoresis and quantitative polymerase chain reaction results indicated that the proportions of five key strains in MC1 were the same in the unsterilized and sterilized groups; thus, MC1 was resistant to microbial contamination. However, its resistance to contamination decreased as the degradation time increased. Following pretreatment, volatile fatty acids, especially acetic acid, were detected, and MC1 enhanced biogas yields by 74.7% compared with the untreated group.
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Affiliation(s)
- Binbin Hua
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, PR China
| | - Jiali Dai
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, PR China
| | - Bin Liu
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, PR China
| | - Huan Zhang
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, PR China
| | - Xufeng Yuan
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, PR China
| | - Xiaofen Wang
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, PR China.
| | - Zongjun Cui
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, PR China
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5
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Yuan X, Ma L, Wen B, Zhou D, Kuang M, Yang W, Cui Z. Enhancing anaerobic digestion of cotton stalk by pretreatment with a microbial consortium (MC1). BIORESOURCE TECHNOLOGY 2016; 207:293-301. [PMID: 26896713 DOI: 10.1016/j.biortech.2016.02.037] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 02/06/2016] [Accepted: 02/09/2016] [Indexed: 05/25/2023]
Abstract
Microbial pretreatment is beneficial in some anaerobic digestion systems, but the consortia used to date have not been able to effectively increase methane production from cotton stalk. In this study, a thermophilic microbial consortium (MC1) was used for pretreatment in order to enhance biogas and methane production yields. The results indicated that the concentrations of soluble chemical oxygen demand and volatile organic products increased significantly in the early stages of pretreatment. Ethanol, acetic acid, propionic acid, and butyric acid were the predominant volatile organic products in the MC1 hydrolysate. Biogas and methane production yields from cotton stalk were significantly increased following MC1 pretreatment. In addition, the methane production rate from the treated cotton stalk was greater than that from the untreated sample.
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Affiliation(s)
- Xufeng Yuan
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Lei Ma
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang 455000, China
| | - Boting Wen
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Dayun Zhou
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang 455000, China
| | - Meng Kuang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang 455000, China
| | - Weihua Yang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang 455000, China
| | - Zongjun Cui
- College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China.
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Wen B, Yuan X, Li QX, Liu J, Ren J, Wang X, Cui Z. Comparison and evaluation of concurrent saccharification and anaerobic digestion of Napier grass after pretreatment by three microbial consortia. BIORESOURCE TECHNOLOGY 2015; 175:102-111. [PMID: 25459810 DOI: 10.1016/j.biortech.2014.10.043] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2014] [Revised: 10/04/2014] [Accepted: 10/09/2014] [Indexed: 06/04/2023]
Abstract
Napier grass is potentially a viable feedstock for biofuel production. The present study investigated biological pretreatment of Napier grass by three microbial consortia followed by saccharification and anaerobic digestion. The pretreatment efficiencies of three microbial consortia were compared in terms of degradation ability, saccharide and biogas yield. The lignocellulose loss rates of Napier grass varied largely. The biomass pretreated by the consortium WSD-5 gave 43.4% and 66.2% total sugar yield under low and moderate loadings of commercial enzyme mixtures, while the highest yield was 83.2% pretreated by the consortium MC1 under a high enzyme loading. The maximum methane yield of pretreated samples by the consortia MC1, WSD-5 and XDC-2 were 259, 279, 247ml/g VS, respectively, which were 1.39, 1.49 and 1.32times greater than the values of the untreated controls. This study showed that pretreatments by MC1, WSD-5 and XDC-2 were capable of significantly enhancing both the saccharide and methane yields from Napier grass.
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Affiliation(s)
- Boting Wen
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI 96822, USA
| | - Xufeng Yuan
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Qing X Li
- Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI 96822, USA
| | - Jingjing Liu
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Jiwei Ren
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
| | - Xiaofen Wang
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China.
| | - Zongjun Cui
- Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China.
