Abstract:

According to the low C/N in gasoline refinery wastewater （GRW）， the effect of struvite precipitation（magnesium ammonium phosphate， MAP） on the sequent biological process has been investigated. MgSO₄ andKH₂PO₄ are used as precipitants and the removing efficiency of NH₄₊-N with different pH and sulfide concentrationhas been studied. The precipitation of struvite could increase the ratio of C/N to about 20， which will enhance thesequent biological process and ameliorate the quality of effluent. The concentrations of NH₄₊-N and COD are lessthan 5 mg/L and 50 mg/L respectively. The effluent could meet the requirements of recycle， which effectively savesthe fresh water and protects the environment.

Key words: magnesium ammonium phosphate, gasoline refinery, sulfide, struvite, biological treatment

摘要：

针对汽油精炼废水中C/N低的现状,研究了鸟粪石沉淀法对后续生化工艺的影响。实验选择硫酸镁和磷酸二氢钾作沉淀剂,研究了不同pH和硫化物浓度下氨氮的去除效率。鸟粪石沉淀法能够将C/N提高到20左右,强化了后续生化处理工艺的出水水质。最终出水的氨氮质量浓度<5 mg/L,COD<50 mg/L,完全满足回用要求,达到了节水和环境保护的目的。

关键词: 磷酸氨镁, 汽油精炼, 硫化物, 鸟粪石, 生化处理

CLC Number: 

• X703.1