后置臭氧-生物活性炭工艺在水厂改造中的若干设计点探讨

Discussion on Several Design Points of Post O_(3)-BAC Process in WTP Reconstruction

随着城市供水提质增效工作的逐步推进,越来越多的既有水厂采用了臭氧-生物活性炭(O_(3)-BAC)工艺提高出水水质。相较于前置O_(3)-BAC工艺,后置O_(3)-BAC在既有水厂提标改造中优势明显。它能承受较大的进水水量波动,改造过程管道接驳难度低,运行管理模式成熟,但是它也会提高现状构筑物运行负荷、加大回收回流量。结合深圳市某座水厂深度处理工程实例,一方面对改造中工艺构筑物的水量负荷、新增废水的回用设计等进行了计算和分析,另一方面创新地提出了用地面积受限条件下,可以采用组合式构筑物叠层清水池的设计方式。最后,本项目总结了构筑物设计水量需结合外循环用水来确定,且新增活性炭池废水水量较大,需充分考虑均匀回流。

With the promotion of urban water supply quality and efficiency improvement, more and more existing WTPs have adopted the ozone-biological activated carbon(O_(3)-BAC) process to improve the effluent quality. Compared with the post O_(3)-BAC process, the post O_(3)-BAC process has obvious advantages in upgrading the existing WTPs. It can withstand large fluctuation of water inflow, has low difficulty in pipeline connection during reconstruction, and has mature operation management mode. However, it can also increase the water load and the recycling flow. In combination with an advanced treatment project of a WTP in Shenzhen, on the one hand, the water load of process structures and the reuse design of new wastewater in the reconstruction are calculated and analyzed. On the other hand, the design method of combined structure laminated clean water tank can be innovatively proposed under the condition of limited land area. Finally, the project summarizes that the design water load should be determined in combination with the external circulation water, and the wastewater quantity of the BAC filter is large, so the uniform reflux should be fully considered.