摘要：

石油化工行业产生的大量高盐废水直接排放到环境中，会对生态环境造成严重破坏。随着对排放高盐废水中含盐量的限制日益严格，某石化企业针对其产生的高盐废水进行了零排放处理研究。经过工艺选型和实验室验证，确定了预处理-纳滤（分盐）-反渗透（再浓缩）-蒸发及冷冻结晶的分盐处理工艺。应用结果表明，处理设施出水水质达到循环冷却水用再生水水质标准（HG/T 3923-2007），分离出的NaCl和Na₂SO₄也分别达到工业盐标准（GB/T5462-2015）和（GB/T 6009-2014），实现了高盐废水的零排放和资源化回用。

关键词: 高盐废水, 零排放, 蒸发结晶, 石化废水

Abstract:

When a large amount of petrochemical high-salt wastewater is discharged into the environment, it is easy to cause serious damage to the ecological environment. As the limitation of the salt content of the discharged wastewater is increasingly strict, a petrochemical enterprise studied the zero-discharge treatment of its high salt wastewater. After the process selection and laboratory verification, the separation process of pretreatment, nanofiltration(salt separation), reverse osmosis(reconcentration), evaporation and freeze crystallization was determined. The field results show that the effluent of the treatment facility meets the quality standard of recycled water for circulating cooling water(HG/T 3923-2007), and the separated sodium chloride and sodium sulfate also meet the industrial salt standards (GB/T 5462-2015) and (GB/T 6009-2014) respectively, realizing zero discharge and resource recycling of highsalt wastewater.

Key words: high salt wastewater, zero discharge, evaporation crystallization, petrochemical wastewater

中图分类号: 

• X703