Brewer’s spent grain (BSG) as the major byproduct in brewing industry is a promising feedstock to produce value-added products such volatile fatty acids (VFAs). Synergistic ball mill–enzymatic hydrolysis (BM-EH) process an environmentally friendly pretreatment method for lignocellulosic materials before bioprocessing. This study investigated potential of raw and BM-EH pretreated BSG feedstocks ...

The yeast Saccharomyces cerevisiae is a potential candidate for converting waste resources into food-grade single cell protein (SCP). Food fermentation broth rich in lactic acid was tested as an alternative substrate source S. this study. An electrodialysis (ED) system developed to recover lactate, acetate and ammonium ions (La-, Ac- NH4+) from the broth. First, we evaluated resilience under va...

BACKGROUND There is currently no widely accepted instrument for measuring preoperative anxiety. The objective of this study was to develop a simple visual facial anxiety scale (VFAS) for assessing acute preoperative anxiety. METHODS The initial VFAS was comprised of 11 similarly styled stick-figure reflecting different types of facial expressions (Fig 1). After obtaining IRB approval, a total...

key dissimilarities between thermophilic and mesophilic anaerobic digestion of waste activated sludge (was) were experimentally studied in this research. typical was with total solids (ts) concentrations of 30 and 60 g/l were digested anaerobically in a batch digester at mesophilic and thermophilic temperatures. solids reduction, total cod changes, the production of different volatile fatty ...

As a response to the environmental and societal issues that emanate from high reliance on fossil fuels, world is now transitioning toward circular bioeconomy. Acidogenic biohydrogen production envisaged as clean fuel of future due its non-polluting features affordability. The major encumbrance for industrialization this process accumulation metabolic inhibitors (volatile fatty acids (VFAs)), wh...

In recent years, much attention has been directed towards the integration of dark fermentation process into a biorefinery concept to enhance energetic gains, thereby improving competitiveness this process. The volatile fatty acids (VFAs) from fermentative H2-producing processes serve as precursors for microbial synthesis broad spectrum biotechnologically-important products such biofuels and bio...

The objective of the present study was to examine potential utilization yeast strain Pichia guilliermondii (Levica 27) on ruminal fermentation corn stover. Two in vitro treatments were evaluated: (A) filtered rumen liquid + powdered stover yeast-free culture medium and (B) inoculated with yeast. Samples collected at 0, 6, 12, 24 h examined for effects pH, ammonia nitrogen (NH3-N), fiber digesti...

The electrokinetic properties of the rumen microbiota are involved in cell surface adhesion and microbial metabolism. An in vitro study was carried out in batch culture to determine the effects of three levels of special surface area (SSA) of biomaterials and four levels of surface tension (ST) of culture medium on electrokinetic properties (Zeta potential, ξ; electrokinetic mobility, μe), ferm...

Most studies on the production of volatile fatty acids (VFAs) from waste activated sludge (WAS) digestion have focused on operating conditions, pretreatments and characteristic adjustments. Conditioning by extra carbon sources (ECS), normally added in a solid form, has been reported to be an efficient approach. However, this has caused considerable waste of monomeric sugars in the hydrolysate. ...

This study evaluated the impact of pig manure acidification on anaerobic treatment and composition of the fecal microbial community. According to the different chemical oxygen demand (COD) in the anaerobic treatment processes, pig manure was diluted 4 times (x4), 16 times (x16), or 64 times (x64) and subjected to acidification. During the acidification process, pH, soluble chemical oxygen deman...