电絮凝技术对尿液废水中氮磷的回收效果研究

Experimental study on the recovery effect of nitrogen and phosphorus from urine wastewater by electric flocculation technology

为充分利用尿液废水中可作为肥料的氮、磷营养元素,采用电絮凝技术处理模拟尿液废水,选用单因素试验与正交试验结合的模式,探究电解时间、极板间距、电流密度及初始pH对电絮凝装置总磷及氨氮回收效果的影响。结果表明,在连续流条件下,电絮凝工艺的最佳运行条件为极板间距20 mm、水体初始pH=7、电流密度60 A/m2,总磷回收率达到95.85%,氨氮去除率为15.40%。采用电絮凝工艺处理高磷废水时,出水可满足标准要求,但对氨氮的脱除效果并不理想。

In order to make full use of the nitrogen and phosphorus nutrients that could be used as fertilizer in urine wastewater,electroflocculation technology was used to treat simulated urine wastewater.A combination of single-factor test and orthogonal test was used to investigate the effects of electrolysis time,pole plate spacing,current density and initial pH,on the recovery of total phosphorus and ammonia nitrogen in the electroflocculation device.The results showed that under continuous flow conditions,the optimum process conditions were plate spacing 20 mm,initial pH 7 and current density 60 A/m2,and the recovery rate of total phosphorus and ammonia nitrogen were 95.85%and 15.40%respectively.The effluent could meet the standard when the high phosphorus wastewater was treated by the electroflocculation process,but the removal of ammonia nitrogen was not satisfactory.