通过直链烷基苯磺酸盐促进剩余活性污泥减量：表面活性剂剂量控制胞外聚合物溶解和微生物群落演替。
Promoting waste activated sludge reduction by linear alkylbenzene sulfonates: Surfactant dose control extracellular polymeric substances solubilization and microbial community succession.
机构信息
Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada.
出版信息
J Hazard Mater. 2019 Jul 15;374:74-82. doi: 10.1016/j.jhazmat.2019.04.024. Epub 2019 Apr 4.
Short-time aerobic digestion (STAD) was proved to promote the reduction of waste activated sludge (WAS). This study systematically disclosed the influential characteristics and mechanisms of linear alkylbenzene sulfonates (LAS) dosage on the reduction of WAS in STAD system. Flow cytometer (FC) combined with SYTOX Green (SG) dye was used to differentiate extracellular polymeric substances (EPS) release and cell lysis of WAS during STAD process. LAS lower than 0.10 g/g total suspended solids (TSS) brought about EPS solubilization and the decrease of sludge floc size, and the accumulated soluble microbial products (SMP) could be biodegraded by heterotrophs. Moreover, the activity of microorganisms (denoted as specific oxygen uptake rate (SOUR)) and proportion of bacteria functional for LAS and SMP biodegradation dramatically increased, leading to a high LAS biodegradation rate (k) and increased WAS biodegradation rate (k). Even more LAS (> 0.10 g/g TSS) caused cell lysis, leading to the decreased k and k, and therefore inhibit the reduction of WAS. High WAS reduction and LAS biodegradation rate were achieved at the LAS dosage of 0.10 g/g TSS in STAD system. This study lays the foundation for improving WAS reduction by optimizing surfactant dose in STAD system.
短时间好氧消化（STAD）已被证明可促进剩余活性污泥（WAS）的减少。本研究系统地揭示了直链烷基苯磺酸盐（LAS）剂量对 STAD 系统中 WAS 减少的影响特性和机制。流式细胞仪（FC）结合 SYTOX Green（SG）染料用于区分 STAD 过程中 WAS 中细胞外聚合物（EPS）的释放和细胞裂解。低于 0.10 g/g 总悬浮固体（TSS）的 LAS 导致 EPS 溶解和污泥絮体尺寸减小，并且积累的可溶性微生物产物（SMP）可被异养生物降解。此外，微生物的活性（表示为特定需氧量（SOUR））和对 LAS 和 SMP 生物降解有作用的细菌比例显著增加，导致 LAS 高生物降解率（k）和 WAS 高生物降解率（k）。更多的 LAS（> 0.10 g/g TSS）导致细胞裂解，从而降低了 k 和 k，因此抑制了 WAS 的减少。在 STAD 系统中 LAS 剂量为 0.10 g/g TSS 时，可实现 WAS 的高减少和 LAS 的高生物降解率。本研究为通过优化 STAD 系统中的表面活性剂剂量来提高 WAS 减少奠定了基础。
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