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The filter media dimensions are the key design parameter in filter system. In this study, the ceramic pellets with diameter of 3-5 mm, 6-9 mm and 10-13 mm were employed in the vermifilters of D1, D2 and D3, respectively, for excess sludge treatment. The aim of this study was to optimize the diameter of filter media based on the stabilization degree of excess sludge and the corresponding physiological...
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