title: Bio-oil from thermo-chemical hydro-liquefaction of wet sewage sludge.
abstract: 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 H2 pressure (2.0-11.0MPa), residence time (10-100min) and type of catalysts (Na2CO3, Raney nickel, FeSO4, MoS2) 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 H2 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 (FeSO4) - 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.
authors.affiliation: Institute of Applied Chemistry, Riga Technical University, Paula Valdena Str. 3, LV-1048 Riga, Latvia. Electronic address: mkrist@inbox.lv.
authors.forename: Kristaps
authors.initials: K
authors.lastname: Malins
authors.affiliation: Institute of Applied Chemistry, Riga Technical University, Paula Valdena Str. 3, LV-1048 Riga, Latvia.
authors.forename: Valdis
authors.initials: V
authors.lastname: Kampars
authors.affiliation: Institute of Applied Chemistry, Riga Technical University, Paula Valdena Str. 3, LV-1048 Riga, Latvia.
authors.forename: Janis
authors.initials: J
authors.lastname: Brinks
authors.affiliation: Institute of Applied Chemistry, Riga Technical University, Paula Valdena Str. 3, LV-1048 Riga, Latvia.
authors.forename: Ilze
authors.initials: I
authors.lastname: Neibolte
authors.affiliation: Institute of Applied Chemistry, Riga Technical University, Paula Valdena Str. 3, LV-1048 Riga, Latvia.
authors.forename: Raimonds
authors.initials: R
authors.lastname: Murnieks
authors.affiliation: Institute of Applied Chemistry, Riga Technical University, Paula Valdena Str. 3, LV-1048 Riga, Latvia.
authors.forename: Ruta
authors.initials: R
authors.lastname: Kampare
mesh_terms: D056804:Biofuels; D005290:Ferric Compounds / Q000737:chemistry*; D006361:Heating / Q000379:methods*; D006868:Hydrolysis; D012722:Sewage / Q000737:chemistry*; D012996:Solutions; D014867:Water / Q000737:chemistry*; D017155:Wettability
chemical_list: D056804:Biofuels; D005290:Ferric Compounds; D012722:Sewage; D012996:Solutions; D014867:Water; C024823:ferric sulfate
keywords: Bio-oil; Sewage sludge; Thermo-chemical hydro-liquefaction; Transition metal catalysts