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The excess activated sludge is usually directly dewatered without digestion in most municipal wastewater treatment plants, which will pose potential threat to ecological environment due to its high content of organic matter. Therefore, there are the needs of centralized digestion of these dewatered sludges. The process of anaerobic digestion of sludge is restricted by its hydrolysis process, so the...
Based on the principle of flocculation kinetics, and integrated the structure of radiant sedimentation tank (RST) and the elementary theory of particles sedimentation, hydraulic agitation is taken to realize the coagulating sedimentation after addition chemicals. Meanwhile, CFD software Fluent is used to research with numerical method the operation characteristics of conventional RST. On this basis,...
Ultrasonic treatment has been adopted as a strategy to accelerate the hydrolysis step of waste activated sludge. The chemical characteristics of WAS under various sonication time and energy intensities during ultrasonic treatment were investigated in this study. Results showed that SCOD and ammonium nitrogen concentration and temperature of sludge increase as a function of both sonication time and...
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