Comparison of Organic Materials for the Passive Treatment of Synthetic Neutral Mine Drainage Contaminated by Nickel: Ads
- PDF / 539,716 Bytes
- 15 Pages / 547.087 x 737.008 pts Page_size
- 40 Downloads / 144 Views
Comparison of Organic Materials for the Passive Treatment of Synthetic Neutral Mine Drainage Contaminated by Nickel: Adsorption and Desorption Kinetics and Isotherms Dominique Richard & Alfonso Mucci & Carmen M. Neculita & Gérald J. Zagury Received: 30 April 2020 / Accepted: 3 November 2020 # Springer Nature Switzerland AG 2020
Abstract Sorption is an effective process for the remediation of mine water with low metal concentrations. To identify promising low-cost organic sorbents for nickel (Ni), adsorption and retention properties of peat, compost, brown algae, sawdust, and wood ash were compared. Batch adsorption and desorption experiments were conducted at pH 7 in 0.05 M NaNO3 solutions to simulate the ionic strength and pH of a contaminated neutral drainage. Results of adsorption kinetic experiments were best represented by the Elovich model and the fastest rates were obtained with peat (796,075 mg g−1 min−1) and compost (791 mg g−1 min−1). Results of equilibration adsorption experiments were fitted to Langmuir and Freundlich isotherms and the highest adsorption capacities were observed for peat (around 22 mg g−1) and compost (around 9 mg g−1). Desorption experiments revealed that peat and compost adsorbed more Ni and also released a lower percentage of the adsorbed metal upon exposure to Nifree solutions.
D. Richard : G. J. Zagury (*) Research Institute on Mines and Environment (RIME), Civil, Geological, and Mining Engineering Department, Polytechnique Montréal, Montreal, QC H3C 3A7, Canada e-mail: [email protected] A. Mucci GEOTOP and Department of Earth and Planetary Sciences, McGill University, 3450 University Street, Montreal, QC H3A 2A7, Canada C. M. Neculita RIME, University of Quebec in Abitibi-Temiscamingue (UQAT), 445 Boul. de l’Université, Rouyn-Noranda, QC J9X 5E4, Canada
Keywords Neutral mine drainage . Sorption . Adsorption . Desorption . Kinetics . Isotherms . Nickel . Organic materials
1 Introduction Sorption of metals onto organic materials is a rapid process that can be used in passive treatment systems to lower the metal concentrations of contaminated neutral drainage (CND) below regulatory threshold values (Calugaru et al. 2018). The financial cost of transporting these materials to remote mining sites can be substantial and, thus, studying the sorption capacity of locally available materials is of great interest. Over the past few years, the sorption of metals onto various natural materials and industrial waste products has been investigated, and numerous solid substrates with good sorption capacities have been identified (Das et al. 2008; Iakovleva and Sillanpaa 2013; Westholm et al. 2014; Zhou and Haynes 2010). Unfortunately, operational parameters such as pH, ionic strength, and sorbent:sorbate ratios vary greatly between different studies, making comparisons difficult. To establish a proper comparison, different solid substrates must be tested under identical experimental conditions. In this study, the sorption properties of five low-cost organic substrates were compared with
Data Loading...
