The presence of organic compounds in the waste liquor is of serious environmental concern that has plagued the development of alumina industry (Bayer Process). The present work attempts to develop a green and efficient process for removal of organics utilizing combined effect of sonolysis and ozonation (US/O). The effects of reaction duration, ozone concentration and ultrasonic power are assessed for sonolysis (US), ozonation (O) and combination of sonolysis and ozonation (US/O). The optimal conditions for US/O treatment system is identified to be a reaction duration of 7 h, ozone concentration of 7.65 g/h, and ultrasonic power of 600 W. The total organic carbon (TOC) removal and decolorization are 60.13% and 87.1%, respectively. The process can be scaled-up to industrial scale, which could potentially serve to be a convenient, safe and sustainable alternative to the exisiting treatment technologies. Additionally, the treated waste water can be reused contributing to an improvement in the overall economics.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9352555 | PMC |
| http://dx.doi.org/10.1016/j.ultsonch.2022.106106 | DOI Listing |
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