A city in a semiarid region plans to reuse wastewater for agricultural irrigation. The soils at the proposed irrigation site are composed of poorly drained alkaline loams underlain by dense, clayey strata. The groundwater is unsuitable for potable use because of naturally occurring high salt and nitrate contents. The proposed crops include alfalfa, barley, corn, cotton, grain sorghums, and grasses. What kind of wastewater treatment is necessary, and what quality standards must be met for this reuse application? (Assume the wastewater is primarily from domestic water use and the concentrations of heavy metals, boron, and toxic chemicals are negligible.) What controls are necessary for operation of the irrigation site?
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