重油气化装置含氰废水处理技术对比

某石化企业部分氧化制氢（POX）装置运行中产生大量含氰废水，影响下游污水处理厂正常运行。特别是在最上游常压蒸馏装置掺炼高氮原油时，污水处理厂氰化物问题凸显，废水排放超内控指标，严重制约该石化企业的原油采购。为使废水排放达到更富有前瞻性的环保排放要求及解除原油采购约束，该石化企业联合3家单位研发了催化氧化高温高压水解法、电催化氧化法和加药沉淀法3种除氰技术。对3种除氰技术进行了简单介绍，并对3种技术的优缺点进行了对比分析。

COMPARISON OF TREATMENT TECHNOLOGIES FOR CYANIDE CONTAINING WASTEWATER FROM HEAVY OIL GASIFICATION

A large amount of cyanide containing wastewater was produced during the operation of POX unit of a refinery and affected the normal operation of the downstream wastewater treatment plant. Especially when processing high-nitrogen crude oil in atmospheric distillation unit, the amount of cyanide in the wastewater increased significantly, and the discharge of waste water exceeds the internal control index, which seriously restricted the crude oil purchase of the petro-chemical enterprise. In order to meet environmental requirements and remove the constraints for crude oil purchase, this paper introduced the advantages and disadvantages of three kinds of cyanide removal technologies: (i) catalytic oxidation and hydrolysis at high temperature and high pressure, (ii) elec-tro-catalytic oxidation, and (iii) chemical addition precipitation.