Study On The Effect Of Circular Caohai Township Sewage Integrated Oxidation Ditch And MICEAS Process

This study focused on the effect of circular integrated oxidation ditch and MICEAS process on the sewage treatment in the town.There were still few literatures on the round integrated oxidation ditch,and MICEAS process and their operating parameters,and the two technologies were also less applied in China.Based on the comparative study of the two sewage treatment processes,the influence of operation parameters on the circular integrated oxidation ditch and MICEAS process were obtained later,and the best operation parameters of the two process were also obtained.The"circular integrated oxidation ditch"and"MICEAS"centralized sewage treatment technology provide reference and suggestions for the popularization and application of township sewage treatment plants.The experiment was divided into three stages.The first stage was to detect the water quality and water inflow of the two processes.The second stage was to study the removal effect of different aeration modes on the new oxidation ditch and discuss the optimum HRT of the integrated oxidation ditch process and the sludge reflux ratio.The third stage was to analyze the influence of DO and volume ratio on MICEAS process.The performance of the effect of the integrated oxidation ditch process on the treatment of COD,TP and TN was very good.The removal rates were 89.51%,61.82%and 63.92%respectively.The effluent was 11.33mg/L,0.43mg/L and 10.9mg/L respectively.The treatment effect of MICEAS on NH₃-N was effective,and the removal efficiency was 98.95%,while the effluent concentration is 0.23 mg/L.In the process of integrated circular oxidation ditch,the removal rate of COD,NH₃-N,TN and TP by microporous aeration process was 87.9%,75.23%,62.63%and 85.01%respectively,and the effluent was 13.36mg/L,3.07mg/L,11.31mg/L,0.32mg/L respectively.The microporous aeration process performanced better than the surface aeration process.In the circular integrated oxidation ditch project,the microporous aeration process had obvious advantages of nitrogen and phosphorus removal compared with the surface aeration process.When HRT was 16h and sludge recycle ratio is 30%,it had the best effect of removing pollutants.In the MICEAS process,the DO value at the end of the aeration stage was controlled from 2.5 to 3 mg/L,and the optimal removal efficiency of nitrogen and phosphorus can be achieved by the volume ratio of the processing unit at 0.75.