The Membrane Biofilm Reactor Is a Versa Tile Platform for Water and Wastewater Treatment

Rittmann, Bruce E.

doi:10.4491/eer.2007.12.4.157

Cited by 83 publications

(34 citation statements)

References 58 publications

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“…For biological reduction, a microbiologically available electron donor must be added. Hydrogen gas (H 2 ) is the ideal electron donor, because it is non-toxic, is relatively inexpensive, and supports autotrophic bacteria that require no organic C source (Lee & Rittmann 2002;Nerenberg et al 2002;Rittmann et al 2004;Rittmann 2007). …”

Section: Introductionmentioning

confidence: 98%

Simultaneous bio-reduction of trichloroethene, trichloroethane, and chloroform using a hydrogen-based membrane biofilm reactor

Chung

Rittmann

2008

Water Science and Technology

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The contamination of water by chlorinated solvents is recognized as a serious and widespread problem throughout the industrialized world. Here, we focus on three chlorinated solvents that are among those most commonly detected and that have distinct chemical features: trichloroethene (TCE), trichloroethane (TCA), and chloroform (CF). Because many contaminated waters contain mixtures of the chlorinated solvents, a treatment technology that detoxifies all of them simultaneously is highly desirable. The membrane biofilm reactor (MBfR) is a recent technological advance that makes it possible to deliver H(2) gas to bacteria efficiently and safely, despite hydrogen's low water solubility and risk of forming a combustible atmosphere when mixed with air. The objectives of this work are to document whether or not the three chlorinated compounds can be dechlorinated simultaneously in a H(2)-based MBfR and to determine if competitive or inhibitory interactions affect bio-reduction of any of the solvents. The main finding is a demonstration that directly using H(2) as the electron donor makes it possible to bio-reduce combinations of different chlorinated solvents. This finding supports that the H(2)-based MBfR can treat multiple chlorinated solvents in one step, addressing a common groundwater situation. We saw possible evidence of inhibition by CF at a concentration greater than about 1 muM, competition for H(2) from sulfate and nitrate reductions, and possible inhibition of TCE reduction from the accumulation of chloroethane (CA) or chloromethane (CM).

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Section: Introductionmentioning

confidence: 98%

Simultaneous bio-reduction of trichloroethene, trichloroethane, and chloroform using a hydrogen-based membrane biofilm reactor

Chung

Rittmann

2008

Water Science and Technology

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“…This hydrogen acts as a substrate for bacterial growth and reduction. Autotrophic bacteria are used for the biofilm instead of heterotrophs, which offers an advantage of less sludge production over the previously mentioned method [19]. The underlying chemical reaction is represented below: SeO…”

Section: Biological Treatmentmentioning

confidence: 99%

“…In the precipitation method, the sulfide ion is used as the most common precipitating agent for selenium removal. Compounds such as sodium dithionite and sodium sulfide are used as a source of sulfide ions in the industry [19]. The typical reaction of selenite by sulfide is given by…”

Section: Chemical Treatmentmentioning

confidence: 99%

Mining-Related Selenium Contamination in Alaska, and the State of Current Knowledge

et al. 2017

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Selenium pollution has been a topic of extensive research dating back further than the last decade and has attracted significant attention from several environmental and regulatory agencies in order to monitor and control its discharge from myriad industrial sources. The mining industry is a prime contributor of hazardous selenium release in the aquatic systems and is responsible for both acute and chronic impacts on living organisms. Herein we provide an overview of selenium contamination issues, with a specific focus on selenium release from mining industries, including a discussion of various technologies commonly employed to treat selenium-impacted waters from mining discharge. Different cases pertaining to selenium release from Alaskan mines (during years [2000][2001][2002][2003][2004][2005][2006][2007][2008][2009][2010][2011][2012][2013][2014][2015] are also presented, along with measures taken to mitigate high concentration releases. For continued resource exploration and economic development activities, as well as environmental preservation, it is important to fundamentally understand such emerging and pressing issues as selenium contamination and investigate efficient technological approaches to counter these challenges.

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“…1). Although solubility of H 2 increases with decreasing temperature, difficulties with substrate delivery through gas input has been recorded previously (40). Also, as this was a methanol-adapted strain of M. barkeri, it is plausible that the metabolic capacity to reduce CO 2 using electrons from H 2 was thermodynamically unfavorable under submesophilic conditions, as suggested by growth curve analysis (Fig.…”

Section: Resultsmentioning

confidence: 90%

A Functional Approach To Uncover the Low-Temperature Adaptation Strategies of the Archaeon Methanosarcina barkeri

Gunnigle

McCay

Fuszard

et al. 2013

Appl Environ Microbiol

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b Low-temperature anaerobic digestion (LTAD) technology is underpinned by a diverse microbial community. The methanogenic archaea represent a key functional group in these consortia, undertaking CO 2 reduction as well as acetate and methylated C 1 metabolism with subsequent biogas (40 to 60% CH 4 and 30 to 50% CO 2 ) formation. However, the cold adaptation strategies, which allow methanogens to function efficiently in LTAD, remain unclear. Here, a pure-culture proteomic approach was employed to study the functional characteristics of Methanosarcina barkeri (optimum growth temperature, 37°C), which has been detected in LTAD bioreactors. Two experimental approaches were undertaken. The first approach aimed to characterize a low-temperature shock response (LTSR) of M. barkeri DSMZ 800 T grown at 37°C with a temperature drop to 15°C, while the second experimental approach aimed to examine the low-temperature adaptation strategies (LTAS) of the same strain when it was grown at 15°C. The latter experiment employed cell viability and growth measurements (optical density at 600 nm [OD 600 ]), which directly compared M. barkeri cells grown at 15°C with those grown at 37°C. During the LTSR experiment, a total of 127 proteins were detected in 37°C and 15°C samples, with 20 proteins differentially expressed with respect to temperature, while in the LTAS experiment 39% of proteins identified were differentially expressed between phases of growth. Functional categories included methanogenesis, cellular information processing, and chaperones. By applying a polyphasic approach (proteomics and growth studies), insights into the low-temperature adaptation capacity of this mesophilically characterized methanogen were obtained which suggest that the metabolically diverse Methanosarcinaceae could be functionally relevant for LTAD systems.

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The Membrane Biofilm Reactor Is a Versa Tile Platform for Water and Wastewater Treatment

Cited by 83 publications

References 58 publications

Simultaneous bio-reduction of trichloroethene, trichloroethane, and chloroform using a hydrogen-based membrane biofilm reactor

Simultaneous bio-reduction of trichloroethene, trichloroethane, and chloroform using a hydrogen-based membrane biofilm reactor

Mining-Related Selenium Contamination in Alaska, and the State of Current Knowledge

A Functional Approach To Uncover the Low-Temperature Adaptation Strategies of the Archaeon Methanosarcina barkeri

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