TREATMENT AND PRETREATMENT REQUIREMENTS FOR INDUSTRIAL WASTEWATERS INMUNICIPAL ACTIVATED-SLUDGE PLANTS

Industrial wastewaters may have a significant impact on municipal acti vated sludge plants. Depending on the degradability of the wastewater, the overall reaction coefficient, K, may be increased or decreased. R eadily degradable wastewaters will render the process more susceptible to filamentous bulking. Increasing the soluble BOD fraction will incr ease the temperature effect. Sludge dewaterability may be decreased wi th readily degradable soluble wastewaters or increased with pulp and p aper mill wastewaters containing pulp and fibre. Volatile organics whi ch do not biodegrade require source treatment. Effluent toxicity shoul d be controlled by industrial pretreatment where possible. In some cas es, PAC will eliminate toxicity in the activated sludge process.