6533b7d2fe1ef96bd125edc0

RESEARCH PRODUCT

Effect of additives on process stability of mesophilic anaerobic monodigestion of pig slaughterhouse waste

Saku LiuksiaOuti PakarinenAri VäisänenPrasad KaparajuJukka RintalaAki KorppooSuvi Bayr

subject

Environmental EngineeringHydraulic retention timeIronSus scrofata1172Continuous stirred-tank reactorBioengineeringMethanechemistry.chemical_compoundBioreactorsBiogasAnimalsAnaerobiosisWaste Management and Disposalta218Biological Oxygen Demand AnalysisWaste ProductsWaste managementRenewable Energy Sustainability and the EnvironmentTemperatureGeneral MedicineHydrogen-Ion ConcentrationFatty Acids VolatilePulp and paper industryAnaerobic digestionBiodegradation EnvironmentalchemistryBiofuelBiofuelsHydrochloric AcidMethaneAnaerobic exerciseAbattoirsBiotechnologyMesophile

description

The effect of two additives on anaerobic monodigestion of pig slaughterhouse waste was studied in three laboratory scale continuously stirred tank reactors (CSTRs) operated for 242-284 days at 35°C. A higher organic loading rate (OLR), namely 2.25 kg volatile solids (VS)/m(3)d with a hydraulic retention time (HRT) of 30 d was feasible with an additive containing Fe, HCl and trace elements while an OLR of 1.5 kg VS/m(3)d (HRT 30 d) led to instabilities in CSTR with an additive consisting of Fe and HCl and in CSTR without additives. Methane yields of ca. 700 dm(3) CH(4)/kg VS(fed) were obtained in all reactors under stable conditions. Both additives decreased H(2)S concentration of the biogas below detection limit 0.5 ppm while in a control reactor H(2)S concentration was up to 1900 ppm. In conclusion, the results suggest the possibility that additives may facilitate higher OLRs in monodigestion of pig slaughterhouse waste.

yearjournalcountryeditionlanguage
2012-09-01Bioresource Technology
10.1016/j.biortech.2012.06.009https://doi.org/10.1016/j.biortech.2012.06.009