Integration of acidogenic and methanogenic processes for simultaneous production of biohydrogen and methane from wastewater treatment

Three-Stage Anaerobic Sequencing Batch Reactor (ASBR) for Maximum Methane Production: Effects of COD Loading Rate and Reactor Volumetric Ratio

“…Note that HLa was the most prevalent organic acid, in terms of concentration, in the studied range of the COD loading rate. The very high HLa concentrations in the first bioreactor of the studied three-stage ASBR were very different from those previously reported in single-and two-stage anaerobic systems, which, in contrast, showed very low concentrations of HLa [20,28,29]. The very high concentration range of HLa in the first bioreactor of the studied three-stage ASBR system resulted from the high COD loading rates, which were about three-and two-fold higher than those used in single-and two-stage high rate anaerobic systems, respectively.…”

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

“…H 2 and VFA are the two important value added products of acidogenic fermentation which if harvested properly in an integrated approach will make the whole process environmentally sustainable and economically viable. Acidogenic H 2 production was well studied and documented with various feedstock and at present it is at the stage of upscaling (Pasupuleti et al, 2014;Chandra and Venkata Mohan, 2014;Venkata Mohan et al, 2008). These short chain carboxylic acids can be utilized further as they are building blocks of various organic compounds including alcohols, aldehydes, ketones, esters, olefins, etc.…”

High rate biomethanation technology for solid waste management and rapid biogas production: An emphasis on reactor design parameters

“…Variation in the VFA concentrations in the outlet can be the function of the climatic temperature. If organic acids accumulate it means that the methanogenic population is insufficient to convert the available organic acids into methane, the pH drops, inhibiting methanogens, resulting in even lower methane production (Venkata Mohan et al, 2008). VFA concentration increased with time but inhibition was not observed in the present studied digester, stating that the digester functioned well at OLR of 1.5 kg/m 3 d À1 .…”