摘要：

管件生产废水属于高酸性废水，废水含有高浓度的氨氮以及Fe²⁺、Zn²⁺等金属离子，缺少有机物，水质呈现 “低碳高氮”特征。通过水质分析，选用“物化+生化”的组合处理工艺处理该废水。利用二级中和、混凝沉淀作为物化预处理工艺，并采用“A/O/A/O”型SBR反应器进行生物脱氮。针对组合处理工艺的试验研究表明：该工艺对TFe、Zn²⁺的去除率可达99%以上，出水TN<10 mg/L。处理水水质优于《污水综合排放标准》（GB 8978—1996）的一级标准，可全部作为厂区回用水。

关键词: 酸性废水, 除铁, 除锌, 生物脱氮

Abstract:

The wastewater from the production of pipe fittings is highly acidic. The wastewater contains highly concentrated ammonia/nitrogen, as well as metallic ions, such as Fe²⁺, Zn²⁺, etc. and is lack of organic matter. Its water quality is characterized by "low carbon & high nitrogen". By analyzing the wastewater quality, the combined physico-chemical and bio-chemical process has been selected. The two-stage neutralization-coagulation precipitation process is used for the physico-chemical pretreatment, and A/O/A/O-type SBR is used for biological denitrification. The results indicate that by this process the removing rates of TFe and Zn²⁺ could be above 99%, 10 mg/L. The treated water quality is superior to the first class Integrated Wastewater Discharge Standard(GB 8978—1996), and the effluent can fully be reused in the factory.

Key words: acidic wastewater, removal of iron, removal of zinc, biological denitrification

中图分类号: 

• X703.1