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《Environmental Pollution & Control》 2014-10
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Humification characteristics of excess sludge as influenced by earthworm-microorganism interactions

SHI Pengfei;XING Meiyan;QI Wensheng;NIE Jing;Key Laboratory of Yangtze River Water Environment,Ministry of Education,State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University;Shanghai Municipal Sewerage Co.,Ltd.;  
The humic acid(HA)in excess sludge,which produced in biological wastewater treatment process,was extracted by alkaline isolation and Adan method(organic solvent and acid hydrolysis),seperatly.The properties of two extracted HA was characterized by elemental analysis,IR spectra and excitation-emission matrix fluorescence spectra respectively.The results showed that HA isolated by Adani method had lower content of non-humus components and it could better represent the humification characteristics of excess sludge.So,applying the Adani method to extract the HA in influent sludge(IS)and effluent sludge(ES)of vermifilter,the effect of earthworm-microorganism interactions on humification characteristics of excess sludge was investigated.Elemental analysis,E4/E6 values and excitation-emission matrix fluorescence spectra showed that the protein contents in IS was effectively degraded,so HA in ES(ES-HA)had low protein contents and high humic substances contents,beside,ES-HA had bigger molecular weight and higher degree of polycondensation,indicating that the humification degree of ES was markedly improved.
【Fund】: 国家自然科学基金资助项目(No.51109161);; 高等学校博士学科点专项科研基金资助项目(No.20110072120029)
【CateGory Index】: X703;X17
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