Treatment of tapioca starch wastewater by a novel combination of physical and biological processes
A pilot plant combining dissolved airflotation, anaerobic degradation in an expanded granular sludge
bed (EGSB) reactor and aerobic post-treatment in a verticalflow 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.
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