The Diverse Response on Degradation Rate of Different Substrates Upon Addition of Zeolites
2010 (English)In: 3rd International Symposium on Energy from Biomass and Waste. Venice, Italy, Nov 8-11, 2010., 2010Conference paper (Refereed)
SUMMARY: This study evaluates the effects of addition of the natural zeolite clinoptilolite to anaerobic digesters treating different materials in both batch and continuous lab-scale setups. Zeolite addition to a CSTR with high ammonium levels (5 g NH4+/L) was performed with the purpose to investigate the effects on the amount of free ammonium. We also investigated non ammonium related effects of zeolite addition in dosage between 0-10 g zeolite/L to distinguish any beneficial properties effects. The concentration that was found to be most suitable for slaughterhouse waste (5 g zeolite/L) was subsequently tested and compared in batch conditions for slaughterhouse waste, thin stillage from ethanol production and sewage sludge. Batch experiments with slaughterhouse waste with 5 g zeolite/L significantly decreased the lag phase and in effect increased the degradation rate; no similar effect could be identified for the other substrates tested. We suggest that the increase of degradation rate when adding zeolites in low concentrations is unrelated to the ammonium reduction caused by the zeolite.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:liu:diva-74083OAI: oai:DiVA.org:liu-74083DiVA: diva2:480043