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Continuous-flow membrane bioreactor enhances enrichment and culture of autotrophic nitrifying bacteria by removing extracellular free organic carbon. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:42378-42389. [PMID: 36648712 DOI: 10.1007/s11356-023-25253-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Accepted: 01/07/2023] [Indexed: 01/18/2023]
Abstract
An activated sludge system can be inoculated with enriched nitrifying bacteria to enhance NH4+-N removal, or enriched nitrifying bacteria can be added directly to a river to remove NH4+-N. However, the enrichment culture is still generally inefficient and the technical bottleneck has not been clarified. Previous studies have shown that extracellular free organic carbon (EFOC) inhibits the growth of some autotrophic bacteria, and separating EFOC during culture with a membrane bioreactor (MBR) promotes the continuous growth of autotrophic bacteria and CO2 fixation. However, whether a membrane bioreactor can also be used to enrich and culture autotrophic nitrifying bacteria by separating EFOC has not been verified. In this study, an MBR was constructed to separate EFOC during the culture of nitrifying bacteria in activated sludge to confirm that the MBR better enriches and cultures nitrifying bacteria than a sequencing batch reactor (SBR). Our results showed that after culture for 34 days, the rate of NH4+-N removal and the nitrification rate by nitrifying bacteria in the MBR were 2.20-fold and 1.42-fold higher than in the SBR, respectively. The abundance of Nitrospira in the MBR was also 7.23-fold greater than in the SBR at the end of the experimental period. After 34 days, the average concentration of EFOC and the average EFOC/bacterial organic carbon ratio in the MBR were only 53% and 37% of those in the SBR, respectively. A correlation analysis suggested that the timely removal by the MBR of the EFOC generated during the culture process may be an important factor in promoting the growth of autotrophic nitrifying bacteria. The possible mechanism by which the MBR separates EFOC to the growth of promote autotrophic nitrifying bacteria is discussed from the perspective of the inhibitory effect of EFOC on cbb gene transcription. Our experimental results suggest a new approach to enhancing the enrichment of autotrophic nitrifying bacteria and extending the application of MBRs.
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Guo J, Wang XY, Li T, Gao MT, Hu J, Li J. Effect of micro-nanobubbles with different gas sources on the growth and metabolism of chemoautotrophic microorganisms. Process Biochem 2022. [DOI: 10.1016/j.procbio.2022.12.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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3
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Hu J, Tang H, Wang YZ, Yang C, Gao MT, Tsang YF, Li J. Effect of dissolved solids released from biochar on soil microbial metabolism. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2022; 24:598-608. [PMID: 35332912 DOI: 10.1039/d2em00036a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Dissolved solids released from biochar (DSRB), including organic and inorganic compounds, may affect the role of biochar as a soil amendment. In this study, the effects of DSRB on soil microbe metabolism, especially CO2 fixation, were evaluated in liquid soil extract. DSRB were found to be released in large amounts (289.05 mg L-1 at 1 hour) from biochar over a short period of time before their rate of release slowed to a gradual pace. They increased the microbial biomass and provided energy and reducing power to microbes, while reducing their metabolic output of extracellular proteins and polysaccharides. DSRB inputs led to the redistribution of metabolic flux in soil microorganisms and an increased organic carbon content in the short term. This content gradually decreased as it was utilized. DSRB did not improve microbial CO2 fixation but, rather, enhanced its release, while promoting specific soil microorganism genera, including Cupriavidus, Flavisolibacter, and Pseudoxanthomonas. These heterotrophic genera may compete with autotrophic microorganisms for nutrients but have positive synergistic relationships with autotrophs during CO2 fixation. These results demonstrated that reducing the DSRB in biochar can improve its role as a soil amendment by enhancing soil carbon storage and CO2 fixation capabilities.
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Affiliation(s)
- Jiajun Hu
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China.
| | - Han Tang
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China.
| | - Ya Zhu Wang
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China.
| | - Chen Yang
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China.
