title: Study of the reuse of treated wastewater on waste container washing vehicles.
abstract: The wheelie bins for the collection of municipal solid waste (MSW) shall be periodically washed. This operation is usually carried out by specific vehicles which consume about 5000 L of water per day. Wastewater derived from bins washing is usually stored on the same vehicle and then discharged and treated in a municipal WWTP. This paper presents a study performed to evaluate the reuse of the wastewater collected from bins washing after it has been treated in a small plant mounted on the vehicle; the advantage of such a system would be the reduction of both vehicle dimension and water consumption. The main results obtained by coagulation-flocculation tests performed on two wastewater samples are presented. The addition of 2 mL/L of an aqueous solution of aluminum polychloride (18% w/w), about 35 mL/L of an aqueous solution of CaO (4% w/w) and 25 mL/L of an aqueous solution of an anionic polyelectrolyte (1 ‰ w/w) can significantly reduce turbidity and COD in treated water (to about 99% and 42%, respectively); the concomitant increase of UV transmittance at 254 nm (up to 15%) enables UV disinfection application by a series of two ordinary UV lamps. Much higher UV transmittance values (even higher than 80%) can be obtained by dosing powdered activated carbon, which also results in a greater removal of COD.
authors.affiliation: Department of Civil Engineering, Architecture, Land and Environment, University of Brescia, Via Branze 43, Brescia, Italy. mentore.vaccari@ing.unibs.it
authors.forename: Mentore
authors.initials: M
authors.lastname: Vaccari
authors.forename: Francesca
authors.initials: F
authors.lastname: Gialdini
authors.forename: Carlo
authors.initials: C
authors.lastname: Collivignarelli
mesh_terms: D011232:Chemical Precipitation; D004203:Disinfection; D005427:Flocculation; D010782:Photolysis; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D062065:Wastewater; D014874:Water Pollutants, Chemical