Dynamics of sulphur compounds in horizontal sub-surface flow laboratory-scale constructed wetlands treating artificial sewage

Wießner, Arndt; Rahman, Khaja Zillur; Kuschk, Peter; Kästner, Matthias; Jechorek, M.

doi:10.1016/j.watres.2010.07.044

Cited by 47 publications

(26 citation statements)

References 37 publications

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Section: Resultsmentioning

confidence: 99%

“…During the experiment without hydrogen injection, we observed an nearly unchanged pH level, an increase in the sulfate concentration and comparably reduced removal rates for aluminum and manganese as well as inefficient removal of zinc. The sulfate concentration increase was likely caused by reoxidation of reduced sulfur generated during the operational start-up period without AMD inflow [28,29]. While injecting the higher hydrogen load the redox potential oscillated with a maximum amplitude of E h = 449 mV in the range of about −150 to +300 mV during approximately the first half of the total experimental period (Fig.…”

Section: Removal Of Sulfate and Metals And Dynamics Of Ph And E Hmentioning

confidence: 98%

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Injection of hydrogen gas stimulates acid mine drainage treatment in laboratory‐scale hydroponic root mats

Richter

Wießner

Zehnsdorf

et al. 2016

Engineering in Life Sciences

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The environmentally benign disposal of acid mine drainage (AMD) is still a technical challenge. In the present study, artificial AMD was treated in a laboratory‐scale floating hydroponic root mat of soft rush, Juncus effusus. This ecotechnological system was operated with hydrogen injection and water recirculation but without an external carbon supply. It achieved a mean increase of ΔpH = 3.3 up to pH ≈ 8.2, high sulfate removal of up to 87%, and efficient removal of iron (100%), aluminum (99.8%), manganese (97.4%), and zinc (99.6%). Sulfide was not detected in the outflow. Treatment performance correlated with the amount of hydrogen loading. Daily oscillations of the redox potential up to amplitudes of ΔEh ≈ 450 mV in a mean range of Eh ≈ −150 to +300 mV indicated a correlation of plant physiology and removal processes. Apparently, sulfate and metal removal were the result of chemolithotrophic microbial sulfate reduction supported by the externally provided H2 and chemoorganotrophic sulfate reduction driven by rhizodeposits. Bicarbonate generated in the microbial transformation of such plant‐derived organic carbon contributed to pH neutralization. The effluent's pH increase was governed further by recirculation of the treated AMD. The flow regime and the injection of hydrogen at the ground of the root mat caused concentration gradients where the most efficient removal occurred in the deepest zone of the root mat. Further investigations should target long‐term stability, plant growth dynamics, load variations, balances of carbon and sulfur, the removal of H2S and metal precipitates from the system as well as efficient hydrogen supply.

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Section: Resultsmentioning

confidence: 99%

Section: Removal Of Sulfate and Metals And Dynamics Of Ph And E Hmentioning

confidence: 98%

Injection of hydrogen gas stimulates acid mine drainage treatment in laboratory‐scale hydroponic root mats

Richter

Wießner

Zehnsdorf

et al. 2016

Engineering in Life Sciences

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“…(Gonzalias, 2007;Kalipci, 2011;González, 2014). Esta planta ha sido ampliamente utilizada para la remoción de nitrógeno y fosforo, obteniendo resultados de remoción del 88 y 99% respectivamente (Wiessner, 2010).…”

Section: Introductionunclassified

Evaluación de la Remoción de Nitrógeno, Fósforo y Sulfuros en Agua Residual Doméstica, Utilizando Phragmites australis en Bioreactores

