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Water Practice & Technology © IWA Publishing 2006 |
doi10.2166/wpt.2006.069
Fungal treatment of corn processing wastewater in an attached growth system
Nagapadma Jasti1, Samir Kumar Khanal2, Anthony L. Pometto III3, J. (Hans) van Leeuwen4
1Department of Civil, Construction and Environmental Engineering, Iowa State University, 394 Town Engineering Building, Ames, IA 50011, USA
2Department of Civil, Construction and Environmental Engineering, Iowa State University, 354 Town Engineering Building, Ames, IA 50011, USA
3Department of Food Science and Human Nutrition, Iowa State University, 1581 Food Sciences Building, Ames, IA 50011, USA
4Department of Civil, Construction and Environmental Engineering, Iowa State University, 376 Town Engineering Building, Ames, IA 50011, USA
ABSTRACT
Corn processing wastewater was treated in an attached growth system of Rhizopus oligosporus fungi. The effects of hydraulic retention time (HRT) and plant-based components in the support media were evaluated in 1 L reactors under non-aseptic conditions. Plastic composite support (PCS) tubes, composed of 50% (w/w) polypropylene (PP) and 50% (w/w) agricultural products were used as support media or, as a test, PP only. A maximum chemical oxygen demand (COD) removal of 78% was achieved at a 5 h HRT with a biomass yield of 0.44 gVSS/gCODremoved. The biomass yield increased to 0.48 gVSS/gCODremoved while COD removal reduced to 70% at a 2.5 h HRT. Competitive bacterial growth was reduced at the shorter HRT. A lower HRT of 1.25 h led to biomass wash out from the reactor. Significantly lower COD removal of 28% and biomass yield of 0.19 gVSS/gCODremoved were observed in a biofilm reactor with PP tubes alone, indicating that the agricultural components in PCS media were essential for better biofilm formation and organic removal.
Keywords: Attached growth, corn processing wastewater; fungal treatment; plastic composite supports (PCS); Rhizopus oligosporus
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