Sand filter performance on drip irrigation with the Yellow River
ZHANG Jiewu1, FENG Ji2, XU Feipeng2, MO Fangyuan2
1.Gansu Ruisheng-Yamit Hight-tech Agriculture Co., Ltd., Lanzhou, Gansu 730000, China; 2. College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China
Abstract：The Yellow River undisturbed sediment was used to collocate the test water. The filter performance was tested with homogeneous quartz of different particle sizes under different filtration velocities. The results show that head loss increases with the time increasing. The water head loss is on the rise when the flow velocity increases under the same filter material particle size. The water turbidity decreases with the time increasing. The water turbidity decreases after an increase with flow velocity increasing. The particles of different sizes which are adsorbed by the filter surface or pass through the gaps increase with the velocity increasing, therefore the head loss increases with the increase of the speed and degree of clogging. The particle filter surface area decreases with particle size increasing and the gaps among the filter particles increase. The retention and adsorption capacity of filter material for the particles decrease and the head loss can be reduced. Since the filter material loses the ability to re-adsorb other impurities, after running for some time various impurities were attached to the filter material surface, the turbidity removal decreases. This research provides a theoretial basis for the optimal filter mode selection for the Yellow water drip irrigation.
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