... 易生物降解物质 readily biodegradable substances 回流活性污泥 returned activated sludge 鲑类（鱼）salmonid（fish） ...
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Simultaneously, the excess activated sludge that drained from the sediment pool returned the hydrolysis- acidification pool could be degraded, so the treatment cost of sludge could be lower.
同时，把二沉池排出的污泥回流至水解酸化池进行污泥减容化，还可以降低污泥的处理成本。
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