MAP法去除联碱生产清洗水中氨氮的研究  

Study on Ammonia Removal From Rinse- wastewater in Combined-soda Process by MAP Method

作　　者：段钧元 

机构地区：[1]广西净宇环境工程有限责任公司桂林分公司,广西桂林541004

出　　处：《山东化工》2015年第9期172-176,共5页Shandong Chemical Industry

摘　　要：以联碱生产清洗废水为研究对象,探索了p H值、化学药剂投放配比、反应时间、不同镁源材料对MAP法去除氨氮的影响。结果表明,在反应温度为室温(25±1)℃,p H值为10.5,物质的量比n(Mg2+)∶n(PO43-)∶n(NH4+)为1.2∶1∶1时,氨氮去除效果最佳,去除率达到98.4%;可溶性镁源优于Mg O,其中Mg Cl2·6H2O的效果更好;碱业生产废水的氨氮去除率和残留浓度随氨氮初始浓度而变化,中等浓度时,氨氮去除率较高、氨氮残留浓度和磷残留浓度较低,氨氮初始浓度为1000~3000 mg/L,氨氮残留浓度皆在50 mg/L以下,MAP法可有效降低后续深度处理负荷,同时获得缓释肥。Taking the rinse- wastewater of combined -soda process as the research object, explored the effects of pH value, dosing ratio of chemical agent, l^eaction time, different sources of magnesium materials on the ammonia nitrogen removal by MAP method. The results showed that, the reaction temperature of （25 ± 1 ）℃, when the pH value was 10.5 and the molar ratio of n （ Mg^2＋ ） ： n （ PO4^3- ） ： n （ NH4^＋ ） was 1.2：1 ： 1, ammonia nitrogen removal effect was best, the removal rate reached 98.4% ; soluble magnesium source was better than MgO, in which MgCl2· 6H2O was better. Ammonia removal and residual concentration of alkali industry wastewater varies with the initial concentration of ammonia. When in moderate concentrations, the ammonia removal was high and the residual concentration of ammonia nitrogen and phosphorus were low. When the initial concentration of ammonia was 1000 - 3000 mg/L, residual ammonia concentrations was in 50.0mg / L or less, MAP method can effectively reduce the processing load on the advanced treatment, while obtain slow - release fertilizer.

关 键 词：氨氮 镁源 磷酸铵镁 

分 类 号：X703[环境科学与工程—环境工程]