Experimental Study on Dairy waste water treatment by Photosynthetic bacteria

Abstract

Compared with the results of experiments,the effect of PSB on dairy waste water treatment and influencing factors were studied.The experimental results show that the removal efficiency of COD and BOD5 in dairy wastewater by PSB is much higher than the traditional methods.Under the anaerobic acidification-semi micro oxygen and semi-darkness conditions,the removal efficiency of COD is better than that under anaerobic light-illumination and aerobic darkness conditions. The optimal conditions are that the temperature is controlled between 15°C and 30°C,and the value of pH is 6.5-8.5, and the volume ration of wastewater and bacterial liquid is at 3:1,and DO in system is about 0.1-0.8mg/L.The stable water quality and higher removal efficiency of COD and BOD5 provide the basis for the further treatment of high concentration organic wastwater.