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Min-Tian Gao
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China.
| | - Yiu Fai Tsang
- Department of Science and Environmental Studies, The Education University of Hong Kong, Hong Kong, China
| | - Jixiang Li
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
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4
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Wu S, Xi X, Fu X, Hu JJ, Zhang S, Wang L. Mixed electron donors synergistically enhance CO 2 fixation of non-photosynthetic microorganism communities through optimizing community structure to promote cbb gene transcription. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:16368-16379. [PMID: 33387320 DOI: 10.1007/s11356-020-12201-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 12/22/2020] [Indexed: 06/12/2023]
Abstract
Studies have shown that mixed electron donors (MEDs) can enhance the CO2-fixing efficiency of non-photosynthetic microbial communities (NPMCs), even up to the level of fixation observed when H2 is used as an electron donor. However, this promotion effect is not stable because its mechanism remains unclear. To elucidate the mechanisms involved, allowing further regulation and optimization of the MED system for improving the CO2-fixing efficiency of NPMCs consistently, cbb gene transcription level and efficiency, extracellular free organic carbon (EFOC) content as well as microbial structure of NPMCs under MED and other electron donor systems were investigated. MEDs synergistically promoted CO2 fixation efficiency of NPMCs, even producing levels seen when H2 was used as the electron donor. Subsequent experiments revealed that the cbb gene abundance and transcription level in the MED system were high compared with those in other single-electron donor systems; the concentration of EFOC per unit cell was relatively lower than that in any other electron donor system; and the system developed a large number of dominant heterotrophic bacteria such as Enterobacteriaceae and Vibrionaceae. Data analysis revealed a high negative correlation between EFOC concentration per unit cell and cbb gene abundance as well as gene transcription level. These results implied that MEDs can promote a complex microbial community structure enriched with high-efficiency heterotrophic bacteria, which can effectively reduce excessive EFOC generated by NPMCs in the CO2 fixation process, promoting overall cbb gene abundance and transcription level within the NPMC and thus enhancing CO2 fixation.
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Affiliation(s)
- Song Wu
- Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
- Research Institute for Shanghai Pollution Control and Ecological Security, Shanghai, 200092, China
| | - Xuefei Xi
- Shanghai Academy of Environmental Sciences, Shanghai, 200032, China
| | - Xiaohua Fu
- Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
- Research Institute for Shanghai Pollution Control and Ecological Security, Shanghai, 200092, China
| | - Jia-Jun Hu
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai, 200444, China
| | - Saiwei Zhang
- Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
- Research Institute for Shanghai Pollution Control and Ecological Security, Shanghai, 200092, China
| | - Lei Wang
- Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
- Research Institute for Shanghai Pollution Control and Ecological Security, Shanghai, 200092, China.
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5
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Zhang S, Wang L, Fu X, Tsang YF, Maiti K. A continuous flow membrane bio-reactor releases the feedback inhibition of self-generated free organic carbon on cbb gene transcription of a typical chemoautotrophic bacterium to improve its CO 2 fixation efficiency. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 761:143186. [PMID: 33131832 DOI: 10.1016/j.scitotenv.2020.143186] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 09/25/2020] [Accepted: 10/06/2020] [Indexed: 06/11/2023]
Abstract
Since the free organic carbon (FOC) generated by chemoautotrophic bacterium self has a feedback inhibition effect on its growth and carbon fixation, a continuous flow membrane bio-reactor was designed to remove extracellular FOC (EFOC) and release its inhibition effect. The promotion effect of membrane reactor on growth and carbon fixation of typical chemoautotrophic bacterium and its mechanism were studied. The accumulated apparent carbon fixation yield in membrane reactor was 3.24 times that in the control reactor. The EFOC per unit bacteria and cbb gene transcription level in membrane reactor were about 0.41 times and 11.18 times that in control reactor in late stage, respectively. Membrane reactor separated out EFOC, especially the small molecules, which facilitated the release of intracellular FOC, thereby releasing the inhibition of FOC on cbb gene transcription, thus promoting growth and carbon fixation of the typical chemoautotrophic bacterium. This study lays a foundation for enhancing carbon fixation by chemoautotrophic bacteria and expands the application field of membrane reactor.
