Analysis On Water Quality Treatment Effect And Pollution Control Of ICEAS Process Sewage Treatment Plant

With the improvement of people's living standard and the rapid development of national economy,the water quality of urban sewage is becoming more and more complex,and the treatment process is changing from simple initial upgrading to directional treatment.Due to its unique geographical location and vigorous tourism,most urban sewage in Yunnan Province is mainly domestic sewage,and the amount of sewage is less than other large and medium-sized cities.According to statistics,at present,most urban sewage treatment plants in yunnan province adopt intermittent cycle delayed aeration activated sludge process?ICEAS process?to treat sewage,which is characterized by simple process,small area,large driving force of biochemical reaction,flexible operation and strong impact resistance.This paper uses an ICEAS wastewater treatment plant as an example,and counts some of its inflow and outflow water quality indicators in different months from 2015 to 2018.This paper studies the treatment status and stability of the sewage treatment plant to different pollutants,and analyzes the water quality characteristics of the inlet and outlet water of the sewage treatment plant.The characteristics of the reduction cycle of each index in the sewage treatment plant and the corresponding treatment efficiency were illustrated.In 2015-2018,the sewage treatment plant's daily sewage treatment capacity increased slowly,with an average daily sewage treatment capacity of 5551 m³/day.The influent water quality fluctuated greatly.The influent BOD₅ concentration was 137.45 mg/L,TP concentration was 5.28 mg/L,CODcr concentration was 281.6 mg/L,SS concentration was 166.86 mg/L,Las concentration was 3.86 mg/L,ammonia nitrogen concentration was 44.17 mg/L,TN concentration was 52.57 mg/L.The effect of sewage treatment is relatively stable.The effluent water quality index was stably except for the slight fluctuation of total phosphorus and total nitrogen.The monthly reduction of CODcr is between 101.75³71 mg/L,and the treatment efficiency is about 82.8%⁹7.3%.The monthly reduction of BOD₅ varies from 41.7 to 208 mg/L,and the treatment efficiency is about 90.48%.The total phosphorus treatment efficiency is 12.9%⁹4.96%.The total nitrogen treatment efficiency is between 65.68%⁹8.49%.The ammonia nitrogen treatment efficiency is above 89.7%.The sewage treatment plant's influent pollutants are mainly composed of four main components:nitrogen-containing substances,phosphorus-containing substances,pH and suspended matter.CODcr,BOD₅,ammonia nitrogen and total nitrogen were the first class principal components,while total phosphorus,pH and suspended matter were the second,third and fourth class principal components,respectively.Their contribution rates to sewage are 26.82%,18.77%,10.42%and 9.09%.The wastewater treatment plant has many effluent control factors.The first category is chroma,total nitrogen,LAS and suspended matter,accounting for 16.77%.The second category is petroleum and animal and vegetable oil,accounting for 14.39%.The third is The type is BOD₅ and COD_Cr,accounting for 14.21%.The fourth type is fecal coliform,which accounts for 12.56%,and the fifth type is pH,which accounts for 12.47%.The sewage treatment plant has a better sewage treatment effect,but the treatment capacity of different monitoring indicators shows differences.Compared with CODcr,the treatment efficiency of BOD₅ is higher.The treatment efficiency of ammonia nitrogen is higher than that of total nitrogen.The treatment efficiency of total nitrogen and total phosphorus is equivalent,but the monthly reduction of total nitrogen is higher than total phosphorus.Among all the monitoring indicators,fecal colon the number of flora is similar to the treatment efficiency of animal and vegetable oils.Comprehensively compare the sewage treatment effect of the same process sewage treatment plant.The ICEAS process has the advantages of relatively low energy consumption,low unit water treatment cost,and good environmental impact.It is suitable for small and medium-sized towns with domestic sewage as the main part and large changes in water volume in different seasons,but the treatment of N and P can still be optimized.On the whole,the sewage treatment plant has a good overall operation condition,which can meet the increased sewage water treatment due to the improvement of residents'living conditions and the increase of living production.In this paper,the change rule of the capacity of the main pollutants in the small and medium-sized urban sewage treatment plants using ICEAS process is found out,which aims to provide theoretical reference for accurately judging the operation effect of ICEAS process and the adaptability of local water quality.