In this study, waste activated sludge obtained from two full‐scale treatment plants with foaming issues was pretreated with acid/alkali treatment, acid‐phase fermentation, thermal treatment, ultrasonic treatment and metal salt treatment to investigate their effect on foam mitigation. Waste activated sludge was characterized for foaming index prior and after each pretreatment method. Among all pretreatment methods investigated, acid/alkali treatment and acid phase fermentation showed highest reduction of 53% in foaming and in inactivation of Gordonia amarae filaments. Pretreatment methods that resulted in sharp decrease in the foaming index concurred with higher amounts of dead foam formers as confirmed using live/dead staining and the PMA‐qPCR technique. Pretreating with iron(III)chloride gave good foaming reductions with 54% decrease in foaming potential at a concentration of 260 mg/L but did not result in a decline of foam formers as confirmed by live/dead staining. Ultrasonic treatment did not prove effective in lowering the foaming index or killing the G. amarae filaments.

中文翻译：

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废物活性污泥预处理方法对厌氧消化中降低Gordonia泡沫潜力的影响

在这项研究中，对从两个满规模处理厂产生的有泡沫问题的废活性污泥进行了酸/碱处理，酸相发酵，热处理，超声处理和金属盐处理预处理，以研究其对泡沫缓解的影响。在每种预处理方法之前和之后，对废活性污泥的泡沫指数进行表征。在研究的所有预处理方法中，酸/碱处理和酸相发酵显示起泡和and草灭活的最大减少量达53％细丝。经活/死染色和PMA-qPCR技术证实，导致泡沫指数急剧降低的预处理方法与大量死泡沫形成剂同时存在。用氯化铁（III）预处理可以很好地减少起泡沫，在260 mg / L的浓度下起泡潜力降低了54％，但经活/死染色证实，泡沫形成剂没有减少。超声处理未证明可有效降低泡沫指数或杀死a豆变形菌丝。