Influence mechanism of electric field pretreatment on microalgae-bacteria symbionts in swine wastewater treatment
With the large-scale and intensive development of the livestock and poultry breeding industry,livestock and poul-try breeding wastewater has become the main source of agricultural non-point source pollutants.However,it contains large a-mounts of nutrients such as carbon,nitrogen and phosphorus,which are also important agricultural resources.In view of the characteristics of high chromaticity,turbidity,and high carbon,nitrogen,and phosphorus in pig wastewater,this study intro-duced electric field pretreatment to reduce the chromaticity and turbidity of wastewater.This method simultaneously promoted the growth of microalgae-bacteria symbionts,and improved the removal efficiency of pollutants in wastewater.The results showed that the electric field pretreatment can effectively remove the chromaticity and turbidity in swine wastewater,and the removal rates of chromaticity and turbidity can reach more than 90％when iron or aluminum were used as anodes.The 7 d re-moval rates of COD,TN and TP by algal symbionts in the iron and aluminum anode groups were 59.09％,61.78％,68.96％and 62.26％,62.26％,83.92％,respectively,which were better than 47.82％,59.3％and 60.48％in the untreated electric field pre-treatment group.Moreover,the chlorophyll content of iron anode group,aluminum anode group and untreated group increased from 7.63,7.32,7.37 mg·L-1 to 24.39,26.08,12.98 mg·L-1,which were 3.20,3.54 and 1.70 times that of the initial inocula-tion amount.The electric field pretreatment significantly increased the chlorophyll content in microalgae-bacteria symbionts.It showed that electric field pretreatment can effectively improve the removal effect of algae-bacteria symbionts on pollutants,ob-tain higher biomass resources,and realize the advanced treatment of wastewater and resource utilization simultaneously.
swine wastewaterelectric field treatmentmicroalgae-bacteria symbiontsresource recycling
万方数据
维普
