活性污泥丝状膨胀的防止和克服方法

活性污泥丝状膨胀是采用活性污泥法的污水处理厂运行中经常出现的严重问题．通过大量的试验和调查证实，导致活性污泥丝状膨胀的主要因素是进入曝气池的污水水质（如含大量溶解性易降解合联有机物及硫化物等）促使丝状细菌过度生长所致，而污泥负荷率、曝气池的运行方式、溶解氧浓度和污水的碳氮比等是提供丝状菌生长的环境条件，防止和克服污泥丝状膨胀的有效方法是改变进入曝气池的污水水质．通过调整工艺采用简单、有效的方法改变水质，如：①取消初沉淀池或采用短停留时间的初沉池；②采用两级活性污泥法（例如A－B法等）；③在曝气池的前端设置部分填料，将曝气池的一部分改为生物接触氧化池；④采用序批式间歇活性污泥（SBR）法，以上措施可防止和克服活性污泥丝状膨胀．

Method on Prevention and Overcoming of Activated Sludge Filamentous Bulking

The achvated sludge filamentous bulking is a serious problem appedring often in operahon of wastewater treatment plant. A large number of experiments and inveshgations certify that the influent wastewater quality of aerahon tank is the major factor in producing activated sludge filamentous bulking, and results in filaxnentous microorganism's excessive growth. The sludge load rate, the operation way of aeration tank and dissolved oxygen and m (C): m (N)Provide an environmental condition of filamentous microorganism's growth. Therefore, to prevent and overoome filamentous bulking, the influent wastetvater quality must be changed. We can regulate treatment craft, and use simple and effective method to achieve the purpose of preventing and overoodring activated sludge filamentous bulking, e. g.We can cancel primap sedimentary tank, shorten seddrientary time of primary sedimentary tank, increase SS of aeration tank, or use two step (A-B) activated sludge process, or use SBR process. The forve measures can prevent and overcome activated sludge filamentous bulking.