大量研究表明，污泥中某些丝状菌或放线菌的过度增殖是造成活性污泥工艺中泡沫问题的主要原因。
The foam is caused by the excessive growth of some filamentous bacteria and actinomycetes in activated sludge mixed liquor.
球衣菌是一种具有典型鞘结构的丝状细菌，广泛存在于活性污泥以及受污染的水体中。
Sphaerotilus is a kind of filamentous bacterium with typical sheath forming. It occurs mainly in activated sludge and polluted water.
活性污泥法是采用最普遍的污水处理工艺，而丝状菌污泥膨胀则是该工艺污水运行中易发生、危害大的问题。
Activated sludge process used most widely in wastewater treatment plant is often accompanied by filamentous bulking which happens readily and harms the operation of activated sludge process seriously.
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