Removal of dimethylphenols from an artificial wastewater in a laboratory-scale wetland system planted with Juncus effusus

Schultze-Nobre, Luciana; Wießner, Arndt; Wang, Dandan; Bartsch, Cindy; Kappelmeyer, Uwe; Paschke, Heidrun; Mattusch, Jürgen; Kuschk, Peter

doi:10.1016/j.ecoleng.2014.11.056

Cited by 15 publications

(12 citation statements)

References 29 publications

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“…The results obtained during this study confirm the importance of plants in phenolic compound removal processes, which is in line with previous findings . They also verify the strong influence of inflow loads on removal efficiency . Similar DMP removal dynamics were found in both planted CWs, (Fig.…”

Section: Discussionsupporting

confidence: 92%

“…The related toxicity may be caused not only by the inflow DMP load but also by the generation of intermediates during phenol transformation, such as catechol, hydroquinone and other organics [3,6,29]. The negative effects of high DMP concentrations on the growth of Juncus effusus and the elimination efficiency have already been reported [27][28][29]. However, the gradual increase in stalk density in the PG-CW clearly indicates a limited toxicity effect in this CW design.…”

Section: Discussionmentioning

confidence: 87%

“…It is characteristic that under the highest DMP load (phase C), the planted CWs removed more than 3 g DMP/m²/d compared to only 0.6 g NH 4 + -N/m²/d (respective values for the unplanted bed: 2 g DMP/m²/d and 0 g NH 4 + -N/m²/d). The high plant density, the high and increasing redox values and the different DMP-isomer's removal rates indicate the presence of mainly aerobic microbial transformation processes and secondary the uptake and adsorption of the phenols by plant matter and substrate media [5,17,27,29]. The necessary oxygen may be supplied either by the plant roots, the oxygen dissolved in the influent saturated wastewater or by air diffusion through the unsaturated gravel zone into the upper pore water of the wetland.…”

Section: Discussionmentioning

confidence: 99%

“…Specifically, experiments in a PFBR system planted with Juncus effusus showed that a stepwise increase in the inflow DMP concentration from 20 mg/L to 100 mg/L caused a decrease in total DMP removal efficiency. The highest removal efficiencies were observed for the 3,4‐ and 3,5‐DMP isomers and the lowest for 2,6‐DMP . Intermediates resulting from the DMP degradation (such as dimethylbenzenediols and ketoadipic acid carboxylates) and oxidative coupling products (such tetramethyl‐[1,1’‐biphenyl] diols and tetramethyl diphenylether monools) were found in small amounts .…”

Section: Introductionmentioning

confidence: 99%

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Removal of dimethylphenols and ammonium in laboratory‐scale horizontal subsurface flow constructed wetlands

Schultze-Nobre

Wießner

Bartsch

et al. 2017

Engineering in Life Sciences

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Phenolic compounds in industrial wastewaters are toxic pollutants and pose a threat to public health and ecosystems. More recently, focus is being directed toward combining the treatment of these compounds with a cost‐effective and environmentally sound technology. The removal efficiency of dimethylphenol and ammonium nitrogen was studied, for the first time, in three different laboratory‐scale horizontal subsurface flow constructed wetlands planted with Juncus effusus. Two of the wetlands used were filled with gravel. One of these was planted and the second left without vegetation. The third wetland was a hydroponic system. It was found that the removal efficiencies of dimethylphenol was dependent on the inflow loading of the contaminant and was higher in the planted systems. Both planted systems yielded 99% removal efficiency up to loads of 240 mg/d, compared to only 73% for the unplanted constructed wetland. Factors and processes such as redox dynamics, methanogenesis, reduction of ammonium and low nitrate and nitrite concentrations imply simultaneous aerobic and anaerobic dimethylphenol transformations. A significant surplus of organic carbon was detected in the planted wetlands, which may originate from intermediates of the dimethylphenol transformation processes and/or organic plant root exudates. The present study demonstrates that horizontal subsurface flow constructed wetlands are a promising alternative system for the treatment of effluents contaminated with dimethylphenol isomers.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Removal of dimethylphenols and ammonium in laboratory‐scale horizontal subsurface flow constructed wetlands

Schultze-Nobre

Wießner

Bartsch

et al. 2017

Engineering in Life Sciences

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“…More interestingly, Ag and CeO 2 NPs appear to bind less strongly to sediment constituents than their ionic counterparts, rendering the nanoparticles more mobile. Schultze-Nobre et al (2015) utilized a laboratory-scale planted fixed bed reactor planted with the helophyte Juncus effusus for long-term experiments in the treatment of artificial industrial wastewater using a mixture of 2,6-, 3,4-, and 3,5-dimethylphenol (DMP). The permanent circulation flow of the process water in the reactor made it possible to simulate the rooted zone of the CW.…”

Section: This Special Issuementioning

confidence: 99%