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Affiliation(s)
- Saiwei Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, China; Department of Oceanography and Coastal Sciences, College of the Coast and Environment, Louisiana State University, Baton Rouge, LA, USA
| | - Lei Wang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, China.
| | - Xiaohua Fu
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, China
| | - Yiu Fai Tsang
- Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, New Territories, Hong Kong SAR, China
| | - Kanchan Maiti
- Department of Oceanography and Coastal Sciences, College of the Coast and Environment, Louisiana State University, Baton Rouge, LA, USA
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6
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Zhu Q, Li G, Jiang Z, Li M, Ma C, Li X, Li Q. Investigating the variation of dissolved organic matters and the evolution of autotrophic microbial community in composting with organic and inorganic carbon sources. BIORESOURCE TECHNOLOGY 2020; 304:123013. [PMID: 32086034 DOI: 10.1016/j.biortech.2020.123013] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Revised: 02/07/2020] [Accepted: 02/11/2020] [Indexed: 06/10/2023]
Abstract
The main purpose of this study was to analyze the effects of different carbon source (Na2CO3, NC; sugarcane molasses, SM) additives on dissolved organic matter (DOM), cbbL-containing autotrophic microbes (CCAM), and the relationship among physico-chemical parameters, DOM and CCAM to better understand carbon transformation in composting. The results showed that SM or NC additive could promote the degradation and transformation of OM and DOM. After adding SM or NC, the Simpson index decreased by 2.03% and 0.51%, respectively, and Luteimonas and Thermomonspora were detected using high throughput sequencing, indicating that SM and NC increased the diversity of CCAM community. Additionally, both NC and SM contributed to improve the abundance of cbbL gene (45.91% and 2.15%) based on fluorescence quantitative PCR (qPCR) analysis at the cooling phase of composting. Pearson correlation analysis revealed that Proteoobacteria, Firmicutes, Acidobacteria and Nematoda were positively related with C/N, OM and DOM (0.5 < R < 0.9, P < 0.05).
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Affiliation(s)
- Qiuhui Zhu
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Gen Li
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Zhiwei Jiang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Mingqi Li
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Chaofan Ma
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Xintian Li
- 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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7
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Hu J, Guo H, Wang X, Gao MT, Yao G, Tsang YF, Li J, Yan J, Zhang S. Utilization of the saccharification residue of rice straw in the preparation of biochar is a novel strategy for reducing CO 2 emissions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 650:1141-1148. [PMID: 30308802 DOI: 10.1016/j.scitotenv.2018.09.099] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 08/21/2018] [Accepted: 09/08/2018] [Indexed: 06/08/2023]
Abstract
Once rice straw has been bioconverted into biofuels, it is difficult to further biodegrade or decompose the saccharification residue (mainly lignin). Taking into account the pyrolysis characteristics of lignin, in this study the saccharification residue was used as a raw material for the preparation of biochar (biochar-SR), a potential soil amendment. Biochar was prepared directly from rice straw (biochar-O) with a yield of 32.45 g/100 g rice straw, whereas 30.14 g biochar-SR and 30.46 g monosaccharides (including 20.46 g glucose, 9.11 g xylose, and 0.89 g arabinose) were obtained from 100 g of rice straw. When added to liquid soil extracts as a soil amendment, almost nothing was released from biochar-SR, whereas numerous dissolved solids (about 70 mg/L) were released from biochar-O. Adding a mixture of biochar-SR and autotrophic bacteria improved soil total organic carbon 1.8-fold and increased the transcription levels of cbbL and cbbM, which were 4.76 × 103 and 3.76 × 105 times those of the initial blank, respectively. By analyzing the soil microbial community, it was clear that the above mixture favored the growth of CO2-fixing bacteria such as Ochrobactrum. Compared with burning rice straw or preparing biochar-O, the preparation of biochar-SR reduced CO2 emissions by 67.53% or 37.13%, respectively. These results demonstrate that biochar-SR has potential applications in reducing the cost of sustainable energy and addressing environmental issues.
