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Effects of oxidizing environment on digestate humification and identification of substances governing the dissolved organic matter(DOM)transformation process

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Frontiers of Environmental Science & Engineering 2022年第8期16卷 121-133页

作者： Yingchao Zhang Hongqiong Zhang Xinwei Dong dongbei yue Ling Zhou Heibei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse Key Laboratory of Applied ChemistrySchool of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China School of Environment Tsinghua UniversityBeijing 100084China College of Engineering Northeast Agricultural UniversityHarbin 150030China School of Mechanical Electrification Engineering Tarim UniversityAlaer 843300China

The formation of humic-like acids(HLAs)is an essential process for converting liquid digestate into organic soil amendments to enhance agricultural *** aim of this study was to investigate the impact of oxygen and/or MnO_(2)on the production of ***,abiotic humification performance of the digestate dissolved organic matter(DOM)is investigated with fluxes of air and N2 in the absence and presence of MnO_(2).Our results demonstrated that the fate of digestate DOM greatly depends on the oxidizing environment,the MnO_(2)enhanced nitrogen involved in the formation of *** synergistic effects of MnO_(2)and oxygen effectively improved the production of HLAs,and the corresponding component evolution was analyzed using spectroscopic *** twodimensional correlation spectroscopy results demonstrated that the reaction sequence of digestate DOM followed the order of protein-like substances,substances with an absorbance at 325 nm,substances with UV absorbance at 254 nm and ***,excitation emission matrix fluorescence combined with parallel factor analysis(EEM-PARAFAC)showed that tryptophan-like C3 was more prone to transformation than tyrosine-like C2 and was responsible for the humification *** substance with an absorbance at 325 nm was a reaction intermediate in the transformation process of protein-like substances to *** above findings can be used to promote the production of liquid fertilizer associated with carbon sequestration as well as the sustainable development of biogas production.

关键词： Liquid digestate MnO_(2) Oxygen DOM transformation Humic-like acids

Evolution of humic substances in polymerization of polyphenol and amino acid based on non-destructive characterization

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Frontiers of Environmental Science & Engineering 2021年第1期15卷 91-100页

作者： Jianmei Zou Jianzhi Huang Huichun Zhang dongbei yue School of Environment Tsinghua UniversityBeijing 100084China Department of Civil and Environmental Engineering Case Western Reserve UniversityClevelandOH 44106USA

Abiotic humification is important in the formation and evolution of organic matter in soil and compost maturing ***,the roles of metal oxides in abiotic humification reactions under micro-aerobic remain *** aim of this study was to use non-destructive measurement methods to investigate the role of MnO_(2) in the evolution of humic substances(HSs)during oxidative polymerization of polyphenol-amino *** results suggested a synergistic effect between MnO_(2) and O_(2) in promoting the polymerization reaction and identified that MnO_(2) alone had a limited ability in accelerating the transformation of fulvic acid(FA)to humic acid(HA),whereas O_(2) was the key factor in the ***-dimensional correlation spectroscopy(2D-COS)showed that the evolution in the UV-vis spectra followed the order of 475–525 nm>300–400 nm>240–280 nm in the humification process,indicating the formation of simple organic matter followed by FA and then HA.13C nuclear magnetic resonance(13C NMR)analysis revealed that the products under both air and N2 conditions in the presence of MnO_(2) had greater amounts of aromatic-C than in the absence of MnO_(2),demonstrating that MnO_(2) affected the structure of the humification *** results of this study provided new insights into the theory of abiotic humification.

