Continuous removal and recovery of tellurium in an upflow anaerobic granular sludge bed reactor

Mal, Joyabrata; Nancharaiah, Y.V.; Maheshwari, Neeraj; Hullebusch, Eric D. van; Lens, Piet N.L.

doi:10.1016/j.jhazmat.2016.12.052

Cited by 57 publications

(33 citation statements)

References 53 publications

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“…However, compared to control SBR, proteins a and e had a significant overexpression after being acclimated with 4‐CP, and protein b only existed in acclimated SBR. This confirmed that proteins’ expression was significantly influenced by pollutants (Mal et al, ). To analyse the influence of dominant proteins on 4‐CP biodegradation and sludge toxicity, the marked protein bands in acclimated SBR were identified.…”

Section: Resultssupporting

confidence: 71%

“…Furthermore, the damage of chlorophenols to microbes, the elimination of toxic secondary metabolites under chlorophenols stress and the formation of sludge flocculation are related to proteins (Carvalho et al, ). Protein content is apt to frequent enrichment, and the activities of different key enzymes in activated sludge are also influenced after being exposed to pollutants (Li et al, ; Mal et al, ). Therefore, analysing the changes of proteins in chlorophenols wastewater treatment is imperative.…”

Section: Introductionmentioning

confidence: 99%

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Effects of hydraulic retention time and proteins on sludge toxicity for 4‐chlorophenol wastewater treatment in sequencing batch reactors

Zhao

Chen

et al. 2018

Water & Environment J

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Due to the higher uncertainty of environmental risk for pollutants’ treatment by activated sludge, 10 mg/L influent 4‐chlorophenol (4‐CP) treated via a sequencing batch reactor (SBR) was used as acclimated SBR. Another SBR was used as control SBR without 4‐CP. The effects of hydraulic retention time (HRT) and proteins on sludge toxicity for 4‐CP treatment were analysed, and compared to the control SBR. Results showed that the sludge toxicity in acclimated SBR was significantly higher than that of the control SBR. Shortening HRT from 12 to 8 hours was beneficial to degrade 4‐CP and lower sludge toxicity. The identified highly expressed protein of ABC transporter co‐existed in control and acclimated SBRs, while other proteins of TonB‐dependent receptor, heat shock 70 kDa protein and superoxide dismutase in acclimated sludge were overexpressed relative to the control sludge, which played an important function in degrading 4‐CP, resisting 4‐CP toxicity and eliminating sludge toxicity.

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Section: Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Effects of hydraulic retention time and proteins on sludge toxicity for 4‐chlorophenol wastewater treatment in sequencing batch reactors

Zhao

Chen

et al. 2018

Water & Environment J

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“…Te-oxyanion removal started immediately after the initial TeO 3 2− addition [165]. Particularly, after the first 3-4 weeks of sludge incubation in the reactor, a significant improvement of TeO 3 2− removal efficiency was observed, suggesting an adaptation of the microbial consortium to the presence of this oxyanion [165]. Furthermore, TeO 3…”

Section: Teomentioning

confidence: 95%

“…2− removal from wastewater using a UASB bioreactor was also recently investigated by Mal and coworkers, which inoculated a UASB reactor with anaerobic granular sludge fed with lactate as carbon source, with a hydraulic retention time of 12 h at 30°C [165]. In the UASB reactor, firstly a concentration of 10 mg L −1 of TeO 3 2− was added, which was subsequently increased after 42 days to 20 mg L −1 .…”

Section: Teomentioning

confidence: 98%

“…was almost completely bioconverted to its elemental state in the form of Te-nanostructures associated with the loosely bound EPS fraction surrounding the sludge, suggesting a pivotal role played by EPS and its functional groups in the biogenesis of Te-nanoprecipitates. In this regard, the possibility to easily recover Te-nanostructures associated with the EPS fraction opens new possibility to combine oxyanion removal with the recovery of Te 0 [165].…”