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Affiliation(s)
- Jiajun Hu
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China
| | - Hongcheng Guo
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China; Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Xiahui Wang
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China
| | - Min-Tian Gao
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China.
| | - Guodong Yao
- State Key Lab of Metal Matrix Composites, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yiu Fai Tsang
- Department of Science and Environmental Studies, The Education University of Hong Kong, Hong Kong, China
| | - Jixiang Li
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Jianfang Yan
- Department of Science and Environmental Studies, The Education University of Hong Kong, Hong Kong, China; State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Saiwei Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
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8
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Feng S, Lin X, Tong Y, Huang X, Yang H. Biodesulfurization of sulfide wastewater for elemental sulfur recovery by isolated Halothiobacillus neapolitanus in an internal airlift loop reactor. BIORESOURCE TECHNOLOGY 2018; 264:244-252. [PMID: 29843112 DOI: 10.1016/j.biortech.2018.05.079] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Revised: 05/19/2018] [Accepted: 05/21/2018] [Indexed: 06/08/2023]
Abstract
The biodesulfurization of sulfide wastewater for elemental sulfur recovery by isolated Halothiobacillus neapolitanus in an internal airlift loop reactor (IALR) was investigated. The flocculant producer Pseudomonas sp. strain N1-2 was used to deposit the produced elemental sulfur during biodesulfurization. The functional group analysis indicated that biofloculation was closely associated with NH and CO. The biodesulfurization system performed well under moderate water quality fluctuations (1.29-3.88 kg·m-3·d-1 COD; 1.54-3.08 kg·m-3·d-1·S2-) as it maintained stable S2- removal and sulfur flocculation rates. Meanwhile, the qRT-PCR analysis indicated that the transcriptional level of cbbL decreased in the presence of organic carbon, while the expressions of sqr, sat, and cytochrome C3 increased under higher sulfide stress. Moreover, the relative proportions of Halothiobacillus was strengthened via microbial intervention of the LJN1-3 strain. The S2- removal efficiency and elemental sulfur production was further improved by 32.5% and 28.2%, respectively, in an IALR.
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Affiliation(s)
- Shoushuai Feng
- Key Laboratory of Carbohydrate Chemistry and Biotechnology (Jiangnan University) Ministry of Education, People's Republic of China; The Key Laboratory of Industrial Biotechnology, Ministry of Education, People's Republic of China; School of Biotechnology, Jiangnan University, Wuxi 214122, People's Republic of China
| | - Xu Lin
- Key Laboratory of Carbohydrate Chemistry and Biotechnology (Jiangnan University) Ministry of Education, People's Republic of China; The Key Laboratory of Industrial Biotechnology, Ministry of Education, People's Republic of China; School of Biotechnology, Jiangnan University, Wuxi 214122, People's Republic of China
| | - Yanjun Tong
- National Engineering Research Center for Functional Food, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China
| | - Xing Huang
- WUXI City Environmental Technology Co., Ltd, People's Republic of China
| | - Hailin Yang
- Key Laboratory of Carbohydrate Chemistry and Biotechnology (Jiangnan University) Ministry of Education, People's Republic of China; The Key Laboratory of Industrial Biotechnology, Ministry of Education, People's Republic of China; School of Biotechnology, Jiangnan University, Wuxi 214122, People's Republic of China.
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9
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Wang YN, Tsang YF, Wang L, Fu X, Hu J, Li H, Le Y. Inhibitory effect of self-generated extracellular dissolved organic carbon on carbon dioxide fixation in sulfur-oxidizing bacteria during a chemoautotrophic cultivation process and its elimination. BIORESOURCE TECHNOLOGY 2018; 252:44-51. [PMID: 29306128 DOI: 10.1016/j.biortech.2017.12.089] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 12/26/2017] [Accepted: 12/27/2017] [Indexed: 06/07/2023]
Abstract
The features of extracellular dissolved organic carbon (EDOC) generation in two typical aerobic sulfur-oxidizing bacteria (Thiobacillus thioparus DSM 505 and Halothiobacillus neapolitanus DSM 15147) and its impact on CO2 fixation during chemoautotrophic cultivation process were investigated. The results showed that EDOC accumulated in both strains during CO2 fixation process. Large molecular weight (MW) EDOC derived from cell lysis and decay was dominant during the entire process in DSM 505, whereas small MW EDOC accounted for a large proportion during initial and middle stages of DSM 15147 as its cytoskeleton synthesis rate did not keep up with CO2 assimilation rate. The self-generated EDOC feedback repressed cbb gene transcription and thus decreased total bacterial cell number and CO2 fixation yield in both strains, but DSM 505 was more sensitive to this inhibition effect. Moreover, the membrane bioreactor effectively decreased the EDOC/TOC ratio and improved carbon fixation yield of DSM 505.
