Removal of inorganic mercury and methylmercury from surface waters following coagulation of dissolved organic matter with metal-based salts

Henneberry, Yumiko K.; Kraus, Tamara E.C.; Fleck, Jacob A.; Krabbenhoft, David P.; Bachand, Philip M.; Horwáth, William R.

doi:10.1016/j.scitotenv.2010.10.030

Cited by 109 publications

(45 citation statements)

References 46 publications

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“…The mineralization of dissolved organic carbon (DOC), the major component of DOM, is a source of CO 2 in the atmosphere Duarte et al, 2008;Spencer et al, 2009;Tranvik et al, 2009). DOC also serves to mediate the chemical environment through organic acids (Wetzel, 2001;Tranvik et al, 2009) and to enhance or alleviate the toxic forms of heavy metals (e.g., aluminum or mercury) (Cory et al, 2006;Henneberry et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal characterization of dissolved carbon for inland waters in semi-humid/semi-arid region, China

Song

Zang

Zhao

et al. 2013

Hydrol. Earth Syst. Sci.

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Abstract. Spatiotemporal variations of dissolved organic carbon (DOC) and inorganic carbon (DIC) in 26 waters across the semi-humid/semi-arid Songnen Plain, China, were examined with data collected during and brackish (n = 12) waters were grouped according to electrical conductivity (threshold = 1000 µS cm −1 ). Significant differences in the average DOC and DIC concentrations were observed between the fresh (5.63 mg L −1 , 37.39 mg L −1 ) and the brackish waters (15.33 mg L −1 , 142.93 mg L −1 ). Colored dissolved organic matter (CDOM) and DOC concentrations were mainly controlled by climatic-hydrologic conditions. The investigation indicated that the outflow conditions in the semi-arid region had condensed effects on the dissolved carbon, resulting in close relationships between salinity vs. DOC (R 2 = 0.66), and salinity vs. DIC (R 2 = 0.94). An independent data set collected in May 2012 also confirmed this finding (DOC: R 2 = 0.79, DIC: R 2 = 0.91), highlighting the potential of quantifying DOC and DIC via salinity measurements for waters dispersed in the plain. Indices based on the CDOM absorption spectra (e.g., the DOC-specific CDOM absorption (SUVA 254 ), absorption ratio a 250 : a 365 (E 250 : E 365 ) and the spectral slope ratio (Sr, S 275−295 /S 350−400 )) were applied to characterize CDOM composition and quality. Our results indicate that high molecular weight CDOM fractions are more abundant in the fresh waters than the brackish waters.

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Section: Introductionmentioning

confidence: 99%

Spatiotemporal characterization of dissolved carbon for inland waters in semi-humid/semi-arid region, China

Song

Zang

Zhao

et al. 2013

Hydrol. Earth Syst. Sci.

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“…Mercury pollution is a major, persistent problem these days and many conventional practices have been employed for its cleanup (Lone et al, 2008;Wang and Chen, 2009;Henneberry et al, 2011). However, the major challenges of these techniques are their costliness, release of harmful by-products, etc.…”

Section: Introductionmentioning

confidence: 99%

Mercury Pollution and Bioremediation—A Case Study on Biosorption by a Mercury-Resistant Marine Bacterium

Dash

Das

2014

Microbial Biodegradation and Bioremediation

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“…While the floc resulting from coagulation in water treatment is typically disposed of in landfills, there are cases where reservoirs or constructed wetlands are used as settling ponds to retain the residual floc (Bachand et al, 2000(Bachand et al, , 2006Downing et al, 2008). The use of on-site coagulation to remove DOM and improve agricultural drainage water quality is underway in the SacramentoSan Joaquin Delta (Mourad, 2003;Henneberry et al, 2011). Accumulation of the resulting floc in constructed wetlands is intended to help reverse land subsidence in the region.…”

Section: Introductionmentioning

confidence: 99%

Structural stability of coprecipitated natural organic matter and ferric iron under reducing conditions

Henneberry

Kraus

Nico

et al. 2012

Organic Geochemistry

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147

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a b s t r a c tThe objective was to assess the interaction of Fe coprecipitated with dissolved organic matter (DOM) and its effect on Fe (hydr)oxide crystallinity and DOM retention under abiotic reducing conditions. A Febased coagulant was reacted with DOM from an agricultural drain and the resulting precipitate (floc) was exposed to S(-II) and Fe(II). Solution concentrations of Fe(II/III) and DOM were monitored, floc crystallinity was determined using X-ray diffraction, and the composition and distribution of functional groups were assessed using scanning transmission X-ray microscopy (STXM) and near edge X-ray absorption fine structure (NEXAFS) spectroscopy. Results indicate coprecipitation of Fe(III) with DOM forms a non-crystalline floc that withstands crystallization regardless of change in pH, Fe:DOM ratio and type of reductant added. There was no evidence that exposure to reducing conditions led to release of DOM from the floc, indicating that coprecipitation with complex natural DOM in aquatic environments may stabilize Fe (hydr)oxides against crystallization upon reaction with reduced species and lead to long term sequestration of the DOM. STXM analysis identified spatially distinct regions with remarkable functional group purity, contrary to the model of DOM as a relatively uniform complex polymer lacking identifiable organic compounds. Polysaccharide-like OM was strongly and directly correlated with the presence of Fe but showed different Fe binding strength depending on the presence of carboxylic acid functional groups, whereas amide and aromatic functional groups were inversely correlated with Fe content.

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Removal of inorganic mercury and methylmercury from surface waters following coagulation of dissolved organic matter with metal-based salts

Cited by 109 publications

References 46 publications

Spatiotemporal characterization of dissolved carbon for inland waters in semi-humid/semi-arid region, China

Spatiotemporal characterization of dissolved carbon for inland waters in semi-humid/semi-arid region, China

Mercury Pollution and Bioremediation—A Case Study on Biosorption by a Mercury-Resistant Marine Bacterium

Structural stability of coprecipitated natural organic matter and ferric iron under reducing conditions

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