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| DOI：10.13522/j.cnki.ggps.2019354 |
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| Experimental Study on Influencing Factors of Filtration Effect of Sand Filter |
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ZHANG Wenzheng, CAI Jiumao, LYU Mouchao, ZHAI Guoliang
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1.Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China)2. Key Laboratory of Water-saving Irrigation Engineering, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China
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| Abstract: |
| 【Objective】This paper is to study the effect of different factors on the filtration effect of sand filter.【Method】The indoor filtration model hydraulic test was carried out, under different filter layer thickness, the sand concentration of raw water and the filtration speed, and the turbidity, particle content and head loss of the filtered water samples were measured. 【Result】The results showed that with the increase of the filter layer, the turbidity of the water sample after filtration showed a decreasing trend. The change of the sand concentration of raw water was positively correlated with the turbidity of the filtered water sample, and the change of the filtration rate had a weak effect on the turbidity. The particle content of water sample under the condition of filter layer thickness 60 cm was significantly different from other thicknesses. The water sample particle content was significantly different from other sand concentration of raw water under the condition of sand concentration of raw water of 0.8‰, and the filtration rate had the weak effect on the particle content. The filtration rate is positively correlated with the head loss. The difference of head loss is not significant under different filter layer thickness. The difference of head loss is significant under different sand concentration of raw water conditions.【Conclusion】 It can be seen that the filter layer thickness and the concentration of raw water have significant effects on the turbidity and particle content of the water samples, and the effect of the filtration rate is weak. The filtration rate and the sand concentration of raw water have a significant effect on the head loss, and the effect of filter thickness is weak. |
| Key words: filter; filter layer thickness; filtration rate; turbidity; particle concentration; head loss |
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