Experimental Research on Resistance Characteristics of Filtering Materials of Biofilter Process of Sludge Composting Plants

A lot of hazardous gases will be produced during sludge composting, if treated improperly, pollution may be caused to the environment. Biofilter process is an effective deodorizing method. But the resistance of biofilter materials that in turn have critical effects on whether the ventilation system of the workshop can operate normally. The research group conducts researches on resistance characteristics of four commonly used filter materials in a view to helping similar sludge composting plants in designing ventilation system, choosing fans, and managing operation. The results of the researches show that biofilter material is of the law of high-speed non-Darcy flow, their resistance characteristics are related with the characters, superficial velocity, bed thickness, etc., of the filter material, about which the empirical computation formulas are given.