Reduction of ozone dosage by using ozone in ultrafine bubbles to reduce sludge volume
Reduction of ozone dosage by using ozone in ultrafine bubbles to reduce sludge volume
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DOI：
10.1016/j.chemosphere.2021.129922
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发表时间：
2021-02-15
期刊：
影响因子：
8.8
通讯作者：
Motoshige, Hiroshi
中科院分区：
文献类型：
--
作者：
Hashimoto, Kurumi;Kubota, Narumi;Motoshige, Hiroshi
污泥臭氧化是一种有效的污泥减量技术，可促进污泥的溶解和分解。然而，如果要广泛采用这项技术，就必须减少与臭氧产生有关的能源消耗。我们使用超细气泡（UFB）作为臭氧载体，以确定它们的使用是否可以提高臭氧处理的效率并减少所需的臭氧剂量。我们使用了一个螺旋，液体型UFB发生器，它可以直接引入UFB到污泥悬浮液。以污泥中细菌的死亡率作为污泥减量的指标。UFB减少了臭氧需求。实现80%的死亡率所需的臭氧消耗量为15 mg-O-3/g-MLSS在污泥中与UFB提供的臭氧处理与25和45 mg-O-3/g-MLSS在污泥中与臭氧供应作为螺旋，液体型微泡和扩散器，分别。在相同的臭氧消耗速率下，UFBs臭氧化水与污泥混合时，污泥絮体表面至内部的死细胞层深度大于UFBs臭氧化水。UFB中的臭氧杀死絮凝物中的细菌。然而，在UFB发生器中的剪切力的污泥絮体的破碎作出了更大的贡献，在污泥中的细菌死亡的加速与UFB提供的臭氧处理。(C)2021爱思唯尔有限公司版权所有。
Sludge ozonation, which promotes sludge disintegration and solubilization, is a promising technology for reducing waste sludge volume from biological wastewater treatment process. However, if this technology is to be widely adopted, reducing the energy consumption associated with ozone generation will be necessary. We used ultra-fine bubbles (UFBs) as ozone carriers to determine if their use could improve the efficiency of ozone treatment and reduce the ozone dose required. We used a spiral, liquid-type UFB generator, which can introduce UFBs directly into a sludge suspension. The death ratio of bacteria in sludge was used as an indicator of sludge reduction. The ozone requirement was reduced by UFBs. The ozone consumption required to achieve a death ratio of 80% was 15 mg-O-3/g-MLSS in the sludge treated with ozone supplied by UFBs versus 25 and 45 mg-O-3/g-MLSS in sludges treated with ozone supplied as a spiral, liquid-type microbubbles and by a diffuser, respectively. When mixing water ozonated with UFBs with sludge, the depth of the dead cell layer from the surface to the interior of the sludge floc was larger than that of ozonated water lacking UFBs at the same rate of ozone consumption. Ozone in UFBs kills bacteria inside the flocs. However, the fragmentation of sludge flocs by shear forces in the UFB generator made a larger contribution to the acceleration of bacterial death in sludge treated with ozone supplied by UFBs. (C) 2021 Elsevier Ltd. All rights reserved.