Kinetic study of the methanogenic step of a two-stage anaerobic digestion process treating olive mill solid residue

Olive Oil Mill Waste Treatment:Improving the Sustainability of the Olive Oil Industry with Anaerobic Digestion Technology

“…After this initial acidification, the OLRs achieved in the methanogenic reactor were in the order of 22.0 g COD L -1 d -1 with COD and volatile solid removals of 94.3%-61.3% and 92.8%-56.1%, respectively, for OLRs between 0.8 and 20.0 g COD L -1 d -1 . Methane yields of 268 mL CH 4 g -1 COD removed were achieved (Rincón et al, 2009(Rincón et al, , 2010. Other studies in two-stages at thermophilic scale reported 2POMSW as an ideal substrate for biohydrogen and methane production.…”

Effect of pH, OLR, and HRT on performance of acidogenic and methanogenic reactors for treatment of biodiesel wastewater

“…(2014) [1][2][3][4][5][6][7][8][9][10][11] www.deswater.com doi: 10.1080/19443994.2014.909331 are subsequently converted to biogas (CH 4 and CO 2 ) by methane-forming bacteria in the second stage [6]. Therefore, the first stage may act as a metabolic buffer and prevent pH shock to the methanogenic population [8].…”

“…Therefore, the first stage may act as a metabolic buffer and prevent pH shock to the methanogenic population [8]. In general, acidogenic and methanogenic bacteria have different nutrient requirements and growth kinetics [11]. In two-stage system, the separation of optimization of the hydraulic retention time (HRT) and organic loading rate (OLR) for acidification and methanogenesis can be employed in each stage [12].…”

“…Biodiesel wastewater contains high amount of long-chain fatty acids (LCFA), which limit the efficiency of the biological wastewater treatment system [3,4]. A two-stage anaerobic digestion approach has previously been reported to improve the conversion of organic substance to methane [5][6][7][8][9][10][11][12]. Two separated reactors are required for the selection and enrichment of different micro-organisms.…”

Potential Applications of Green Technologies in Olive Oil Industry

“…Olive mill wastes can be treated with other methods such as composting to produce fertilizers (Ntoulas et al, 2011); using as a culture medium to produce useful microbial biomass (de la Fuente et al, 2011); using as a low-cost fermentation substrate for producing microbial biopolymers for production of polysaccharides and biodegradable plastics (Ntaikou et al, 2009); and as a base-stock for production of biofuels (Rincon et al, 2010).…”