焦化废水水质认知分析与探索

Cognitive analysis and exploration of coking wastewater quality

以河北协同水处理技术有限公司运维的40余个焦化废水处理项目为例,基于河北省科技厅《焦化废水近零排放技术集成研发与应用》项目积累汇总的水质分析检测数据,重点介绍了焦化废水部分特征污染物多环芳烃、苯并[a]芘、苯系物、吡啶在生化及后处理过程的变化趋势,同时对数据进行归纳和分析,给出了各污染物在不同工段水质中的范围区间。列举了部分由于焦化废水水质引起生化系统冲击的案例,对生化系统正常运行提供了重要参考依据。同时对后混苯并[a]芘多项目难达标情况进行了分析,发现苯并[a]芘主要在生化段去除率较高,通过对进水指标的把控,再经过后混加药的合理调整,最终均能实现稳定达标。最后分析了两个中水回用段膜法处理异常结垢案例,对中水回用段关键水质指标参数控制提供了指导方向和思路。

Taking more than 40 coking wastewater treatment projects operated and maintained by Hebei collaborative water treatment technology Co.,Ltd.as an example,based on the water quality analysis and testing data accumulated in the project"integrated research,development and application of coking wastewater near zero discharge technology"of Hebei provincial department of science and technology,this paper focuses on the changes in the biochemical and post-treatment processes of some characteristic pollutants of coking wastewater,such as polycyclic aromatic hydrocarbons,benzo[a]pyrene,benzene series,and pyridine.At the same time,the data is summarized and analyzed,and the range of each pollutant in different water quality stages is provided.Some cases of biochemical system impact caused by coking wastewater quality were listed,providing important reference basis for the normal operation of the biochemical system.At the same time,an analysis was conducted on the difficulty of achieving the standard for multiple projects of post mixed benzo[a]pyrene.It was found that the removal rate of benzo[a]pyrene was mainly high in the biochemical stage.By controlling the influent index and adjusting the post mixed dosage reasonably, stable compliance was ultimately achieved. Finally, two cases of abnormal scaling treatment using membrane method in the reclaimed water reuse section were analyzed, providing guidance and ideas for controlling key water quality indicators in the reclaimed water reuse section.