Study On Biodegradation Of Sweetened Bean Paste Wastewater Under Anaerobic Acidification And Aerobic Biooxidation Condition

Based on the character of sweetened bean paste wastewater with high COD_Cr,high color,and the problem of return to high colority in the wastewater treatment engineering, A lab static state treatment for the wastewater experimnent was carried under different dimension burthen of the anaerobic acidification and aerobic biooxidation condition.The results showed that the rate of COD and color under anaerobic acidification condition is 60% and 35%;but the problem of color lightening in anaerobic acidification and darkening in aerobic biooxidation ,which results in a synchronous degradation of COD and color.The study on the effect of using metal microelement,using a great deal of iron ,and adding the technics of biological aerated filter after biological oxidation filter.The results showed that : Synchronous degradation of COD and color can be achieved and repeated color transform can be avoided effectively in the set of 2# and 3#, which adding a great deal of iron;but tehe set of only adding metal microelemen ,synchronous degradation of COD and color can be achieved on a certain extent and repeated color transform can't be avoided effectively;biological aerated filter ,which adding spongy iron and argil grain , synchronous degradation of COD and color can be achieved and repeated color transform can be avoided effectively , the average effluent concentrition of COD is 99.2¹82 mg/L , SS is 20mg/L, color is about 40 times.