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Influence of dissolved organic matter on methylmercury transformation during aerobic composting of municipal sewage sludge under different C/N ratios

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Journal of Environmental Sciences 2022年第9期34卷 130-138页

作者： Xin Zheng Jing Wang Chuanbing Zhang Yong Zhang Doudou Huang Shuxiao Yan Tengfei Sun Yuxiang Mao Yong Cai School of Resources&Environment Henan Polytechnic UniversityJiaozuo 454000China School of Environment and Health Jianghan UniversityWuhan 430056China Huaxia Besince Environmental Technology Co.Ltd. Zhengzhou 450008China Department of Chemistry and Biochemistry&Southeast Environmental Research Center Florida International UniversityMiamiFL 33199USA

Current knowledge about the transformation of total mercury and methylmercury(Me Hg) in aerobic composting process is limited. In this study, the composition and transformation of mercury and dissovled organic matter(DOM) in aerobic composting process of municipal sewage sludge were were comprehensively characterized, and the differences among the three C/N ratio(20, 26 and 30) were investigated. The main form of mercury in C/N 20 and 26 was organo-chelated Hg(F3, 46%-60%);while the main form of mercury in C/N 30 was mercuric sulfide(F5, 64%-70%). The main component of DOM in C/N 20 and 26 were tyrosine-like substance(C1, 53%-76%) while the main fractions in C/N 30 were tyrosine-like substance(C1, 28%-37%) and fulvic-like substance(C2, 17%-39%). The mercury and DOM varied significantly during the 9 days composting process. Compared to C/N 20 and 26, C/N 30 produced the less Me Hg after aerobic composting process, with values of 658%(C/N 20), 1400%(C/N 26) and 139%(C/N 30) of the initial, respectively. Meanwhile, C/N 30 produced the best compost showed greater degree of DOM molecular condensation and humification. Hg fraction had been altered by DOM, as indicated by a significant correlation between mercury species and DOM components. Notably, C/N 30 should be used as an appropriate C/N ratio to control the methylation processes of mercury and degration of DOM.

关键词： Methylmercury Dissolved organic matter Municipal sewage sludge aerobic composting C/N ratio

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Environmental effects and risk control of antibiotic resistance genes in the organic solid waste aerobic composting system: A review

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Frontiers of Environmental Science & Engineering 2021年第6期15卷 129-140页

作者： Caihong Huang Zhurui Tang Beidou Xi Wenbing Tan Wei Guo Weixia Wu Caiyun Ma State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Innovation Base of Ground Water&Environmental System Engineering Chinese Research Academy of Environmental SciencesBeijing 100012China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China School of Environmental and Municipal Engineering Lanzhou Jiaotong UniversityLanzhou 730070China College of Environmental Science and Engineering Guilin University of TechnologyGuilin 541004China

Antibiotic resistance genes(ARGs)have been diffusely detected in several kinds of organic solid waste,such as livestock manure,sludge,antibiotic fermentation residues,and food waste,thus attracting great *** composting,which is an effective,harmless treatment method for organic solid waste to promote recycling,has been identified to also aid in ARG ***,the effect of composting in removing ARGs from organic solid waste has recently become ***,this article summarizes and reviews the research on ARGs in relation to composting in the past 5 *** in organic solid waste could spread in different environmental media,including soil and the atmosphere,which could widen environmental ***,the conventional composting technology had limited effect on ARGs removal from organic solid *** composting processes,such as hyperthermophilic temperature composting,could effectively remove ARGs,and the HGT of ARGs and the microbial communities are identified as vital influencing ***,during the composting process,ARGs were mainly affected by three response pathways,(Ⅰ)“Microenvironment-ARGs”;(Ⅱ)“Microenvironment-microorganisms-ARGs”;(Ⅲ)“Microorganisms-horizontal gene transfer-ARGs”,*** pathway Ⅱ had been studied the most which was believed that microbial community was an important factor affecting *** response pathway Ⅲ,mainly believed that MGEs played an important role and paid less attention to *** research on the role and impact of eARGs in ARGs may be considered in the *** aims to provide support for further research on environmental risk control of ARGs in organic solid waste.

