Micropollutant removal by attached and suspended growth in a hybrid biofilm-activated sludge process

Falås, Per; Longrée, Philipp; Jansen, Jes la Cour; Siegrist, Hansruedi; Hollender, Juliane; Joss, Adriano

doi:10.1016/j.watres.2013.05.010

Cited by 154 publications

(102 citation statements)

References 35 publications

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“…A previous project operating MBBR reactors in series showed similar results for carbamazepine . The fact that carbamazepine could be degraded by this MBBR is a small success as carbamazepine is usually a very recalcitrant compound in activated sludge WWTP and it has not been degraded in other hospital wastewater-treatment projects (Nielsen et al, 2013;Kovalova et al, 2012;Falås et al, 2013;Onesios et al, 2009).…”

Section: Antidepressants/antiepilepticmentioning

confidence: 99%

“…(Bester and Schafer, 2009;Heberer et al, 2004;Hijosa-Valsero et al, 2011;Janzen et al, 2009;Li et al, 2014;Reungoat et al, 2011;Zearley and Summers, 2012). Along with such biofilm technologies, MBBR also seemed to be a promising solution to remove micro-pollutants, which cannot be removed with activated sludge treatment (Hapeshi et al, 2013;Zupanc et al, 2013;Falås et al, 2012Falås et al, , 2013.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of attached biofilm in wastewater treatment systems has shown to improve the activated sludge performance for nutrient removal (Mazumder, 2010;Randall and Sen, 1996). Falås et al (2013) demonstrated that attached biofilm contributes significantly to the overall removal of micro-pollutants in a Hybas™ system.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Biodegradation of pharmaceuticals in hospital wastewater by a hybrid biofilm and activated sludge system (Hybas)

Casas

Chhetri

Ooi

et al. 2015

Science of The Total Environment

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Section: Antidepressants/antiepilepticmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Biodegradation of pharmaceuticals in hospital wastewater by a hybrid biofilm and activated sludge system (Hybas)

Casas

Chhetri

Ooi

et al. 2015

Science of The Total Environment

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“…The carriers are small plastic disks with a mesh structure to provide a high surface area to support biofilm growth. In the previous study, the removal of DCF was attributed to biological degradation by contact with the carrier biomass, while sorption was negligible (Falås et al., 2013). MBBRs have been studied with respect to the degradation of various CECs (Hapeshi et al., 2013, Escolà Casas et al., 2015) and an improved DCF removal of MBBRs over suspended sludge was also observed in laboratory-scale reactors (Zupanc et al., 2013).…”

Section: Introductionmentioning

confidence: 96%

Transformation of diclofenac in hybrid biofilm–activated sludge processes

et al. 2016

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The biotransformation of diclofenac during wastewater treatment was investigated. Attached growth biomass from a carrier-filled compartment of a hybrid-MBBR at the wastewater treatment plant (WWTP) in Bad Ragaz, Switzerland was used to test the biotransformation. Laboratory-scale incubation experiments were performed with diclofenac and carriers and high-resolution LC–QTof-MS was implemented to monitor the biotransformation. Up to 20 diclofenac transformation products (TPs) were detected. Tentative structures were proposed for 16 of the TPs after characterization by MS2 fragmentation and/or inferring the structure from the transformation pathway and the molecular formula given by the high resolution ionic mass. The remaining four TPs were unambiguously identified via analytical reference standards. The postulated reactions forming the TPs were: hydroxylation, decarboxylation, oxidation, amide formation, ring-opening and reductive dechlorination. Incubation experiments of individual TPs, those which were available as reference standards, provided a deeper look into the transformation pathways. It was found that the transformation consists of four main pathways but no pathway accounted for a clear majority of the transformation. A 10-day monitoring campaign of the full-scale plant confirmed an 88% removal of diclofenac (from approximately 1.6 μg/L in WWTP influent) and the formation of TPs as found in the laboratory was observed. One of the TPs, N-(2,6-dichlorophenyl)-2-indolinone detected at concentrations of around 0.25 μg/L in WWTP effluent, accounting for 16% of the influent diclofenac concentration. The biotransformation of carriers was compared to a second WWTP not utilising carriers. It was found that in contact with activated sludge, similar hydroxylation and decarboxylation reactions occurred but at much slower rates, whereas some reactions, e.g. reductive dechlorination, were not detected at all. Finally, incubation experiments were performed with attached growth biomass from a third WWTP with a similar process configuration to Bad Ragaz WWTP. A similarly effective removal of diclofenac was found with a similar presence of TPs.

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“…Recent studies related to hybrid biofilms, such as moving bed biofilm reactors, biologically active filters, and integrated fixed-film activated sludge, sought to develop reinforced processes against low-concentration shock loads and prevent detachment of micro-organisms in biofilm [17][18][19].…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Organic matter removal and nitrification using a woven hollow fiber tube as biological media

Ahn

Kim

2016

Desalination and Water Treatment

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A B S T R A C TAttached growth micro-organisms are known to be beneficial to the removal of lowconcentration organic matter because they can have a long retention time due to their very slow growth rate compared with the suspended growth micro-organisms suitable for high-concentration organic substance treatment. In this study, the characteristics of the treatment of organic and nitrogen pollutants in low concentrations were investigated by injecting air into the inside of the tube, using a woven-hollow fiber tube as biological media. According to the changes in the hydraulic retention time, the biochemical oxygen demand (BOD) concentrations of the influent and the treated water were 29.8-37.6 mg/L and 8.6-18.5 mg/L, respectively. The suspended solid (SS) of the influent was 33.9-36.7 mg/L, and that of the treated water was 1.6-3.6 mg/L, showing a high SS removal efficiency of more than 90%. The investigation of the BOD and the NH 4 + -N removal efficiency according to the surface loading rate revealed that the effects caused by the increase in the surface loading rate are greater in NH 4 + -N than in BOD. The attached growth micro-organisms decreased by detachment after 20 d, and increased again, securing a constant amount of growth micro-organisms.

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Micropollutant removal by attached and suspended growth in a hybrid biofilm-activated sludge process

Cited by 154 publications

References 35 publications

Biodegradation of pharmaceuticals in hospital wastewater by a hybrid biofilm and activated sludge system (Hybas)

Biodegradation of pharmaceuticals in hospital wastewater by a hybrid biofilm and activated sludge system (Hybas)

Transformation of diclofenac in hybrid biofilm–activated sludge processes

Organic matter removal and nitrification using a woven hollow fiber tube as biological media

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