Section: −mentioning

confidence: 99%

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Microbial-Based Bioremediation of Selenium and Tellurium Compounds

Piacenza¹,

Presentato²,

Zonaro³

et al. 2018

Biosorption

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The chalcogens selenium (Se) and tellurium (Te) are rare earth elements, which are mainly present in the environment as toxic oxyanions, due to the anthropogenic activities. Thus, the increased presence of these chalcogen-species in the environment and the contamination of wastewaters nearby processing facilities led to the necessity in developing remediation strategies aimed to detoxify waters, soils and sediments. Among the different decontamination approaches, those based on the ability of microorganisms to bioaccumulate, biomethylate or bioconvert Se-and/or Te-oxyanions are considered the leading strategy for achieving a safe and eco-friendly bioremediation of polluted sites. Recently, several technologies based on the use of bacterial pure cultures, bacterial biofilms or microbial consortia grown in reactors with different configurations have been explored for Se-and Te-decontamination purposes. Further, the majority of microorganisms able to process chalcogen-oxyanions have been described to generate valuable Se-and/or Te-nanomaterials as end-products of their bioconversion, whose potential applications in biomedicine, optoelectronics and environmental engineering are still under investigation. Here, the occurrence, the use and the toxicity of Se-and Te-compounds will be briefly overviewed, while the microbial mechanisms of chalcogen-oxyanions bioprocessing, as well as the microbialbased strategies used for bioremediation approaches will be extensively described. Biosorption 132Biosorption 136Microbial-Based Bioremediation of Selenium and Tellurium Compounds

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Formation of Se(0), Te(0), and Se(0)–Te(0) nanostructures during simultaneous bioreduction of selenite and tellurite in a UASB reactor

Wadgaonkar

Mal

Nancharaiah

et al. 2018

Appl Microbiol Biotechnol

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Simultaneous removal of selenite and tellurite from synthetic wastewater was achieved through microbial reduction in a lab-scale upflow anaerobic sludge blanket reactor operated with 12 h hydraulic retention time at 30 °C and pH 7 for 120 days. Lactate was supplied as electron donor at an organic loading rate of 528 or 880 mg COD L day. The reactor was initially fed with a synthetic influent containing 0.05 mM selenite and tellurite each (phase I, day 1-60) and subsequently with 0.1 mM selenite and tellurite each (phase II, day 61-120). At the end of phase I, selenite and tellurite removal efficiencies were 93 and 96%, respectively. The removal percentage dropped to 87 and 81% for selenite and tellurite, respectively, at the beginning of phase II because of the increased influent concentrations. The removal efficiencies of both selenite and tellurite were gradually restored within 20 days and stabilized at ≥ 97% towards the end of the experiment. Powder X-ray diffraction and Raman spectroscopy confirmed the formation of biogenic Se(0), Te(0), and Se(0)-Te(0) nanostructures. Scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy showed aggregates comprising of Se(0), Te(0), and Se-Te nanostructures embedded in a layer of extracellular polymeric substances (EPS). Infrared spectroscopy confirmed the presence of chemical signatures of the EPS which capped the nanoparticle aggregates that had been formed and immobilized in the granular sludge. This study suggests a model for technologies for remediation of effluents containing Se and Te oxyanions coupled with biorecovery of bimetal(loid) nanostructures.

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Continuous removal and recovery of tellurium in an upflow anaerobic granular sludge bed reactor

Cited by 57 publications

References 53 publications

Effects of hydraulic retention time and proteins on sludge toxicity for 4‐chlorophenol wastewater treatment in sequencing batch reactors

Effects of hydraulic retention time and proteins on sludge toxicity for 4‐chlorophenol wastewater treatment in sequencing batch reactors

Microbial-Based Bioremediation of Selenium and Tellurium Compounds

Formation of Se(0), Te(0), and Se(0)–Te(0) nanostructures during simultaneous bioreduction of selenite and tellurite in a UASB reactor

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