Treatment of tapioca starch wastewater by a novel combination of physical and biological processes.
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.
University of Applied Sciences Ostwestfalen-Lippe, Campus Hoexter, D-37671 Hoexter, Germany E-mail: joachim.fettig@hs-owl.de.
J
J
Fettig
V
V
Pick
U
U
Austermann-Haun
M
M
Blumberg
N V
NV
Phuoc
D001419:Bacteria / Q000378:metabolism; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D003486:Cyanides / Q000378:metabolism; D005525:Food-Processing Industry; D007220:Industrial Waste; D002365:Manihot; D009584:Nitrogen / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism; D012722:Sewage; D013213:Starch; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000378:metabolism; D053833:Wetlands
D003486:Cyanides; D007220:Industrial Waste; D009584:Nitrogen; D010758:Phosphorus; D012722:Sewage; D013213:Starch; D062065:Wastewater; D014874:Water Pollutants, Chemical