Determination Measurement and Evaluation of Aeration Performance of Fine-Pore Aeration System for AAO Process in Summer and Winter
A municipal wastewater treatment plant(WWTP)in Shanghai was taken as the research object.The pollutant removal effect and aeration system performance were systematically measured and evaluated through field tests along the aerobic tank in summer and winter.Results showed that the effluent quality in both summer and winter met the first class A discharge standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002),because the hydraulic load was less in winter than in summer and the aerobic tank had longer hydraulic residence time and adequate aeration,which offset the negative effect of low temperature on nitrification.Compared with those in summer,the total oxygen demand of the biological treatment process in winter was higher and the oxygen transfer efficiency of the fine-pore aeration system was lower,resulting in a higher required air supply and lower aeration efficiency.The oxygen supply was 38.99%and 7.07%higher than the oxygen demand in summer and winter,respectively,with a higher energy saving potential in summer.The pollutant concentration of aerobic tank gradually decreases along the tank,and the pollutant concentration at the end remains almost the same,while the dissolved oxygen concentration at the end was much higher than the front end,which meant that the oxygen supply at the end was not used for CODCr oxidation and ammonia oxidation,therefore over-aeration occurs,so the air supply at the end of aerobic tank can be reduced.
AAO processfine-pore aerationaeration energy consumptionoxygen transfer efficiencyoff-gas test
国家科技期刊平台
NSTL
万方数据
维普
