化肥厂含氮废水的生物硝化处理试验

Treatment of Nitrogen-Containing Wastewater from aChemical Fertilizer Plant by Biological Nitrification Process

用维纶软性纤维作填料，进行了生物膜法三级硝化处理化肥厂含氮废水的试验，ＴＫＮ的去除负荷最高可达０．３７７ｋｇ／ｍ￣３·ｄ，总硝化率可达９３％。三级硝化后，出水中Ｕｒｅａ－Ｎ＜３ｍｇ／Ｌ、ＮＨ＿３－Ｎ＜１７ｍｇ／Ｌ。若投加痕量Ｍｇ￣（２＋）（５０μｇ／Ｌ）可以促进尿素的水解。

Experiments have been carried out for treatment of nitrogen-containingwastewater from a chemical fertilizer plant by three-step biofilm nitrification process withsoft polyvinyl alcohol fibre as packing materials.Maximum TKN removal loading can comeup to 0. 377kg/m￣3·d with 93.4%of nitrification efficiency.After treatment,Urea-Nin theeffluent is less than 3mg/Land NH_5-N less than 17mg/L. Adding trace quantity of Mg￣(2+)(50μg/L)into the wastewater can accelerate the hydrolysis of urea.