PVA填料对低温生活污水生物脱氮的影响

Effect of PVA filler on biological denitrification of low temperature domestic sewage

为解决北方冬季寒冷天气条件下,生活污水脱氮难的问题,通过模拟CASS工艺中投加聚乙烯醇(PVA)凝胶球填料的方法对低温生活污水进行处理.实验确定的最佳运行条件为:曝气时间2h,回流比300%,连续进水量5L,搅拌速度2r/s.在上述最佳处理条件下,未投加PVA凝胶球时氨氮去除率约为15%,投加PVA凝胶球后氨氮去除率约为65%.实验结果证明PVA凝胶球填料可以有效提高生活污水氨氮的去除率,解决低温生活污水生物脱氮难的问题.

The method of simulated CASS process with polyvinyl alcohol(PVA)gel ball packing is used to solve the difficult problem of nitrogen removal from domestic sewage in cold winter in the north.The optimal operating conditions are as follows:the aeration time is 2 h,the reflux ratio 300%,the continuous influent 5 L,and the stirring speed 2 r/s.Under the above treatment conditions,the removal rate of ammonia nitrogen is about 15%without the PVA gel ball the removal rate of ammonia nitrogen is about 65%with PVA gel ball.The experimental results show that PVA gel ball filler can effectively improve the removal rate of ammonia nitrogen in domestic sewage and solve the problem of biological nitrogen removal in low temperature domestic sewage.