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针对水厂滤池低负荷下滤后水浊度远低于标准要求、水头损失小、截污滤层浅、反冲洗时间较长、耗水耗电量大的问题,采用增加滤池负荷、延长过滤周期并调整反冲洗时间的优化方案。试验结果表明:在增大滤池负荷的基础上,将过滤周期由目前的55 h延长到71 h,水头损失随时间增加较快,截污滤层下移,滤层截污效能提高。不同反冲洗条件下的排水浊度峰值基本出现在气冲开始后1~2 min内,峰值大小与待滤水浊度及工况有关,但排水浊度降至10 NTU以下所需的总冲洗时间基本为10~11 min。在确保水质安全的前提下将过滤周期延长到71 h,反冲洗过程由气冲3 min、气水混合冲洗5 min和水洗5 min优化为气冲2 min、气水混合冲洗4 min和水洗4 min。通过优化,每个滤池每年可节约2.7万元,节能效果较为明显,具有较好的经济效益和社会效益。
Under the low load of waterworks filter, the turbidity of the filtered water is much lower than the standard, the head loss is small, the intercepting filter layer is shallow, the backwashing time is longer, and the consumption of water and electricity is large. By increasing the filter load, Optimize the filtration cycle and adjust the backwash time. The experimental results show that on the basis of increasing the filter load, the filtration period is prolonged from the current 55 h to 71 h, the head loss increases rapidly with time, the sewage intercepting filter layer moves down and the intercepting efficiency of the filter layer increases. Under different backwash conditions, the peak value of drainage turbidity basically occurs within 1 ~ 2 min after the start of gas flushing, and the peak value is related to the turbidity of the water to be filtered and the operating conditions, but the total flush required for drainage turbidity below 10 NTU The time is basically 10 ~ 11 min. Under the premise of ensuring water quality, the filtration period was prolonged to 71 h. The backwashing process consisted of aeration for 3 min, gas-water mixed flushing for 5 min and water washing for 5 min, followed by aeration for 2 min, gas-water mixed flushing for 4 min and water washing min. Through optimization, each filter can save 27,000 yuan per year, the energy-saving effect is more obvious, with good economic and social benefits.