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7
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Hu Y, Pang Y, Yuan H, Zou D, Liu Y, Zhu B, Chufo WA, Jaffar M, Li X. Promoting anaerobic biogasification of corn stover through biological pretreatment by liquid fraction of digestate (LFD). BIORESOURCE TECHNOLOGY 2015; 175:167-173. [PMID: 25459818 DOI: 10.1016/j.biortech.2014.10.088] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Revised: 10/13/2014] [Accepted: 10/17/2014] [Indexed: 06/04/2023]
Abstract
A new biological pretreatment method by using liquid fraction of digestate (LFD) was advanced for promoting anaerobic biogasification efficiency of corn stover. 17.6% TS content and ambient temperature was appropriate for pretreatment. The results showed that C/N ratio decreased to about 30, while total lignin, cellulose, and hemicellulose (LCH) contents were reduced by 8.1-19.4% after pretreatment. 3-days pretreatment was considered to be optimal, resulting in 70.4% more biogas production, 66.3% more biomethane yield and 41.7% shorter technical digestion time compared with the untreated stover. The reductions on VS, cellulose, and hemicellulose were increased by 22.1-35.9%, 22.3-35.4%, and 19.8-27.2% for LFD-treated stovers. The promoted anaerobic biogasification efficiency was mainly attributed to the improved biodegradability due to the pre-decomposition role of the bacteria in LFD. The method proved to be an efficient and low cost approach for producing bioenergy from corn stover, meanwhile, reducing LFD discharge and minimizing its potential pollution.
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Affiliation(s)
- Yun Hu
- Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Yunzhi Pang
- Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Hairong Yuan
- Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Dexun Zou
- Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Yanping Liu
- Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Baoning Zhu
- Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Wachemo Akiber Chufo
- Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Muhammad Jaffar
- Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Xiujin Li
- Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.
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8
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Yuan X, Wen B, Ma X, Zhu W, Wang X, Chen S, Cui Z. Enhancing the anaerobic digestion of lignocellulose of municipal solid waste using a microbial pretreatment method. BIORESOURCE TECHNOLOGY 2014; 154:1-9. [PMID: 24365784 DOI: 10.1016/j.biortech.2013.11.090] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Revised: 11/25/2013] [Accepted: 11/28/2013] [Indexed: 06/03/2023]
Abstract
The use of biological pretreatment in anaerobic digestion systems has some potential; however, to date, these methods have not been able to effectively increase methane production of lignocellulose of municipal solid waste (LMSW). In this study a thermophilic microbial consortium (MC1) was used as a pretreatment method in order to enhance biogas and methane production yields. The results indicated that sCOD concentration increased significantly in the early stages of pretreatment. Ethanol, acetic acid, propionic acid, and butyric acid were the predominant volatile organic products in the MC1 hydrolysate. Biogas and methane production yields of LMSW significantly increased following MC1 pretreatment. In addition, the methane production rate of the treated LMSW was greater than that observed from the untreated sample.
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Affiliation(s)
- Xufeng Yuan
- College of Agronomy and Biotechnology, Center of Biomass Engineering, China Agricultural University, Beijing 100193, China
| | - Boting Wen
- College of Agronomy and Biotechnology, Center of Biomass Engineering, China Agricultural University, Beijing 100193, China
| | - Xuguang Ma
- College of Agronomy and Biotechnology, Center of Biomass Engineering, China Agricultural University, Beijing 100193, China
| | - Wanbin Zhu
- College of Agronomy and Biotechnology, Center of Biomass Engineering, China Agricultural University, Beijing 100193, China
| | - Xiaofen Wang
- College of Agronomy and Biotechnology, Center of Biomass Engineering, China Agricultural University, Beijing 100193, China
| | - Shaojiang Chen
- College of Agronomy and Biotechnology, Center of Biomass Engineering, China Agricultural University, Beijing 100193, China
| | - Zongjun Cui
- College of Agronomy and Biotechnology, Center of Biomass Engineering, China Agricultural University, Beijing 100193, China.
