Abstract
The filter before a pump is a key piece of equipment of a micro-irrigation system, which can ensure safe and stable operation. This paper examines a pre-pump micro-pressure filter, using the trapped sediment mass and total filtration efficiency as the assessment indicators. Orthogonal experiments of the physical model of the inlet flow, sediment content, water separator type, and filter area were conducted. The experimental results were processed by analysis of variance, dimensional analysis, and multiple regression analysis. The influences of the factors affecting the trapped sediment mass in descending order were the sediment content, filter area, water separator type, and inlet flow. The influences of the factors affecting the total filtration efficiency in descending order were the filter area, sediment content, water separator type, and inlet flow. While the water separator type significantly affected the trapped sediment mass and total filtration efficiency, the difference between the different treatments was insignificant. The prediction model for the trapped sediment mass (total filtration efficiency) was established with an R2 of 0.998 (0.889). Since the relative errors between the predicted and measured values were less than 6%, these models could produce accurate predictions. These results provide technical support for the structural optimization and filtration mechanism of the filter and advance the theory of micro-pressure filtration.
Highlights
For a micro-irrigation system that relies on surface water as the irrigation water source, to prevent the irrigator from clogging, a sedimentation tank is usually set up to collect the sediment
Based on the research results of Puig-Bargues et al (2005) and Yurdem et al (2008), Duran-Ros et al (2010) utilized dimensional analysis to derive and formulate a new mathematical model of head loss that was more realistic after testing
The sediment content had the most significant impact on the trapped sediment mass under turbid water conditions (Table 5). This indicated that the sediment content was the most critical factor affecting the filter's trapped sediment mass, followed by the filter area, the water separator type, and the inlet flow
Summary
For a micro-irrigation system that relies on surface water as the irrigation water source, to prevent the irrigator from clogging, a sedimentation tank is usually set up to collect the sediment. Puig-Bargues et al (2005) established a general mathematical model for calculating the head loss of a mesh filter for micro-irrigation. They reported the consistency of the modelled head loss with the experimental data. By studying the factors affecting the filtration effects of sand filters, Zhang et al (2020) suggested that the thickness of the filter layer and the sediment content of the raw water could significantly affect the turbidity and particle mass concentration, while the filtration rate and sediment content of the raw water could considerably influence the head loss. The results showed that these three sand filters had insignificant effects on the proportion of complete clogging of the emitter
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