焦化厂蒸氨预处理设施提标改造技术

Upgrading technology of ammonia pretreatmentfacility in a coking plant

青海某焦化厂厂区污水处理站原预处理工艺为陶瓷膜过滤+蒸氨,原水直接进陶瓷膜过滤器过滤后进入蒸氨系统,造成陶瓷膜运行负荷增加,蒸氨系统塔板结构堵塞,蒸氨效率偏低,运行期间对蒸氨负荷量调整和蒸氨废水指标的达标管控产生较大影响。蒸氨效率低下也致使蒸氨废水难以达到水处理生化单元进水指标要求,且因频繁检修,剩余氨水无法通过蒸氨系统有效处理,导致出现各事故池和事故槽液位偏高、消耗困难的现象。运行期间频繁更换陶瓷膜,劳动强度加大。因此需要对预处理设施进行改造,在废水进入陶瓷膜设施前去除水中悬浮物和大部分油类物质,减轻后续运行压力,确保厂区焦化废水稳定达标排放。结果表明,改造提升后,出水效果良好。

The original pretreatment process of the sewage treatment station of a coking factory in Qinghai Province was ceramic membrane filtration+ammonia evaporation.Raw water was filtered directly into the ceramic membrane filter and then entered the ammonia evaporation system,resulting in an increase in the operating load of the ceramic membrane,blockage of the tray structure of the ammonia evaporation system,and low ammonia evaporation efficiency.During operation,it had a great influence on the adjustment of ammonia evaporation load and the standard control of ammonia evaporation wastewater.The low efficiency of ammonia evaporation also makes it difficult for the ammonia evaporation wastewater to meet the intake index requirements of the water treatment biochemical unit.Moreover,due to frequent maintenance,the remaining ammonia water cannot be effectively processed by the ammonia evaporation system,which eventually leads to the occurrence of high liquid level and difficult consumption in the accident ponds and tanks.It also leads to frequent replacement of ceramic film during operation,increasing labor intensity.Therefore,it is necessary to transform the pretreatment facilities,remove the suspended matter and most oil substances in the water before the wastewater enters the ceramic membrane facilities,reduce the subsequent operating pressure,and ensure the stable discharge of coking wastewater in the plant.The results show that the effluent effect is good after upgrading.