污泥热水解厌氧消化滤液处理工程溶解性有机物

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摘要以典型的污泥热水解厌氧消化滤液处理工程为对象进行现场调查.结果表明，滤液中氨氮和COD的浓度分别高达（2034±465），（4128±276） mg/L，滤液中溶解性有机物（DOM）主要是大分子难降解有机物，大于1000Da的DOM占80.6%.现有“生物预处理+两级AO-MBR”滤液处理工艺总体上可实现高效脱氮（TN去除率94.9%）和部分COD去除（69.9%）.脱氮主要依赖生物预处理单元（去除贡献率为79.9%），而DOM去除主要依赖MBR工艺的膜过滤（去除贡献率为184.7%）.膜过滤截留的DOM依次为高分子聚合物>腐植酸类物质>低分子有机酸和中性物质，出水DOM主要以腐植酸和富里酸类物质为主，且腐殖化程度增高.现有的水洗、酸洗和碱洗对膜的有机污染均有一定的清洗效果，但清洗液中DOM类型差异明显.

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关键词 ：污泥厌氧消化, 溶解性有机物(DOM), 腐殖质, 有机组分, 三维荧光光谱

Abstract：An on-site investigation was conducted to characterize dissolved organic matter (DOM) in the anaerobic digestion (AD) filtrate that was generated from a typical sludge thermal hydrolysis process (THP). The results show that the concentrations of ammonia nitrogen and COD in the filtrate were as high as 2034 (±465) and 4128 (±276) mg/L, respectively, and the DOM concentration in the filtrate was mainly macromolecular refractory organic matter, and DOM > 1000Da accounted for 80.6%. The existing "biological pretreatment + two-stage AO-MBR" filtrate treatment process could generally achieve a high-efficiency denitrification (TN removal rate of 94.9% and partial COD removal of 69.9%). Nitrogen removal relied mainly on biological pretreatment units (removal by 79.9%), while DOM removal on membrane filtration of the MBR process (removal by 184.7%). The membrane filtration intercepted DOM was in the order of high molecular polymer > humic acid substances > low molecular organic acids and neutral substances. The effluent DOM was mainly composed of humic acid and fulvic acid substances with a high degree of humification. Existing water washing, acid- and alkali washing had certain cleaning effects on organic pollution of membranes, but the types of DOM in the cleaning solution were significantly different.

Key words： anaerobic sludge digestion dissolved organic matter (DOM) humics organic component 3D-EEM

收稿日期: 2023-05-19

PACS:

X703

基金资助:国家重点研发计划项目（2021YFC3200601）；中国科学院青年创新促进会项目（2021042）

通讯作者: 魏源送,研究员,yswei@rcees.ac.cn E-mail: yswei@rcees.ac.cn

作者简介: 岳文慧(1995-),女,山西祁县人,中国科学院生态环境研究中心博士研究生,研究方向为污水生物处理技术.发表论文1篇.wenhui_yue@163.com.

引用本文:

岳文慧, 刘吉宝, 郭建宁, 魏源送, 隋倩雯. 污泥热水解厌氧消化滤液处理工程溶解性有机物[J]. 中国环境科学, 2024, 44(2): 699-707. YUE Wen-hui, LIU Ji-bao, GUO Jian-ning, WEI Yuan-song, SUI Qian-wen. Characteristics of dissolved organic matters in the treatment of the dewatering liquor of anaerobic digestion pretreated by thermal hydrolysis. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(2): 699-707.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I2/699

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