Enhanced sludge solubilization by microbubble ozonation.
Enhanced sludge solubilization by microbubble ozonation.
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DOI：
10.1016/j.chemosphere.2008.01.054
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发表时间：
2008-05
期刊：
影响因子：
8.8
通讯作者：
Libing Chu;Sangtian Yan;X. Xing;Anfeng Yu;Xulin Sun;B. Jurcik
中科院分区：
文献类型：
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作者：
Libing Chu;Sangtian Yan;X. Xing;Anfeng Yu;Xulin Sun;B. Jurcik
提出了一种微泡臭氧氧化工艺，以提高污泥的溶解性，并与传统的臭氧泡接触器进行了比较。微泡被定义为直径小于几十微米的气泡。已有研究表明，微气泡可以促进羟基自由基的生成，从而提高染料废水的臭氧化效果。研究结果表明，微泡臭氧氧化能有效提高臭氧利用率，改善污泥溶解性。当接触时间为80 min时，微泡系统的臭氧利用率大于99%，而鼓泡接触器的臭氧利用率从94%逐渐下降到72%。微泡系统中微生物的灭活速度明显快于常规系统。在臭氧剂量为0.02g O3 g − 1 TSS时，微泡系统中约80%的微生物被灭活，而气泡接触器中约50%的微生物被灭活。在相同臭氧投加量下，微泡系统可使污泥中的COD和总氮释放到上清液中的量是鼓泡系统的2倍以上，总磷释放到上清液中的量是鼓泡系统的8倍以上。微气泡技术在臭氧化工艺中的应用为污泥减量化提供了一条有效、低成本的途径。
A microbubble ozonation process for enhancing sludge solubilization was proposed and its performance was evaluated in comparison to a conventional ozone bubble contactor. Microbubbles are defined as bubbles with diameters less than several tens of micrometers. Previous studies have demonstrated that microbubbles could accelerate the formation of hydroxyl radicals and hence improve the ozonation of dyestuff wastewater. The results of this study showed that microbubble ozonation was effective in increasing ozone utilization and improving sludge solubilization. For a contact time of 80min, an ozone utilization efficiency of more than 99% was obtained using the microbubble system, while it gradually decreased from 94% to 72% for the bubble contactor. The rate of microbial inactivation was obviously faster in the microbubble system. At an ozone dose of 0.02g O3g−1TSS, about 80% of microorganisms were inactivated in the microbubble system, compared with about 50% inactivation for the bubble contactor. Compared to the bubble contactor, more than two times of COD and total nitrogen, and eight times of total phosphorus content were released from the sludge into the supernatant by using the microbubble system at the same ozone dosage. The application of microbubble technology in ozonation processes may provide an effective and low cost approach for sludge reduction.