关键词： Two-dimensional correlation spectroscopy(2D-COS) Humic substances(HSs) Humification Manganese dioxide Polyphenol

Mechanism of oxidation and catalysis of organic matter abiotic humification in the presence of MnO_2

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Journal of Environmental Sciences 2019年第3期31卷 167-173页

作者： Yingchao Zhang dongbei yue Xu Wang Wenfang Song Key Laboratory for Solid Waste Management and Environment Safety (MOE) School of Environment Tsinghua University Beijing Production and Marketing Service Station for Superiors Agricultural Products

Humification plays a critical role in the environmental fate of organic wastes, and MnO_2 holds great promise for enhancing this reaction. However, the effects of MnO_2 on the enhancement of the humification reaction remain ambiguous. To better reveal the mechanism by which MnO_2 enhances the reaction and investigate the fate of the humification products, abiotic humification experiments were performed using increasing concentrations of dissolved organic matter(DOM) to a fixed amount of MnO_2. DOM was represented by model humic precursors consisting of catechol, glucose and glycine. The results indicate that the reduction of MnO_2 played a dominant role in the formation of fulvic-like acids(FLAs), and the subsequent reduction products, MnOOH and Mn(II), acted as catalysts in the formation of humic-like acids(HLAs). Moreover, CO_2 release occurred during the formation of FLAs, and a strong linear correlation between CO_2 release and the formation of FLAs was observed(p < 0.01), where 0.73–1.87 mg of CO_2 was released per mg dissolved organic carbon(DOC)FLAs. Furthermore, the concentration of MnO_2 had a pronounced influence on the product behavior, where a lower MnO_2 concentration decreased the quantity of FLAs produced.

关键词： Abiotic humification MnO2 Fulvic-like acids Humic-like acids CO2 release

Characterization of humic substances in bio-treated municipal solid waste landfill leachate

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Frontiers of Environmental Science & Engineering 2012年第5期6卷 711-716页

作者： Guangxia QI dongbei yue Yongfeng NIE Key Laboratory for Solid Waste Management and Environment Safety(Ministry of Education) Tsinghua UniversityBeijing 100084China

Considerable organic matter remains in muni- cipal solid waste landfill leachate after biological treat- ments. Humic substances （HSs） dominate the organic matter in bio-treated landfill leachate. In this study, the HSs from landfill leachate treated by membrane bioreactor （MBR-HSs） were analyzed via elemental analysis, ultra- violet-visible spectroscopy, Fourier transform infrared spectroscopy, and charge polarized magic-angle spin- ning-~3C-nuclear magnetic resonance. The characteristic absorption in the UV wavelength range indicated the presence of high C=C and C=O double bonds within the MBR-HSs. Compared with commercial HSs, MBR-HSs had lower carbon content [48.14% for fulvic acids （FA） and 49.52% for humic acids （HA）], higher nitrogen content （4.31% for FA and 6.16% for HA）, lower aromatic structure content, and higher carbohydrate and carboxylic atoms of carbon content. FA predominantly had an aliphatic structure, and HA had less condensed or substituted aromatic ring structures than natural HA. The aromatic carbon content of MBR-HSs was lower than that of humus-derived HSs but higher than that of waste- derived HSs, indicating that MBR-HSs appeared to be more similar to humus-derived HSs than waste-derived HA.

关键词： bio-treated landfill leachate humic sub-stances elemental analysis spectroscopic characteristics

Rapid degradation of hexachlorobenzene by micron Ag/Fe bimetal particles

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Journal of Environmental Sciences 2013年第3期25卷 473-478页

作者： Xiaoqin Nie Jianguo Liu Xianwei Zeng dongbei yue School of Environment Tsinghua UniversityKey Laboratory for Solid Waste Management and Environment SafetyMinistry of education of China

The feasibility of the rapid degradation of hexachlorobenzene （HCB） by micron-size silver （Ag）/iron （Fe） particles was ***/Fe particles with different ratios （0,0.05%,0.09%,0.20%,and 0.45%） were prepared by electroless silver plating on 300 mesh Fe powder,and were used to degrade HCB at different pH values and *** dechlorination ability of Fe greatly increased with small Ag addition,whereas too much added Ag would cover the Fe surface and reduce the effective reaction surface,thereby decreasing the extent of *** optimal Ag/Fe ratio was 0.09%.Tafel polarization curves showed that HCB was rapidly degraded at neutral or acidic pH,whereas low pH levels severely intensified H2 production,which consumed the reducing electrons needed for the HCB *** degradation was more sensitive to temperature than *** rate constant of HCB dechlorination was 0.452 min-1 at 85℃,50 times higher than that at 31℃.HCB was degraded in a successive dechlorination pathway,yielding the main products 1,2,4,5-tetrachlorobenzene and 1,2,4-trichlorobenzene within 2 hr.

