Abstract
The design method for CSTR (continuous-stirred-tank-reactor) systems was briefly reviewed, and numerical methods and batch kinetic diagrams were developed for the batch treatment system design. Batch systems require less aeration time to achieve a certain effluent quality than CSTR systems. The relative efficiency of CSTR (the ratio of aeration time in batch systems to that in CSTR systems to achieve a given effluent quality) is dependent mainly on the influent to effluent quality ratio. The relative efficiency of CSTR decreases as the influent to effluent quality ratio increases: if an effluent quality of 5 mg l −1 TOC of phenol is required with 3000 mg l −1 of initial VSS (volatile suspended solids) available, the efficiency is 0.7 for 10 mg l −1 influent, 0.27 for 50 mg l −1 influent, and 0.05 for 500 mg l −1 influent.
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