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9
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Ma Y, Zhai S, Mao SY, Sun SL, Wang Y, Liu ZH, Dai YJ, Yuan S. Co-metabolic transformation of the neonicotinoid insecticide imidacloprid by the new soil isolate Pseudoxanthomonas indica CGMCC 6648. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2014; 49:661-70. [PMID: 25035915 DOI: 10.1080/03601234.2014.922766] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
A new imidacloprid (IMI) degrading bacterium Z-9 (deposited number CGMCC 6648) was isolated and identified as Pseudoxanthomonas indica by 16S rRNA gene analysis. Two metabolites were identified as olefin and 5-hydroxy IMI by liquid chromatography-mass spectrometry and nuclear magnetic resonance analysis. P. indica CGMCC 6648 degraded 70.1% of IMI (1.22 mmol L(-1)) and formed 0.93 mmol L(-1) 5-hydroxy IMI and 0.05 mmol L(-1) olefin IMI in 6 days and in the presence of 100 mmol L(-1) glucose. The half-life of IMI degradation was 3.6 days. P. indica CGMCC 6648 transforms IMI via a co-metabolism mechanism and different carbohydrates have significant effects on 5-hydroxy IMI formation, whereas different organic acids have substantial effects on olefin IMI production. Lactose is the best co-substrate for IMI degradation and 5-hydroxy IMI formation with 0.77 mmol L(-1) degraded and 0.67 mmol L(-1) formed in 48 h, respectively. Pyruvate is the best co-substrate for olefin IMI formation with 0.17 mmol L(-1) produced in 96 h for all carbon sources tested. Pyruvate significantly stimulates the conversion of 5-hydroxy IMI to olefin IMI, whereas glucose slightly inhibits this reaction. P. indica CGMCC 6648 rapidly degrades IMI and forms olefin IMI, which may enhance its potential for biodegradation of IMI and increase its insecticidal activity, which can decrease the IMI dosage required.
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Affiliation(s)
- Yuan Ma
- a Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Science , Nanjing Normal University , Nanjing , People's Republic of China
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10
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Xiong XQ, Liao HD, Ma JS, Liu XM, Zhang LY, Shi XW, Yang XL, Lu XN, Zhu YH. Isolation of a rice endophytic bacterium, Pantoea
sp. Sd-1, with ligninolytic activity and characterization of its rice straw degradation ability. Lett Appl Microbiol 2013; 58:123-9. [DOI: 10.1111/lam.12163] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Revised: 09/17/2013] [Accepted: 09/17/2013] [Indexed: 11/29/2022]
Affiliation(s)
- X. Q. Xiong
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation; College of Biology; Hunan University; Changsha China
- Guizhou Institute of Upland Crops; Guiyang Guizhou
| | - H. D. Liao
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation; College of Biology; Hunan University; Changsha China
| | - J. S. Ma
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation; College of Biology; Hunan University; Changsha China
| | - X. M. Liu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation; College of Biology; Hunan University; Changsha China
| | - L. Y. Zhang
- Guizhou Institute of Upland Crops; Guiyang Guizhou
| | - X. W. Shi
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation; College of Biology; Hunan University; Changsha China
| | - X. L. Yang
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation; College of Biology; Hunan University; Changsha China
| | - X. N. Lu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation; College of Biology; Hunan University; Changsha China
| | - Y. H. Zhu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation; College of Biology; Hunan University; Changsha China
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11
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Yuan X, Cao Y, Li J, Wen B, Zhu W, Wang X, Cui Z. Effect of pretreatment by a microbial consortium on methane production of waste paper and cardboard. BIORESOURCE TECHNOLOGY 2012; 118:281-288. [PMID: 22705535 DOI: 10.1016/j.biortech.2012.05.058] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2012] [Revised: 05/12/2012] [Accepted: 05/14/2012] [Indexed: 06/01/2023]
Abstract
A microbial consortium MC1 was used to pretreat filter paper, office paper, newspaper, and cardboard to enhance methane production. The results of pretreatment indicated that sCOD of hydrolysates of the four substrates increased significantly in the early stage, and peaked on day 7. During pretreatment, ethanol, acetic acid, propionic acid, butyric acid, and glycerol were the predominant volatile organic products in hydrolysates. MC1 had strong degradation ability on the four substrates, and the weight loss of filter paper, office paper, newspaper, and cardboard reached 78.3%, 80.5%, 39.7%, and 49.7%, respectively. The results of anaerobic digestion showed that methane production yields and rates of the four substrates significantly increased after pretreatment. This study is the first attempt to explore the microbial pretreatment method for anaerobic digestion of waste paper and cardboard. Microbial consortium pretreatment could be an effective method for enhancing methane production of waste paper and cardboard into bioenergy.
