【摘要】 采用化学药剂Na2HPO4·12H2O和MgCl2·6H2O与焦化废水中的高浓度氨氮反应生成磷酸铵镁(MAP),着重探讨了pH值对氨氮去除效果的影响。实验结果表明,在Mg2+,HN4+,PO43-物质的量比为1.3∶1∶0.9,得到最佳pH为8.5～10,原废水中的NH3-N可由2380mg/L降到100mg/L以下,生成的MAP晶体纯度较高,对废水中的有毒、有害物质无吸附,并具有良好的沉降性能。更多还原

【Abstract】 Na 2 HPO 4 ·12H 2 O and MgCl 2 ·6H 2 O react with highly concentrated ammonia - nitrogen from coke plant wastewater,forming magnesium ammonium phosphate(MAP).The effect of pH value on the ammonia - nitrogen removal result isexpolored emphatically.The experimental resultsshow that when the ratio of n(Mg 2+ ) ∶ n(NH 4+ ) ∶ n(PO 43- )iscontrolled at1.3 ∶ 1 ∶ 0.9,the optimal pH isabout8.5to10.The NH 3 - N in the original wastewater can be decreased from2380mg /L to lower than100mg /L .The formed MAP crystal hashigh purity.It doesnot adsorb the poisonousand harmful substancesin the wastewater.Furthermore,itssedimentation capability isgood.更多还原