Abstract
A pre-industrial scale experimentation aimed at the demonstration of a system for purification and reuse of wastewater from an industrial laundry was carried out by means of a prototype plant installed in situ, fed with 15 m3/h of untreated wastewater. The tested treatment system consisted of: (i) physico-chemical pre-treatment (coagulation, flocculation and Dissolved Air Flotation or DAF); (ii) sand filtration; (iii) ozonation; (iv) Granular Activated Carbon (GAC) filtration and (v) cross-flow ultrafiltration (UF) on flat membranes realised in polyvinyledene fluoride (PVDF). Under the optimised treatment conditions, it was demonstrated that the outlet of the GAC filter meets the requiring law limits for discharge to surface waters in Italy, even in terms of residual content of total surfactants (<2 mg/L). The post-treatment of ultrafiltration on flat membranes further reduced the residual pollutant content, allowing reuse of the treated effluents in some washing processes of home textiles, as demonstrated by whiteness index measurements. A cost analysis was performed to assess the operating costs of each treatment step.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.