摘要： 介绍了火电厂脱硫废水的水质特点，分析其氨超标现状，阐述了化学沉淀工艺去除脱硫废水中氨氮的优势，并论证其可行性。结果表明，当pH为8.5、n（Mg）：n（N）为5.0：1、n（P）：n（N）为2.0：1、反应温度为25~30℃、搅拌速度为150 r/min、搅拌时间为20 min时，该工艺对某火电厂脱硫废水中氨氮的去除率能达到90%以上，最终投加少量NaClO可使废水中氨氮达标排放。XRD及SEM结果显示，反应中产生的沉淀物为磷酸铵镁盐。

关键词: 火电厂, 脱硫废水, 氨氮, 化学沉淀

Abstract: The characteristics of desulfurization wastewater in a thermal power plant is introduced,the ammonia ni-trogen over-proof situation of desulfurization wastewater analyzed,the advantages of chemical precipitation process for removing ammonia nitrogen from desulfurization wastewater expounded,and its feasibility demonstrated. The re-sults show that the ammonia nitrogen removing rate from the desulfurization wastewater of a thermal power plant by this process can be above 90%,when pH=8.5,n(Mg):n(N)=5.0:1,n(P):n(N)=2.0:1,reaction temperature 25-30℃,stirring speed 150 r/min,and stirring time 20 min. At the end,the dosing of a small amount of NaClO can make am-monia nitrogen in the wastewater reach the discharge standard. The XRD and SEM results show that the precipitate produced in the reaction is magnesium ammonium phosphate.

Key words: thermal power plant, desulfurization wastewater, ammonia nitrogen, chemical precipitation

中图分类号: 

• X773