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Drip Irrigation and Fertigation for Horticultural Crops: Scope, Principle, Basic Components, and Methods
Published in Ajai Singh, Megh R. Goyal, Micro Irrigation Engineering for Horticultural Crops, 2017
Filters and pumps: Sand media filters have been used extensively for micro irrigation systems. Screen filters and disk filters are common as alternatives or for use in combination with sand media filters. Sand media filters provide filtration to 200 mesh, which is necessary to clean surface water and water from open canals for drip irrigation. These water sources pick up a lot of fine grit and organic material, which must be removed before the water passes through the drip tape emitters. Sand media filters are designed to be self-cleaning through a “backflush” mechanism. This mechanism detects the drop in pressure due to the accumulation of filtered particles. It then flushes water back through the sand to dispose of clay, silt, and organic particles. Sand used for filters should be between sizes 16 and 20 to prevent excess back flushing. To assure enough clean water for back flushing, several smaller sand media filters are more appropriate than a single large sand media. In addition to a sand media filter, a screen filter can be used as a prefilter to remove larger organic debris before it reaches the sand media filter, or as a secondary filter before the irrigation water enters the drip tube.
Planning, Layout and Design of Drip Irrigation System
Published in Megh R. Goyal, Balram Panigrahi, Sudhindra N. Panda, Micro Irrigation Scheduling and Practices, 2017
Screen filters are always installed for final filtration as an additional safeguard against clogging. While majority of impurities are filtered by sand filter, minute sand particles and other small impurities pass through it. The screen filter contains screen strainer, which filters physical impurities and allows only clean water to enter into the micro irrigation system. The screens are usually cylindrical and made of noncorrosive metal or plastic material. These are available in a wide variety of types and flow rate capacities with screen sizes ranging from 20 mesh to 200 mesh. The aperture size of the screen opening should be between one seventh and one tenth of the orifice size of emission devices used.
Performance of a novel vertical flow constructed wetland for greywater treatment in rural areas in Jordan
Published in Environmental Technology, 2020
Suhaib G. Abunaser, Arwa Abdelhay
Finally, the treated water, which was percolating from the bottom container followed two routes either it was collected in a collection barrel and pumped afterward by a submersible pump through a screen filter to be used for irrigation (frequency: 1time/day) or it was recycled back to the grease and fat separation barrel. The recycling aim was to lower the organic load of the raw greywater by dilution [29] and to maintain the filter media wet in particular during flow-suspended periods (maintenance and nighttime).
On the drying process of molded pulp products: Experiments and numerical modelling
Published in Drying Technology, 2020
Mattia Didone, Sankhya Mohanty, Jesper Henri Hattel, Mads Rostgaard Sonne, Elisabetta Maria Fiordaliso, Alessandro Checchi, Guido Tosello
The preformed molded samples were placed at the bottom of the laboratory-scale thermoforming machine, on top of a fine metal wire mesh. Underneath it, a rigid metal screen filter disk gave support to the metal wire mesh. This arrangement (as shown in Figure 4) was laid on top of the base support, below which suction via vacuum was operated for venting the water/steam in excess.