关键词： dechlorination hexachlorobenzene silver-iron micron bimetallic particles chlorinated toxic organics

Modeling and simulation of landfill gas production from pretreated MSW landfill simulator

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Frontiers of Environmental Science & Engineering 2016年第1期10卷 159-167页

作者： Rasool Bux MAHAR Abdul Razaque SAHITO dongbei yue Kamranullah KHAN Institute of Environmental Engineering & Management Mehran University of Engineering & Technology Jamshoro Sindh 76062 Pakistan Department of Mechanical Engineering Mehran University of Engineering & Technology Jamshoro Sindh 76062 Pakistan School of Environment Tsinghua University BeiiinK 100084 China Pakistan Institute of Engineering and Applied Sciences EO. Nilore Islamabad 76132 Pakistan

The cumulative landfill gas （LFG） production and its rate were simulated for pretreated municipal solid waste （MSW） landfill using four models namely first order exponential model, modified Gompertz model, single component combined growth and decay model and Gaussian function. Considering the behavior of the pretreated MSW landfill, a new multi component model was based on biochemical processes that occurring in landfilled pretreated MSW. The model was developed on the basis of single component combined growth and decay model using an anaerobic landfill simulator reactor which treats the pretreated MSW. It includes three components of the degradation i.e. quickly degradable, moderately degradable and slowly degradable. Moreover, the devel- oped model was statistically analyzed for its goodness of fit. The results show that the multi components LFG production model is more suitable in comparison to the simulated models and can efficiently be used as a modeling tool for pretreated MSW landfills. The proposed model is likely to give assistance in sizing of LFG collection system, generates speedy results at lower cost, improves cost-benefit analysis and decreases LFG project risk. It also indicates the stabilization of the landfill and helps the managers in the reuse of the landfill space. The proposed model is limited to aerobically pretreated MSW landfill and also requires the values of delay times in LFG productions from moderately and slowly degradable fractions ofpretreated MSW.

关键词： combine growth and decay model pretreatedmunicipal solid waste (MSW) multi component landfill gas(LFG) model

Optimized production of a novel bioflocculant M-C11 by Klebsiella sp. and its application in sludge dewatering

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Journal of Environmental Sciences 2014年第10期26卷 2076-2083页

作者： Jiewei Liu Junwei Ma Yanzhong Liu Ya Yang dongbei yue Hongtao Wang State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University School of Environment Tsinghua University

The optimized production of a novel bioflocculant M-C11 produced by Klebsiella sp. and its application in sludge dewatering were investigated. The optimal medium carbon source,nitrogen source, metal ion, initial pH and culture temperature for the bioflocculant production were glucose, NaNO3, MgSO4, and pH 7.0 and 25°C, respectively. A compositional analysis indicated that the purified M-C11 consisted of 91.2% sugar, 4.6% protein and 3.9% nucleic acids（m/m）. A Fourier transform infrared spectrum confirmed the presence of carboxyl, hydroxyl,methoxyl and amino groups. The microbial flocculant exhibited excellent pH and thermal stability in a kaolin suspension over a pH range of 4.0 to 8.0 and a temperature range of 20 to 60°*** optimum bioflocculating activity was observed as 92.37% for 2.56 mL M-C11 and 0.37 g/L CaCl2 dosages using response surface methodology. The sludge resistance in filtration（SRF）decreased from 11.6 × 1012 to 4.7 × 1012m/kg, which indicated that the sludge dewaterability was remarkably enhanced by the bioflocculant conditioning. The sludge dewatering performance conditioned by M-C11 was more efficient than that of inorganic flocculating reagents,such as aluminum sulfate and polymeric aluminum chloride. The bioflocculant has advantages over traditional sludge conditioners due to its lower cost, benign biodegradability and negligible secondary pollution. In addition, the bioflocculant was favorably adapted to the specific sludge pH and salinity.

