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| rooting; striking | |||
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| digestion sewage, The reduction in volume and the decomposition of highly putrescible organic matter to relatively stable or inert organic and inorganic compounds. Sludge digestion is usually done by aerobic organisms in the absence of free oxygen; sludge fermentation | |||
| steeping | |||
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rotning : 1 短语, 1 学科 |
| 环境 | 1 |