Acidogenic fermentation of food waste for volatile fatty acid production with co-generation of biohydrogen

Bio-electrocatalytic reduction of CO2: Enrichment of homoacetogens and pH optimization towards enhancement of carboxylic acids biosynthesis

“…Maximum fraction of C2 organic acids (acetic acid (AA): B: 1600 mg/l; C: 800 mg/l) followed by C3 (propionic acid (PA): B: 44 mg/l; C: 10 mg/l) and C4 (iso-butyric acid (BA): B: 15 mg/l; C: 8 mg/l) organic acids were observed. Alkaline pH (8.5-10) improves the acetic acid accumulation/production and its percentage in the total VFA than the corresponding carboxylic acids [39]. The organic acids formation observed through HPLC not only depicts the activity of the enriched homoacetogens, but also the activity of mixed culture which would have resulted in multicarboxylic acids synthesis utilizing the carbon source [16].…”

Deciphering acidogenic process towards biohydrogen, biohythane, and short chain fatty acids production: multi-output optimization strategy

“…Butyric acid fraction varied between 15.22 to 21.58%, while propionic acid fraction varied between 2.4 to 6.8%. The observed distribution of VFA composition can be explained by the adopted operating conditions (Eastman and Ferguson, 1981;Dahiya et al, 2015). In this study, since the experiments were maintained with the same kind of wastewater, the production: multi-output optimization strategy.…”

Applied potentials regulate recovery of residual hydrogen from acid-rich effluents: Influence of biocathodic buffer capacity over process performance

“…The liquid samples from anode and cathode chambers were analyzed for total chemical oxygen demand (COD) which were performed at the beginning and end of each batch cycle using standard methods (COD Reagent; HACH Company). Besides, total VFA formed in the anode chamber and total VFA consumed in the cathode chamber were analysed using methods described elsewhere (Dahiya et al, 2015). The buffering capacity (b, mmol/l) of anolyte and catholyte was estimated by pH based acid-base titration (0.1 N) with the fixed end points using an auto-titrator (Mettler Toledo DL50).…”