AN ANAEROBIC FLUIDIZED BED BIOREACTOR SYSTEM FOR AN ADVANCED WASTEWATER TREATMENT

一种新的、简单的污水处理系统，没有传统的一次澄清器，开发了一种先进的废水处理系统。它由厌氧流化床生物反应器（AFPB）和好氧生物处理工艺组成。同时考察了悬浮物、有机物、磷和氮化合物的去除效果。得到以下结果：(1)在AFPB生物反应器中，使用少量聚合氯化铝和弱阴离子聚合物使悬浮物、胶体物质和磷凝固，生成大粒径污泥球团，并迅速从系统中分离出来。(2)丝状细菌Beggiatoa sp.对高密度污泥球团的形成起着重要作用。(3) AFPB生物反应器不仅具有分离悬浮物和磷类结块的物理功能，而且具有去除有机物和氮化合物的生物功能。通过将好氧生物处理过程中澄清、硝化后的出水回用到AFPB生物反应器中，有效利用进水中的悬浮物和可溶性有机物进行生物反硝化，实现稳定的脱氮。(4)本研究提出的工艺可以在5h的极短停留时间内同时去除COD、悬浮物、氮、磷等多种污染物，即使在低至10 C的水温下也能产生高质量的出水。(5) AFPB生物反应器系统可用于污水污泥脱水滤液等高强度废水处理。

A new, simple wasterwater treatment system without the conventional primary clarifier was developed for an advanced waste water treatment system. It consisted of an anaerobic fluidized pellet bed bioreactor (AFPB bioreactor) followed by an aerobic biological treatment process. Simultaneous removal of suspended solids, organic matter, phosphorus and nitrogenous compounds was examined. The following results were obtained :(1) In the AFPB bioreactor, suspended solids, colloidal matter and phosphorus were coagulated using a small amount of polymerized aluminum chloride and weak anonic polymers to generate large sized sludge pellets which separated rapidly from the system.(2) A filamentous bacteria Beggiatoa sp.was greatly responsible for the formation of the sludge pellet with high density.(3) The AFPB bioreactor functioned not only physically to separate suspended solids and phosphorus compounds as agglomerates, but also biologically to remove organic substances as well as nitrogenous compounds. Suspended and soluble organic substances in the influent wastewater were effectively used for biological denitrification by recycling the clarified, nitrified effluent from the aerobic biological treatment process to the AFPB bioreactor, and a stable nitrogen removal could be accomplished.(4) The process proposed in this study could remove a variety of pollutants such as COD,suspended solids, nitrogen and phosphorus components simultaneously at the quite short retention time of 5h, producing good quality effluent even at water temperatures as low as 10ﾟC.(5) The AFPB bioreactor system could be applied to high strength of waste water such as filtrate from dehydration of sewage sludge.