title: Optimizing chemical conditioning for odour removal of undigested sewage sludge in drying processes.
abstract: Emission of odours during the thermal drying in sludge handling processes is one of the main sources of odour problems in wastewater treatment plants. The objective of this work was to assess the use of the response surface methodology as a technique to optimize the chemical conditioning process of undigested sewage sludges, in order to improve the dewaterability, and to reduce the odour emissions during the thermal drying of the sludge. Synergistic effects between inorganic conditioners (iron chloride and calcium oxide) were observed in terms of sulphur emissions and odour reduction. The developed quadratic models indicated that optimizing the conditioners dosage is possible to increase a 70% the dewaterability, reducing a 50% and 54% the emission of odour and volatile sulphur compounds respectively. The optimization of the conditioning process was validated experimentally.
authors.affiliation: LEQUIA, Institute of the Environment, University of Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain.
authors.forename: Esther
authors.initials: E
authors.lastname: Vega
authors.affiliation: LEQUIA, Institute of the Environment, University of Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain.
authors.forename: Hèctor
authors.initials: H
authors.lastname: Monclús
authors.affiliation: LEQUIA, Institute of the Environment, University of Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain; IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain.
authors.forename: Rafael
authors.initials: R
authors.lastname: Gonzalez-Olmos
authors.affiliation: LEQUIA, Institute of the Environment, University of Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain. Electronic address: maria.martin@udg.edu.
authors.forename: Maria J
authors.initials: MJ
authors.lastname: Martin
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry; D003890:Desiccation; D006801:Humans; D007501:Iron / Q000737:chemistry; D015233:Models, Statistical; D009812:Odorants / Q000032:analysis*; D010087:Oxides / Q000737:chemistry; D012722:Sewage / Q000737:chemistry*; D013457:Sulfur Compounds / Q000737:chemistry*; D018505:Waste Management / Q000379:methods*
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D012722:Sewage; D013457:Sulfur Compounds; C016538:lime; D007501:Iron
keywords: Dewaterability; Olfactometry; Response surface methodology; Sulphur compound; Undigested sewage sludge