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| DOI： |
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| Hydraulic Performance of Screen and Disc Filters for Drip Irrigation |
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QIN Tianyun, WANG Wen’e, HU Xiaotao
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College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China
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| Abstract: |
| The normal operation and service life of drip irrigation system were directly affected by the performance of the filter. The disc and screen filter were taken as the subjects. The head loss and filtration performances experiments of two kinds of filters with different meshes were conducted under the conditions of clean water and three kinds of muddy water with different flows. Factors and mutual relations that influenced the filter’s hydraulic performance were analyzed. The results showed that under the clean water condition, the filter’s head loss increased with the increase of the flow that could be described with a quadratic parabola, head loss of filter with larger mesh number was greater when the flow rate was constant. Under muddy water conditions, the filter’s head loss was related to the flow variation and sediment concentration. With the increase of flow and sediment concentration, the higher the initial head loss was, the shorter the filtration cycle was. Under the same conditions, the disc filter’s head loss and sediment removal rate were both obviously higher than the screen’s. In a conclusion, the hydraulic performances of screen filters were better than the disc filter’s, and the sediment removal capacity of disc filter are better than screen filter. |
| Key words: filter; head loss; clogging; drip irrigation |
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