Treatment of Heavy Metals in a Constructed Wetland, Kaminokuni, Hokkaido-Accumulation of Heavy Metals in Emergent Vegetations-

Sasaki, Keiko; Ogino, Tagiru; Hori, Osamu; Takano, Keishi; Endo, Yuji; Sakurai, Yasushi; Irie, Kiyoshi

doi:10.2473/journalofmmij.125.453

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…Furthermore, cattails contributed to rhizofiltration by their elongated roots and bacterial metabolisms in the rhizosphere (Table 1, Figure 5). Many researchers have reported heavy metal retention in planted CWs as significantly higher than in unplanted CWs [9,14]. A soil layer that has accumulated heavy metals up to its adsorption capacity should be dredged for renewal of the metal-removing capability of the CW.…”

Section: Discussionmentioning

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: Discussionmentioning

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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Effects of Acid Soils on Plant Growth and Successful Revegetation in the Case of Mine Site

Matsumoto¹,

Shimada²,

Sasaoka³

et al. 2019

Soil pH for Nutrient Availability and Crop Performance

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Acid soils are caused by mining, potentially causing the death of plants. Although soil pH is one of the useful indicators to evaluate acid soil conditions for successful revegetation, the dissolution of harmful elements under acidic conditions should be considered in addition to the tolerance mechanism of plants in mines. Thus, this study aims to report the current situation of acid soils and plant growth in mine site and to elucidate the effects of acid soils on plant growth over time through field investigation and a vegetation test. The results showed that the dissolution of Al from acid soils which were attributed to the dissolution of sulfides influenced plant growth. Not only soil pH but also the assessment of the dissolution of sulfides over time is crucial for successful revegetation, suggesting that net acid producing potential (NAPP) and net acid generation (NAG) pH, which are used for evaluating the formation of acidic water, are useful to evaluate soil conditions for the revegetation. Furthermore, acid-tolerant plant survived under acidic conditions by increasing the resistance against acidic conditions with the plant growth. Such factors and the proper selection of plant species play an important role in achieving successful revegetation in mines.

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Treatment of Heavy Metals in a Constructed Wetland, Kaminokuni, Hokkaido-Accumulation of Heavy Metals in Emergent Vegetations-

Cited by 3 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—

Effects of Acid Soils on Plant Growth and Successful Revegetation in the Case of Mine Site

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