Anaerobic digestion of alkaline bleaching wastewater from a Kraft pulp and paper mill using UASB technique
2015 (English)In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 36, no 12, 1489-1498 p.Article in journal (Refereed) Published
Anaerobic digestion of alkaline kraft elemental chlorine-free bleaching wastewater in two mesophilic, lab-scale upflow anaerobic sludge bed reactors resulted in significantly higher biogas production (250 ± 50 vs. 120 ± 30 NmL g [Formula: see text]) and reduction of filtered total organic carbon (fTOC) (60 ± 5 vs. 43 ± 6%) for wastewater from processing of hardwood (HW) compared with softwood (SW). In all cases, the gas production was likely underestimated due to poor gas separation in the reactors. Despite changes in wastewater characteristics, a stable anaerobic process was maintained with hydraulic retention times (HRTs) between 7 and 14 h. Lowering the HRT (from 13.5 to 8.5 h) did not significantly affect the process, and the stable performance at 8.5 h leaves room for further decreases in HRT. The results show that this type of wastewater is suitable for a full-scale implementation, but the difference in methane potential between SW and HW is important to consider both regarding process dimensioning and biogas yield optimization.
Place, publisher, year, edition, pages
Taylor & Francis: STM, Behavioural Science and Public Health Titles , 2015. Vol. 36, no 12, 1489-1498 p.
UASB; alkaline kraft ECF bleaching wastewater; anaerobic digestion; hardwood; softwood
IdentifiersURN: urn:nbn:se:liu:diva-114883DOI: 10.1080/09593330.2014.994042ISI: 000350448200002PubMedID: 25441833OAI: oai:DiVA.org:liu-114883DiVA: diva2:792880
FunderSwedish Energy Agency