title: Bioaugmentation of potent acidogenic isolates: a strategy for enhancing biohydrogen production at elevated organic load.
abstract: The efficiency of bioaugmentation strategy for enhancing biohydrogenesis at elevated organic load was successfully evaluated by augmenting native acidogenic microflora with three acidogenic bacterial isolates viz., Bacillus subtilis, Pseudomonas stutzeri and Lysinibacillus fusiformis related to phyla Firmicutes and Proteobacteria separately. Hydrogen production ceased at 50g COD/l operation due to feed-back inhibition. B. subtilis augmented system showed higher H2 production followed by L. fusiformis, P. stutzeri and control operations, indicating the efficacy of Firmicutes as bioaugmentation biocatalyst. Higher VFA production with acetic acid as a major fraction was specifically observed with B. subtilis augmented system. Shift in metabolic pathway towards acidogenesis favoured higher H2 production. FISH analysis confirmed survivability and persistence of augmented strains apart from improvement in process performance. Bio-electrochemical analysis depicted specific changes in the metabolic activity after augmentation which also facilitated enhanced electron transfer. P. stutzeri augmented system documented relatively higher COD removal.
authors.affiliation: Bioengineering and Environmental Centre (BEEC), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India.
authors.forename: R Kannaiah
authors.initials: RK
authors.lastname: Goud
authors.affiliation: Bioengineering and Environmental Centre (BEEC), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India.
authors.forename: Omprakash
authors.initials: O
authors.lastname: Sarkar
authors.affiliation: Bioengineering and Environmental Centre (BEEC), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India.
authors.forename: P
authors.initials: P
authors.lastname: Chiranjeevi
authors.affiliation: Bioengineering and Environmental Centre (BEEC), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India. Electronic address: vmohan_s@yahoo.com.
authors.forename: S
authors.initials: S
authors.lastname: Venkata Mohan
mesh_terms: D000143:Acids / Q000378:metabolism*; D001419:Bacteria / Q000187:drug effects / Q000254:growth & development / Q000302:isolation & purification* / Q000378:metabolism*; D001673:Biodegradation, Environmental / Q000187:drug effects; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D001709:Biotechnology / Q000379:methods*; D015169:Colony Count, Microbial; D055664:Electrochemical Techniques; D005232:Fatty Acids, Volatile / Q000032:analysis; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D017404:In Situ Hybridization, Fluorescence; D009930:Organic Chemicals / Q000494:pharmacology*; D010088:Oxidoreductases / Q000378:metabolism
chemical_list: D000143:Acids; D056804:Biofuels; D005232:Fatty Acids, Volatile; D009930:Organic Chemicals; D006859:Hydrogen; D010088:Oxidoreductases
keywords: Anaerobic sequencing batch reactor (AnSBR); Dehydrogenase activity; FISH; Volatile fatty acids; Wastewater treatment