A pilot plant combining dissolved air flotation, anaerobic degradation in an expanded granular sludge bed (EGSB) reactor and aerobic post-treatment in a vertical flow constructed wetland has been used to treat tapioca starch wastewater for more than 2.25 years. It is demonstrated that organic matter (chemical oxygen demand by >98%), nitrogen (Kjeldahl-N by >90%) and cyanide (total cyanide by >99%) can be removed very efficiently under stable operating conditions. The removal efficiency for phosphorus is lower (total-P by 50%). The treatment concept, which includes several sustainable aspects, e.g. production of energy to be used on-site, low operation demands and minimal use of chemicals, could be interesting for small- and middle-sized tapioca processing plants.
Treatment of tapioca starch wastewater by a novel combination of physical and biological processes
J. Fettig, V. Pick, U. Austermann-Haun, M. Blumberg, N. V. Phuoc; Treatment of tapioca starch wastewater by a novel combination of physical and biological processes. Water Sci Technol 1 September 2013; 68 (6): 1264–1270. doi: https://doi.org/10.2166/wst.2013.354
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