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A Batch Reverse Osmosis Process to Recover and Recycle Trivalent Chromium from Electroplating Wastewater

  • Electroplating generates high volumes of rinse water that is contaminated with heavy metals. This study presents an approach for direct metal recovery and recycling from simulated rinse water, made up of an electroplating electrolyte used in industry, using reverse osmosis (RO). To simulate the real industrial application, the process was examined at various permeate fluxes, ranging from 3.75 to 30 L·m−2·h−1 and hydraulic pressures up to 80 bar. Although permeance decreased significantly with increasing water recovery, rejections of up to 93.8% for boric acid, >99.9% for chromium and 99.6% for sulfate were observed. The final RO retentate contained 8.40 g/L chromium and was directly used in Hull cell electroplating tests. It was possible to deposit cold-hued chromium layers under a wide range of relevant current densities, demonstrating the reusability of the concentrate of the rinsing water obtained by RO.
Author:Roxanne Engstler, Jan Reipert, Somayeh Karimi, Josipa Lisičar Vukušić, Felix Heinzler, Philip Davies, Mathias Ulbricht, Stéphan Barbe
Parent Title (English):Membranes
Editor:Davor Dolar
Document Type:Article
Date of first Publication:2022/08/31
Date of Publication (online):2022/11/08
GND-Keyword:Elektrophoretisches Beschichten; Umgekehrte Osmose
Tag:Closed-Loop; Electrolyte Recovery; Electroplating; Reverse Osmosis; Wastewater Treatment
Page Number:18
Institutes:Angewandte Naturwissenschaften (F11)
Dewey Decimal Classification:500 Naturwissenschaften und Mathematik
Open Access:Open Access
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International