METHOD AND APPARATUS FOR TREATMENT OF ORGANIC WASTEWATER

PROBLEM TO BE SOLVED: To provide a method and apparatus for treating wastewater, capable of treating organic wastewater stably and efficiently, when purifying the organic wastewater, such as pig farm wastewater and sewage water, by using microalgae and activated sludge to improve the throughput per site area and to reduce the amount of aeration electric power.SOLUTION: A method for biologically purifying organic effluent flowing into a reaction vessel (a), in which a part of the organic wastewater is caused to flow into the microalgae tank (b), and in the presence of nitrifying bacteria and denitrifying bacteria, in repeated aerobic and anaerobic dark conditions, with the micro algae cultured, the microalgal suspension is flowed into the reaction tank (a), and the culture under the aerobic condition is carried out on a plane pond provided above at least one of the reaction tank (a) or the settling tank.SELECTED DRAWING: Figure 2 【課題】 本発明は、養豚廃水、下水等有機性廃水を浄化処理するに際し、微細藻類と活性汚泥を用い、敷地面積当たりの処理能力が向上するとともに、曝気電力量がより少なく、安定的かつ効率的に有機性廃水を処理できる廃水処理法及び装置を提供することを目的とする。【解決手段】 有機性廃水を反応槽ａに流入させ生物学的に浄化処理する方法において、該有機性廃水の一部を微細藻類槽ｂに流入させ、硝化菌及び脱窒菌共存下、好気明、嫌気暗条件を繰り返し、微細藻類を培養し、この微細藻類懸濁液を反応槽ａに流入させるとともに、上記好気明条件下での培養を反応槽ａ又は沈殿槽の少なくとも一方の上方に設けた平面池で行うことを特徴とする有機性廃水の処理法に構成した。【選択図】図２