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Effect of ozonation and ultrasonication pretreatment processes on co-digestion of tannery solid wastes

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Abstract

Studies were carried out by the application of ozonation and ultrasonication as pretreatment processes on primary and secondary sludge generated during treatment of tannery wastewater to enhance the soluble chemical oxygen demand (SCOD). Further, co-digestion (simultaneous digestion of two or more substrates) studies were carried out in batch reactors using the fleshings (a solid waste generated during the processing of raw hides or skins into finished leather) along with the primary and the secondary sludge wherein biogas generation was compared with and without pre-treated sludge using ozone and ultrasonication processes, respectively. It was found that, application of pretreatment processes enhanced biogas generation by 45% in the case of ozone pre-treated sludge and 53% by ultrasonication processes, respectively, in conjunction with the fleshings. However, considering the optimum contact time required, application of ultrasonication as a pretreatment process was found to be the most appropriate and viable process to enhance the SCOD. This pretreatment process has the potential for implementation in tanneries using the shortest possible ultrasonication time to minimize energy cost when compared with ozonation time.

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Acknowledgments

Authors are thankful to the Director, Central Leather Research Institute (CLRI), Adyar, Chennai, India for permitting to publish this work.

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Authors and Affiliations

  1. Environmental Technology Division, Central Leather Research Institute (CLRI), Adyar, Chennai, 600020, India

    K. Sri Bala Kameswari &  Chitra Kalyanaraman

  2. Centre for Environmental Studies, Anna University, Chennai, 600025, India

    K. Thanasekaran

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  1. K. Sri Bala Kameswari
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  2. Chitra Kalyanaraman
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  3. K. Thanasekaran
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Correspondence to K. Sri Bala Kameswari.

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Sri Bala Kameswari, K., Chitra Kalyanaraman & Thanasekaran, K. Effect of ozonation and ultrasonication pretreatment processes on co-digestion of tannery solid wastes. Clean Techn Environ Policy 13, 517–525 (2011). https://doi.org/10.1007/s10098-010-0334-0

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