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Effects of Detergent Formulation on Wastewater Characteristics and Treatment

Earl E. Shannon
Journal (Water Pollution Control Federation)
Vol. 47, No. 10 (Oct., 1975), pp. 2371-2383
Stable URL: http://www.jstor.org/stable/25038382
Page Count: 13
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Effects of Detergent Formulation on Wastewater Characteristics and Treatment
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Abstract

Wastewater characteristics and performance of the activated sludge treatment plant at a Canadian Forces station were monitored under baseline (consumers using existing detergent formulations), nitrilotriacetic acid, carbonate, high phosphate, and citrate laundry detergent substitution conditions. Substitution of nonphosphate for existing detergents (<20 percent as ${\rm P}_{2}{\rm O}_{5}$) reduced the total phosphorus loading of the domestic wastewater by 24 percent. Nitrilotriacetic acid was significantly degraded (60 to 75 percent), whereas citrate essentially was completely (>95 percent) removed by treatment. Reduction in wastewater phosphorus levels results in a corresponding reduction in the dosage of alum and ferric chloride required to achieve 1 mg/l P residual. Laboratory-scale tests confirmed that nitrilotriacetic acid complexes of mercury, cadmium, and nickel degrade poorly within an activated sludge system.

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