DNT废水铁炭微电解+生化处理工程实例

Case study of DNT wastewater treatment by ferric-carbon micro-electrolysis+biochemical process

甘肃某公司二硝基甲苯（DNT）生产废水处理站设计处理规模1 600 m3/d,采用铁炭微电解＋UASB＋接触氧化＋BAF＋生物炭工艺进行处理,进水COD、硝基苯类化合物分别为2 089、164.9 mg/L,pH 1～2;出水COD、硝基苯类化合物分别为39.5、0.3 mg/L,去除率分别为98.1%、99.8%,排水指标优于国家《污水综合排放标准》（GB 8978—1996）一级标准,吨水直接处理成本为7.62元。

The designed treatment scale of the DNT industrial wastewater plant in a company in Gansu Province is1 600 m3/d.The wastewater has been treated by ferric-carbon micro-electrolysis＋UASB＋contact oxidation＋BAF＋biological activated carbon process.Its influent COD is 2 089 mg/L,nitro-compounds 164.9 mg/L,and pH 1-2.Its effluent COD is 39.5 mg/L and nitro-compounds 0.3 mg/L.The removing rate of COD and nitro-compounds are 98.1%and 99.8%,respectively.The indexes of discharged water is superior to Class A of Integrated Wastewater Discharge Standard（GB 8978—1996）.The cost of wastewater treatment per ton is CN$7.62.