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Title: A low-input strategy for chromium removal from industrial stormwater using peat sorbent

Journal Article · · Journal of Environmental Quality
DOI: https://doi.org/10.1002/jeq2.20397 · OSTI ID:1889166

Low-cost and low-input water treatment systems are important for industrial stormwater remediation. Here we examine a flow-through reactor treatment installation where water exceeds the allowable maximum concentration for drinking water in multiple metals (e.g., chromium [Cr], cadmium [Cd], zinc [Zn]) prior to treatment. Specifically, we seek to understand why Cr attenuated in the reactors is not leachable by identifying the specific chemical form of Cr and dominant mechanisms promoting sequestration in the reactors. Total solid-phase Cr concentration in the peat media ranged from 50 to 150 mg/kg after 1 yr of exposure to stormwater to 300 to 900 mg/kg after 3.5 yr. X-ray fluorescence mapping images show Cr, iron (Fe), and Zn spatially correlated over a scale of 10 μm to 5 mm. Chromium rinds form on the edges of peat particles as Cr accumulates. Chromium and Fe K-edge X-ray absorption near edge structure spectroscopy reveal chromium predominately in the 3+ oxidation state with lesser amounts of elemental Cr. We propose the primary means of chromium attenuation in the reactors is precipitation as Cr-Fe hydroxides combined with trivalent Cr adsorption onto peat surfaces.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515; SC0012704
OSTI ID:
1889166
Report Number(s):
BNL-223417-2022-JAAM
Journal Information:
Journal of Environmental Quality, Journal Name: Journal of Environmental Quality Journal Issue: 5 Vol. 51; ISSN 0047-2425
Publisher:
American Society of Agronomy, Crop Science Society of America, and Soil Science Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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