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Treatment of winery wastewater in unplanted constructed wetlands
Expanded Title:This project builds on the experience gained from K5/1936 and focussed on the treatment of winery effluent, which is a critical to the wine industry in the Cape. The research focussed on the use of wetlands for the treatment of winery effluent. After consultation with the reference and the understanding that several of the natural wetlands treating winery effluent are unplanted wetlands i.e do not contain plants, it was decided to exclude plants from the systems because of the cumulative phytotoxic nature of the phenolics and salts found in winery wastewater. The term used in this project was biological sand filters. After running several unplanted constructed wetlands (BSF) for 3 years the following conclusions were reached: Reproducibility between replicates containing the same batch of sand was good, but the magnitude of differences were enough to warrant the use of duplicate systems for future studies Phillipi sand is a good candidate for use in biological sand filters treating winery wastewater from small cellars in the Cape Town environment. To optimize organic removal, including removal of acetate, it is recommended that winery wastewater is subjected to alternating redox environments. A polishing aeration step using gravity fed trickling filters provides a simple, low cost, low energy example of how this may be achieved. Degradation gradients caused by plug flow of influent ensure that the most ‘treated’ wastewater exits the biological sand filters first. If a polishing step to remove acetate is incorporated, a nominal hydraulic retention time of 2 hour may be sufficient. The results showed that trickling filters may indeed present a feasible option to ‘polish’ wastewater containing short chain volatile fatty acids. Currently, experimental columns have been filled with either aggregate, clay balls or open cell polyurethane foam, in an effort to determine which of these substrates would be best for acetate removal. Finally, it was concluded that biological sand filters (unplanted CW's) are promising systems for the treatment of winery wastewater with variable qualitative and quantitative flows
Date Published:01/03/2015
Document Type:Research Report
Document Subjects:Wastewater Management - Industrial
Document Keywords:Municipality, Pollution control
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:2104/1/14
ISBN No:978-1-4312-0647-6
Authors:Welz PJ; Ramond J-B; Cowan DA; Smith I; Palmer Z; Haldenwang R; Burton S; Le Roes-Hill M
Project No:K5/2104
Originator:WRC
Organizations:Cape Peninsula University of Technology; University of Pretoria; University of the Western Cape
Document Size:2 246 KB
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