title: Performance evaluation of anaerobic hybrid reactors with different packing media for treating wastewater of mild alkali treated rice straw in ethanol fermentation process.
abstract: Four anaerobic hybrid reactors with different packing media viz. gravel (R1), pumice stone (R2), polypropylene saddles (R3) and ceramic saddles (R4) were operated in semi-continuous mode. Biomethanation potential of the wastewater generated during alkali-treatment of rice straw in ethanol production process was investigated at ambient conditions. The reactors were operated with varying organic loading rates (0.861-4.313 g COD l(-1) d(-1)) and hydraulic retention time (3-15 days). Higher COD removal efficiency (69.2%) and methane yield (0.153 l CH4 g(-1) CODadded) were achieved in reactor R2 at 15 days HRT. Modified Stover-Kincannon model was applied to estimate the bio-kinetic coefficients and fitness of the model was checked by the regression coefficient for all the reactors. The model showed an excellent correlation between the experimental and predicted values. The present study demonstrated the treatment of wastewater from alkali treated rice straw for production of biogas.
authors.affiliation: Sardar Patel Renewable Energy Research Institute, P. Box No. 2, Vallabh Vidyanagar, 388 120 Gujarat, India. Electronic address: madhuri68@gmail.com.
authors.forename: Madhuri
authors.initials: M
authors.lastname: Narra
authors.affiliation: Sardar Patel Renewable Energy Research Institute, P. Box No. 2, Vallabh Vidyanagar, 388 120 Gujarat, India.
authors.forename: Velmurugan
authors.initials: V
authors.lastname: Balasubramanian
authors.affiliation: Sardar Patel Renewable Energy Research Institute, P. Box No. 2, Vallabh Vidyanagar, 388 120 Gujarat, India.
authors.forename: Himali
authors.initials: H
authors.lastname: Mehta
authors.affiliation: Sardar Patel Renewable Energy Research Institute, P. Box No. 2, Vallabh Vidyanagar, 388 120 Gujarat, India.
authors.forename: Garima
authors.initials: G
authors.lastname: Dixit
authors.affiliation: BRD School of Biosciences, Sardar Patel Maidan, Satellite Campus, Sardar Patel University, P. Box No. 39, Vallabh Vidyanagar, 388 120 Gujarat, India.
authors.forename: Datta
authors.initials: D
authors.lastname: Madamwar
authors.affiliation: BRD School of Biosciences, Sardar Patel Maidan, Satellite Campus, Sardar Patel University, P. Box No. 39, Vallabh Vidyanagar, 388 120 Gujarat, India. Electronic address: arshah02@yahoo.com.
authors.forename: Amita R
authors.initials: AR
authors.lastname: Shah
mesh_terms: D000693:Anaerobiosis / Q000187:drug effects; D001673:Biodegradation, Environmental / Q000187:drug effects; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002516:Ceramics / Q000737:chemistry; D000431:Ethanol / Q000378:metabolism*; D005232:Fatty Acids, Volatile / Q000032:analysis; D005285:Fermentation / Q000187:drug effects*; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D007700:Kinetics; D008697:Methane / Q000032:analysis; D008962:Models, Theoretical; D012275:Oryza / Q000187:drug effects*; D011126:Polypropylenes / Q000737:chemistry; D012972:Sodium Hydroxide / Q000494:pharmacology*; D013997:Time Factors; D014865:Waste Disposal, Fluid; D014866:Waste Products; D062065:Wastewater / Q000382:microbiology*; D018508:Water Purification / Q000295:instrumentation*
chemical_list: D056804:Biofuels; D000431:Ethanol; D005232:Fatty Acids, Volatile; D008697:Methane; D011126:Polypropylenes; D012972:Sodium Hydroxide; D014866:Waste Products; D062065:Wastewater
keywords: Anaerobic hybrid reactor; Biomethanation; Hydraulic retention time; Packing media; Removal efficiency