Study On The Treatment Of Livestock And Poultry Wastewater By Electric Field Pretreatment Coupled With Algae And Bacteria Symbiont

In recent years,wastewater treatment technology based on microalgae has received more and more attention,but the high color,high turbidity,and high salt water characteristics of pig farm wastewater have restricted the treatment effect and growth of microalgae.In order to solve this problem,this research considers the idea of combining electric field treatment technology with microalgae wastewater treatment to carry out advanced treatment of the anaerobic digestion effluent of pig farm wastewater.However,from the perspective of wastewater treatment,the symbiotic system of algae and bacteria is better than the treatment effect of a single microalgae system,and it is expected to obtain a better effect of nitrogen and phosphorus removal.This paper aims to construct the electric field pretreatment coupled with algae-bacterial symbiont wastewater treatment technology,and develops the effect of 4 different electrode materials on the electric field treatment effect of pig-raising wastewater and the subsequent effect of microalgae on the further advanced treatment of pig-raising wastewater.Secondly,the electrolysis parameters are carried out.After further optimization,the final focus is to explore the effects of three different microbial systems,microalgae,microalgae-activated sludge,and activated sludge on the effect of advanced treatment of pig wastewater after electric field pretreatment,and construct an algae-bacterial symbiosis system.The main results are as follows:The stainless steel group and aluminum group showed good removal effects on chromaticity and turbidity(92.44% and 83.72%;99.83% and 99.74%).In addition,the treatment effect and growth of microalgae wastewater after electric field pretreatment were significantly improved.The final biomass of the stainless steel group and the aluminum group reached 2.22,1.89 g·L-1,respectively,which was much higher than the control raw water group.The concentration of chlorophyll a in the stainless steel group and aluminum group increased to 11.48 times and 9.89 times that of inoculation,respectively.Through the orthogonal experimental treatment of the pig farm wastewater through the electrolysis conditions,the 9 groups of orthogonal experiments have a significant effect on the removal of COD and phosphate in the biogas slurry and the removal of nitrogen in the biogas slurry in the electric field pretreatment stage.Not ideal.The best removal effects on COD,TN and TP were 63.95%(group 6),12.70%(group 8),and 96.98%(group 8),respectively.It is worth noting that in terms of biomass accumulation in the subsequent microalgae treatment,the microalgae biomass in the biogas slurry of the 8th group finally reached 1.27g·L-1.Similarly,the8 th group obtained the highest leaf green a of 7.14 times at the time of inoculation.content.In the end,the best electrolysis conditions are comprehensively considered:the electrolysis voltage is 30 V,the electrolysis time is 20 min,and the pole piece spacing is 2cm.Electric field treatment has a good removal effect on the color and turbidity of pig-raising biogas slurry,with removal rates of 90.43% and 99.69% respectively;electric field treatment has a promoting effect on the subsequent microbial treatment,and the microbe has a removal effect on total nitrogen and total phosphorus.The highest are 70.65% and 67.30% respectively.In addition,the microalgae-activated sludge symbiosis system is superior to a single microbial system in terms of pollutant removal effect and growth status.The final chlorophyll a content of the microalgaeactivated sludge system was 7.65 times that of the inoculation,and the activated sludge biomass was 1.51 times that of the inoculation,which was much higher than that of the single microbial system.