Preliminary study on the potential of arsenic removal by subsurface flow constructed mesocosms

Zurita, Florentina; Del‐Toro‐Sánchez, Carmen Lizette; Gutiérrez-Lomelí, Melesio; Rodríguez-Sahagún, Araceli; Castellanos-Hernández, Osvaldo A.; Ramírez-Martínez, Gerardo; White, John R.

doi:10.1016/j.ecoleng.2012.06.018

Cited by 29 publications

(17 citation statements)

References 26 publications

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“…This agrees with previous studies from the same research group, in laboratory and pots scale . Other plants Zantedeschia aethiopica and Anemopsis californica have been reported effective on arsenic removal from drinking water using subsurface flow constructed wetlands, but fed batch .…”

Section: Resultssupporting

confidence: 92%

“…At the experiment ending, arsenic immobilization on planted wetlands was 32-41% higher than unplanted. In addition, this percentage was higher than other researches, in which 15% [13] and 20% [8] of the arsenic retention were reported from planted with regard of unplanted wetlands. However, it is necessary to consider that reduced compounds of sulfur-arsenic existing in the media had a good chance of re-oxidation, and with that, the possibility of arsenic release.…”

Section: Arsenic Retentioncontrasting

confidence: 72%

“…Zurita et al, reported similar pH values, ranged from 7.2 to 8.1 in planted wetlands, whereas unplanted wetlands ranged from 8.1 to 8.5; arguing that pH values decreased as result of organic acid release, which was caused by root decomposition, as well as sulfide oxidation (O 2 provided to the rhizosphere) [8].…”

Section: Phmentioning

confidence: 96%

“…Even though plants and gravel had separately arsenic retention capability, a combination of both, is synergistically efficient. So, wetlands systems with gravel and plants had a better performance than only soil or only plants systems [2,8,13,30].…”

Section: Wetland/ Sectionmentioning

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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Section: Resultssupporting

confidence: 92%

Section: Arsenic Retentioncontrasting

confidence: 72%

Section: Phmentioning

confidence: 96%

Section: Wetland/ Sectionmentioning

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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“…According to some authors [41], a decrease in EC despite significant water losses is explained by uptake of micro and macroelements and ions by plants and their removal through adsorption to plant roots, litter and settled suspended particles. Moreover, the ground tezontle rock used as the media in the CWs has demonstrated a high capacity for total dissolved solid removal in previous studies [42]. The final values in the three effluents averaged less than 1.5 dS/m, which is considered as the threshold value from which a reduction in crop yield potential due to salinity, can be expected in salt-sensitive species [43,44].…”

Section: Electrical Conductivity (Ec)mentioning

confidence: 99%

Comparative Study of Three Two-Stage Hybrid Ecological Wastewater Treatment Systems for Producing High Nutrient, Reclaimed Water for Irrigation Reuse in Developing Countries

Zurita

White

2014

Water

Self Cite

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In this study, three different two-stage hybrid ecological wastewater treatment systems (HEWTS) with combinations of horizontal flow (HF) constructed wetlands (CWs), vertical flow (VF) CWs and stabilization ponds (SP) were evaluated for the removal of Organic-N, NH 4 + , NO 3 − , Total N, Total P, Total Coliforms (TCol) and Escherichia Coli, BOD, COD and TSS. The overall goal of the study was novel in comparison to most other studies in that we sought to evaluate and compare the efficiency of the three HEWTSs for water quality improvements, while minimizing nutrient removal from the wastewater in order to generate high quality reclaimed water for reuse for irrigation of crops. The most effective systems were those systems containing a vertical flow component, either HF-VF or VF-HF. In these two HEWTS, NH 4 + was reduced by 85.5% and 85.0% respectively, while NO 3 − was increased to 91.4 ± 17.6 mg/L and to 82.5 ± 17.2 mg/L, respectively, an artifact of nitrification. At the same time, E. coli was reduced by 99.93% and 99.99%, respectively. While the goal of most wastewater treatment is focused on reducing nutrients, the results here demonstrate that two-stage HEWTSs containing VF components can be used to produce a high quality effluent while retaining inorganic nutrients, thereby conserving this valuable resource for reuse as irrigation water for agriculture in subtropical developing countries where water and fertilizer resources are scarce or expensive.

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A Comparison of Technologies for Remediation of Arsenic-Bearing Water: The Significance of Constructed Wetlands

Ali

Hussain

Niazi

et al. 2022

Global Arsenic Hazard

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Preliminary study on the potential of arsenic removal by subsurface flow constructed mesocosms

Cited by 29 publications

References 26 publications

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

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

Comparative Study of Three Two-Stage Hybrid Ecological Wastewater Treatment Systems for Producing High Nutrient, Reclaimed Water for Irrigation Reuse in Developing Countries

A Comparison of Technologies for Remediation of Arsenic-Bearing Water: The Significance of Constructed Wetlands

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