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JSIR Vol.70(08) [August 2011] >


Title: A greenhouse integrating desalination, water saving and rainwater harvesting for use in salt-affected inland regions
Authors: Davies, P A
Srivastava, R K
Kaphaliya, B
Hossain, A K
Igobo, O Ngoye
Garantziotis, G.
Keywords: Desalination
Greenhouse cultivation
Photovoltaic
Reverse osmosis (RO)
Salinity
Issue Date: Aug-2011
Publisher: NISCAIR-CSIR, India
Abstract: This study proposes a new type of greenhouse for water re-use and energy saving for agriculture in arid and semi-arid inlandregions affected by groundwater salinity. It combines desalination using reverse osmosis (RO), re-use of saline concentraterejected by RO for cooling, and rainwater harvesting. Experimental work was carried at GBPUAT, Pantnagar, India. Salineconcentrate was fed to evaporative cooling pads of greenhouse and found to evaporate at similar rates as conventional freshwater.Two enhancements to the system are described: i) A jet pump, designed and tested to use pressurized reject stream to re-circulatecooling water and thus maintain uniform wetness in cooling pads, was found capable of multiplying flow of cooling water by afactor of 2.5 to 4 while lifting water to a head of 1.55 m; and ii) Use of solar power to drive ventilation fans of greenhouse, for whichan electronic circuit has been produced that uses maximum power-point tracking to maximize energy efficiency. Re-use of ROrejected concentrate for cooling saves water (6 l d-1 m-2) of greenhouse floor area and the improved fan could reduce electricityconsumption by a factor 8.
Page(s): 628-633
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-1084 (Online); 0022-4456 (Print)
Source:JSIR Vol.70(08) [August 2011]

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