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nature : also known as fixed biofilm (fixed Biofilm process). Directed wastewater or other organic components into gases and microbial cells, attach to certain inert medium (such as gravel, slag, slag), and specially designed ceramic or plastic packing growing on the biological treatment process. Attachment growth can be divided into aerobic biological treatment process (commonly used in the filter, coarse filter, biological denitrification turntable and fixed bed reactor) can grow and anaerobic biological treatment process (commonly used in the anaerobic filter).
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