Processes impacting on benzene removal in vertical-flow constructed wetlands

Tang, Xianqiang; Eke, Paul Emeka; Scholz, Miklas; Huang, Suiliang

doi:10.1016/j.biortech.2008.05.038

Cited by 47 publications

(22 citation statements)

References 36 publications

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“…In recent years, interest has grown in using phytoremediation processes for the elimination of recalcitrant organic substances from waste and groundwater, including chloroaromatics (Gilbert and Crowley 1997), chlorinated benzenes (Braeckevelt et al 2007(Braeckevelt et al , 2008, dichloroethene (Imfeld et al 2009), or benzene (Tang et al 2009;Guerin 2008). Therefore, more economic in terms of energy consumption and operation costs, these approaches are desirable for groundwater remediation.…”

mentioning

confidence: 98%

Fate of Chlorinated Benzenes in Laboratory Peat and Pozzolana Filters

Cottin¹,

Merlin²

2010

Water Air Soil Pollut

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The removal of chlorinated benzenes (CBs) from the compartments and from polluted industrial sites is of great public interest for the decontamination of polluted water and for the protection of the environment. Biological degradation could be considered as a feasible process to eliminate these compounds from the environment as soil or groundwater. A research program in progress since the year 2007 was initiated to investigate the capacity of eco-remediation of CB-contaminated groundwater using a pilot-scale subsurface flow constructed wetland. In order to assess the removal efficiency of these compounds and to evaluate the biological activities, column experiments were performed. The fate of three CBs was investigated by feeding spiked tap water through laboratory columns filled with two different solid-state materials: peat and pozzolana. In order to stimulate biological activity, organic matter coming from aged vertical flow constructed wetland was added to the media.Concentrations of CBs in water effluent and in air and biological activities were monitored during 4 months. At the end of the experimental period, CB concentrations in the depth of columns were determined and a mass balance was calculated for the CBs. Removal efficiencies of the laboratory columns were >98% in the peat columns and situated around 87% to 95% in the pozzolana columns, indicating the suitability of the experimental systems for the removal of CBs. Higher effluent CB concentrations from the pozzolana columns were detected. Concentration of CBs in ambient air indicates that volatilization was low. ATP monitoring, reduction of tetrazolium violet, and exopolysaccharide determination indicated considerable biological activity with variations according to column depth and carrier material.

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confidence: 98%

Fate of Chlorinated Benzenes in Laboratory Peat and Pozzolana Filters

Cottin¹,

Merlin²

2010

Water Air Soil Pollut

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“…On the other hand, the appropriate design, operation and evaluation of CW systems are crucial as well as contingent on a good understanding of the internal treatment processes and mechanisms. Regression analysis has been found to be useful for simplified description and analysis of CW systems performance as they provide a means of understanding their treatment process/mechanism (Tomenko et al, 2007;Murray-Gulde et al, 2008;Tang et al, 2009). Although, there are many more approaches with stronger capabilities that could be used to model CW systems performance such as artificial neural networks and multi-component reactive transport module (CW2D) (Langergraber, 2008;Akratos et al, 2009), the use of these complex approaches has been limited and yet to be proven.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation and prediction for a pilot two-stage on-site constructed wetland system employing dewatered alum sludge as main substrate

Babatunde

Zhao

Doyle

et al. 2011

Bioresource Technology

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Publication informationBioresource Technology, 102 (10): 5645-5652Publisher Elsevier AbstractDewatered alum sludge, a widely generated by-product of drinking water treatment plants using aluminium salts as coagulants was used as main substrate in a pilot on-site constructed wetland system treating agricultural wastewater for 11 months. Treatment performance was evaluated and spreadsheet analysis was used to establish correlations between water quality variables. Results showed that removal rates (in g/m 2 .d) of 4.6-249.2 for 5 day biochemical oxygen demand (BOD 5 ), 35.6-502.0 for chemical oxygen demand (COD), 2.5-14.3 for total phosphorus (TP) and 2.7-14.6 for phosphate (PO 4 -P) were achieved. Multiple regression analysis showed that effluent BOD 5 and COD can be predicted to a reasonable accuracy (R 2 =0.665 and 0.588, respectively) by using input variables which can be easily monitored in real time as sole predictor variables. This could provide a rapid and cheap alternative to such laborious and time consuming analyses and also serve as management tools for day-to-day process control.

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“…The removal rates for petroleum hydrocarbons in aerated subsurface-flow wetlands are considerably higher than in non-aerated wetlands (Wallace and Kadlec 2005). Low-molecular-weight hydrocarbons such as benzene are treated by vertical-flow constructed wetlands achieving efficiencies between 88-89 and 72-80 % for indoor and outdoor constructed wetlands, respectively (Tang et al 2009). …”

Section: Volatile Organic Compounds (Vocs) and Hydrocarbonsmentioning

confidence: 98%