硝化-反硝化曝气生物滤池改进工艺处理水产养殖废水

Improvement technology of nitrification and denitrification biological aerated filter treatment of aquaculture wastewater

采用出水回流的上流式曝气生物滤池处理模拟水产养殖废水,逐一优化厌氧/好氧(A/O)一体化曝气生物滤池中水力负荷、气水体积比以及硝化液回流比等3个因素,通过分析出水水质确定最佳运行参数.结果表明:1)设定厌氧/好氧区域体积比为1∶1,当工艺中水力负荷为39.86m3·(m^2·d)^(-1),硝化液回流比为200%,气水体积比为2∶1,水力停留时间为1.81h时,污染物去除效果最佳,化学需氧量(chemical oxygen demand,COD)、氨氮、总氮和总磷的平均去除率分别达71.09%,96.29%,78.26%,17.22%;2)各优化条件下,当A/O体积比为1∶1时,该改进工艺下总氮去除效果可达GB 3838—2002《地表水环境质量标准》中的Ⅲ类标准.

The up-flow biological aerated filter of water reflux is adopted to treat aquaculture wastewater.The experiment takes the hydraulic loading,gas-water ratio and nitrification liquid reflux ratio as research object to analysis water quality and determine the best parameters.The results show that:1)Pre-set the A/O volume ratio to 1∶1,when the BAF(biological aerated filter)is operated stably under the condition of hydraulic loading 39.86m^3·(m^2·d)^(-1),nitrification liquid reflux ratio of 200%,gas-water ratio of 2∶1,HRT=1.81 h,the removal efficiency is the best,average removal of COD,ammonia nitrogen and total nitrogen and total phosphorus are71.09%,96.29%,78.26%,17.22%;2)Only when the A/O volume ratio of 1∶1,could the removal efficiency of TN reach the requirement of class Ⅲ of Surface Water Quality Standard(GB 3838—2002).It is feasible to apply in aquaculture wastewater treatment.