Treatment of Heavy Metals in a Constructed Wetland, Kaminokuni, Hokkaido-Role of Microorganisms in Immobilization of Heavy Metals in Wetland Soils-

Sasaki, Keiko; Hori, Osamu; Ogino, Tagiru; Takano, Keishi; Endo, Yuji; Tsunekawa, Masami; Hirajima, Tsuyoshi

doi:10.2473/journalofmmij.125.445

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…Wetland plant species show considerable variations in metal uptake and translocation abilities through phytoextraction [7][8][9][10]. Sulfate-reducing bacteria (SRB) in wetland soil decomposed organic matter to lower molecular weight acids and bicarbonate leading to increased alkalinity and formation of metal sulfide precipitates [11,12]. The bacteria-plant interaction is regarded as important because it implies symbiotic mechanisms for heavy metal removal and tolerance.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, at Motokura Mine in Hokkaido Prefecture, a CW was installed on a small scale in 2006 for removing zinc (Zn), lead (Pb), and arsenic (As). It has been scaled up for demonstration tests to replace existing neutralization processes [12,14]. A CW at Ningyotoge Mine is also used for As removal from acid mine drainage through ferrihydrite coprecipitation [15].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Cattails and Hydraulic Loading on Heavy Metal Removal from Closed Mine Drainage by Pilot-Scale Constructed Wetlands

Nguyen

Soda

Kanayama

et al. 2021

Water

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This study demonstrated heavy metal removal from neutral mine drainage of a closed mine in Kyoto prefecture in pilot-scale constructed wetlands (CWs). The CWs filled with loamy soil and limestone were unplanted or planted with cattails. The hydraulic retention time (HRT) in the CWs was shortened gradually from 3.8 days to 1.2 days during 3.5 months of operation. A short HRT of 1.2 days in the CWs was sufficient to achieve the effluent standard for Cd (0.03 mg/L). The unplanted and the cattail-planted CWs reduced the average concentrations of Cd from 0.031 to 0.01 and 0.005 mg/L, Zn from 0.52 to 0.14 and 0.08 mg/L, Cu from 0.07 to 0.04 and 0.03 mg/L, and As from 0.011 to 0.006 and 0.006 mg/L, respectively. Heavy metals were removed mainly by adsorption to the soil in both CWs. The biological concentration factors in cattails were over 2 for Cd, Zn, and Cu. The translocation factors of cattails for all metals were 0.5–0.81. Sulfate-reducing bacteria (SRB) belonging to Deltaproteobacteria were detected only from soil in the planted CW. Although cattails were a minor sink, the plants contributed to metal removal by rhizofiltration and incubation of SRB, possibly producing sulfide precipitates in the rhizosphere.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Cattails and Hydraulic Loading on Heavy Metal Removal from Closed Mine Drainage by Pilot-Scale Constructed Wetlands

Nguyen

Soda

Kanayama

et al. 2021

Water

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“…Emergent aquatic plants such as cattails and reeds are generally used in CWs for uptaking metals and for growing microorganisms in the rhizosphere. Reportedly, sulfate-reducing bacteria (SRB) in the soil decomposed organic matter and formed metal precipitates 9,10 . Nevertheless, the practice has not become widespread in Japan because the obtained knowledge is not always applicable to other cases.…”

Section: Introductionmentioning

confidence: 99%

A Laboratory Experiment System for Developing Mine Drainage Treatment Technologies Using Constructed Wetlands—Sequencing Batch Treatment of Cd-Containing Neutral Mine Drainage—

Soda

Sasaki

Nguyen

et al. 2021

RESOURCES PROCESSING

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A lab-scale experimental system accommodating soil and plants was designed to evaluate the applicability of constructed wetlands (CWs) to mine drainage treatment. Synthetic wastewater containing Cd (0.11 mg/L) and other minerals (pH 6.8) was prepared based on the chemical composition of an actual neutral mine drainage (NMD). In lab-scale CWs consisted of a column (ID 12.5 cm, H 50 cm) filled with pumice stones and loamy soil were planted reed (Reed-CW) or cattail (Cattail-CW) plants. Some were left unplanted (Unplanted CW). The synthetic NMD (2.0 L) was treated in a 1-week cycle sequencing batch mode in the CWs in a greenhouse. The unplanted CW removed cadmium sufficiently to satisfy the effluent standard (0.03 mg/L) from the NMD, mainly by soil adsorption. Presence of the emergent plants, especially cattail, enhanced metal removal possibly by filtration with their elongated roots and metal sulfide precipitation by sulfate-reducing bacteria in the rhizosphere of the Cattail-CW.

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Quantitative Modeling for Continuous Treatment of Zinc Contained Acid Mine Drainage Using Column Filling Leaf Mold

Kato

Ryo

Sato

et al. 2020

Journal of the Mining and Materials Processing Institute of Jap

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The objective of this study is to clarify the zinc removal mechanism and construct a quantitative model for column experiments using a natural component of organic soils, namely leaf mold. We performed column experiments using actual acid mine drainage (AMD) at several conditions. After column experiments, the residues in the column were analyzed by x-ray absorption fine structure (XAFS) analysis. These experimental results highlighted that when leaf mold, limestone, and iron powder were filled in the column, the zinc removal mechanism was not only surface complexation for leaf mold but also the formation of zinc sulfide. Whereas, when only leaf mold was filled in the column, that was only surface complexation for leaf mold. Based on the above results, we constructed a quantitative model incorporating surface complexation by leaf mold, sulfate reduction reaction by sulfate-reducing bacteria, Fe 2+ dissolved reaction from leaf mold, and one-dimensional transport against the height of the column. The experimental results of pH and the concentration of each element were successfully represented by the quantitative model.

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Treatment of Heavy Metals in a Constructed Wetland, Kaminokuni, Hokkaido-Role of Microorganisms in Immobilization of Heavy Metals in Wetland Soils-

Cited by 5 publications

References 13 publications

Effects of Cattails and Hydraulic Loading on Heavy Metal Removal from Closed Mine Drainage by Pilot-Scale Constructed Wetlands

Effects of Cattails and Hydraulic Loading on Heavy Metal Removal from Closed Mine Drainage by Pilot-Scale Constructed Wetlands

A Laboratory Experiment System for Developing Mine Drainage Treatment Technologies Using Constructed Wetlands—Sequencing Batch Treatment of Cd-Containing Neutral Mine Drainage—

Quantitative Modeling for Continuous Treatment of Zinc Contained Acid Mine Drainage Using Column Filling Leaf Mold

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