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Volume :13 Issue : 2 1986      Add To Cart                                                                    Download

Chemical evaluation of treated sewage and brackish waters for irrigation

Auther : FAWZIA AL-RUWAIH

Department of Geology, University of Kuwait, P.O. Box 5969, Kuwait

 

ABSTRACT

 

Treated sewage water from the Al-Ardheyah sewage works and brackish water from two

underground water well fields have been chemically evaluated for their suitability for irrigation. Chemical analyses involve determination of common cations, anions, boron, and trace elements. Suitability of irrigation water depends mainly upon salinity hazard, sodium adsorption ratio, and boron concentration. In addition, some trace elements such as Cu, Ni, Cd, Pb and Zn were determined and assessed. Although the salinity of treated sewage water appears to be less than that of brackish waters, both are rated as being of very poor quality. Because of the salinity hazard, continuous irrigation with such waters will increase the problem of substrate permeability. Although these waters are classified as medium sodium waters, and hence would present an appreciable sodium hazard to fine textured soil, they have, nevertheless, been used successfully in irrigation in Kuwait where the soil is sandy. The water produced by tertiary treatment is also considered very saline, but has low concentrations of sodium, so it can be used for irrigation on almost all soils.

 

Boron concentration of treated sewage water ranges from 1.2 to 1.8 mg/l whereas that for brackish water is 1.5 mg/l, and does not exceed the permissible limit recommended for semitolerant and tolerant crops. It could also be used, with care, for semi-sensitive crops. Trace element concentrations in treated sewage water are lower than those in brackish water, and trace elements in both types of water are low enough to ensure their safe use in irrigation.

 

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