海水利用废水反应条件对MAP除磷效能的影响

EFFECT OF REACTION CONDITION ON THE MAGNESIUM AMMONIUM PHOSPHATE CRYSTALLIZATION AND PHOSPHORUS REMOVAL PERFORMANCE

为了探讨磷酸铵镁结晶法处理海水利用废水的可行性,通过试验讨论了反应条件,即pH、温度、Cl-质量浓度和Mg2+质量浓度对磷酸铵镁结晶除磷效能的影响作用规律。结果表明,当模拟废水的含磷质量浓度为100 mg/L,反应体系的pH为9.5～10时,磷酸铵镁结晶除磷效率最高,可达99%以上;模拟废水温度在10～30℃范围内变化时,磷酸铵镁结晶除磷效率不受影响;Cl-质量浓度为2.5～15 g/L时,磷酸铵镁结晶法可去除99%的磷,Cl-质量浓度变化对除磷率没有影响;随着Mg2+质量浓度从50 mg/L逐渐提高至1 200 mg/L,溶液中剩余磷质量浓度逐渐下降;XRD分析表明,反应产物为磷酸铵镁晶体。海水利用废水的主要离子条件对磷酸铵镁结晶除磷没有影响,还可以提供镁源。因此,利用磷酸铵镁结晶法去除并回收海水利用废水中的磷是可行的。

In order to investigate the feasibility of the magnesium ammonium phosphate crystallization to treat seawater using wastewater, effect of reaction condition, such as reaction pH, temperature and the levels of chlorine magnesium ions on the magnesium ammonium phosphate crystallization and phosphorus removal performance were reported through a large number of beaker tests. The test result showed that the highest efficiency of the magnesium ammonium phosphate crystallization and phosphorus removal can be achieved. And more than 99% when phosphorus concentration was 100 mg/L and the pH of the reaction system was 9.5 - 10.0; Simulated wastewater temperature ranged from 10 ℃ to 30 ℃, but the phosphorus removal efficiency was not affected; Cl-concentration ranged from 2.5 to 15 g/L, the rate of phosphorus removal can also achieve more than 99%, so the changes of Cl- concentration had no effect on phosphorus removal rate; Mg2＋ concentration gradually increased from 50 to 1 200 mg/L, the remaining phosphorus concentration in the solution decreased gradually; XRD analysis indicated that the reaction products were magnesium ammonium phosphate crystal. Major ions of seawater wastewater conditions had no effect on the magnesium ammonium phosphate crystallization of phosphorus removal and also can provide magnesium source. Therefore, the way of using magnesium ammonium phosphate crystals to remove and recycle the phosphorus in seawater using wastewater were feasible.