Water recycling for agricultural irrigation
water reuse for agricultural irrigation
Water shortages, deterioration of water quality, and environmental
constraints, have led to an increased interest of treated wastewater in many
parts of the world. The major problem in wastewater recycling is the water
quality requirements, which become more and more stringent, and the cost
associated with achieving this quality.
Normally municipal wastewater (instead of industrial wastewater)
effluent is used for agricultural water reuse. Water recycling for
agricultural applications is mostly used in arid regions.
Agricultural reuse is advantageous because wastewater treatment
requirements are often moderate, wastewater contains plant nutrients and soil
amendments, agricultural areas may be adjacent to treatment plants, and
income is gained by growing cash crops.
The major contamination problems are percolation of nitrate to
groundwater, and retention of heavy metals in the soils, and pathogenic
hazards to farm workers. [1]
To remove organic compounds from the effluent, biological treatment
can be used, followed by deep-bed sand filtration, for the removal of heavy
metals. [2]
Further disinfection is needed for the elimination of pathogens. This
can be done by means of;
Ozone treatment: Ozone treatment can be used to disinfect the
drain water. Ozone is the second most powerful sterility in the world and its
function is to destroy bacteria, viruses and odors. An ozone supply of 10
g/h/m3 water with an exposure time of 1 h is sufficient to kill all
pathogens.
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Information sources for irrigation
water quality find below:
[1] Hammer, M.J. Hammer, M.J. Jr.
Water and wastewater technology, New Jersey, USA, 1996.
[2] Brenner, A. Shandalov, S.
Oron, G. Rebhun, M. Deep-bed filtration of SBR effluent for agricultural
reuse - pilot plant screening of advanced secondary and tertiary treatment
for domestic wastewater. Haifa, Israel 1994
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Should you know of any other interesting or more recent book, report, article or publication, concerning water reuse please let us know, so that we can include reported case-studies in the above overview |
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