Abstract
A suspended growth biological nutrient removal process was designed and operated to achieve high removal of organics, nitrogen and phosphorus from wastewater without the addition of chemicals. The process utilized anoxic, anaerobic and aerobic reactor sequences with sludge return. A bench‐scale unit was operated in the laboratory. The biological kinetic coefficients for removal of BOD5 were developed by varying the mean cell residence time. This was achieved by operating the reactors at six different MLSS concentrations, 5000, 4200, 3300, 2600, 1900, and 1200 mg/L. This process eliminated the need for an internal recycle; and total detention time for three reactors was less than that for conventional activated sludge.
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