Volatile fatty acids (VFAs) are a group of carboxylic considered as building block chemicals. Nowadays, commercial production VFAs is performed using fossil fuel sources. As an alternative, acidogenic fermentation wastes by mixed microbial cultures (MMC) starting to be potential bioproduction process that would replace conventional processes and contribute the circular economy. Nevertheless, mo...

Essential oils from plants are volatile aromatic compounds, mainly terpenoids, phenylpropanoids; monoterpenes, sesquiterpenes, and alcohols, these present a wide range of antimicrobial antioxidant activity, so the addition essential clove, eucalyptus, mint, rosemary, oregano, cinnamon can modify ruminal fermentation by reducing population bacteria producing methane thus have reduction in produc...

A sequencing batch reactor (SBR) was operated to develop denitrifying bacteria that had a mean specific denitrification rate of 0.11 g NO3 -N/gVSS/day. Another system (an anaerobic digester) was operated to generate volatile fatty acids (VFAs) with the effluent concentration being measured to be 5655 ± 876 mg/L as acetic acid. Using the denitrifying biomass developed in the SBR and VFAs generat...

The IWA Anaerobic Digestion Modelling Task Group was established in 1997 at the 8th World Congress on Anaerobic Digestion (Sendai, Japan) with the goal of developing a generalised anaerobic digestion model. The structured model includes multiple steps describing biochemical as well as physicochemical processes. The biochemical steps include disintegration from homogeneous particulates to carboh...

Two expanded granular sludge-bed (EGSB) reactors (superficial velocity u s=6.0 and 9.0m/h) were used to treat an inhibitory substrate phenol. The granule diameter (dp) increased with increasing organic loading rate (OLR) and u(s). At the OLRs of 1.67-4.44 kg phenol/m3 d, the accumulation of volatile fatty acids (VFAs) was insignificant; whereas at the OLR of 5.11 kg phenol/m3 d, both the accumu...

Cow manure (CM) generation in large volumes has for long been considered a waste management challenge. However, the organic content of CM signals opportunities production value-added bioproducts such as volatile fatty acids (VFAs) through anaerobic digestion (AD). robust VFAs fermentation process requires effective methane formation inhibition and enhance recovery. In this study, thermal pretre...

Methane production from livestock farming is recognized as an important contributor to global GHGs. Volatile fatty acids (VFAs) found in bovine rumen may be utilized a substrate for methanogens form CH4, and thus improvement of quantitative VFA measurements can help facilitate greater understanding mitigation CH4 production. This study aims contribute the development more accurate methods quant...

Abbreviations: BOD: biochemical oxygen demand COD: chemical oxygen demand OD: optical density OW: optimized wastewater PNSB: purple non sulphur photosynthetic bacteria ROW:raw optimized wastewater RW: raw wastewater SCP: single cell protein SEM: scanning electron microscope SOW: sterile optimized wastewater SW: sterile wastewater TEM: transmission electron microscope TKN: total kjeldahl nitroge...

BACKGROUND As an efficient disposal method of food waste, anaerobic digestion (AD) for biogas production is widely used. In order to understand the enhanced efficiency and stability of AD by appropriate amounts of ammonia and volatile fatty acids (NH4 (+)/VFAs), the characteristics of the corresponding microbial community with ammonium acetate supplement were investigated by denatured gradient ...

This study evaluated feeding 0 and 40% wet distillers grains with solubles (WDGS) diets to cattle and the effects on feedlot manure collected from soil-based pens and incubated for 28 d. Steers (n = 603; 261 +/- 32 kg) were fed in eight pens (15 x 150 m) of 75 to 77 steers per pen. Two consecutive experiments were conducted with WDGS--one in which the corn source fed with WDGS was high-moisture...