Cansolv中和废水对废水处理装置的影响分析及处理措施

Effect analysis and technical solution of Cansolv neutralized wastewater on the wastewater treatment unit

关键词:  Cansolv  废水处理  中和废水  影响分析  处理措施

Key words:  Cansolv  wastewater treatment  neutralized wastewater  effect analysis  treatment measure

摘要:

Cansolv装置产生的酸性和碱性废水中和后,存在中和废水温度高、排水量大、COD值和还原性硫含量高等问题,造成废水处理装置废水调节池长期满液位、反渗透膜寿命衰减、处理效率下降、蒸发结晶装置设备管线堵塞严重,影响冷凝回水和产盐品质。通过采取以下工艺优化措施,减少中和废水产生量:①调整酸性废水排水位置；②降低中和废水温度；③调整文丘里管组合塔出口尾气温度；④加强尾气焚烧炉配风操作；⑤提高湿式电除雾器除酸雾的能力；⑥更换离子交换树脂和优化胺液净化装置运行程序；⑦提高除盐能力,增加臭氧催化装置和氧化装置氧化降解,降低废水COD值和还原性硫含量,确保废水处理装置运行正常。

Abstract:

The neutralized water produced from acidic and alkaline wastewater from the Cansolv device were associated with high-temperature, large generation, and high COD and reductive sulfur contents. The acceptance of this neutralized wastewater would lead to a series of problems in the wastewater treatment unit. It would cause long-term full liquid level of equalization tank in waste water treatment unit, life attenuation of reverse osmosis membrane, treatment efficiency decreasing, serious pipeline blockage of evaporation crystallization device, and affect the quality of condensate return water and salt production. In this study, process optimization were conducted to reduce the amount of the neutralized wastewater, including adjusting the drainage position of acidic wastewater to reduce the temperature of the neutralized wastewater, adjusting the vent temperature of the Venturi pipe combination tower outlet, strengthening the exhaust incinerator wind distribution operation, enhancing the acid removal capacity of the wet electric defoiler, replacing the ion exchange resin and optimizing the operation procedures of the amine purification device to improve the salt removal capacity. Besides, the ozone catalytic oxidation device was added to reduce the COD and reductive sulfur content in the wastewater. The above-mentioned measures may contribute the steady operation of the wastewater treatment units in the natural gas purification plant.