摘要：

生物质煤气废水是一种新出现的高浓度氨氮有机废水。作者采用化学沉淀法去除该废水中的氨氮,研究了不同沉淀剂、pH、温度和搅拌时间对氨氮去除效果的影响。结果表明,MgCl₂+Na₃PO₄·12H₂O明显优于其他沉淀剂组合。当n(Mg²⁺)∶n(NH₄⁺)∶n(PO₄^3-)=1∶1∶1、pH10.0、温度30℃、搅拌时间30min时,废水中的氨氮质量浓度从处理前的222mg/L降到17mg/L,去除率为92.3%。

关键词: 化学沉淀, 生物质气化, 洗焦废水, 氨氮去除

Abstract:

The biomass gasification wastewater is a newtype of organic wastewater with high concentration ammonia-nitrogen.In order to remove ammonia-nitrogen from this wastewater, chemical precipitation process has been carried out. The effects of the different types and dosage of precipitants, pH, temperature and stirring time on the removal of ammonia-nitrogen are investigated. The results show that MgCl₂+Na₃PO₄·12H₂O is significantly better than other combination. When n(Mg²⁺)∶n(NH₄⁺)∶n(PO₄^3-)-1∶1∶1, pH is 10.0, temperature is 30 ℃ and stirring time is 30 min, after the wastewater,whose ammonia-nitrogen contents was 222 mg/L, was treated, the ammonia-nitrogen content goes down to 17 mg/L, and the removal rate of ammonia-nitrogen is 92.3%.

Key words: chemical precipitation, biomass gasification, coke-washing wastewater, removal of ammonia-nitrogen

中图分类号: 

• X703. 5