微波无极紫外方法对二沉池出水的消毒研究

Disinfection for the municipal secondary effluents under microwave induced electrodeless ultraviolet irradiation

采用自制微波无极紫外连续式消毒反应器,对二沉池出水进行消毒.紫外光源为自制圆柱形无极灯,灯内充汞10mg、氩气压强666.61Pa紫外光强5.07m W/cm^2,进水流量0.072L/s,出水细菌总数2CFU/m L,大肠菌群数0.微波无极紫外作用过程中,微波破坏细胞壁细胞膜结构使蛋白质、K+等胞内物质产生渗漏,这种不可逆的破坏过程有效抑制紫外光复活现象.

The disinfection for the municipal secondary effluents was carried out with a self-made microwave induced electrodeless UV continuous disinfection reactor.The self-made cylindrical electrodeless lamp was used as UV photosource.When the electrodeless lamp was filled with Hg of 10 mg and Ar of 666.61 Pa inside,the light intensity at wavelength of 253.7nm was the strongest.Then the microwave induced electrodeless UV continuous disinfection process was established.The optimal values of operating parameters were found at a microwave power of 600 W and a HRT of 30 s,the UV light intensity,the influent flow,the total coliform count and total bacterial count of the effluent were 5.07 m W/cm^2,0.072L/s,0CFU/L and 2CFU/m L,respectively.During the process of microwave induced electrodeless UV disinfection,microwave destroyed the cell wall and cell membrane of bacterial,resulting in the leakage of intracellular substances such as protein and K＋.This irreversible destruction could effectively inhibit the photoreactivation in UV disinfection.