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Affiliation(s)
- Xufeng Yuan
- College of Agronomy and Biotechnology/Center of Biomass Engineering, China Agricultural University, Beijing 100193, China
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12
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Guo P, Mochidzuki K, Cheng W, Zhou M, Gao H, Zheng D, Wang X, Cui Z. Effects of different pretreatment strategies on corn stalk acidogenic fermentation using a microbial consortium. BIORESOURCE TECHNOLOGY 2011; 102:7526-7531. [PMID: 21624832 DOI: 10.1016/j.biortech.2011.04.083] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Revised: 04/19/2011] [Accepted: 04/25/2011] [Indexed: 05/30/2023]
Abstract
The effects of sulfuric acid, acetic acid, aqueous ammonia, sodium hydroxide, and steam explosion pretreatments of corn stalk on organic acid production by a microbial consortium, MC1, were determined. Steam explosion resulted in a substrate that was most favorable for microbial growth and organic acid productions. The total amounts of organic acids produced by MC1 on steam exploded, sodium hydroxide, sulfuric acid, acetic acid, and aqueous ammonia pretreated corn stalk were 2.99, 2.74, 1.96, 1.45, and 2.21g/l, respectively after 3days of fermentation at 50°C. The most prominent organic products during fermentation of steam-exploded corn stalks were formic (0.86g/l), acetic (0.59g/l), propanoic (0.27g/l), butanoic (0.62g/l), and lactic acid (0.64g/l) after 3days of fermentation; ethanol (0.18g/l), ethanediol (0.68g/l), and glycerin (3.06g/l) were also produced. These compounds would be suitable substrates for conversion to methane by anaerobic digestion.
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Affiliation(s)
- Peng Guo
- Institute of Agricultural Products Processing and Nuclear Agriculture Technology Research, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
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LIU CL, WANG XF, WANG XJ, LI PP, CUI ZJ. The Character of Normal Temperature Straw-Rotting Microbial Community. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/s1671-2927(09)60147-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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14
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Lv Z, Yang J, Wang E, Yuan H. Characterization of extracellular and substrate-bound cellulases from a mesophilic sugarcane bagasse-degrading microbial community. Process Biochem 2008. [DOI: 10.1016/j.procbio.2008.08.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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15
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Lv Z, Yang J, Yuan H. Production, purification and characterization of an alkaliphilic endo-β-1,4-xylanase from a microbial community EMSD5. Enzyme Microb Technol 2008. [DOI: 10.1016/j.enzmictec.2008.06.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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16
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Guo P, Wang X, Zhu W, Yang H, Cheng X, Cui Z. Degradation of corn stalk by the composite microbial system of MC1. J Environ Sci (China) 2008; 20:109-114. [PMID: 18572532 DOI: 10.1016/s1001-0742(08)60017-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The composite microbial system of MC1 was used to degrade corn stalk in order to determine properties of the degraded products as well as bacterial composition of MC1. Results indicated that the pH of the fermentation broth was typical of lignocellulose degradation by MC1, decreasing in the early phase and increasing in later stages of the degradation. The microbial biomass peaked on the day 3 after degradation. The MC1 efficiently degraded the corn stalk by nearly 70% during which its cellulose content decreased by 71.2%, hemicellulose by 76.5% and lignin by 24.6%. The content of water-soluble carbohydrates (WSC) in the fermentation broth increased progressively during the first three days, and decreased thereafter, suggesting an accumulation of WSC in the early phase of the degradation process. Total levels of various volatile products peaked in the third day after degradation, and 7 types of volatile products were detected in the fermentation broth. These were ethanol, acetic acid, 1,2-ethanediol, propanoic acid, butanoic acid, 3-methyl-butanoic acid and glycerine. Six major compounds were quantitatively analysed and the contents of each compound were ethanol (0.584 g/L), acetic acid (0.735 g/L), 1,2-ethanediol (0.772 g/L), propanoic acid (0.026 g/L), butanoic acid (0.018 g/L) and glycerine (4.203 g/L). Characterization of bacterial cells collected from the culture solution, based on 16S rDNA PCR-DGGE analysis of DNAs, showed that the composition of bacterial community in MC1 coincided basically with observations from previous studies. This indicated that the structure of MC1 is very stable during degradation of different lignocellulose materials.
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Affiliation(s)
- Peng Guo
- College of Agronomy and Biotechnology, China Agricultural University, Key Laboratory of Crop Cultivation and Farming System, Ministry of Agriculture of China, Beijing 100094, China.
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