Abstract:

Negative pressure and evaporation methods have been used for the concentration and recovery of sulfuric acid, and the combined process of NaClO oxidation-poly-aluminum chloride flocculation-sedimentation for the treatment of nitrochlorobenzene industrial wastewater. The engineering design of the wastewater treatment system has been accomplished. The effluent quality meets the requirements for the third class of Discharge Standard of Integrated Wastewater (GB 8978—1996), and nitrobenzene compounds is≤5 mg/L. The process has obvious economic benefit, and the system can recover 90% of H2SO4, 80 000 t/a. RMB 4 000 000 of the production cost can be saved, according to RMB 50 per ton.

Key words: nitrochlorobenzene, wastewater treatment, negative pressure and evaporation, sodium hypochlorite (NaClO)

摘要：

采用负压蒸发法浓缩回收硫酸、NaClO氧化、聚合氯化铝混凝沉淀组合工艺处理二硝基氯苯生产废水,并进行了废水处理系统工程设计。出水达到《污水综合排放标准》(GB 8978—1996)三级排放标准,硝基苯类化合物≤5 mg/L。该工艺经济效益显著,系统年回收90%的硫酸8万t,按50元/t计算,可节约资金约400万元/a。

关键词: 二硝基氯苯, 废水处理, 负压蒸发浓缩, 次氯酸钠

CLC Number: 

• X703.1