不同工况下砂石过滤器对黄河水和再生水过滤性能影响

为了了解不同水源条件下砂石过滤器的过滤性能,选取黄河水及再生水2种典型滴灌水源,测试了3种粒径石英砂滤料,5种滤速条件下砂石过滤器颗粒物去除率和水头损失,重点对比了2种水源下砂石过滤器过滤性能的差异.研究发现:砂石过滤器对再生水的浊度去除效果优于黄河水,浊度去除率提高5.95%~65.30%.在黄河水条件下,砂石过滤器水头损失大于再生水,水头损失增加了34.90%~68.40%;随着运行时间的增加,砂石过滤器对再生水的浊度去除率缓慢上升,而对黄河水的浊度去除率呈先升后降趋势;随过滤流速增加,砂石过滤器对再生水的浊度去除率呈先增后减趋势,而对黄河水的浊度去除率随流速增加并未有明显变化;黄河水条件下砂石过滤器的过滤参数建议选择粒径1.00~1.70 mm,过滤流速0.012 m/s,再生水建议选择粒径1.70~2.35 mm,过滤流速0.015 m/s.结果为不同水质条件下过滤器的选择提供一定参考.

Effect of sand filter on filtration performance of Yellow River water and reclaimed water under different operating conditions

In order to understand the filtration performance of the sand filter under different water source conditions, two typical drip irrigation water sources, Yellow River water and reclaimed water, were selected to analyze the particle removal rate and head loss of sand filter by using particle of three different sizes and five filtration rates. The difference of the filtration performance of the sand and filter under two water sources was emphatically compared. The results shows that: the removal effect of sand filter on turbidity of reclaimed water is better than that of Yellow River water, and the turbidity removal rate is increased by 5.95%-65.30%. Under the Yellow River water condition, the head loss of sand filter is greater than that of reclaimed water, and the head loss is increased by 34.90%-68.40%. With the increase of operating time, the turbidity removal rate of sand filter on the reclaimed water increases gradually, while the turbidity removal rate of sand filter on yellow river water did not change significantly. With the increase of filtration velocity, the turbidity removal rate of reclaimed water sand filter increased first and then decreased, while the turbidity removal rate of yellow river water sand filter remains unchanged. Based on the results of this study, under the condition of yellow river water, it is strongly recommended to select the filtration parameters of sand filter with particle size between 1.00-1.70 mm and filtration velocity of 0.012 m/s. As for reclaimed water, it is recommended to select particle size of between 1.70-2.35 mm and filtration velocity of 0.015 m/s. The results can provide theoretical reference for the selection of filtration system under different water quality conditions.