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发明公开
CN107098431A 一种废水中回收磷的方法 无效 - 驳回

一种废水中回收磷的方法
摘要：
本发明涉及一种废水中回收磷的方法，包括步骤有：(1)确定反应废水体积A；(2)在待处理废水中加入0.16％‑0.24％的聚丙烯酰胺和0.08％‑0.12％的对氯苯甲酸；(3)用NaOH片状固体和(1+1)HCl溶液调节反应体系PH值至8.7；(4)投加MgCl2至n(Mg2+)：n(P)＝1:1；(5)控制反应温度，紫外辐照强度，搅拌速度及反应时间；(6)反应沉淀过滤，得到MAP沉淀；(7)将MAP沉淀粉碎、烘干后，得到鸟粪石(MgNH4PO4·6H2O)，完成废水中磷的回收。采用本方法废水中磷的回收率可高达87％，生成的鸟粪石沉淀为斜方晶体，纯度可达90％，属于优质的化学缓释肥。
摘要（英）：

The invention relates to a method for recovering phosphorus from waste water. The method comprises the steps of (1) determining the volume A of reaction waste water; (2) adding 0.16 percent to 0.24 percent of polyacrylamide and 0.08 percent to 0.12 percent of parachlorobenzoic-acid into the waste water to be processed; (3) using NaOH flaked solids and a (1+1) HCl solution for adjusting a PH value of a reaction system to 8.7; (4) feeding MgCl2 until n (Mg<2+>):n (P) is equal to 1:1; (5) controlling reaction temperature, ultraviolet radiation intensity, stirring speed and reaction time; (6) filtering reactive precipitation to obtain an MAP precipitate; (7) after smashing and drying the MAP, obtaining struvite (MgNH4PO4.6H2O), and accomplishing the recovery of the phosphorus in the waste water. By adopting the method, the recovery rate of the phosphorus in the waste water can reach up to 87 percent, the generated struvite precipitate is an orthorhombic crystal, the purity can achieve 90 percent, and the struvite precipitate belongs to a high-quality chemical slow-release fertilizer.

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