【摘要】 采用化学沉淀剂MgCl2 ·6H2 O和Na2 HPO4·12H2 O(或MgHPO4·3H2 O)与焦化废水中的NH+ 4 反应 ,生成磷酸铵镁沉淀。探讨了不同操作条件对氨氮去除率的影响。在pH为 8 5～ 9 5的条件下 ,投加的药剂Mg2 + ∶NH+ 4 ∶PO3 -4(摩尔比 )为 1 4∶1∶0 8时 ,废水氨氮的去除率达 99%以上 ,出水氨氮的质量浓度由 2 0 0 0mg/L降至 15mg/L。更多还原

【Abstract】 Magnesium ammonium phosphate precipitate was formed in the treatment of coking-plant wastewater via the reaction of MgCl₂·6H₂O with Na₂HPO₄·12H₂O or MgHPO₄·3H₂O.The effects of different operating conditions on the removal of ammonium-nitrogen were examined.The results show that when the wastewater pH is 8.5～9.5 and the mol ratio of Mg²⁺/NH⁺₄/PO₄^3- is 1.4/1/0.8,the removal rate of ammonium-nitrogen is over 99%,and the mass concentration of ammonium-nitrogen in effluent is reduced from 2000 mg/L to 15 mg/L.更多还原