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Affiliation(s)
- Ya-Nan Wang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
| | - Yiu Fai Tsang
- Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, New Territories, Hong Kong Special Administrative Region, China
| | - Lei Wang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Research Institute for Shanghai Pollution Control and Ecological Security, 200092, China.
| | - Xiaohua Fu
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Research Institute for Shanghai Pollution Control and Ecological Security, 200092, China
| | - Jiajun Hu
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China
| | - Huan Li
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Research Institute for Shanghai Pollution Control and Ecological Security, 200092, China
| | - Yiquan Le
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Research Institute for Shanghai Pollution Control and Ecological Security, 200092, China
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10
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Enhanced roles of biochar and organic fertilizer in microalgae for soil carbon sink. Biodegradation 2017; 29:313-321. [PMID: 28321595 DOI: 10.1007/s10532-017-9790-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 03/12/2017] [Indexed: 10/19/2022]
Abstract
Improved soil carbon sink capability is important for the mitigation of carbon dioxide emissions and the enhancement of soil productivity. Biochar and organic fertilizer (OF) showed a significant improving effect on microalgae in soil carbon sink capacity, and the ultimate soil total organic carbons with microalgae-OF, microalgae-biochar, microalgae-OF-biochar were about 16, 67 and 58% higher than that with microalgae alone, respectively, indicating that carbon fixation efficiency of microalgae applied in soil was improved with biochar and OF whilst the soil carbon capacity was promoted, the mechanism of which is illustrated through simulative experiments. Organic fertilizer could spur algal conversion of carbon into cell molecules by increasing intracellular polysaccharide production of microalgae. Biochar could change carbon metabolism pathway of microalgae through altering the yield of intracellular saccharides, and yield and type of extracellular saccharides. There was a superimposition effect on the soil carbon sink when biochar and OF were both present with microalgae.
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Hu J, Xue Y, Li J, Wang L, Zhang S, Wang YN, Gao MT. Characterization of a designed synthetic autotrophic–heterotrophic consortia for fixing CO2 without light. RSC Adv 2016. [DOI: 10.1039/c6ra13118b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
CO2 fixation efficiency of the devised synthetic microbial consortia with both autotrophic–autotrophic and autotrophic–heterotrophic microbial interactions were higher than the sum of theoretical CO2 fixation efficiency of the microbial components.
