摘要：

针对某钢铁公司焦化厂剩余氨水，利用化工副产合成磷酸铵镁而进行化学气浮法预处理。首先，考察了不同操作条件如药剂配比、pH、反应温度等因素对氨氮去除率的影响；然后，在5m³/h气浮装置上进行了中试。结果表明，对于总氨氮达2600mg/L左右的高浓度氨氮废水，当pH=9.0、常温和n（Mg）n：（P）：n（N）=3.5：1.01：.0时，废水中总氨氮去除率可达95%以上，余磷<1mg/L；气浮法污泥量约只有相应沉降法的1/10³/7。经气浮预处理后的废水能满足后续生化处理要求，且可回收含P、N及Mg等多种元素的磷酸铵镁（MAP）产品作高效复合肥。

关键词: 氨氮废水, 剩余氨水, 化学气浮, 磷酸铵镁

Abstract:

Aiming at the residual ammonia water from the coking factory of a steel-iron company, magnesium ammonium phosphate (MAP)has been synthesized by the chemical by-product and the chemical floatation is used for pretreatment. Different operational conditions influencing the removal efficiency of ammonia-nitrogen have firstly been studied, such as the ratio of reagent, pH value, reaction temperature, and so on; and then, pilotplant test is carried on 5 m³/h floatation equipment. It is indicated that for the highly concentrated ammonianitrogen wastewater whose total ammonia-nitrogen is 2 600mg/L or so, the removal efficiency of total ammonianitrogen in the wastewater could exceed 95% and the remained phosphorus concentration is less than 1mg/L when its pH=9.0, room temperature and n(Mg):n(P):n(N)=3.5:1.0:1.0; the sludge amount by floatation method is only about 1/10-3/7 of one by corresponding sedimentation method. The wastewater after floatation pretreatment can meet the demands of later bio-chemical treatment, and MAP product can be recycled as a high efficiency complex fertilizer which contains several elements such as P, N, Mg and so on.

Key words: ammonia-nitrogen wastewater, residual ammonia water, chemical floatation, magnesium ammonium phosphate

中图分类号: 

• X703.1