臭氧处理剩余污泥上清液中氮磷元素的释放与回收

Nitrogen and Phosphorus Release and Recovery from Sewage Sludgeby Ozone Treatment

采用SBR反应器处理污水，对剩余污泥的氮磷元素释放与回收进行了分析。稳定运行中COD去除率均为88.7％，出水达到城镇污水二级排放标准；出水氨氮、正磷酸盐浓度分别为9.8，2.7 mg／L；臭氧对剩余污泥氮、磷元素的吹脱作用均小于其氧化作用，吹脱作用对氨氮、磷元素释放率的贡献值分别＜6.50％和3.40％。经臭氧氧化后，氨氮浓度由9.56 mg／L 迅速增加至23.58 mg／L，释放率为146.75％；磷的浓度在2.93～3.30 mg／L变化，释放率为12.79％，臭氧氧化过程氨氮的释放作用明显高于磷，磷的总体浓度变化平稳，释放率呈现波动趋势；用磷酸铵镁法对臭氧处理上清液中氮磷进行回收，氨氮回收率达6.18％，磷回收率为97.8％，达到了对磷高效回收的目的。

By sequencing batch reactor （SBR）, nitrogen and phosphorus release and recovery from sewage sludge are analyzed. At stable operation, the average COD removal rate is 88.7%, meeting the requirements of secondary emission standards of urban wastewater; The effluent concentration of ammonia nitrogen and orthophosphate is 9.8 mg/L and 2. 7 mg/L, respectively; The effect of strip- ping action of ozone is lower than oxidation, the release rates of ammonia nitrogen and phosphorus under stripping action are less than 6. 50% and 3.40%, respectively ; After ozone oxidation, ammo- nia nitrogen concentration increases from 9.56 mg/L to 23.58 mg/L rapidly, with the release rate of 146.75% ; Phosphorus concentration increases from 2.93 mg/L to 3.30 mg/L, with the release rate of 12.79%. The releasing effect of ammonia nitrogen is obviously higher than that of phosphorus in ozone oxidation process, and the concentration changes of phosphorus are smooth, showing a fluctua- ting trend ; Magnesium ammonium phosphate method （ MAP ） is used to recover nitrogen and phos- phorus of ozone treatment, ammonia nitrogen recovery rate is 6. 18%, and the phosphorus recovery rate is 97.8%, reaching the purpose of recycling phosphorus efficiently.