LIANJie,ZHUOYang,YANGPei-zhen,et al.Start-up of UASB for Treating Thermal Hydrolyzed Filtrate of Excess Sludge with High Solid Content[J].China Water & Wastewater,2023,39(5):114-120.
UASB处理高含固污泥热水解滤液启动特性
- Title:
- Start-up of UASB for Treating Thermal Hydrolyzed Filtrate of Excess Sludge with High Solid Content
- Keywords:
- UASB; exces sludge with high solid content; thermal hydrolyzed filtrate; organic loading rate
- 摘要:
- 针对高含固剩余污泥热水解滤液采用UASB处理的启动特性，开展连续运行试验（HRT为26~7.8 d）并分析启动过程中有机物去除率、甲烷产量的变化。结果表明，COD去除率及甲烷产率随着有机负荷的提升而增加，当HRT为7.8 d时COD去除率可达（65.92±2.44）%。相比于COD去除率，系统启动过程中更应关注甲烷产量的变化。当HRT为7.8 d时，出水氨氮浓度及pH分别为（2 532.37±129.93） mg/L、8.02±0.28。负荷提升过程中，应更注重氨抑制风险。由于沼气产量及进水量较低，系统启动初期可采用间歇进水并增设内回流的方式增加UASB内的上升流速。
- Abstract:
- To investigate the start-up characteristics of UASB for treating thermal hydrolyzed filtrate of excess sludge with high solid content, a continuous running test (HRT ranging from 26 days to 7.8 days) was carried out and the changes of organic matter removal rate and methane yield during the start-up process were analyzed. The COD removal rate and methane yield rate increased with the organic loading rate. When the HRT was 7.8 days, the COD removal rate reached (65.92±2.44)%. Compared with COD removal rate, more attention should be paid to the change of methane yield during system start-up. When the HRT was 7.8 days, the effluent ammonia nitrogen and pH were (2 532.37±129.93) mg/L and 8.02±0.28, respectively. In the process of load increase, more attention should be paid to the risk of ammonia inhibition. Due to the low biogas yield and influent volume, intermittent feeding and internal reflux can be adopted to increase the up-flow velocity in UASB at the initial start-up stage.
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