关键词： Antibiotic resistance genes Organic solid waste aerobic composting Livestock manure Sludge

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Formation of Struvite Crystals in a Simulated Food Waste aerobic composting Process

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Chemical Research in Chinese Universities 2010年第2期26卷 210-216页

作者： DU Xian-yuan LIU Jian-lin HUANG Guo-he LI YU Energy and Environmental Research Centre North China Electric Power University Beo＇ing 102206 P. R. China College of Environment and Resources Jilin University Changchun 130012 P. R. China Environmental Systems Engineering Program Faculty of Engineering University of Regina Regina SK S4S OA2 Canada

Bench-scale treatments with three mixtures of Mg and P salts, including K3PO4＋MgSO4, K2HPO4＋MgSO4, and KH2PO4＋MgSO4 as additives in a simulated food waste aerobic composting process, were conducted to test the magnesium ammonium phosphate（MAP） formation, and the compost products were analyzed by X-ray diffraction（XRD）, Scanning electron microscopy（SEM）, and Energy dispersive X-ray spectroscopy（EDS） analyses. The comparison results between XRD, SEM, and EDS analyses of MAPs in the dried compost and synthesized MAPs confirm the formation of MAP crystals in the simulated food waste aerobic composting process. The analysis of the compost also indicates that the addition of all the three mixtures of Mg and P salts in the aerobic composting process can increase nitrogen conservation and decrease nitrogen loss because of the formation of MAPs. The mechanism of MAP formation was verified as the reaction of ammonium（NH4＋） with magnesium（Mg^2＋） and phosphate[HnPO4^（3-n） , n=0, 1, and 2）.

关键词： Phosphate Magnesium sulphate Magnesium ammonium phosphate Food waste treatment aerobic composting

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Phosphate rock reduces the bioavailability of heavy metals by influencing the bacterial communities during aerobic composting

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Journal of Integrative Agriculture 2021年第5期20卷 1137-1146页

作者： CUI Hu OU Yang WANG Li-xia YAN Bai-xing LI Ying-xin DING Da-wei Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102P.R.China Jilin Provincial Engineering Center of CWs Design in Cold Region&Beautiful Country Construction Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China

Available information on the microbial mechanisms associated with heavy metal(HM)passivation during co-composting amended with phosphate rock(PR)remains ***,this study investigated the dynamic changes in bacterial communities and HM-fractions(Zn,Cu,Cd,Cr and Pb)during swine manure composting with maize straw,and ascertained the bacterial influence on *** results demonstrated that the addition of PR improved HM-passivation,especially for Zn and Cd,with their bioavailability factors(BFs)reduced by 247.41 and 176.25%,*** for bacterial communities,the proportion of Firmicutes decreased,while the proportions of Proteobacteria,Bacteroidetes,DeinococcusThermus and Gemmatimonadetes increased in all *** significantly changed the primary bacterial phyla in the thermophilic *** were the main bacterial component controlling the passivation of Zn,Cu and Cr,while Deinococcus-Thermus mainly regulated the mobility of Zn and Pb,and Proteobacteria only dominated the transformation among *** results may provide a reference for the use of HM-passivation techniques during composting.

