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

机译：臭氧和超声波预处理工艺对制革厂固体废物共消化的影响

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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.
机译：通过臭氧处理和超声处理对制革废水处理过程中产生的一级和二级污泥进行预处理，以提高可溶性化学需氧量（SCOD）进行了研究。此外，使用果肉（生皮或生皮加工成成品皮革过程中产生的固体废物）以及主要和次要污泥，在间歇式反应器中进行了共消化（同时消解两种或更多种底物）的研究，其中分别比较了使用臭氧处理和超声波处理的沼气产生与未处理污泥的产生。结果发现，采用臭氧预处理污泥的情况下，预处理方法的应用可将沼气的产生量提高45％，通过超声波处理结合肉体，可将沼气的产生量分别提高53％。然而，考虑到所需的最佳接触时间，发现超声处理作为预处理过程是增强SCOD的最合适和可行的过程。与臭氧化时间相比，这种预处理工艺有可能在制革厂中使用最短的超声处理时间来实现，以最大程度地降低能源成本。

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