Mercury sequestration and transformation in chemically enhanced treatment wetlands

Bachand, Philip A.M.; Kraus, Tamara E.C.; Stumpner, Elizabeth B.; Bachand, Sandra M.; Stern, Dylan; Liang, Yan Ling; Horwáth, William R.

doi:10.1016/j.chemosphere.2018.10.144

Cited by 10 publications

(5 citation statements)

References 80 publications

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“…DBPP load removals were an order of magnitude lower than DOC removal, with HAA precursors more effectively removed than THM precursors (Hansen et al 2018;Bachand et al 2019c). CETWs also consistently removed other WQCCs such as phosphate, DON, DFe, DAl, FTHg, and FMeHg at removal rates of 42% to 93% of source water loads (Stumpner et al 2015;Bachand et al 2019bBachand et al , 2019c.…”

Section: Summary Of Delta Cetw and Other Relevant Results Wqcc Removamentioning

confidence: 99%

“…We based coagulant costs per alternative on the use of PAC (Al treatment), because of its better DOC and DBPP removal and floc stability (Liang 2016;Bachand et al 2019c), as well as lower Hg content, as compared to ferric sulfate (Fe treatment) (Bachand et al 2019b). We estimated coagulant costs for two different DOC levels; high DOC (24 mg L -1 ) and low DOC (10 mg L -1 ), based on observed source water DOC concentrations that entered study control wetlands during fall/winter and summer/spring, respectively (Appendix A, Figure A6).…”

Section: Cost Results: Cost By Alternativementioning

confidence: 99%

“…In a related Delta study on the effects of mosquitofish that resided in CETWs and control wetlands, total Hg concentrations were found to be significantly lower (approximately 35%) in mosquitofish in the Fe CETWs compared to those residing in the control wetlands, while mosquitofish in Al CETWs had similar levels of total Hg compared to the control (Ackerman et al 2015). This may be related to the lower levels of methylmercury (from either suppressed production or additional sequestration) observed in the Fe treatment (Ackerman et al 2015;Bachand et al 2019b).…”

Section: Toxicity and Ecosystem Effectsmentioning

confidence: 94%

“…Two key design parameters are critical to CETW sizing: wetland HRT and flow rate. Study HRT was targeted at 4 days based upon the reported settling times required for key WQCC removal (Bachand et al 2000(Bachand et al , 2010a(Bachand et al , 2019b. Given that DOC removal targets were achieved in the study, this HRT was propagated into the design alternative assessment.…”

Section: Design and Costs Analysesmentioning

confidence: 99%

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Chemically Enhanced Treatment Wetland to Improve Water Quality and Mitigate Land Subsidence in the Sacramento‒San Joaquin Delta: Cost and Design Considerations

Bachand¹,

Kraus²,

Horwáth³

et al. 2019

SFEWS

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Water quality impairment and land surface subsidence threaten the viability of the Sacramento-San Joaquin Delta (Delta), a critical component of California's water conveyance system. Current-day irrigation drainage through Delta island peat soils affects drinking water treatment and is linked to mercury transport, potentially posing both ecological and public health concerns. To cost-effectively treat agricultural drainage water from subsided Delta islands to reduce the export of drinking Water Quality Constituents of Concern and mitigate land subsidence through accretion, we studied hybrid coagulation-treatment wetland systems, termed Chemically Enhanced Treatment Wetlands (CETWs). We provide cost estimates and design recommendations to aid broader implementation of this technology. Over a 20-year horizon using a Total Annualized Cost analysis, we

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Section: Summary Of Delta Cetw and Other Relevant Results Wqcc Removamentioning

confidence: 99%

Section: Cost Results: Cost By Alternativementioning

confidence: 99%

Section: Toxicity and Ecosystem Effectsmentioning

confidence: 94%

Section: Design and Costs Analysesmentioning

confidence: 99%

See 2 more Smart Citations

Chemically Enhanced Treatment Wetland to Improve Water Quality and Mitigate Land Subsidence in the Sacramento‒San Joaquin Delta: Cost and Design Considerations

Bachand¹,

Kraus²,

Horwáth³

et al. 2019

SFEWS

Self Cite

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“…One of the most important components of mercury in the global cycle is the various environmental behaviors of mercury in wetland ecosystems (Driscoll et al, 1994). As active reservoirs of mercury, wetland ecosystems are extremely important sources and sink areas for heavy metal mercury (Bachand et al, 2019). Natural wetlands play important roles in maintaining the health of ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Process of mercury accumulation in urban strip river artificial wetland ecosystems: a case study of Changchun, a typical industrial city in Northeast China

Zong,

Zhang,

et al. 2024

Front. Plant Sci.

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Mercury (Hg), as a global pollutant, is persistent, migratory, insidious, highly biotoxic and highly enriched, and is widely distributed in the atmosphere, hydrosphere, biosphere and lithosphere. Wetland ecosystems, as active mercury reservoirs, have become the most important sources and sinks of heavy metal mercury. Distinguished from natural wetlands, artificial wetlands located in urban sections of rivers face problems such as diverse urban pollution sources and complex spatial and temporal changes. Therefore, in this study, five intermittently distributed artificial wetlands were selected from the upstream to the downstream of the Changchun section of the Yitong River, a tributary of the Songhua River basin in the old industrial base of Northeast China. The mercury levels in the water bodies, sediments and plants of the artificial wetlands were collected and tested in four quarters from April 2023 to analyse the spatial and temporal distribution characteristics of total mercury. The results showed that the mercury levels in the water bodies, sediments and plants of the five wetlands showed a fluctuating trend with the river flow direction and had certain spatial and temporal distribution characteristics. This phenomenon was attributed to the sinking of external mercury pollution sources. In general, the wetland ecosystems showed a decreasing trend in the total Hg output of the downstream watershed. This may be due to the retention of particulate matter by aquatic plants in artificial wetlands to regular salvage of dead aquatic plants. At the same time urbanization and industrialization affect mercury levels in aquatic environments, so the risk of residential exposure needs to be looked at.

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The accumulation of metals and methylmercury in Nerita lineata and the relation to intertidal surface sediment concentrations

et al. 2020

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Mercury sequestration and transformation in chemically enhanced treatment wetlands

Cited by 10 publications

References 80 publications

Chemically Enhanced Treatment Wetland to Improve Water Quality and Mitigate Land Subsidence in the Sacramento‒San Joaquin Delta: Cost and Design Considerations

Chemically Enhanced Treatment Wetland to Improve Water Quality and Mitigate Land Subsidence in the Sacramento‒San Joaquin Delta: Cost and Design Considerations

Process of mercury accumulation in urban strip river artificial wetland ecosystems: a case study of Changchun, a typical industrial city in Northeast China

The accumulation of metals and methylmercury in Nerita lineata and the relation to intertidal surface sediment concentrations

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