Bio-oil from Thermo-Chemical Hydro-Liquefaction of Wet Sewage Sludge
Bioresource Technology 2015
Kristaps Māliņs, Valdis Kampars, Jānis Brinks, Ilze Māliņa, Raimonds Mūrnieks, Rūta Kampare

The present work demonstrates the influence of experimental conditions such as weight ratio of sewage sludge to water (1/0-1/15), reaction temperature (200-350°C), initial H<inf>2</inf> pressure (2.0-11.0MPa), residence time (10-100min) and type of catalysts (Na<inf>2</inf>CO<inf>3</inf>, Raney nickel, FeSO<inf>4</inf>, MoS<inf>2</inf>) on hydro-liquefaction process of sewage sludge. High amount of water improves the hydro-liquefaction process of sewage sludge by increasing the yield of bio-oil and the total conversion. The highest yield of bio-oil (47.79 wt.%) from sewage sludge was obtained with initial H<inf>2</inf> pressure 5.0MPa, reaction temperature 300°C, and residence time 40min. Under these experimental conditions, using weight ratio of sewage sludge to water 1/5, catalyst (FeSO<inf>4</inf>) - 5 wt.% of dry SS, mixing speed 350rpm the obtained bio-oil had the highest energy recovery (69.84%), total conversion (70.64%) and its calorific value was 35.22MJ/kg.

Bio-oil | Sewage sludge | Thermo-chemical hydro-liquefaction | Transition metal catalysts

Māliņs, K., Kampars, V., Brinks, J., Māliņa, I., Mūrnieks, R., Kampare, R. Bio-oil from Thermo-Chemical Hydro-Liquefaction of Wet Sewage Sludge. Bioresource Technology, 2015, Vol.187, pp.23-29. ISSN 0960-8524. e-ISSN 1873-2976. Available from: doi:10.1016/j.biortech.2015.03.093

Publication language
English (en)
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