et al. 2015

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ResumenEn el presente estudio se evaluó la remoción de nitrógeno, fósforo y sulfuros en un agua residual doméstica mediante fitorremediación utilizando Phragmites australis en bioreactores a escala de laboratorio. Se determinó el estudio las condiciones hidráulicas en reactores analizando las variables de relación geométrica largo:ancho (4:1 y 1:4) y usando un medio filtrante (grava/arena). Adicionalmente se evaluó el crecimiento de P. australis en los reactores y se analizó los porcentajes de remoción para cada configuración. Los resultados hidráulicos indicaron que los reactores con configuración 4:1 presentan un comportamiento de flujo a pistón contrario a los reactores en configuración 1:4 que presentan una mayor tendencia de flujo mezclado. Los valores de remoción de contaminantes indican mayor remoción de fósforo (60 a 90%) en todos los medios filtrantes de los bioreactores y menor remoción de nitrógeno (13%). Los sulfuros fueron removidos en un 20%. El mayor porcentaje de remoción se presentó en los reactores de grava 4:1, siendo esta la mejor condición para optimizar la extracción usando P. australis. Palabras clave: condiciones hidráulicas, configuración geométrica, Phragmites australis, remoción de nutrientes Evaluation of Nitrogen, Phosphorus and Sulphur Removal in Domestic Wastewater, using Phragmites australis in bioreactors AbstractIn the present study, nitrogen, phosphorus and sulfur removal was evaluated in domestic wastewater by phytoremediation using Phragmites australis in laboratory scale bioreactors. The hydraulic conditions in the reactor were determined by analyzing the geometric variables long:width ratio (4: 1 and 1: 4) and using a filter medium (gravel / sand). Additionally, the P. australis growth was evaluated and removal percentages for each configuration were analyzed. The results indicated that water reactor with setting 4:1 present piston flow while configuration 1:4 present a behavior similar to mixed flow. Values of contaminant removal indicate higher phosphorus removal (60 to 90%) in all reactors and lower nitrogen removal (13%). The sulfides removal was 20%. The highest percentage of removal was presented in reactors gravel 4: 1 being the best condition to optimize the extraction of P. australis.

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“…Moreover, because sulfate is a common constituent of many contaminated wastewaters, microbial dissimilatory sulfate reduction using organic carbon as an electron donor is prevalent in horizontal, subsurface-flow constructed wetlands. Sulfate reduction has also been recognized as an important component in the removal of organic matter (Garcia et al, 2010;Stein et al, 2007;Sturman et al, 2008;Wiessner et al, 2010). However, nitrogen removal can also be negatively affected by the toxicity of reduced sulfur compounds (e.g., hydrogen sulfide) as well as by competition for oxygen (Aesoy et al, 1998;Fürtig et al, 1996;Wiessner et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Response of Removal Rates to Various Organic Carbon and Ammonium Loads in Laboratory‐Scale Constructed Wetlands Treating Artificial Wastewater

Kuschk

Wießner

et al. 2013

Water Environment Research

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High levels (92 and 91%) of organic carbon were successfuily removed from artificial wastewater by a laboratory-scale constructed wetland under inflow loads of 670 mg/m^*d (100 mg/d) and 1600 mg/m^d (240 mg/d), respectively. Acidification to pH 3.0 was observed at the low organic carbon load, which further inhibited the denitrification process. An increase in carbon load, however, was associated with a significant elevation of pH to 6.0. in general, sulfate and nitrate reduction were relatively high, with mean levels of 87 and 90%, respectively. However, inhibition of nitrification was initiated with an increase in carbon loads. This effect was probably a result of competition for oxygen by heterotrophic bacteria and an inhibitory effect of sulfide (S^^) toxicity (concentration approximately 3 mg/L). In addition, numbers of healthy stalks of ¡uncus effusus (common rush) decreased from 14 000 to 10 000/m^ with an increase of sulfide concentration, indicating the negative effect of sulfide toxicity on the wetland plants. Water Environ. Res., 85, 44 (2013).

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Dynamics of sulphur compounds in horizontal sub-surface flow laboratory-scale constructed wetlands treating artificial sewage

Cited by 47 publications

References 37 publications

Injection of hydrogen gas stimulates acid mine drainage treatment in laboratory‐scale hydroponic root mats

Injection of hydrogen gas stimulates acid mine drainage treatment in laboratory‐scale hydroponic root mats

Evaluación de la Remoción de Nitrógeno, Fósforo y Sulfuros en Agua Residual Doméstica, Utilizando Phragmites australis en Bioreactores

Response of Removal Rates to Various Organic Carbon and Ammonium Loads in Laboratory‐Scale Constructed Wetlands Treating Artificial Wastewater

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