Abstract
Conventional activated sludge treatment process has been widely employed to deal with a variety of municipal and industrial waste water, but the production of sludge by this method is considerable. It is urgent to find an appropriate method which can solve this problem. Shear force produced by rotating disk system (a cell lysis system) was employed to break cell wall of sludge microorganism in order to release intracellular materials which can be reused as nutrient materials for metabolism of other sludge microorganisms in this study. Special feature on surfaces of disks had been proved to be a novel improvement which can improve disintegration effect apparently. Ultrasonic system can further promote minimization of excess sludge after treatment by rotating disk system in shorter time.
Highlights
Activated sludge treatment process produces excess biomass as excess sludge which is difficult and expensive to dispose
Sludge management has been the main problem of waste water treatment plants (WWTPs) because it costs 60% of total plant capital cost [1]
With increasing public environmental demands, more and more WWTPs are building in China so as to improve water environment; large quantity of excess sludge as by-product which is unpleasant for its large volume and offensive odor makes huge stress on excess sludge treatment
Summary
Activated sludge treatment process produces excess biomass as excess sludge which is difficult and expensive to dispose. Sludge management has been the main problem of waste water treatment plants (WWTPs) because it costs 60% of total plant capital cost [1]. With increasing public environmental demands, more and more WWTPs are building in China so as to improve water environment; large quantity of excess sludge as by-product which is unpleasant for its large volume and offensive odor makes huge stress on excess sludge treatment. Incineration, ocean discharge, landfill, and composting are common sludge disposal methods used over many years. These common methods are no longer reliable because of economic constraint and negative effect on environment. More and more stringent regulations for excess sludge treatment have promulgated in developed countries; management and treatment of excess sludge have been one of the most stringent challenges in biological sewage treatment field [2]
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