溶解氧对长距离输水管道水质影响

发布时间：2018-10-30 17:42

【摘要】：为保证长距离输水管道输送水水质,采用管道模拟反应器考察了溶解氧(DO)对输水管道水质影响以及曝气充氧后水质恢复情况。结果表明:DO降低影响氨氮(NH+4-N)的去除,DO浓度越低越不利于NH+4-N的去除,且曝气充氧后恢复越缓慢,DO=0.5 mg·L-1和DO=1.5 mg·L-1的反应器在运行95 h后,NH+4-N去除率分别由90%降到21%和85%,曝气充氧54 h和3 h后恢复;DO浓度降低导致亚硝酸氮(NO-2-N)积累明显增加,DO浓度越低,NO-2-N的积累越严重,且曝气充氧后恢复越缓慢,DO=0.5 mg·L-1的反应器在运行95 h后,出水NO-2-N由0.02 mg·L-1增加到0.354 mg·L-1,曝气充氧54 h后恢复,DO=1.5 mg·L-1的反应器在运行32 h后,出水NO-2-N达到最大值0.112 mg·L-1,曝气充氧4 h后恢复;DO浓度降低使水中UV254升高,DO=0.5 mg·L-1和DO=1.5mg·L-1的反应器在运行2 h后,出水UV254分别增加了70.8%和20.8%,均在运行32 h后恢复,且曝气充氧后保持稳定。因此,DO对长距离输水管道水质具有重要影响,可采用DO实现对水质的调控。
[Abstract]:In order to ensure the water quality of long distance water conveyance pipeline, the influence of dissolved oxygen (DO) on the water quality and the recovery of water quality after aeration were investigated by pipeline simulation reactor. The results showed that the decrease of DO affected the removal of NH _ 4-N, the lower the concentration of DO was, the less the removal of NH _ 4-N was, and the slower the recovery of NH _ 4-N was after aeration. The removal rate of NH 4-N in DO=0.5 mg L-1 and DO=1.5 mg L-1 reactors decreased from 90% to 21% and 85% respectively after 95 h operation, and recovered after aeration for 54 h and 3 h. The lower the concentration of DO, the higher the accumulation of nitrite nitrogen (NO-2-N). The lower the concentration of DO was, the more serious the accumulation of NO-2-N was, and the slower the recovery was after aeration. The reactor of DO=0.5 mg L-1 was operated for 95 h. The effluent NO-2-N was increased from 0.02 mg L-1 to 0.354 mg L -1, and then recovered after aeration for 54 h, and the DO=1.5 mg L-1 reactor was operated for 32 h. The NO-2-N of effluent reached the maximum value of 0.112 mg L ~ (-1) and recovered after aeration for 4 h. When the concentration of DO decreased, the UV254 in water increased. After 2 hours of operation, the effluent UV254 of DO=0.5 mg L-1 and DO=1.5mg L-1 increased by 70.8% and 20.8%, respectively, and recovered after 32 h operation. And aeration and oxygen to maintain stability. Therefore, DO has an important influence on the water quality of long distance water conveyance pipeline, and DO can be used to control the water quality.
【作者单位】：北京工业大学北京市水质科学与水环境恢复工程重点实验室;
【基金】：国家自然科学基金项目(51178003) 北京市自然科学基金项目(8122013)~~
【分类号】：TU991

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