Sustainable approach on removal of toxic metals from electroplating industrial wastewater using dissolved air flotation. (1st October 2021)

• Record Type: Journal Article
• Authors: Pooja, G.; Kumar, P. Senthil; Prasannamedha, G.; Varjani, Sunita; Vo, Dai-Viet N.
• Is Part Of: Journal of environmental management. Volume 295(2021)
• Publication Date: 2021-10-01
• Subjects: Electroplating wastewater -- Dissolved air flotation -- Toxic metals -- Anionic surfactant -- Energy system; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2021.113147
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: This research paper concentrates on the removal of heavy metal from wastewater which was produced from an electroplating industry. Here, the Dissolved Air Flotation (DAF) treatment process is carried out to remove toxic metals such as chromium, cadmium, nickel, lead, and copper using Sodium Dodecyl Sulfate (SDS) as a collector. The best-optimized conditions for the maximum removal of all the metal ions about 97.39% was achieved at pH 8, contact time of 60 min, surfactant dosage of 0.2 g, and the pressure of 137.89 kPa. At optimized conditions, the treated water consists of 2.71 mg/L of chromium, 1.13 mg/L of cadmium, 10.24 mg/L of nickel, 0.06 mg/L of lead, and 1.14 mg/L of copper. The used surfactant SDS was found as an environmentally friendly compound as prescribed by the Environmental Protection Agency. It is inferred that the flotation kinetics that manifests the rate of recovery and time for all the metal ions follow first-order kinetics. Further, the removal rate constant (k) increases with decreasing the initial metal ion concentration. Overall, the result of this work propounds that the DAF process plays as a promising technique to eliminate noxious pollutants from the wastewater. Graphical abstract: Image 1 Highlights: Removal of heavy metals from Electroplating industrial wastewater was carried out using dissolved air flotation. Sodium Dodecyl Sulfate was used as a surfactant. Flotation kinetics establishing the relationship between time and concentration. Pollutants removal relies on the formation of bubbles and proper collector used. Scale-up of the system for industrial wastewater treatment is advisable as they act as a promising technology.