Development of a energy-producing, high-rate wastewater treatment system, it is decreasing of production of greenhouse effect gas and excess sludge

我们提出了由UASB反应器作为厌氧前处理单元和好氧后处理单元组成的污水处理系统。好氧单元由滴滤式反应器和流态化反应器组合而成，用于净化UASB出水。在某城市污水处理厂，采用7.18m~3中试系统进行了原水进水250天以上的可行性试验。将一部分滴滤池出水循环到UASB，作为硫酸盐来源，改善了系统的最终出水水质。在整个系统的水力停留时间为12h时，进水BOD由303 mg/L下降到UASB出水中的150 mg/L和好氧单元出水中的13 mg/L。小瓶活性批式试验表明，运行90d后，UASB污泥中BOD氧化的主要电子流完全从产甲烷转向硫酸盐还原。

We have proposed sewage treatment system which consists of an UASB reactor as an anaerobic pre-treatment unit and an aerobic post-treatment unit. The aerobic unit is composed of a combination of a tricking filter reactor and a fluidized bed reactor in order to polish up the UASB effluent. The feasibility test feeding raw sewage for over 250 days was carried out with 7.18 m^3 pilot plant system at a municipal sewage treatment plant. Circulation of a part of the tricking filter effluent stream to the UASB as supplying a sulfate source improved the final effluent quality of the system. Influent unfiltered BOD of 303 mg/L decreased to 150 mg/L in UASB effluent and subsequently to 13 mg/L in the aerobic unit effluent for 12 hours in the HRT of whole system. Vial-activity batch tests suggested that the main electron flow for BOD oxidation in the UASB sludge shifted completely from methane production to sulfate reduction after 90 days operation.