关键词： aerobic composting heavy metals bacterial community phosphate rock

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aerobic composting of paper mill sludge and the reuse of compost in agriculture

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Journal of Environmental Science and Engineering 2009年第1期3卷 29-36页

作者： LIN Yun-qin ZHOU Shao-qi College of Environmental Science and Engineering South China Agricultural University Guangzhou 510642 China College of Environmental Science and Engineering South China University of Technology Guangzhou 510640 China

Paper mill sludge （PMS） is a kind of bio-solid waste. The technology of aerobic composting of PMS was investigated. The ratio of the material components was as follows, sludge：chicken dung：spill=6kg：2kg：4kg, which could attain 55% moisture content （MC） and 25 the ration of carbon to nitrogen （C/N）. The aeration rule of fan was controlled by single chip microcomputer （SCM）. During composting, the system temperature more than 55℃ lasted for 3 days, pH changed in the range of 6.5-8.5 and MC changed between 53% to 60%. PMS became mature on the 20th day. The germination index （GI） of compost attained 95% or so and coliform was 23/100 ml volatile solid （VS） and organic carbon （OC） were stable at the content of 60% and 30%, respectively. The result showed that this technology could make the sludge stable and innocuous. A pot experiment with latosolic red soil mixed with paper mill sludge compost （PMSC） was carried on. The result showed that PMSC could increase the crop biomass, the soil nutrients and the physical characteristics of the soil, such as OC, total nitrogen （TN）, total phosphorus （TP）. The total amount of heavy metals in the soil was measured to be lower than the Environmental standard for soil in China （GB15618-1995）. So PMSC was a good and safe soil amendment.

关键词： aerobic composting paper mill sludge compost reuse in agriculture

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Study on aerobic composting of Mixed Municipal Sludge, Kitchen Waste and Water Hyacinth

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International Journal of Technology Management 2013年第11期 115-120页

作者： ZHANG Shu-juan Lin Zhuo-ling ZHANG Xu-lan The Research Institute of Environment Science Sun Yat-sen University Guangzhou 510275 China

In this study, a in vessel aerobic composting method is adopted to investigate the variation rules of various evaluation parameters （temperature, moisture content, pH, organic matter, water soluble ammonia nitrogen, water soluble nitrate nitrogen and germination index） in cocomposting of municipal sludge, kitchen waste and water hyacinth at different proportions. The results show that, in composting, the parameters of moisture content, pH, water soluble ammonia nitrogen and water soluble nitrate nitrogen demonstrate marked dynamic change rules during composting process; the temperature of three groups of compost materials rapidly rise to above 55 ~C within 96h, and last for 3 - 7d, meeting the harmless requirements, and their organic matter degradation rate excess 30%, the GI index is higher than 83%, in line with the requirements on maturity, which proves that the co-composting of municipal sludge, kitchen waste and water hyacinth can realize harmlessness and resource reutilization after composting.

关键词： sewage sludge kitchen waste water hyacinth aerobic composting

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Effects of Different Microbial Agents on aerobic composting of Cow Manure

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Meteorological and Environmental Research 2015年第8期6卷 27-29页

作者： Duan Lijie Ma Jili Chen Wenying Jilin Academy of Environmental Sciences

For the control of environment pollution caused by livestock and poultry manure, four microbial strains conducive to aerobic composting were selected and mixed into four compound microbial agents, and effects of different compound microbial agents on aerobic composting of cow manure were studied from aspects of changes in temperature, pH, water content and C/N during the composting process. The results show that microbial agent M2 has the best effect for aerobic composting of cow manure, so microbial agent M2 has broad popularization and application prospect in livestock and poultry farms in low-temperature areas of Northeast China.

关键词： Cow manure aerobic composting Microbial agents China

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Effects of Biochar on Substrate Degradation and Ammonia Emission during aerobic composting of Chicken Manure

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Agricultural Science & Technology 2018年第3期19卷 58-66页

作者： HE Yuan-ling XING Ze-bing WU Xiao-dong School of Engineering Shanxi Agricultural UniversityTaigu 030801PRC The Centre of Experimental Education Shanxi Agricultural UniversityTaigu 030801PRC

In this study, chicken manure and Caragana korshinskii Kom powder were used as the main raw materials with different amounts of biochar added to test four aerobic composting treatment groups A, B, C and D with laboratory composting fermenters and testing apparatus, and new insight into biochar’s nitrogen conservation mechanism was gotten, based on the experimental data and related exploration such as the physical and chemical properties of the final products, the changing interactions among nutrient elements and other elements, and the relationship between substrate degradation and the amount of biochar used as well as the best formula for reducing ammonia emission. The results showed that the proper proportion of the added biochar to the other elements was conducive to less ammonia emission and nitrogen loss during the aerobic composting. The composting effect of Treatment C （biochar at 20%） was the optimal in the test, where in the composting temperature rose the most rapid and the earliest to the maximum temperature 52.5℃, with the least nitrogen loss. An effective, safe and high-quality resource utilization of chicken manure was established through the aerobic composting with reasonable material mixture proportion.

