进料制度对厌氧序批式膜生物反应器处理城市下水道废水性能的影响

Sachin Kumar Tomar, Aditi Deshpande, Sourbh Dhiman, Ravi Karan Singh, Malini Balakrishnan
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摘要

这项研究评估了一种配备废物基陶瓷膜的厌氧序批式膜生物反应器(AnSBR-MBR),用于处理低浓度的实际排水废水。比较了两种进料方式,即沉淀进料(第 1 阶段)和混合进料(第 2 阶段)。研究了生物性能(化学需氧量(COD)和磷酸盐(PO43-)去除率)和过滤性能(总悬浮固体(TSS)去除率和膜堵塞)。此外,还评估了反应器在固体含量、污泥沉降行为和细胞外高分子物质(EPS)方面的特性。在第一阶段,沉淀进料(不含颗粒有机物)导致挥发性悬浮固体(VSS;0.23 ± 0.15 g/L)含量低,从而导致 COD 去除率低(28.38 ± 8.14%)。在第 2 阶段的混合进料系统中,由于颗粒物质中的有机物含量增加,VSS 增加(1.82 ± 0.60 g/L),这给微生物提供了额外的食物,导致 COD 去除率增加(47.42 ± 2.81%);由于 EPS 含量较低,该阶段的膜堵塞也较低。第二阶段的 TSS 去除率(96.72 ± 3.26%)也略高于第一阶段(90.48 ± 8.14%)。这项研究表明,AnSBR-MBR 在处理含有悬浮固体的混合排水废水时性能更优越,因此不建议使用预沉淀法。
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Impact of feeding regimes on the performance of anaerobic sequencing batch membrane bioreactor treating wastewater from an urban drain
This work evaluated an anaerobic sequencing batch membrane bioreactor (AnSBR-MBR) equipped with waste-based ceramic membranes for treating low-strength real drain wastewater. Two feeding regimes, viz. settled feed (Phase 1) and mixed feed (Phase 2) were compared. The biological performance (chemical oxygen demand (COD) and phosphate (PO43-) removal) and filtration performance (total suspended solids (TSS) removal and membrane fouling) were investigated. The reactor characteristics in terms of solids content, sludge settling behaviour, and extracellular polymeric substances (EPS) were also assessed. In Phase 1, the settled feed (with the absence of particulate organic matter) resulted in low volatile suspended solids (VSS; 0.23 ± 0.15 g/L), causing low COD removal (28.38 ± 8.14%). In the mixed feed regime in Phase 2, VSS increased (1.82 ± 0.60 g/L) due to the organic content in the particulate matter, which gave microorganisms additional food, resulting in increased COD removal (47.42 ± 2.81%); this phase was also characterised by lower membrane fouling because of the lower EPS content. Marginally higher TSS removal was obtained as well in Phase 2 (96.72 ± 3.26%) than in Phase 1 (90.48 ± 8.14%). This work demonstrates that AnSBR-MBR performance is superior with mixed drain wastewater containing suspended solids and thus pre-settling is not recommended.
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