Coagulation and settling of aerobic sewage sludge in seawater

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Abstract
The settling characteristics of aerobically treated sewage sludge from Middlesex, New Jersey were investigated. The data describe the rate of decrease in mass concentration for coagulating solids and subsequent settling rates in a column of seawater. Low turbulence values of 0, 2 and 4 sec‐1 and initial concentrations of 20 to 500 mg l‐1 were used. The rate and extent of clearing is greater for larger initial concentrations. Mass concentration decreased at a rate of 4%CO min‐1 at. 500 mg l‐1 initial concentration, but at only 0.5%5CO min‐1 for 20 mg l‐1. Twenty to 40% of the initial mass concentration remained in suspension for an indefinite period of time.

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