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Impacts of wastewater sludge amendments in restoring nitrogen cycle in p-nitrophenol contaminated soil

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Journal of Environmental Sciences 2011年第4期23卷 616-623页

作者： F. Olcay Topac Sagban Department of Environmental Engineering Uludag University

The possible impacts on nitrogen-cycle in a p-nitrophenol （PNP） polluted soil and the effectiveness of wastewater sludge amendments in restoring nitrification potential and urease activity were evaluated by an incubation study. The results indicated that PNP at 250 mg/kg soil inhibited urease activity, nitrification potential, arginine ammonification rate and heterotrophic bacteria counts to some extents. After exposure to PNP, the nitrification potential of the tested soil was dramatically reduced to zero over a period of 30 days. Based on the findings, nitrification potential was postulated as a simple biochemical indicator for PNP pollution in soils. Nitrogen-cycling processes in soils responded positively to the applications of wastewater sludges. A sludge application rate of 200 tons/ha was sufficient for successful biostimulation of these nitrogen processes. The microbial activities in sludge-amended, heavy PNP-polluted soils seemed to recover after 30–45 days, indicating the effectiveness of sludge as a useful soil amendment.

关键词： p-nitrophenol wastewater sludge soil pollution nitrogen-cycle biostimulation

Thermal Hydrolysis of wastewater sludge Followed by Fungal Fermentation for Organic Recovery and Hyphae Fiber Production

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Engineering 2021年第2期7卷 203-211页

作者： Jia-jin Liang Bing Li Lei Wen Ruo-hong Li Xiao-yan Li Shenzhen Engineering Research Laboratory for sludge and Food Waste Treatment and Resource Recovery Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Shenzhen Environmental Science and New Energy Laboratory Tsinghua–Berkeley Shenzhen InstituteTsinghua UniversityShenzhen 518055China Environmental Engineering Research Centre Department of Civil EngineeringThe University of Hong KongHong Kong 999077China

wastewater sludge creates a difficult environmental problem for many large *** study developed a three-phase innovative strategy for sludge treatment and reduction,including thermal hydrolysis,fungal fermentation,and anaerobic *** the temperature during the treatment from 140 to 180℃ significantly improved the sludge reduction and organic release efficiencies(psludge were 36.6%,47.7%,and 58.5%for treatment at 140,160,and 180℃,respectively,and the total organic carbon(TOC)conversion efficiency reached 28.0%,38.0%,and 45.1%,*** highest concentrations of carbohydrates and proteins were obtained at 160℃ in sludge liquor,whereas the amount of humic substances significantly increased for the treatment at 180℃(psludge liquor with Aspergillus niger converted the waste organics to valuable fiber *** biomass concentration of fungal hyphae reached 1.30 and 1.27 g·L^(-1) in the liquor of sludge treated at 140 and 160C,corresponding to organic conversion ratios of 24.6%and 24.0%,*** fungal hyphae produced from the sludge liquor can be readily used for making papers or similar value-added fibrous *** paper sheets made of hyphae fibers had a dense structure and strong strength with a tensile strength of 10.75 N·m·g^(-1).Combining fungal fermentation and anaerobic digestion,the overall organic utilization efficiency can exceed 75%for the liquor of sludge treated at 160℃.

关键词： wastewater sludge Thermal hydrolysis Fungal fermentation Hyphae fibers Anaerobic digestion sludge treatment

Evaluation of fungal potentiality for bioconversion of domestic wastewater sludge

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Journal of Environmental Sciences 2004年第1期16卷 132-137页

作者： Zahangir Alam A. Fakhru'l-Razi Abul H. Molla Department of Chemical and Environmental Engineering Faculty of EngineeringUniversiti Putra Malaysia 43400 UPM SerdangSelangor DE Malaysia Department of Biotechnology Engineering Faculty of Engineering International Islamic University Malaysia Jalan Gombak 53100 Kuala Lumpur Malaysia

This study was undertaken to screen the filamentous fungi isolated from its relevant habitats(wastewater, sewage sludge and sludge cake) for the bioconversion of domestic wastewater sludge. A total of 35 fungal strains were tested against wastewater sludge (total suspended solids, TSS 1%—5% w/w) to evaluate its potentiality for enhancing the biodegradability and dewaterability using liquid state bioconversion(LSB) process. The strains were divided into five groups i.e. Penicillium, Aspergillus, Trichoderma, Basidiomycete and Miscellaneous, respectively. The strains WWZP1003, SCahmA103, SCahmT105 and PC-9 among their respective groups of Penicillium, Aspergillus, Trichoderma and Basidiomycete played potential roles in terms of separation(formation of pellets/flocs/filaments), biodegradation(removal of COD) and filtration(filterability) of treated domestic wastewater sludge. The Miscellaneous group was not considered due to its unsatisfactory results as compared to the other groups. The pH value was also influenced by the microbial treatment during fermentation process. The filterability of treated sludge was improved by fungal treatment, and lowest filtration time was recorded for the strain WWZP1003 and SCahmA103 of Penicillium and Aspergillus groups respectively compared with other strains.

关键词： filamentous fungi screening wastewater sludge pellets filtration liquid state bioconversion

Improving sludge dewaterability via Fe^(2+) chelated citrate activated peroxydisulfate oxidation

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Journal of Environmental Sciences 2023年第3期125卷 223-233页

作者： Donghai Yuan Xinyu Li Siyu Xiong Jun Cui Jijiao Zhou Yingying Kou Key Laboratory of Urban Stormwater System and Water Environment Ministry of EducationBeijing University of Civil Engineering and ArchitectureBeijing 100044China Department of Environmental Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Huzhou Environmental Sanitation Management Center Huzhou 313000China

Citrate (Ct) was chosen as a typical chelator used in the Fe^(2+)-peroxydisulfate (PDS) process to improve sludge *** PDS-Fe^(2+)-Ct process exhibited better performance in sludge dewatering than PDS-Fe^(2+).Specifically,with a PDS dosage of 1.2 mmol/g VS,the molar ratio of PDS/Fe^(2+)and Ct/Fe^(2+)were 4:5 and 1:4,respectively,the capillary suction time decreased from 155.8 to 24.8sec,and the sludge cake water content decreased from 82.62%to 64.11%(-0.06MPa).The oxidation led to a reduced negative charge and a decrease in particle *** enhanced sludge dewaterability and changes of sludge properties were attributed to the decomposition of extracellular polymeric substances,and it was explored by protein,polysaccharide,3D-EEMs,and ***,the quenching experiments of radical species demonstrated that SO_(4)-·played a more important role than·OH,and its productivity was improved with the addition of ***,the reasons for the improved productivity of radicals with the addition of Ct were *** results of this study could serve as a basis for improving sludge dewatering using the PDS-Fe^(2+)-Ct process and suggest that the addition of Ct may improve the productivity of SO_(4)-·in the activation o PDS via Fe^(2+).

关键词： wastewater sludge Dewaterability Peroxydisulfate oxidation Citrate