Park Chul, Chon Dong-Hyun
Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA 01003, USA.
Water Environ Res. 2015 Dec;87(12):2090-7. doi: 10.2175/106143015X14362865227355.
High-rate anaerobic side-stream reactor (ASSR) processes were developed to minimize excess sludge production during wastewater treatment. New ASSRs were operated in 2.5-day solids retention time (SRT), much shorter than 10-day SRT used by the commercial sludge reduction process. The 2.5-day was selected based on literature review and preliminary studies, showing that maximum solublization of key floc components, such as divalent cations, extracellular polymeric substances (EPS), and protease, occur within 2 to 3 days of anaerobic digestion. The laboratory reactor study showed that 2.5-day ASSR systems produced approximately 60 and 20% less sludge than the control (no ASSR) and the 10-day ASSR, respectively. The experimental systems showed acceptable effluent quality, despite minimal sludge wastage. This was possible because sludge EPS were continuously released/degraded and regenerated as sludge underwent recirculation between ASSR and the aerobic basin. The results supported that the activated sludge process incorporating small ASSRs significantly decrease the production of excess sludge during wastewater treatment.
高速厌氧侧流反应器（ASSR）工艺的开发旨在尽量减少废水处理过程中剩余污泥的产生。新型ASSR在2.5天的固体停留时间（SRT）下运行，远短于商业污泥减量工艺所采用的10天SRT。2.5天的时间是根据文献综述和初步研究选定的，研究表明关键絮凝成分（如二价阳离子、胞外聚合物（EPS）和蛋白酶）在厌氧消化的2至3天内实现最大程度的溶解。实验室反应器研究表明，2.5天的ASSR系统产生的污泥分别比对照（无ASSR）和10天的ASSR少约60%和20%。尽管污泥排放量极少，但实验系统的出水水质仍可接受。这是因为随着污泥在ASSR和好氧池之间循环，污泥EPS会持续释放/降解并再生。结果表明，结合小型ASSR的活性污泥工艺可显著减少废水处理过程中剩余污泥的产生。
