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| Influence of muddy water mass fraction on performance of packed quartz sand bed |
| Deng Zhong, Zhai Guoliang, Zong Jie, Feng Junjie, Lü Mouchao, Li Ying, Cai Jiumao |
| Key Lab for Water-saving Agriculture of Henan Province, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, Henan 453002, China |
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Abstract A series of experiments were conducted on performance of a filter model with packed quartz sand bed applied in micro-irrigation by using muddy water respectively with four kinds of mass fractions: 0.3‰,0.5‰,0.8‰ and 1‰ to properly evaluate effect of sediments in the muddy water on clogging in that irrigation system. In those experiments, the variation of turbidity of filtrated water, change of sand grain size as well as the relationship between sand concentration and time were mea-sured. The results showed that the mass fraction of muddy water affected the turbidity and particle concentration in filtered water; particularly, the more mass fraction, the poorer the turbidity and the hi-gher sand concentration in filtered water. The turbidity of filtered water declined gradually after a filtration was lasted for 10 minutes for the muddy water with less than 0.8‰ mass fraction; however, when the mass fraction was increased to 0.8‰, the turbidity of filtered water showed a significant fluctuation even the water had been filtered for 10 minutes. Moreover, most the particles with a size larger than 0.1 mm had stayed in the filtering bed, fortunately there still were 2%-3% large size particles that had gone through the bed. For the muddy water with a mass fraction less than 0.5‰, the mass fraction of particles with a size smaller than 0.1 mm in the filtered water increased slowly, and the fraction of particles with a size larger than 0.1 mm was less 1%. The average filtration ratio of turbidity and decrease rate of sandy particle concentration showed a quadratic relation with a negative quadratic coefficient as the mass fraction of muddy water was increased; especially they had reached 56.69% and 57.61% respectively when the mass fraction was at 0.8‰. The muddy water with a higher mass fraction had a better filtration ratio and a larger decrease rate of sand concentration, but the filter bed could be jammed easily, reducing filtering effect and shortening filtration time.
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Received: 29 January 2013
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