Fate and distribution of arsenic in laboratory-scale subsurface horizontal-flow constructed wetlands treating an artificial wastewater

Rahman, Khaja Zillur; Wießner, Arndt; Kuschk, Peter; Afferden, Manfred van; Mattusch, Jürgen; Müller, Roland

doi:10.1016/j.ecoleng.2011.02.016

Cited by 32 publications

(20 citation statements)

References 39 publications

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“…These values could be associated with the presence of organic matter from the roots of Lavandula sp. that could modify the chemical characteristics of the water in the microcosms or probably by oxidation of sulfur [52]. In general, values close to neutral were found during the 270 days of operation.…”

Section: Flower Productionmentioning

confidence: 83%

Effects of the Use of Ornamental Plants and Different Substrates in the Removal of Wastewater Pollutants through Microcosms of Constructed Wetlands

et al. 2018

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Abstract:The high costs involved in treating wastewater are problems that developing countries confront, mainly in rural areas. Therefore, Constructed Wetlands (CWs), which are composed of substrate, vegetation, and microorganisms, are an economically and ecologically viable option for wastewater treatment in these places. There is a wide variety of possibilities for substrates and ornamental plants that have not yet been evaluated to be implemented in future CW designs. The goal of this study was to evaluate the process of adaptation and removal of wastewater pollutants in CW microcosms using different terrestrial ornamental plants (Lavandula sp., Spathiphyllum wallisii, and Zantedeschia aethiopica). Those plants were sown in two types of substrate: red volcanic gravel (RVG) and polyethylene terephthalate (PET). CWs with vegetation reduced 5-day biochemical oxygen demand (BOD 5 ) by 68% with RVG substrate and 63% with PET substrate, nitrates 50% in RVG substrate and 35% in PET substrate, phosphates 38% in RVG substrate and 35% in PET substrate, and fecal coliforms 64% in RVG and 59% in PET substrate). In control microcosms without vegetation, reductions were significantly lower than those in the presence of plants, with reduction of BOD 5 by 61% in RVG substrate and 55% in PET substrate, nitrates 26% in RVG substrate and 22% in PET substrate, phosphates 27% in RVG substrate and 25% in PET substrate. Concerning fecal coliforms 62% were removed in RVG substrate and 59% in PET substrate. Regarding the production of flowers, Lavandula sp. did not manage to adapt and died 45 days after sowing and did not produce flowers. Spathiphyllum wallisii produced 12 flowers in RVG and nine flowers in PET, while Zantedeschia aethiopica produced 10 in RVG and 7 in PET. These results showed that the use of substrates made of RVG and PET is a viable alternative to be implemented in CWs. In addition, the reuse of PET is an option that decreases pollution by garbage. The plants Spathiphyllum wallisii and Zantedeschia aethiopica remarkably contribute in the removal of pollutants in wastewater. Additionally, the use of ornamental plants, with commercial interest such as those evaluated, enables an added value to the CW to be given, which can be used for flower production purposes on a larger scale and favor its acceptance within rural communities.

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Section: Flower Productionmentioning

confidence: 83%

Effects of the Use of Ornamental Plants and Different Substrates in the Removal of Wastewater Pollutants through Microcosms of Constructed Wetlands

et al. 2018

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“…It was considered that higher adsorption conditions between organic matter and arsenic were provided during the system's Eh decrease , since As 5+ can function as an electron receptor, being reduced to As 3+ and immobilized by the particulate organic matter .…”

Section: Resultsmentioning

confidence: 99%

“…pH values were lower than 8, indicating that H

{AsO}_{4}^{2 -}

was the arsenic main specie. Under this circumstances it was assumed that arsenic retained on HA and HB mesocosm, was owed to Fe and Mn oxides precipitation/absorption, which is also due to the fact that in an oxygenated media, arsenic can be retained by precipitation/absorption of Fe 3+ and Mn 5+ oxyhidroxides (at pH ≥ 6.5 and Eh > 0), since Eh increment enhance the oxides arsenic affinity .…”

