MAP法处理高氨氮废水的影响因素研究

Influencing Factors of High Ammonia Nitrogen Wastewater Treatment by MAP Method

采用磷酸铵镁沉淀法处理高氨氮废水,考察了pH、反应温度、反应时间以及镁盐和磷盐沉淀剂与氨氮的配比等因素对去除氨氮的影响。结果表明,在pH值为10、Mg∶N∶P(物质的量之比)=1.1∶1.0∶1.3、温度为18～30℃的条件下,自动搅拌、反应并沉淀20 min,氨氮浓度可由1 000 mg/L降到76 mg/L,去除率高达92.4%,为后续生化处理奠定了基础。

The magnesium ammonium phosphate （MAP） precipitation process was used to treat high ammonia nitrogen wastewater, and the effects of pH, temperature, time and ratio of magnesium and phosphorus precipitators to ammonia nitrogen on the ammonia nitrogen removal were investigated. The resuits show that under the conditions of pH 10, Mg ： N ： P molar ratio 1.1 ： 1.0 ： 1.3, temperature 18 to 30 ℃, automatic stirring, reaction and precipitation 20 min, the ammonia nitrogen r concentration is decreased from 1 000 mg/L to 76 mg/L, and the removal rate reaches 92.4%, laying a foundation for the following biochemical treatment.