关键词： Bioflocculant Klebsiella sp. Optimized production Response surface methodology Sludge dewatering

Effectiveness of aerobic pretreatment of municipal solid waste for accelerating biogas generation during simulated landfilling

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Frontiers of Environmental Science & Engineering 2018年第3期12卷 79-87页

作者： Munawar Ali Junli Zhang Roberto Raga Maria Cristina Lavagnolo Alberto Pivato Xu Wang Yuanyuan Zhang Raffaello Cossu dongbei yue School of Environment Tsinghua University Beijing 100084 China Key Laboratory for Solid Waste Management and Environment Safety (Tsinghua University) Ministry of Education of China Beijing 100084 China Solid waste and Chemical Management Centre Ministry of Environmental Protection Beijing 100029 China DII Department of Industrial Engineering University of Padova Via Marzolo 9 35131 Padova Italy

This study evaluates the effectiveness of aerobic pretreatment of municipal solid waste （MSW） on reducing lag phase and accelerating biogas generation. Aerobic pretreatment degree （APD） was determined on the basis of reduction in volatile solids （VS） on a wet weight basis. In this study, intermittent aeration （IA） was applied to three reactors as a main aeration mode; since a single reactor was operated under continuous aeration mode. However, the purpose of the experiment was to reduce VS content of waste, irrespective of the comparison between aeration modes. Fresh MSW was first pretreated aerobically with different aeration rates （10, 40, 60 and 85 L/min/m3） for the period of 30- 50 days, resulting in VS-loss equivalent to 20%, 27%, 38% and 53q4 on w/w basis for the wastes AI, A2, A3 and A4, respectively. The cumulative biogas production, calculated based on the modified Gompertz model were 384, 195, 353,215, and 114 L/kg VS for the wastes A0, A1, A2, A3 and A4, respectively. Untreated waste （A0） showed a long lag phase; whereas the lag phases of pretreated MSW were reduced by more than 90e/L Aerobically pretreated wastes reached stable methanogenic phase within 41 days compared to 418 days for untreated waste. The waste mass decreased by about 8% to 27% compared to untreated MSW, indicative that even more MSW could be placed in the same landfill. The study confirmed the effectiveness of aerobic pretreatment of MSW prior to landfilling on reducing lag phase and accelerating biogas generation.

关键词： Municipal solid waste (MSW)Aerobic pretreatment degree (APD)Volatile solids (VS)Intermittent aeration (IA)Landfill gasLandfilling

Product Form Solution of a Queuing-Inventory System with Lost Sales and Server Vacation

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Journal of Systems Science & Complexity 2024年第2期37卷 729-758页

作者： yue Dequan ZHANG Yuying XU Xiuli yue Wuyi School of Science Yanshan UniversityQinhuangdao 066004China School of Economics and Management Yanshan UniversityQinhuangdao 066004China The Kyoto College of Graduate Studies for Informatics Kyoto City 606-8225Japan

In this study,the authors consider an M/M/1 queuing system with attached inventory under an(s,S)control *** server takes multiple vacations whenever the inventory is *** is assumed that the lead time and the vacation time follow exponential *** authors formulate the model as a quasi-birth-and-dearth(QBD)process and derive the stability condition of the ***,the stationary distribution in product form for the joint process of the queue length,the inventory level,and the server’s status is ***,the conditional distributions of the inventory level when the server is on and operational,and when it is off due to a vacation,are *** the stationary distribution,the authors obtain some performance measures of the *** authors investigate analytically the effect of the server’s vacation on the performance ***,several numerical examples are presented to investigate the effects of some parameters on the performance measures,the optimal policy,and the optimal cost.

关键词： Cost function multiple vacations product form solution queuing-inventory system (s S)control policy