污水零排放技术在天然气净化厂的首次运用

First application of zero-discharge sewage treatment technology in a natural gas purification plant

天然气净化厂运用生化+电渗析+蒸发结晶污水处理技术,采用污水分类收集、分质处理、分级回收等方法,首次实现了污水零排放的目标。由于相关污水处理技术属于首次运用,在运行过程中存在电渗析设备结垢严重、蒸发结晶出盐效果差、回水水质及水量影响循环水系统运行等问题。通过采取优化电渗析和蒸发结晶装置操作运行参数,采用预膜、加硫酸降低pH等措施减缓循环水系统腐蚀,改进工艺技术提升水质品质应用等手段解决以上问题,保证了天然气净化厂污水零排放技术的成功应用,同时为类似天然气净化厂污水处理提供借鉴。

The sewage treatment of the natural gas purification plant uses biochemical and electrodialysis with evaporative crystallization sewage treatment process for the first time,and achieves the goal of zero sewage discharge for the first time by relying on the methods including sewage classification during collection,separate treatment for different quality sewage group and recovery of segregated grades of water.As the above process is used for the first time,there are operating issues such as serious scaling of electrodialysis equipment,poor evaporative crystallization effect,return water quality and water volume affecting the operation of circulating water system in the process.By means of optimizing the operating parameters of electrodialysis and evaporative crystallization units,adopting measures such as pre-filming and adding sulfuric acid to reduce pH to slow down the corrosion of circulating water system,and technical transformation to upgrade the water quality;the successful application of zero-discharge sewage treatment technology in natural gas purification plant is guaranteed.The above experience provides reference for the successful application of zero-discharge sewage treatment technology in similar natural gas purification plant.