One-year operation of a 20-L submerged anaerobic membrane bioreactor for real domestic wastewater treatment at room temperature: Pursuing the optimal HRT and sustainable flux
One-year operation of a 20-L submerged anaerobic membrane bioreactor for real domestic wastewater treatment at room temperature: Pursuing the optimal HRT and sustainable flux
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DOI：
10.1016/j.scitotenv.2021.145799
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发表时间：
2021-02-20
影响因子：
9.8
通讯作者：
Li, Yu-You
中科院分区：
文献类型：
--
作者：
Ji, Jiayuan;Chen, Yujie;Li, Yu-You
采用20 L中空纤维一体式厌氧膜生物反应器（SAnMBR）处理真实的生活污水，温度为25 ℃，水力停留时间（HRT）为4 ~ 12 h。在一年的运行中，通过有机物去除率、产气量、污泥产量和过滤性能来评价该工艺的性能。对于HRT范围为6和12 h之间，AnMBR表现出良好的有机物去除效率与化学需氧量（COD）和生化需氧量（BOD）的去除效率约89%和93%，分别。沼气产率为0.26 L-气体/g-COD进料，甲烷含量约为80%，污泥产率为0.07-0.11 g-VSS/g-COD进料。在HRT为4 h时，随着污水处理能力和有机负荷的提高，沼气产量降低（0.17 L-gas/g-CODfed），污泥产量增加（0.22 g-VSS/g-CODrem）。由于膜过滤过程的有效分离效果，在HRT为4 h时，有机物的去除性能（COD 84%和BOD 89%）是可以接受的。根据COD平衡分析，HRT为4 h时，在OLR为2. 05 g-COD/L-reactor/d的条件下，生物降解能力不足，导致产气量低，污泥产量高。根据亨利定律的理论计算表明，当操作温度为25 ℃时，沼气中理想的甲烷含量应为82-85%。为了实现高通量和可持续运行的AnMBR，混合液悬浮固体（MLSS）和气体鼓泡速度（GSV）对过滤性能的影响进行了分析。临界通量随GSV从24.2增加到174.3 m/h而增加，但随MLSS浓度从8.2增加到20.2 g/L而降低。因此，通过有效地控制GSV和MLSS，将污泥的结垢速率降低到0.8- 1.2kPa/d，在0.34m/d的通量下可实现可持续运行。(C)2021爱思唯尔有限公司版权所有。
A 20 L hollow-fiber submerged anaerobic membrane bioreactor (SAnMBR) was used to treat real domestic wastewater at 25 degrees C with hydraulic retention times (HRTs) ranging from 4 to 12 h. The process performance was evaluated by organic removal efficiency, biogas production, sludge yield, and filtration behaviors during one-year's operation. For HRTs ranging between 6 and 12 h, the AnMBR showed good organic removal efficiency with chemical oxygen demand (COD) and biochemical oxygen demand (BOD) removal efficiencies of about 89% and 93%, respectively. The biogas yield was 0.26 L-gas/g-CODfed, with approximately 80% methane content, and the sludge yield was 0.07-0.11 g-VSS/g-CODrem. While at an HRT of 4 h, with the higher wastewater treatment capacity and organic loading rate (OLR), the biogas production was lower (0.17 L-gas/g-CODfed), and the sludge production was higher (0.22 g-VSS/g-CODrem). The organic removal performance (COD 84% and BOD 89%) at HRT of 4 h was acceptable due to the effective separation effect of the membrane filtration process. According to COD balance analysis, the low biogas yield and high sludge yield at HRT of 4 h were due to insufficient biodegradation under an OLR of 2.05 g-COD/L-reactor/d. Theoretical calculations based on Henry's law indicate that the ideal methane content in the biogas should be 82-85% when the operational temperature was 25 degrees C. To achieve a high flux and sustainable AnMBR operation, the impact of mixed liquor suspended solid (MLSS) and gas sparging velocity (GSV) on the filtration performance was analyzed. The critical flux increased with increase in the GSV from 24.2 to 174.3 m/h, but decreased with increase in the MLSS concentration from 8.2 to 20.2 g/L. Therefore, decreasing fouling rate to 0.8-1.2 kPa/d by efficiently controlling GSV and MLSS, sustainable operation could be achieved at a flux of 0.34 m/d. (C) 2021 Elsevier B.V. All rights reserved.