A kinetic study of biological Cr(VI) reduction in trickling filters with different filter media types

Dermou, Eftychia; Vayenas, D.V.

doi:10.1016/j.jhazmat.2006.11.017

Cited by 13 publications

(9 citation statements)

References 19 publications

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“…23 However, the above sharp drop was not observed for biological Cr(VI) reduction in previous research by our research team. 24 Therefore, it was assumed that the adsorption phenomena on Cr(VI) concentration in the current study can be ascribed to the new mixed bacterial culture grown on the pilot-scale packed bed reactor, which resulted in a different formation of the biofilm layer and structure.…”

Section: Results and Discussion Phenol Inhibitory Effects In The Presmentioning

confidence: 97%

Simultaneous phenol removal and biological reduction of hexavalent chromium in a packed‐bed reactor

Tziotzios

Dermou

Politi

et al. 2008

J of Chemical Tech & Biotech

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BACKGROUND: Phenol and hexavalent chromium are considered industrial pollutants that pose severe threats to human health and the environment. The two pollutants can be found together in aquatic environments originating from mixed discharges of many industrial processes, or from a single industry discharge. The main objective of this work was to study the feasibility of using phenol as an electron donor for Cr(VI) reduction, thus achieving the simultaneous biological removal/reduction of the two pollutants in a packed-bed reactor.

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Section: Results and Discussion Phenol Inhibitory Effects In The Presmentioning

confidence: 97%

Simultaneous phenol removal and biological reduction of hexavalent chromium in a packed‐bed reactor

Tziotzios

Dermou

Politi

et al. 2008

J of Chemical Tech & Biotech

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“…Members of Acinetobacter are well described for the intracellular reduction of Cr(VI) to Cr(III) under aerobic conditions (Ahmad, Zakaria, Khasim, Alias, & Ismail, ; Bhattacharya, Gupta, Kaur, & Malik, ; Dermou & Vayenas, ). Bacteria related to the Comamonadaceae family likely reduce Cr(VI) to Cr(III) under aerobic conditions (Lai et al, ).…”

Section: Resultsmentioning

confidence: 99%

Resilient biological hexavalent chromium removal with a two‐stage, fixed‐bed biotreatment system

Upadhyaya¹,

Dunagan²,

Mattingly

et al. 2019

AWWA Water Science

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Hexavalent chromium (Cr(VI)) can be biologically reduced to nontoxic and easily separable trivalent chromium (Cr(III)) without generating concentrated wastes.Using a 6-25 gpm pilot-scale two-stage, fixed-bed (FXB), biologically active carbon (BAC) treatment system, approximately 75 μg/L Cr(VI) was consistently removed to less than 7 μg/L with a 10-min empty-bed contact time. Potential Cr(VI)-reducing bacteria, including members from the Dechloromonas and Acinetobacter genera, were present in the system. The system was resilient, and 91% Cr removal was observed when the system was challenged with a 24-h phosphoric acid feed shutdown, a 3-day system shutdown, spiking Cr(VI) to 100 μg/L, or operating intermittently with regular shutdown periods of hours to days. The system recovered within 6 h after a 26-h acetic acid feed shutdown. Readily settling backwash wastewater was generated with characteristics similar to municipal wastewater. Overall, the results indicated that a two-stage, FXB BAC system can provide an effective and robust option for Cr(VI) removal. K E Y W O R D Sbackwash, backwash wastewater, biological, bioreactor, fixed-bed, hexavalent chromium, microbial community, robustness

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“…6). Although immediate comparison with other data from the literature exhibits difficulties due to the different experimental systems and conditions used, the reduction rates achieved in this work are among the greatest ever reported 14–18, 23, 24. The achieved reduction rate of about 1.1 kg Cr(VI) m −2 d −1 indicates that a trickling filter with a diameter of only 1.5 m, at the same height as the pilot‐scale filter, could replace several tanks, basins, processes and of course addition of chemical at the particular industry.…”

Section: Resultsmentioning

confidence: 81%

Biological Cr(VI) reduction in a trickling filter under continuous operation with recirculation

Dermou

Vayenas

2008

J of Chemical Tech & Biotech

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BACKGROUND: Hexavalent chromium (Cr(VI)) is toxic to humans, animals and plants. Conventional treatment technologies reduce Cr(VI) to the less toxic and mobile Cr(III), but these methods are usually expensive and generate secondary waste. Microbial Cr(VI) reduction has recently gained attention as a detoxification process, since it enables Cr(VI) reduction through relatively cheap and simple methods. The aim of this work was to investigate the mechanism and the performance of biological Cr(VI) reduction using mixed cultures originated from industrial sludge under continuous operation with recirculation in a pilot-scale trickling filter.

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A kinetic study of biological Cr(VI) reduction in trickling filters with different filter media types

Cited by 13 publications

References 19 publications

Simultaneous phenol removal and biological reduction of hexavalent chromium in a packed‐bed reactor

Simultaneous phenol removal and biological reduction of hexavalent chromium in a packed‐bed reactor

Resilient biological hexavalent chromium removal with a two‐stage, fixed‐bed biotreatment system

Biological Cr(VI) reduction in a trickling filter under continuous operation with recirculation

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