优质水源条件下臭氧生物活性炭工艺运行模式探讨

Discussion on the operating mode of ozone biological activated carbon process under the high-quality water source

针对水厂引入优质水源后如何管理好臭氧生物活性炭工艺(O_(3)-BAC),降低生产能耗的问题,以确保水质安全、设备设施可靠的前提下,在J和N水厂分别开展停用和小流量运行O_(3)-BAC的生产性试验,重点分析了停用O_(3)-BAC对水处理效果、炭滤池和重点设备的影响,并对小流量运行O_(3)-BAC的运行模式进行了初探讨。结果表明,在原水为优质水源的条件下,若停用O_(3)-BAC,常规工艺处理高pH原水时,出厂铝会升高;炭池停用45 d内,滤料上微生物活性急剧下降,重启运行后65 d后仅恢复至停用前的64%;炭池停用再启动后,出水氨(以N计)含量呈现先增长后下降,且增长量随停用时间延长而增大,最高可升至0.7 mg/L,24小时后达到稳定;停用时间小于6个月,提升泵等重点设备性能无明显变化。若采用小流量运行O_(3)-BAC(超越水量约60%),N水厂电耗和氧耗分别下降8.80%和28.72%。

In response to the issue of how to manage the ozone biological activated carbon(O_(3)-BAC)process well and reduce energy consumption in water plant production after introducing highquality raw water in water plants,under the premise of ensuring treatment water quality safety and reliable equipment and facilities,production experiments were conducted on the O_(3)-BAC for decommissioning and low flow operation at J and N water plants,with a focus on analyzing the impact of stopping O_(3)-BAC on water treatment efficiency,carbon filters,and key equipment.Preliminary discussions were also conducted on the operation of O_(3)-BAC at low flow rates.The results indicate that under the condition that the raw water is a high-quality water source, if O_(3)-BAC isstopped, the aluminum content in the treatment water will increase when the conventional treatmentis used to treat high pH raw water. Within 45 days of deactivation of carbon filter, the microbialactivity on the filter material sharply decreased, and after 65 days of restart, it only recoveredto 64% of the level before deactivation. After the carbon filter is restarted, the ammonia content ineffluent (measured as N) shows a increase followed by a decrease, and the growth increases withthe extension of stop time, reaching a maximum of 0.7 mg/L, and stable after 24 hours. Thedowntime is less than 6 months, and there is no significant change in the performance of key equipmentsuch as intermediate lifting pumps. If O_(3)-BAC is operated at low flow rate (exceeding waterby about 60%), the electricity and oxygen consumption of N water plant have decreased by 8.80%and 28.72% respectively.