利用化学沉淀法降低焦化废水氨氮浓度的预处理工艺研究

为了有效净化高浓度氨氮工业废水,采用向废水中投加MgCl2·6H2O和Na3PO4·12H2O生成磷酸氨镁沉淀的方法,以去除其中的高浓度氨氮。结果表明,在pH值为9.0,Mg^2＋、NH4^＋、PO4^3-的摩尔比为1.2：1：0.9,反应温度为25℃,反应时间为20 min,沉淀时间为50 min的条件下,氨氮质量浓度可由3 100 mg/l降低到56mg/l,去除率达到98%以上,为后续生化处理创造了条件。

Study on the Degradation of Ammonia- Nitrogen in Coking Waste Water by Chemical Sedimentation

Alab - scale study was conducted to precipitate the high strength of ammonia - nitrogen in industry waste water to form magnesium ammonium phosphate by applying such chemicals as MgCl2 · 6H2O and Na3PO4 O 12H2O. It showed that the mass concentrations of NH^4＋ - N could be reduced from 3 100 mg/l to 56 mg/l with a removal percentage of 98% when the moore ratio of Mg^2 ＋ , NH4^＋ , PO4^3- was controlled at 1.2：1：0. 9, the pH of waste water was adjusted to 9.0, the temperature was at 25 ℃, the reaction time was 20 rain and the precipitation time was 50 min. That the biochemistry being follow - up is handled has created condition.