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Affiliation(s)
- Jiajun Hu
- Shanghai Key Laboratory of Bio-Energy Crops
- School of Life Sciences
- Shanghai University
- Shanghai 200444
- China
| | - Yiyun Xue
- Shanghai Key Laboratory of Bio-Energy Crops
- School of Life Sciences
- Shanghai University
- Shanghai 200444
- China
| | - Jixiang Li
- Shanghai Advanced Research Institute
- Chinese Academy of Sciences
- Shanghai 20110
- China
| | - Lei Wang
- State Key Laboratory of Pollution Control and Resource Reuse
- School of Environmental Science and Engineering
- Tongji University
- Shanghai 200092
- China
| | - Shiping Zhang
- Shanghai Advanced Research Institute
- Chinese Academy of Sciences
- Shanghai 20110
- China
| | - Ya-nan Wang
- State Key Laboratory of Pollution Control and Resource Reuse
- School of Environmental Science and Engineering
- Tongji University
- Shanghai 200092
- China
| | - Min-tian Gao
- Shanghai Key Laboratory of Bio-Energy Crops
- School of Life Sciences
- Shanghai University
- Shanghai 200444
- China
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12
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Hu J, Wang L, Zhang S, Xi X, Le Y, Fu X, Tsang Y, Gao M. Interactions Between Autotrophic and Heterotrophic Strains Improve CO2 Fixing Efficiency of Non-photosynthetic Microbial Communities. Appl Biochem Biotechnol 2015; 176:1459-71. [DOI: 10.1007/s12010-015-1657-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 04/28/2015] [Indexed: 10/23/2022]
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13
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Wang YN, Wang L, Shan YN, Hu J, Tsang Y, Hu Y, Fu X, Le Y. Optimization of inorganic carbon sources to improve the carbon fixation efficiency of the non-photosynthetic microbial community with different electron donors. ENVIRONMENTAL TECHNOLOGY 2015; 36:1246-1255. [PMID: 25367398 DOI: 10.1080/09593330.2014.983991] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
As the non-photosynthetic microbial community (NPMC) isolated from seawaters utilized inorganic carbon sources for carbon fixation, the concentrations and ratios of Na2CO3, NaHCO3, and CO2 were optimized by response surface methodology design. With H2 as the electron donor, the optimal carbon sources were 270 mg/L Na2CO3, 580 mg/L NaHCO3, and 120 mg/L CO2. The carbon fixation efficiency in response to total organic carbon (TOC) was up to 30.59 mg/L with optimal carbon sources, which was about 50% higher than that obtained with CO2 as the sole carbon source. The mixture of inorganic carbon sources developed a buffer system to prevent acidification or alkalization of the medium caused by CO2 or Na2CO3, respectively. Furthermore, CO2 and HCO3(-), the starting points of carbon fixation in the pathways of Calvin-Benson-Bassham and 3-hydroxypropionate cycles, were provided by the carbon source structure to facilitate carbon fixation by NPMC. However, in the presence of mixed electron donors composed of 1.25% Na2S, 0.50% Na2S2O3, and 0.457% NaNO2, the carbon source structure did not exhibit significant improvement in the carbon fixation efficiency, when compared with that achieved with CO2 as the sole carbon source. The positive effect of mixed electron donors on inorganic carbon fixation was much higher than that of the carbon source structure. Nevertheless, the carbon source structure could be used as an alternative to CO2 when using NPMC to fix carbon in industrial processes.
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Affiliation(s)
- Ya-nan Wang
- a State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering , Tongji University , Shanghai 200092 , People's Republic of China
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14
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Wang Y, Hatakeyama M, Ogata K, Wakabayashi M, Jin F, Nakamura S. Activation of CO2by ionic liquid EMIM–BF4in the electrochemical system: a theoretical study. Phys Chem Chem Phys 2015; 17:23521-31. [DOI: 10.1039/c5cp02008e] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electrochemical reduction of CO2to CO by an ionic liquid EMIM–BF4is one of the most promising CO2reduction processes proposed so far with its high Faradaic efficiency and low overpotential.
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Affiliation(s)
| | | | - Koji Ogata
- Nakamura Laboratory
- RIKEN Innovation Center
- Wako
- Japan
| | | | - Fangming Jin
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
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Hu J, Wang L, Zhang S, Wang Y, Jin F, Fu X, Li H. Universally improving effect of mixed electron donors on the CO₂ fixing efficiency of non-photosynthetic microbial communities from marine environments. J Environ Sci (China) 2014; 26:1709-1716. [PMID: 25108727 DOI: 10.1016/j.jes.2014.06.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 10/24/2013] [Accepted: 02/12/2014] [Indexed: 06/03/2023]
Abstract
The universality of improved CO₂ fixing upon the addition of mixed electron donors (MEDs) composed of Na₂S, NO₂(-), and S₂O₃(2-) to non-photosynthetic microbial communities (NPMCs) obtained from 12 locations in four oceans of the world was validated. The CO₂ fixing efficiencies of NPMCs were universally enhanced by MED compared with those obtained using H₂ alone as electron donor, with average increase of about 276%. An increase in microbial inoculation concentration could increase the net amount of CO₂ fixing to 853.34 mg/L in the presence of MED. NO₂(-) and S₂O₃(2-) may play the roles of both electron acceptor and electron donor under aerobic conditions, which may improve the energy utilization efficiency of NPMC and enhance the CO₂ fixation efficiency. The sequence determination of 16S ribosomal deoxyribonucleic acid (rDNA) from 150 bacteria of NPMC showed that more than 50% of the bacteria were symbiotic and there were many heterotrophic bacteria such as Vibrio natriegens. These results indicate that NPMC acts as a symbiotic CO₂ fixing system. The interaction between autotrophic and heterotrophic bacteria may be a crucial factor supporting ladder utilization and recycling of energy/carbon source.
