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| DOI：10.13522/j.cnki.ggps.2017.0572 |
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| Experimental Study on the Feasibility of Using Glass Beads as Micro-irrigation Filter |
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ZHAO Pengfei, ZHAI Guoliang, DENG Zhong, CAI Jiumao, ZHANG Wenzheng
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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; .Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China； Key Laboratory of Water-saving Irrigation Project, Ministry of Agriculture, Xinxiang 453002, China
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| Abstract: |
| 【Objective】 This paper is to examine the feasibility of using micro glass beads as micro-irrigation filter. 【Method】 We experimentally studied the impact of different initial filtration rates and sediment concentrations on instant effluent flow rate, pressure drop between the inlet and outlet of the filter, and turbidity of the effluent. 【Result】 When the initial filtration velocity was 0.015 m/s, an increase in sewage concentration had a significant effect on effluent turbidity. When the filtering speeds were 0.020 m/s, 0.025 m/s and 0.030 m/s, an increase in sewage concentration had a noticeable effect on the effluent turbidity in the early stage. Under the same sewage concentration, an increase in initial filtration velocity increased the instant effluent flow rate in a filtration cycle, while under the same initial filtering velocity, an increase in sewage concentration increased the amount of effluent flow rate in one filtration cycle. Under the same filtration velocity, the pressure drop between the inlet and outlet of the filter increased with the sewage concentration. With the filtration flow rate increasing, the pressure drop across the filter decreased as seepage concentration decreased. 【Conclusion】 The glass beads purified water mainly by intercepting solid particles in the early stage. With the accumulation of the particles in the filter, the effluent turbidity, instant flow rate of the effluent, and the pressure drop across the filter were stabilized, after which the filter purified the water mainly by interception and adsorption. |
| Key words: glass microspheres; filter; filtration velocity; pressure drop |
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