Influence of operation conditions on methane production from swine wastewater treated by a self-agitation anaerobic reactor

Faculty Agriculture Year: 2019
Type of Publication: ZU Hosted Pages:
Authors:
Ahmed Abdelmohsen Mahdi
Journal: Bioresource Technology Elsevier Volume:
Keywords : Influence , operation conditions , methane production from    
Abstract:
This study aimed to evaluate both the feasibility of using ambient temperatures (15, 20 and 25°C) in a selfagitated anaerobic baffled reactor (SaABR) fed with swine wastewater, and the impact of decreasing the hydraulic retention time (HRT) down to 3 days. The highest specific methane yield (0.61 ± 0.14L/gVSin) and organicsconversationefficiency(66%onTCODbasis)wereattainedbyelevatingtemperaturefrom15to25°C under an HRT of 10 days. Even though the highest volumetric methane yield (0.85 ± 0.17L/L/day) was registered during a 3-day HRT, the specific methane yield was lower as a result of volatile fatty acids accumulations(upto790 ± 39mg/L).ThedominantbacteriumwasClostridiumsensustrictowhileMethanosaetawas thedominantarchaeathroughoutalltheconditions,indicatingstrongacetoclasticmethanogenicactivityunder ambienttemperatures.TheseresultsdemonstratethatusingambienttemperaturesandshortHRTsisapromising strategy to successfully treat wastewater with decreasing energetics entries. This can, thereby, increase the treatmentcapacityandenhancethemethaneyieldduringtheanaerobicdigestionprocess.
    
     
 
       

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