title: Use of laboratory anaerobic digesters to simulate the increase of treatment rate in full-scale high nitrogen content sewage sludge and co-digestion biogas plants.
abstract: The aim of this study was to assess the effect of increasing feedstock treatment rate on the performance of full-scale anaerobic digestion using laboratory-scale reactors with digestate and feedstock from full-scale digesters. The studied nitrogen-containing feedstocks were i) a mixture of industrial by-products and pig slurry, and ii) municipal sewage sludge, which digestion was studied at 41 and 52°C, respectively. This study showed the successful reduction of hydraulic retention times from 25 and 20days to around 15days, which increased organic loading rates from 2 to 3.5kg volatile solids (VS)/m(3)d and 4 to 6kgVS/m(3)d. As a result, the optimum retention time in terms of methane production and VS removal was 10-15% lower than the initial in the full-scale digesters. Accumulation of acids during start-up of the co-digestion reactor was suggested to be connected to the high ammonium nitrogen concentration and intermediate temperature of 41°C.
authors: Natural Resources Institute Finland (Luke), Bio-based Business and Industry, Tietotie 2 C, FI-31600 Jokioinen, Finland. Electronic address: elina.tampio@luke.fi.
authors: Elina
authors: E
authors: Tampio
authors: Natural Resources Institute Finland (Luke), Bio-based Business and Industry, Tietotie 2 C, FI-31600 Jokioinen, Finland.
authors: Satu
authors: S
authors: Ervasti
authors: Gasum Biovakka Ltd., Autokatu 8, FI-20380 Turku, Finland.
authors: Teija
authors: T
authors: Paavola
authors: Tampere University of Technology, Department of Chemistry and Bioengineering, P.O. Box 541, FI-33101 Tampere, Finland.
authors: Jukka
authors: J
authors: Rintala
mesh_terms: D000818:Animals; D056804:Biofuels / Q000032:analysis; D019149:Bioreactors; D008372:Manure; D008697:Methane / Q000096:biosynthesis; D009584:Nitrogen / Q000378:metabolism; D012722:Sewage / Q000737:chemistry; D013552:Swine; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*
chemical_list: D056804:Biofuels; D008372:Manure; D012722:Sewage; D009584:Nitrogen; D008697:Methane
keywords: Anaerobic digestion; Co-digestion; Hydraulic retention time; Nitrogen; Sewage sludge