关键词： Biochar Chicken manure aerobic composting Ammonia emission

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Succession of bacterial community during composting:dissimilarity between compost mixture and biochar additive

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Biochar 2021年第2期3卷 229-237页

作者： Muyuan Zhang Weng Liang Zhineng Tu Ronghua Li Zengqiang Zhang Amjad Ali Ran Xiao Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin College of Resources and EnvironmentSouthwest UniversityChongqing 400715China College of Natural Resources and Environment Northwest A&F UniversityYangling 712100ShaanxiChina School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China

Previous research showed that biochar addition facilitated composting and elevated nutrient ***,few of these studies explored bacterial structure and abundance in the compost mixture and biochar ***,this study aims to distinguish bacterial communities in both compost and bamboo biochar(BB)*** indicated that the dynamics of nutrient contents in compost and BB samples were in a similar pattern,although there were lower levels of nutrients and metals(i.e.,Cu and Zn)in BB *** total number of operational taxonomic units(OTUs)in both compost and BB additives peaked on day 7 and then gradually reduced during *** was more abundance of bacteria in compost,whereas the diversity of bacteria was more in BB ***,the dominant bacteria in compost and BB samples were distinct at the different stages of *** Firmicutes steadily decreased in compost samples(from 34.78%to 7.65%),while it was the dominant phylum in BB additives during the whole composting ***,Ruminofilibacter,Pseudoxanthomonas,and Actinomadura were the most abundant genera in compost samples than Pseudoxanthomonas,Azoarcus,and Paenibacillus in BB additives at the final stage of *** from this study could provide a theoretical reference for the sound performance of biochar-added composting.

关键词： aerobic composting Bacterial community succession Bamboo biochars 16S rDNA

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Feasible strategy for the nitrogen fixation and humification quality improvement by spent mushroom substrate as conditioning agent

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International Journal of Agricultural and Biological Engineering 2024年第3期17卷 235-240页

作者： Shuang Ai Yuanbei Zhang Guoxiang Zheng College of Engineering Northeast Agricultural UniversityHarbin 150030China Key Laboratory of Swine Facilities Engineering Ministry of Agriculture and Rural AffairsHarbin 50030China Heilongjiang Key Laboratory of Technology and Equipment for the Utilization of Agricultural Renewable Resources Harbin 150030China

There is an overlooked problem which increasing microbial abundance while reducing nitrogen loss during *** study investigated the viability of spent mushroom substrate(SMS)as conditioners in the aerobic composting of kitchen waste(KW)with cattle manure(CM).The variation of temperature,pH,C/N,organic matter,cellulose,hemicelluloses,germination index(GI),and microflora structure were explored to evaluate the potential in accelerating maturity and nitrogen fixation by SMS *** results showed that the addition of SMS accelerated the heating rate,prolonged the high temperature time,and decreased organic matter,hemicellulose,and cellulose by 17.49%,23.61%,and 18.62%,*** GI reached 105.86%with SMS addition,while 74.17%was found in control treatment after *** changed the microbial community composition and increased the species ***,Clostridium XI and Azomonas were dominant bacteria,which increased the retention of nitrogen,promoted organic matter degradation and reduce compost *** study can provide a feasible strategy for nitrogen fixation in the field of organic waste recycling.

关键词： spent mushroom substrate conditioning agent nitrogen fixation humification quality aerobic composting

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