Backwashing performance of self-cleaning screen filters in drip irrigation systems


Autoři: Quanli Zong aff001;  Zhenji Liu aff002;  Huanfang Liu aff002;  Hongfei Yang aff002
Působiště autorů: School of Resource and Environment, Qingdao Engineering Research Centre of Rural Environment, Qingdao Agricultural University, Qingdao, China aff001;  College of Water Conservancy and Civil Engineering, Shihezi University, Shihezi, China aff002
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
doi: 10.1371/journal.pone.0226354

Souhrn

The self-cleaning screen filter is one of the most common types used in drip irrigation systems. Backwashing pressure difference and backwashing time for two screen filters with one geometry and two different screens (178 μm and 124 μm) using two water qualities (tap water and sand–water mixture) were studied in a total of 88 runs (42 runs for tap water, 22 and 24 filtration cycles for sand–water mixture and backwashing, respectively). The backwashing pressure difference and backwashing time were calculated using the experimental data, and the results were largely in the range of measured values. Three constraint conditions (flowrate, sand condition and filtration time) of backwashing pressure difference were analysed, and the optimal values of backwashing pressure difference were given as 60.0 and 70.0 kPa for 178 μm and 124 μm filters, respectively. The backwashing time of the screen filter should be an optimal value that ensures that the pressure difference between the internal and external surfaces of the screen decreased to the initial value, and the sand concentration of the backwashed outlet decreased to a small, stable value. Based on the results of the backwashing experiment and prototype observation, the optimal backwashing time was given as 30 to 45 s for both screen filters.

Klíčová slova:

Deformation – Drip irrigation – Flow rate – Laminar flow – Porosity – Prototypes – Water quality – Reynolds number


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