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| DOI： |
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| Experimental Study on the Efficacy of Sand Filter, Screen Filter and Disc Filter for Removing Silts from the Yellow River Water for Micro-Irrigation |
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ZHANG Wenzheng, ZHAI Guoliang, LV Mouchao, CAI Jiumao, DENG Zhong, ZONG Jie
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Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences/Key Laboratory of Water-Saving Agriculture of Henan Province, Xinxiang 453002, China
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| Abstract: |
| The objective of this paper was to investigate experimentally the efficiency and difference in using sand filter, disc filter and screen filter to remove the silts from Yellow River water under different filtration rates in a laboratory test. In each experiment, we measured the turbidity, particle concentration, head loss and flow rate after the filtration. The results showed that the turbidity and particle concentration in the sand filter were lower than that in the screen filter and disc filter; the particle concentration after filtered by the sand filter was relatively stable, while the turbidity filtering ratio, particle concentration and filtering ratio in the disc filter and screen filter were lower than that in the sand filter. Analysis of the particle size distribution showed that the sizes of the particles intercepted by the sand filter was uniform, while the screen filter and disc filter only intercepted large particles. Therefore, the sand filter was more efficient for removing particles. The water-head loss in the sand filter increased with time, while the head loss in the disc and screen filters was independent of time as there was less particle accumulation in them. For removing the silts from Yellow River water, the sand filter was superior to the screen and disc filters. |
| Key words: sand filter; screen filter; disc filter; particle concentration; head loss; particle size distribution |
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