臭氧-生物活性炭工艺间歇性运行时保存方法的优化研究

Optimization Study of Preserve Method of O_3-BAC Filter in Intermittent Operation

针对目前生物活性炭炭滤池间歇性运行时在停运期间的保存方法缺乏系统性研究开展了运行研究,并在此基础上提出浸泡和小流量保存方法。依托中试活性炭柱装置,将小流量保存时进水流量依次定为20、40、60、80 L/h,运行8 d;中试共3根活性炭柱,分别采用浸泡保存、小流量保存和正常工况运行,运行30 d,监测浸泡与小流量保存时炭层内微生物变化与正常运行时COD_(Mn)和氨氮的去除效能;30 d后活性炭柱重新运行。结果表明,小流量保存进水流量为60 L/h出水水质不会恶化;保存30 d后,小流量保存的微生物变化较浸泡保存变化缓慢并且重新启动24 h后便可达到正常去除效能。可见小流量保存能够有效减缓停运时微生物的变化,显著缩短重新启动所需时间。

In the view of BAC filters of DWTPs lack systematic research when it stop running in intermittent operation condition, immersion and low flowing preservation method were proposed on this basis. The flow was set at 20, 40, 60, 80 L/h relied on the pilot-scale test activated carbon column device, and operated for 8 d. Three BAC columns were in the condition of immersion, low flowing preservation and normal respectively, microbiological changes of immersion, low flowing preservation, COD~ and NI-L＋-N removal efficiency of normal operation were detected during 30 d operation. BAC columns were rernnning after 30 d. The results showed that, the water quality would not deteriorate when the flow rate was 60 L/h, the microbiological change of low flowing preservation was slower than immersion after 30 d preservation, and it could reach normal removal efficiency after 24 h rerunning. It could clearly be seen that low flowing preservation could significantly retard the microbiological changes and be shortened the required time of O3-BAC recovered obviously.