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Affiliation(s)
- Jiajun Hu
- School of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.
| | - Lei Wang
- School of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.
| | - Shiping Zhang
- Low-Carbon Conversion Science and Engineering Center, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Yuanqing Wang
- School of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China
| | - Fangming Jin
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xiaohua Fu
- School of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China
| | - Huirong Li
- Polar Research Institute of China, Shanghai 200136, China
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Hu J, Wang L, Zhang S, Le Y, Fu X. Feasibility of a two-step culture method to improve the CO2-fixing efficiency of nonphotosynthetic microbial community and simultaneously decrease the spontaneous oxidative precipitates from mixed electron donors. Appl Biochem Biotechnol 2014; 173:2307-20. [PMID: 24980751 DOI: 10.1007/s12010-014-1036-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 06/19/2014] [Indexed: 11/30/2022]
Abstract
When compared with H2, mixed electron donors (MED), comprising S(2-), S2O3 (2-), and NO2 (-), could generally improve the CO2-fixing efficiency of nonphotosynthetic microbial communities (NPMCs). However, a large amount of abiotic precipitates combined with bacteria produced during culture may be unfavorable for the recycling and reuse of bacteria. The main component of the abiotic precipitates is S(0), which influences the enrichment and reuse of bacteria but is not conducive for CO2 fixation in the subsequent step. In this study, a two-step culture method (TSCM), employing H2 and MED, respectively, was verified to be feasible for improving the CO2-fixing efficiency of NPMCs in the second step. In the TSCM, the net-fixed CO2 increased to 854 mg/L and abiotic precipitates were not produced in the medium. Sequence analysis of 16 s rDNA from NPMC indicated the presence of microbial symbioses in the NPMC, supporting the possible applications of TSCM.
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Affiliation(s)
- Jiajun Hu
- School of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China
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Zhao Y, Wang J, Zhang H, Yan C, Zhang Y. Effects of various LED light wavelengths and intensities on microalgae-based simultaneous biogas upgrading and digestate nutrient reduction process. BIORESOURCE TECHNOLOGY 2013; 136:461-468. [PMID: 23567717 DOI: 10.1016/j.biortech.2013.03.051] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2013] [Revised: 03/08/2013] [Accepted: 03/09/2013] [Indexed: 06/02/2023]
Abstract
Biogas is a well-known, primary renewable energy source, but its utilizations are possible only after upgrading. The microalgae-based bag photo-bioreactor utilized in this research could effectively upgrade biogas and simultaneously reduce the nutrient content in digestate. Red light was determined as the optimal light wavelength for microalgae growth, biogas upgrading, and digestate nutrient reduction. In the range of moderate light intensities (i.e., 800, 1200, 1600, and 2000 μmol m(-2) s(-1)), higher light intensities achieved higher biogas upgrade and larger digestate nutrient reduction. Methane content attained the highest value of 92.74±3.56% (v/v). The highest chemical oxygen demand, total nitrogen, and total phosphorus reduction efficiency of digestate were 85.35±1.04%, 77.98±1.84%, and 73.03±2.14%, respectively. Considering the reduction and economic efficiencies of the carbon dioxide content of biogas and digestate nutrient as well as the biogas upgrading standard, the optimal light intensity range was determined to be from 1200 to 1600 μmol m(-2) s(-1).
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Affiliation(s)
- Yongjun Zhao
- College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, PR China
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