Development of A High Rate Advanced Municipal Sewage Treatment System with Coagulation-Foam Separation Method as a Pretreatment Process

城市污水和有机废水一般采用生物处理方法，如活性污泥系统。但污水处理周期较长，对总氮（TN）和总磷（TP）的去除率不够。近年来，为了防止环境水的富营养化，需要能在短时间内去除TN、TP、悬浮物、BOD和TOC并易于维护的处理系统。我们开发了以下系统作为一个高速率和先进的污水处理系统。该系统由混凝-泡沫分离过程（水力停留时间HRT:0.15hr）、BOD去除过程（HRT:1.5hr）、硝化过程（HRT:1.5hr）和反硝化过程（HRT:3hr）组成。BOD去除工艺、硝化工艺和反硝化工艺均采用NKK公司生产的Bio-tube培养基。总治疗时间为6.15小时。宫崎市木花污水厂沉淀池出水处理后水质（去除率）为：浊度：5.11TU(89.3%), SS:6.2mg/L(84.2%), BOD:7.1(91.0%), TOC:4.5mg/L(89.3%), TN:2.78mg/L(91.3%), TP:0.14mg/L（92.3%）。其去除率优于我国近年来采用的高级污水处理系统。整个治疗周期只有系统的1/3。因此，本研究开发的先进城市污水处理系统对于处理城市污水和有机废水是非常有效和有用的。

Municipal sewage and organic waste water have been treated by biological treatment methods such as activated sludge system in general. But, it takes so long period to treat the sewage and the removability of total nitrogen(TN) and total phosphorus(TP) is not sufficient. In resent year, the treatment system which can remove TN, TP, suspended solids, BOD and TOC in short period and its maintenance easy are required to prevent eutrophication of environmental water. We developed the following system as an high rate and advanced sewage treatment system. The system consists of the coagulation-foam separation process(hydraulic retention time HRT:0.15hr), BOD removal process (HRT:1.5hr), nitrification process (HRT:1.5hr), and de-nitrification process(HRT:3hr). The BOD removal process, nitrification process, and de-nitrification process contain the media of Bio-tube produced by NKK Co.. Total treatment period is 6.15hr. The treated effluent quality (and removal %) of Kibana sewage plant in Miyazaki City effluent of sedimentation tank was turbidity:5.11TU(89.3%), SS:6.2mg/L(84.2%), BOD:7.1(91.0%), TOC:4.5mg/L(89.3%), TN:2.78mg/L(91.3%), and TP:0.14mg/L(92.3%). These removability are better than the advanced sewage treatment system which is used in our country resent years. And total treatment period is only 1/3 of that system. Therefore, the advanced municipal sewage treatment system which was developed in this research is considered to be very effective and useful to treat municipal sewage and organic wastewater.