热水解厌氧消化工艺中污泥胞外聚合物对流变和脱水的影响  

Influence of sludge extracellular polymeric substances on rheology and dewatering in a thermal hydrolysis anaerobic digestion process

作　　者：曹秀芹[1,2] 刘溢文 付兴民 刘丰[2] 王玮 CAO Xiuqin;LIU Yiwen;FU Xingmin;LIU Feng;WANG Wei(Key Laboratory of Urban Rainwater System and Water Environment,Ministry of Education,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;School of Environment and Energy Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing city drainage Refco Group Ltd,Beijing 100124,China)

机构地区：[1]北京建筑大学城市雨水系统与水环境省部共建教育部重点实验室,100044 [2]北京建筑大学环境与能源工程学院,北京100044 [3]北京城市排水集团有限责任公司,北京100124

出　　处：《环境工程学报》2024年第3期839-847,共9页Chinese Journal of Environmental Engineering

基　　金：山西省重点研发计划项目(201803D31074);北京城市排水集团有限责任公司合作研究项目(H21380)。

摘　　要：为阐明热水解厌氧消化工艺中污泥胞外聚合物对脱水和流变的影响,选取北京市某再生水厂中热水解厌氧消化工艺的污泥为对象,通过测量污泥粒径、三维荧光及各层EPS含量研究了EPS去除对污泥流变和含固率的影响。结果表明,经过热水解预处理后的污泥,粒径相较混合污泥下降66.79%;混合污泥荧光波峰集中出现在酪氨酸类蛋白质区和色氨酸类蛋白质区,经过热水解后可溶性微生物代谢产物的荧光响应值升高,再经过厌氧消化后提升了腐殖酸区域荧光响应值;EPS的去除对于污泥流动性有重要影响。热水解污泥和热水解厌氧消化污泥去除EPS后表观黏度下降幅度较大;此外,不同的脱水方法对污泥含固率的影响也不同。混合污泥和热水解厌氧消化污泥去除S-EPS层后含固率提升366.67%和148.92%,而热水解污泥去除S-EPS层后提升效果不明显。研究结果从污泥组分和流变学角度为污泥脱水提供思路和依据。To elucidate the impact of extracellular polymeric substances(EPS)on dewatering and rheology in the hydrothermal anaerobic digestion process,sludge from a wastewater treatment plant in Beijing utilizing the hydrothermal anaerobic digestion process was selected as the subject.The study investigated the effects of EPS removal on sludge rheology and solid content by measuring sludge particle size,conducting three-dimensional fluorescence analysis,and analyzing the EPS content in each layer.The results indicated a 66.79%reduction in the particle size of sludge pretreated by thermal hydrolysis compared to that of mixed sludge.The fluorescence peaks of mixed sludge were concentrated in the tyrosine-like protein region and tryptophan-like protein region.After thermal hydrolysis,the fluorescence response values of soluble microbial metabolites increased,followed by an increase in the fluorescence response values of the humic acid region after anaerobic digestion.The removal of EPS significantly influenced sludge flowability and mobility.The apparent viscosity decreased more after EPS removal for both thermal hydrolysis sludge and thermal hydrolyzed anaerobic digested sludge.Additionally,various dewatering methods had distinct effects on the solids content of the sludge.Mixed sludge and thermally hydrolyzed anaerobically digested sludge exhibited respective increases of 366.67%and 148.92%in solids content following the removal of the S-EPS layer.However,the increase in thermal hydrolysis sludge was not as pronounced after the removal of the S-EPS layer.The study results provide insights and a foundation for sludge dewatering concerning sludge components and rheology.

关 键 词：热水解 胞外聚合物(EPS) 流变规律 污泥脱水 

分 类 号：X705[环境科学与工程—环境工程]