Ozone as a selective disinfectant for nonaseptic fungal cultivation on corn-processing wastewater

Sindhuja Sankaran; Samir Kumar Khanal; Anthony L Pometto; J. (Hans) van Leeuwen

doi:10.1016/j.biortech.2008.03.055

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Ozone as a selective disinfectant for nonaseptic fungal cultivation on corn-processing wastewater

Journal article

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Ozone as a selective disinfectant for nonaseptic fungal cultivation on corn-processing wastewater

Sindhuja Sankaran, Samir Kumar Khanal, Anthony L Pometto and J. (Hans) van Leeuwen

Bioresource technology, Vol.99(17), pp.8265-8272

2008

DOI: https://doi.org/10.1016/j.biortech.2008.03.055

Handle:

https://hdl.handle.net/2376/107394

PMID: 18499449

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Abstract

Ozonation

Fungal biomass production

Fungal wastewater treatment

Selective disinfection

Corn wet-milling wastewater treatment

Treatment of wet corn-milling wastewater with filamentous fungi was investigated as a means of obtaining fungal biomass as an additional byproduct. Competitive bacterial growth is a common problem during this nonaseptic treatment process. Selective disinfection with ozone was evaluated for eliminating bacterial populations during fungal cultivation. Three laboratory-scale continuous flow aerated reactors were operated under nonaseptic conditions at 38 °C, hydraulic retention time of 8 h and pH of 4. The bacterial population was reduced by one log with respect to the control when ozone was dosed at a concentration above 47 ± 2 mg/L. An ozone dosage of about 57 mg/L was found to be most effective in improving both fungal biomass production and soluble chemical oxygen demand (SCOD) removal (up to 90%). Fungal biomass concentration increased from c. 1.45 g/L (control) to c. 1.75 g/L at a 57-mg/L ozone dosage. Higher and lower dosages of ozone resulted in poorer fungal growth and lower SCOD removal.

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Title: Ozone as a selective disinfectant for nonaseptic fungal cultivation on corn-processing wastewater
Creators: Sindhuja Sankaran - Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames, IA 50011, USA
Samir Kumar Khanal - Department of Molecular Biosciences and Bioengineering, University of Hawai’i at Mānoa, HI 96822, USA
Anthony L Pometto - Department of Food Science and Human Nutrition, Iowa State University, Ames, IA 50011, USA
J. (Hans) van Leeuwen - Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames, IA 50011, USA
Publication Details: Bioresource technology, Vol.99(17), pp.8265-8272
Academic Unit: Biological Systems Engineering, Department of
Publisher: Elsevier Ltd
Identifiers: 99900547007301842
Language: English
Resource Type: Journal article