Chemical Transportation of Heavy Metals in the Constructed Wetland Impacted by Acid Drainage

Adsorption kinetics of Ni, Cr, and Pb on gravels collected from constructed wetland was studied at varied metal concentrations and contact period for estimating the removal of heavy metals from wastewater. Batch experiments were conducted by shaking 120 ml of metal solutions having 5 concentration levels each of Ni (1.0, 2.0, 3.5, 5.0 and 6.0 mg l-1), Cr (1.0, 2.0, 3.0, 4.5 and 6.0 mg l-1), and Pb (1.0, 3.0, 6.0, 8.0 and 12.0 mg l-1) with 50 g of gravels for as function of time. Adsorption of Ni, Cr, and Pb on gravels ranged from 34.8 to 47.2, 42.7-54.9, and 47.5-56.9%, indicating their removal in the order: Pb > Cr > Ni. Freundlich model showed a good fit for Ni and Cr (R2>0.9) while Langmuir model fitted better for Pb (R2= 0.7). The pseudo-second-order model showed the best fit to simulate the adsorption rates of these metals on gravel.

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

Journal of MMIJ ◽

10.2473/journalofmmij.125.453 ◽

2009 ◽

Vol 125 (8) ◽

pp. 453-460 ◽

Cited By ~ 1

Author(s):

Keiko SASAKI ◽

Tagiru OGINO ◽

Osamu HORI ◽

Keishi TAKANO ◽

Yuji ENDO ◽

...

Keyword(s):

Heavy Metals ◽

Constructed Wetland

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Evaluation of Retention Pond and Constructed Wetland BMPs for Treating Particulate-Bound Heavy Metals in Urban Stormwater Runoff

World Environmental and Water Resource Congress 2006 ◽

10.1061/40856(200)381 ◽

2006 ◽

Cited By ~ 3

Author(s):

Swarna Muthukrishnan ◽

Ariamalar Selvakumar

Keyword(s):

Heavy Metals ◽

Constructed Wetland ◽

Stormwater Runoff ◽

Urban Stormwater ◽

Retention Pond ◽

Urban Stormwater Runoff

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Simultaneous removal of heavy metals and bioelectricity generation in microbial fuel cell coupled with constructed wetland: an optimization study on substrate and plant types

Environmental Science and Pollution Research ◽

10.1007/s11356-021-15688-3 ◽

2021 ◽

Author(s):

Lu Wang ◽

Dayong Xu ◽

Qingyun Zhang ◽

Tingting Liu ◽

Zhengkai Tao

Keyword(s):

Heavy Metals ◽

Fuel Cell ◽

Microbial Fuel Cell ◽

Constructed Wetland ◽

Simultaneous Removal ◽

Bioelectricity Generation ◽

Optimization Study ◽

Removal Of Heavy Metals

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Distribution of heavy metals in various compartments of the constructed wetland system in Przywidz

Linnaeus Eco-Tech ◽

10.15626/eco-tech.1999.034 ◽

2019 ◽

pp. 297-305

Author(s):

Hanna Obarska-Pempkowiak ◽

Katarzyna Klimkowska

Keyword(s):

Heavy Metals ◽

Constructed Wetland ◽

Treatment Plant ◽

Domestic Sewage ◽

Point Of View ◽

Filling Material ◽

Toxic Heavy Metals ◽

Wetland System ◽

Cascade Filter ◽

The Hill

In the last decade constructed wetlands have become a very popular technology for removal of contaminants from domestic sewage. They are also assesed from the point of view of their capacity for removal of toxic heavy metals and organic substances resistant to degradation. Constructed wetland in Przywidz localized about 60 km from Gdansk is a pilot wastewater treatment plant (WWTP) designed for 150 PE (person equivalent). The system consists of two sections: vegetated submerged bed (VSB) with horizontal flow of sewage and a cascade filter situated on a slope of a hill. Domestic sewage after a conventional pretreatment ( consists of an Imhoff tank and a trickling filter) is pumped to the VSB filter located on slope of the hill. Total area of constructed wetland is about 870 m2. In the period 1995-98 the measurments of several heavy metals (Cd, Cu, Pb) were carried out. These measurments were carried out in inflowing and outflowing sewage and as well in samples collected from each section of constructed wetland system. In particular analysis of sediment collected in ditches of the cascade filter, filling material of the dykes, VSB filter and plants were carried out. It was found out that content of heavy metals in suspended soil decreased along the course of treatment, starting from VSB filter, through the first ditch to the last ditch. Measurable concentration of dissolved heavy metals were found in sewage collected from several subsequent ditches. The main mechanism of removal on particular matter in subsequent ditches was sorption.

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Simultaneous Removal of Heavy Metals And Bioelectricity Generation In Microbial Fuel Cell Coupled With Constructed Wetland: An Optimization Study On Substrate And Plant Types

10.21203/rs.3.rs-494707/v1 ◽

2021 ◽

Author(s):

Lu Wang ◽

Dayong Xu ◽

Qingyun Zhang ◽

Tingting Liu ◽

Zhengkai Tao

Keyword(s):

Heavy Metals ◽

Fuel Cell ◽

Microbial Fuel Cell ◽

Constructed Wetland ◽

Water Hyacinth ◽

Plant Roots ◽

Optimization Study ◽

Removal Of Heavy Metals ◽

Metal Treatment ◽

Optimal Construction

Abstract A microbial fuel cell coupled with constructed wetland (CW-MFC) was built to remove heavy metals (Zn and Ni) from sludge. The performance for the effects of substrates (granular activated carbon (GAC), ceramsite) and plants (Iris pseudacorus, Water hyacinth) towards the heavy metal treatment as well as electricity generation were systematically investigated. The CW-MFC systems possessed higher Zn and Ni removal efficiencies as compared to CW. The maximal removal rates of Zn (76.88%) and Ni (66.02%) were obtained in system CW-MFC based on GAC and Water hyacinth (GAC- and WH-CW-MFC). Correspondingly, the system produced the maximum voltage of 534.30 mV and power density of 70.86 mW·m-3, respectively. Plant roots and electrodes contributed supremely to the removal of heavy metals, especially for GAC- and WH-CW-MFC systems. The coincident enrichment rates of Zn and Ni reached 21.10% and 26.04% for plant roots, 14.48% and 16.50% for electrodes, respectively. A majority of the heavy metals on the sludge surface were confirmed as Zn and Ni. Furthermore, the high-valence Zn and Ni were effectively reduced to low-valence or elemental metals. This study provides a theoretical guidance for the optimal construction of CW-MFC and the resource utilization of sludge containing heavy metals.

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