污水处理厂反硝化深床滤池跌水复氧控制措施的工程实践OACSTPCD

Deep-bed denitrification filters are generally open-air tanks.During the process of wastewater falling,full contact with the atmosphere could increase the dissolved oxygen in the filter,which is a major cause of low carbon source utilization in deep-bed denitrification filters.A wastewater treatment plant(WWTP)in the Daqing River was selected as the research object to carry out an engineering study on the control of waterfall reoxygenation in a deep-bed denitrification filter.By detecting changes in dissolved oxygen,water temperature,and carbon source utilization efficiency in deep-bed denitrification filters,it was found that dissolved oxygen in deep-bed denitrification filters was at a high value throughout the year,and the amount of dissolved oxygen and carbon source added in summer was lower than that in winter.Through the engineering transformation practice of capping and sealing the top of deep-bed denitrification filter to control reaeration,the winter operation results showed that the well sealed capping measures could effectively control the waterfall reoxygenation of the filter,and the dissolved oxygen in the upper influent of the filter was reduced from 8.90 mg/L to 4.80 mg/L,with a certain thermal insulation effect.During the winter operation of the WWTP,the carbon source dosage was reduced from 191 mg/L to 170 mg/L.On average,23.68 mg/L of carbon source was required for every 1 mg/L of total nitrogen removed,and the carbon source utilization efficiency was improved by about 10％.