The application of membrane biological reactors for the treatment of wastewaters

Brindle, K.; Stephenson, Tom

doi:10.1002/(sici)1097-0290(19960320)49:6<601::aid-bit1>3.0.co;2-s

Cited by 287 publications

(114 citation statements)

References 44 publications

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“…The stability and performance of biological treatment processes is intimately related to biomass retention, and membrane bioreactors (MBRs) have been used for this purpose to physically retain microorganisms inside the reactor to produce solids free and better quality effluents [1,2]. Despite good COD removals and high loading rates, MBR systems often suffer from flux decline due to membrane fouling.…”

Section: Introductionmentioning

confidence: 99%

Flux and performance improvement in a submerged anaerobic membrane bioreactor (SAMBR) using powdered activated carbon (PAC)

Akram

Stuckey

2008

Process Biochemistry

150

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Section: Introductionmentioning

confidence: 99%

Flux and performance improvement in a submerged anaerobic membrane bioreactor (SAMBR) using powdered activated carbon (PAC)

Akram

Stuckey

2008

Process Biochemistry

150

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“…The bubbleless aeration prevented the possible problem of stripping-loss of acetonitrile in the conventional practices of using bubbled aeration (31) or mechanically stirred aeration (9). The oxygen conversion rate with the bubbleless oxygen supply in the MABR may also approach 100% due to the complete utilization of the oxygen in the biofilm (12). This is in contrast with the oxygen conversion efficiency of 5-25% in the conventionally aerated systems (32).…”

Section: Resultsmentioning

confidence: 99%

Membrane-Aerated Biofilm Reactor for the Treatment of Acetonitrile Wastewater

Liu

Bai

et al. 2008

Environ. Sci. Technol.

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A membrane-aerated biofilm reactor (MABR) was studied for the treatment of wastewater containing acetonitrile, a typical organonitrile compound. The MABR used hydrophobic hollow fiber membranes as the diffusers for bubbleless aeration as well as the carriers for biofilm growth. The objectives were to prevent the stripping-loss of acetonitrile during aeration and to achieve acetonitrile biodegradation plus nitrogen removal simultaneously in a single biolfilm on the membranes. In the MABR, oxygen and substrates were supplied to the biofilm from opposite sides, in contrast to those from the same side in conventional biofilm bioreactors. Operational factors, including surface loading rate and upflow fluid velocity in the bioreactor, on the effect of acetonitrile biodegradation performance were examined. The profiles of dissolved oxygen concentration and microbial activities and populations in the biofilm were investigated. Experimental results showed that, with the adapted microorganisms, removal of acetonitrile at approximately 98.6 and 83.3%, in terms of total organic carbon and total nitrogen, were achieved at a surface loading rate (in terms of membrane surface) of up to 11.29 g acetonitrile/ m 2 · d with an upflow fluid velocity of 12 cm/s and a hydraulic retention time of 30 h. The biofilm on the membranes developed an average thickness of about 1.6 mm in the steady state and consisted of oxic/anoxic/anaerobic zones that provided different functions for acetonitrile degradation, nitrification, and denitrification. The acetonitrile-degrading bacteria in the MABR appeared to secrete more extracellular polymeric substances that enhanced the attachment and development of the biofilm on the membranes. The study demonstrated the potential of using the MABR for the treatment of organonitrile wastewater.

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“…2 it was also noted that the NH 4 + -N removal efficiency decreased along with the increasing of volumetric loading rate and sludge loading rate, accordingly to the results of [20][21][22]. However, a marked difference was noted that from 58.66% (C/N ratio = 17) to 65.79% (C/N ratio = 9.25) of NH 4 + -N removal efficiency could be achieved in the first stage despite the volumetric rate loading and sludge rate loading was high, especially under high influent flow distribution ratios condition, which were opposite to the results of [23][24][25]. However, these were attributed to the presence of simultaneous nitrification and denitrification.…”

Section: The Effect Of Influent Flow Distribution On the Biological Nmentioning

confidence: 99%

Effect of influent flow rate distribution on the performance of step-feed biological nitrogen removal process

Zhu

Peng

Wang

et al. 2007

Chemical Engineering Journal

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The step-feed anoxic/oxic biological nitrogen removal process has been proposed as an attractive alternative for the conventional biological nitrogen removal process for the purpose of enhanced nitrogen removal. For step-feed process, the biological nitrogen removal efficiency is a function of influent flow distribution. In this study, the effects of influent flow rate distribution on the performance of nitrogen removal process were investigated. The effects of influent flow rate distribution on COD, ammonia, total nitrogen removal efficiency, nitrification rate and sludge volume index value were also studied. According to the performance characteristic of the step-feed process, the concept of influent flow rate distribution ratio was firstly introduced. The maximum influent flow distribution ratios (λ max ) under the condition of different influent C/N ratios were determined, respectively, by trial and error method. The experimental results showed that high total nitrogen removal efficiency, higher than 95%, could be achieved under certain influent flow rate distribution ratio without internal nitrate cycle or addition of external carbon source. It was obvious that nitrification rate of each stage under different influent flow distributions decreased along with the decreasing of sludge loading and volume loading in each stage, and the degree of reduction rise gradually with the increasing of influent flow distribution ratio. The sludge volume index value would also increase along with the increase of influent flow distribution ratio.

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The application of membrane biological reactors for the treatment of wastewaters

Cited by 287 publications

References 44 publications

Flux and performance improvement in a submerged anaerobic membrane bioreactor (SAMBR) using powdered activated carbon (PAC)

Flux and performance improvement in a submerged anaerobic membrane bioreactor (SAMBR) using powdered activated carbon (PAC)

Membrane-Aerated Biofilm Reactor for the Treatment of Acetonitrile Wastewater

Effect of influent flow rate distribution on the performance of step-feed biological nitrogen removal process

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