Section: Resultsmentioning

confidence: 99%

“…Sulfate reducing bacteria (SRB) are organisms that utilize sulfate as a terminal electron acceptor in the anaerobic oxidation of organic substrates . SRB reduce As 5+ and sulfate, resulting in the precipitation of As 2 S 3 .…”

Section: Introductionmentioning

confidence: 99%

“…Oxygen availability is affected by system operation mode: in wastewaters, batch feeding favors aerobic processes; whereas continuous feeding favors anaerobic processes . Vegetation also plays an important role due to oxygen transference into the rhizosphere and subsequently to plant culture bed .…”

Section: Introductionmentioning

confidence: 99%

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Redox potential and pH behavior effect on arsenic removal from water in a constructed wetland mesocosm

Valles-Aragón

Olmos-Márquez

Llorens

et al. 2013

Env Prog and Sustain Energy

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Arsenic retention in constructed wetlands is highly influenced by environmental conditions, physicochemical and biological interactions, particularly in the rhizosphere (pH, redox potential, and temperature). The present research investigated the effects of redox potential and pH behavior on arsenic retention in the constructed wetland mesocosm. The study was conducted in three prototypes. Two planted (HA and HB) with Eleocharis macrostachya and Schoenoplectus americanus, respectively; a third one (HC) remained unplanted as control. The system was in continuous operation during 343 days, fed by groundwater with arsenic concentration at 90.66 ± 14.95 µg L−1, and a hydraulic retention time of 2 days. Monitored parameters were: redox potential, pH, dissolved oxygen, water and environmental temperature, arsenic concentration inlet and outlet. Oxidizing conditions (87–516 mV) were reported during most of the hot and warm season (84–90%); while reducing conditions (up to −539 mV) where reported the rest of the time. On cold season, only oxidizing conditions were detected. A pH from 7.0 to 8.0 was preserved for HA and HB, whereas HC preserved higher pH values (8.0 to 8.5). HA and HB behavior was observed similar among them, reporting higher arsenic retention than HC. This means that plants play an important role on arsenic retention in the constructed wetlands mesocosm. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 1332–1339, 2014

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Heavy metals and arsenic phytoavailability index in pioneer plants from a semipermanent natural wetland

Gómez-Bernal

Ruíz-Huerta

Armienta

et al. 2017

Env Prog and Sustain Energy

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The total concentration of Pb, Zn, Cu, Fe, Mn, and As in mining‐impacted soils and pioneer plants from a semi‐permanent natural wetland was determined by X‐ray fluorescence. Results showed that the maximum values in soil were Fe > Zn > Pb > Mn > As > Cu and in plants were Zn > Pb > As > Cu, and Mn and Fe were found in variable concentrations. Bouteloa repens showed the highest translocation factor (TF) for all heavy metals, and the highest phytoavailability index (PI) for Fe, Cu, As, and Mn. However, Typha dominguensis was the plant species with the most elevated bioconcentration factor (BCF) for Mn and Fe and PI for Pb and Zn, while Cyperus manimae showed the maximum BCF for As, Pb, and Cu, and the highest PI for Mn. For Eleocharis ovata the maximum BCF and PI were for Zn and As, respectively. The PI indicates the availability of heavy metals and As in the environment and their bioaccumulation in plants. The plant species reported in this study are pioneer plants that can easily become established due to their environmental resilience and physiologic characteristics. This study shows that B. repens and T. dominguensis are species that translocate heavy metals and accumulate them in their various organs, and therefore, these plants are suggested as good candidates for phytostabilization in similar semi‐permanent natural wetlands. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 980–988, 2018

show abstract

Fate and distribution of arsenic in laboratory-scale subsurface horizontal-flow constructed wetlands treating an artificial wastewater

Cited by 32 publications

References 39 publications

Effects of the Use of Ornamental Plants and Different Substrates in the Removal of Wastewater Pollutants through Microcosms of Constructed Wetlands

Effects of the Use of Ornamental Plants and Different Substrates in the Removal of Wastewater Pollutants through Microcosms of Constructed Wetlands

Redox potential and pH behavior effect on arsenic removal from water in a constructed wetland mesocosm

Heavy metals and arsenic phytoavailability index in pioneer plants from a semipermanent natural wetland

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