Responses of an anaerobic fixed-film reactor to hydraulic shock loadings

Demand-driven biogas production in anaerobic filters

“…The methane concentrations of the produced biogas changed in response to the variations of the OLR in the study presented here and has been reported throughout the literature for shock loading (Kennedy and van den Berg, 1982;Chua et al, 1997;Masse and Masse, 2005;Senturk et al, 2013). In all cases the CO 2 concentration increased in response to increased OLR, with the CH 4 concentration reacting conversely.…”

“…The most reported response to shock loading is the decrease of degradation degree due to accumulation of VFAs and concomitant decrease in specic methane yield (Cohen et al, 1982;Grobicki and Stuckey, 1991;Borja and Banks, 1995;Chua et al, 1997;Angenent et al, 2002;Masse and Masse, 2005;. The accumulation is the consequence of kinetically saturated acetoclastic methanogenesis, the rate limiting step when liquid substrates are subjected to AD and thus controlling the maximum OLR that can be safely applied .…”

Fundamentals of the static granular bed reactor

“…After the shock load in the SGBR, the shorter HRT was maintained. Unlike shock studies with other systems (Chua et al, 1997;Nachaiyasit and Stukey, 1997;, COD and TSS removal in the SGBR remained high throughout the entire transition.…”

Microbial and operational response of an anaerobic fixed bed digester to oleic acid overloads

“…Removal efficiency, methane concentration in the biogas and pH decrease, whereas volatile fatty acids (VFA) accumulate in the effluent. Massive sloughing of biofilm from the support medium and washout of the biomass from the reactor are common under unfavourable conditions that cause inhibition to the microorganisms or excessive hydraulic shear to the biofilm [5,6]. A shock load of LCFA can make a reactor inactive for long periods [7].…”