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Thermal pretreatment of concentrated distillery spent wash

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A novel thermal pretreatment reported earlier was employed to treat concentrated distillery spent wash to reduce the quantity to be handled at high pressure and high temperature involved in the proposed process. Three types of concentrated wastes, namely, high molecular weight high COD fraction obtained after membrane filtration of distillery waste, concentrated wastes obtained from distillery employing indirect heating, and concentration by partial evaporation of spent wash under vacuum, were studied to establish suitability of the proposed process for concentrated wastes. Thermal pretreatment at 230°C for 2 hours resulted in formation of charred residue having properties like lignite coal. The reduction in COD of the liquid phase was due to the separation of residue. Effect of dilution by treated waste on pretreatment was studied to estimate backmixing effect. Attempts were made to evaluate performance of different concentrated wastes in terms of extent of COD reduction, net energy recovery, and biodegradability. Other operational parameters, such as filterability, total pressure, and ease of handling of residue, were also evaluated. Thermal pretreatment of membrane-filtered, concentrated fraction appeared to be promising.

Keywords: anaerobic digestion; distillery; energy recovery; industrial waste; pretreatment; thermal treatment; treatability

Document Type: Research Article


Publication date: 1992-05-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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