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首页> 外文期刊>Chemical engineering journal >The role of extracellular polymeric substances on carbon capture in a high rate activated sludge A-stage system
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The role of extracellular polymeric substances on carbon capture in a high rate activated sludge A-stage system

机译：细胞外聚合物物质在高速速率活性污泥A级系统中碳捕获的作用

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This paper quantifies the effect of varying solids retention time (SRT), hydraulic retention time (HRT) and dissolved oxygen (DO) concentrations on extracellular polymeric substances (EPS) production and subsequently effluent quality, carbon capture (bioflocculation) and carbon redirection (settling) in a high rate activated sludge A-stage system treating domestic wastewater. Two pilot-scale A-stage reactors were setup with HRTs of 30 and 60 min. Cascade DO control was used to maintain 3 DO set-points of 0.5, 1.0 and 1.5 mg/L. A mixed liquor suspended solids (MLSS) concentration of 3000 mg/L was maintained and the waste activated sludge (WAS) flow was varied to achieve SRTs of 0.28 and 0.56 day. EPS fractions and the protein and polysaccharide concentrations of the mixed liquor were measured. Operation at the 0.56 day SRT and 1.0 mg/L DO resulted in the highest total suspended solids (TSS), total COD (tCOD), particulate COD (pCOD), and colloidal (cCOD) removal. The best overall performance in terms of bioflocculation (cCOD removal) and carbon capture (percent COD in the WAS) occurred at the 0.56 day SRT and coincided with decreasing total EPS concentrations but the settling characteristics of the sludge were better at the 0.28 day SRT. Overall, low correlations were found between EPS production and system performance. It is likely that at the high loading rate of the A-stage system, EPS production did not play a major role compared to the influence of operating parameters on effluent quality, carbon capture and redirection. (C) 2017 Elsevier B.V. All rights reserved.
机译：本文量化了不同固体保留时间（SRT），液压保留时间（HRT）和溶解氧（DO）浓度对细胞外聚合物物质（EPS）生产以及随后的流出质量，碳捕获（生物絮凝）和碳重定向（沉降）在高速激活的污泥A级系统中处理国内废水。使用30至60分钟的HRT设置了两种先导级A级反应器。 Cascade DO控制用于维持3.0.5,1.0和1.5 mg / L的3次设定点。保持混合液悬浮固体（MLS）浓度为3000mg / L，并改变废物活性污泥（IS）流动以实现0.28和0.56天的SRT。测量EPS级分和蛋白质和多糖浓度的混合液。 0.56天的操作SRT和1.0mg / L导致总悬浮固体（TSS），总鳕鱼（TCOD），颗粒鳕鱼（PCOD）和胶体（CCOD）去除。在0.56天的SRT中发生生物絮凝（CCOD去除）和碳捕获（CCCOD去除）和碳捕获（COD百分比）的总体性能，并恰逢总EPS浓度，但污泥的沉降特性在0.28天的SRT中更好。总体而言，EPS生产和系统性能之间发现了低相关性。它可能在A级系统的高负荷率下，与运行参数对流出质量，碳捕获和重定向的影响相比，EPS生产没有发挥重要作用。 （c）2017 Elsevier B.v.保留所有权利。

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