LIWei,QUANHai-xia,ZHAOYuan.Treatment of Filtrate from Sludge Thermal Hydrolysis-Anaerobic Digestion in Municipal Wastewater Treatment Plant[J].China Water & Wastewater,2025,41(22):117-122.
利用城镇污水处理厂处理污泥热水解-厌氧消化滤液
- Title:
- Treatment of Filtrate from Sludge Thermal Hydrolysis-Anaerobic Digestion in Municipal Wastewater Treatment Plant
- Keywords:
- municipal wastewater treatment plant; sludge; thermal hydrolysis-anaerobic digestion; filtrate
- 摘要:
- 污泥热水解-厌氧消化产生的滤液具有高氨氮、高COD的特点，主要处理技术有厌氧氨氧化、短程硝化反硝化及传统生物处理等。研究了利用大中型污水处理厂处理污泥热水解-厌氧消化滤液的可行性，污泥热水解-厌氧消化滤液对进水水质的主要影响是增加进水氨氮和总氮，影响生物脱氮效果，增加污水处理厂的脱氮成本。试验表明，氨氮在设计停留时间内可以有效去除，但COD降解较为缓慢，需要控制热水解-厌氧消化滤液的处理量。工程实践表明，若控制好污水处理厂的进水量和滤液处理量比例，出水水质可以稳定达标。需要重点关注：①利用传统污水处理厂处理污泥热水解-厌氧消化滤液，成本增加0.053元/m3，通过控制污水处理量与滤液的比例、精细化调控、选择夏季等有利时期可以将成本增加降至0.031元/m3；②污泥热水解-厌氧消化滤液会提高污水处理厂出水COD，当处理水量与滤液比例控制在300∶1以上时可以保障出水COD稳定达标。
- Abstract:
- The resulting digestion filtrate is characterized by high ammonia nitrogen and high COD levels, and can be treated using techniques such as anaerobic ammonium oxidation (Anammox), shortcut nitrification-denitrification, and conventional biological processes. This study investigated the feasibility of treating thermal hydrolysis-anaerobic digestion (TH-AD) filtrate in large and medium-sized municipal wastewater treatment plants (WWTPs). The primary impacts of introducing TH-AD filtrate on the influent quality are increased ammonia nitrogen and total nitrogen loads. This adversely affects biological nitrogen removal efficiency and necessitates additional denitrification costs for the WWTP. Experimental results demonstrated that ammonia nitrogen can be effectively removed within the designed hydraulic retention time; however, COD degradation is relatively slow, requiring strict control over the TH-AD filtrate treatment volume. Engineering practices confirmed that controlling the ratio of the WWTP inflow rate to the filtrate treatment rate ensures stable compliance of the effluent quality. Key points requiring attention include:①Treating TH-AD filtrate in conventional WWTPs increases operational costs by approximately 0.053 yuan/m3. This cost increase can be reduced to approximately 0.031 yuan/m3 through measures such as optimizing the ratio of wastewater inflow to filtrate volume, refining process control (fine-tuning), and selecting favorable periods like summer. ②TH-AD filtrate elevates the effluent COD concentration of the WWTP. Ensuring stable effluent COD compliance requires maintaining a ratio of the WWTP inflow rate to the filtrate treatment rate above 300∶1.
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