Arsenic retention on technosols prepared with nanoparticles for treatment of mine drainage water

Bolaños, Daniel Chavarría; Sánchez, Virtudes; Paz, J.S. De La; Balseiro, M.; Cumbal, Luis

doi:10.1201/9781351046633-183

Cited by 1 publication

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In response to the encountered mining pollution problems, this current study proposes the use of Technosol combined with nanoparticles in order to recover polluted soil and water [9][10][11]. In previous studies, the uptake of heavy metals by Technosols prepared in Ecuador has been evaluated mainly at the laboratory level [12][13][14][15]. Moreover, iron-based nanoparticles prepared by green or conventional synthesis have been used to remove toxic metals from polluted water and soils under laboratory experimental conditions, such as the multicomponent nanoparticles biosynthesized with orange peel (Citrus sinensis) extract [16].…”

Section: Introductionmentioning

confidence: 99%

“…This chemical composition gives the nanoparticles enhanced sorption properties to selectively capture heavy metals. Particularly, the active groups of the zero-valent iron and ferrous sulfide chemically retain arsenic through the formation of Fe-oxide-As 3+ complexes, complexation with iron hydroxides, reduction to As 0 or As 3+ in the presence of Fe 0 [17] and surface complexation by FeS [18] The capability of nanoparticles to immobilize heavy metals dissolved in water was over 80%, reaching even 99% for arsenic, allowing the design and elaboration of Technosol mixed with nanoparticles [13,14]. A silty clay extracted from a mining area was used as Technosol.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design and Construction of a Prototype for Arsenic Retention in Mining-Contaminated Waters by Application of Nanoparticles-Based Technosols

et al. 2023

View full text Add to dashboard Cite

A large number of heavy metals are usually contained in mine-derived liquids, which could cause contamination of surrounding water sources. Due to the detrimental effects on the environment and health, conventional treatments have been employed to capture heavy metals in mining-polluted streams. This study shows the results of the operation of a built prototype for the retention of arsenic contained in waters contaminated by mining activities using Technosols (mixtures of local soil with nanoparticles). Our team previously run laboratory tests using fixed-bed columns to find out the best dose of the Technosol (97% soil + 3% nanoparticles). Based on these results, the sizing and building of a scale model were conducted, which in turn was used to evaluate the performance of the treatment in a concrete channel packed with reactive barriers. Variations in water volume, barrier separation and gate opening were tested to analyze the behavior of the proposed system and to obtain the most optimal hydraulic retention time that allowed the prototype to reach an arsenic retention level of a minimum of 70%. Moreover, to analyze the procedure under conditions of high arsenic contamination, samples of mine tailings were enriched with the toxic metalloid. It was found that the content of Fe in the local soil allowed adsorption of the contaminant, which was subsequently compared with the increase in the uptake of As due to the Fe/FeS multicomponent nanoparticles (NPs), dosed in the Technosol in a proportion of 97% soil + 3% NPs. The best treatment achieved 70.5% of As removal in ten cycles with a volume of 44 L. Tests were run at a maximum input flow rate of 43.8 L·min−1, an output flow rate of 13.2 L·min−1, a speed of 6.0 m·min−1 and a hydraulic retention time of 3.4 min per cycle. Results of arsenic retention using this prototype suggest that this simple and inexpensive technological setup could be scaled up to a functional field application to effectively capture the toxic metalloid.

show abstract