污水处理排放水对小流量河流水体生态的影响

Effects on ecologic situation of small flow water by discharge of two-stage treated wastewater

针对日本国鬼怒河流域小流量河流,通过对河床上附着生物膜的组成、底栖生物、细菌活性分析和AGP试验,研究了污水厂二级处理排放水对小流量河流生态的影响.研究表明,当污水厂二级处理排放水占河流流量比例较大时(研究河流所占比例为35%),同样会引发河流富营养化和影响河流水体的生态.因此,从保护水环境及其生态考虑,有必要对污水进行深度处理.

In this paper, the authors studied the ecologic situation of a small flow water system which was influenced by the discharge of two-stage treated wastewater by analyzing components of biofilm, benthos, activity of bacteria on the stream bed and AGP testing. All the results demonstrate that if the discharge of two-stage treated wastewater is much （ it＇s flow rate of 35% of river） , it will result in the eutrophic situation happening and ecologic characteristics are changed. Therefore it is necessary that wastewater should be further treated after two-stage treatment to protect the water environment and ecology.