摘要
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.
出处
《吉林农业大学学报》
CAS
CSCD
北大核心
2014年第6期685-689,共5页
Journal of Jilin Agricultural University
基金
吉林省教育厅"十二五"科学技术研究项目[吉教科合字(2014)第650号]
关键词
剩余污泥
氮磷回收
磷酸铵镁沉淀法
磷释放
臭氧氧化
sewage sludge nitrogen and phosphorus recovery magnesium ammonium phosphate method ( MAP ) phosphorus release ozone oxidation