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‐1and initial concentrations of 20 to 500 mg l‐1were used. The rate and extent of clearing is greater for larger initial concentrations. Mass concentration decreased at a rate of 4COmin‐1at. 500 mg l‐1initial concentration, but at only 0.55COmin‐1for 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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