| 摘要 |
A composite support medium for bacteria in sewage treatment plants comprises two intimately associated quantities of media having disparate surface area to volume ratios; in particular a core body of tangled plastics wire-like filaments welded together and having an area to volume ratio of from 60 to 80 square meters per cubic meter partly wrapped in a mat of tangled plastics textile type filaments welded together having an area to volume ratio of from 350 to 450 square meters per cubic meter.
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