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A bio-bead for biofouling control in membrane bioreactor

A technology of membrane bioreactors and reactors, applied in the field of composite materials, can solve problems such as biofouling control of anaerobic membrane bioreactors that have not yet been studied

Active Publication Date: 2019-07-16
NANYANG TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Furthermore, QQ-based biofouling control in anaerobic membrane bioreactors has not been studied

Method used

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  • A bio-bead for biofouling control in membrane bioreactor
  • A bio-bead for biofouling control in membrane bioreactor
  • A bio-bead for biofouling control in membrane bioreactor

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Experimental program
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preparation example Construction

[0160] It will be appreciated that the reaction product of adding the first mixture to the second mixture is a cross-linked polymer composite which is insoluble in the solvent used. Thus, the composite material of step (ii) of the production process can be easily separated from the liquid and then washed and dried - either for storage and / or in the above-mentioned wastewater treatment process, or for the optional coating step .

[0161] According to the requirements of the composite material suitable for use in anaerobic membrane bioreactors, or as suitable for the requirements of composite materials used in aerobic membrane bioreactors, the cross-linked polymer obtained in step (ii) of the above method The composite material can also be subjected to a coating step using a coating material. The method may include immersing the composite material formed in step (ii) of the above preparation method into a solution containing a suitable concentration of the desired coating mater...

Embodiment 1

[0181] Example 1: Optimization of PAC bead composition and volume ratio of beads in the absence of QQ bacteria

[0182] Five independent sets of batch-scale experiments were performed with different bead compositions and bead dosages (volume ratio of beads to reactor), Table 1, to optimize the adsorption of pharmaceutically active compounds (PhACs).

[0183] method

[0184]PAC-alginate beads were prepared by mixing PAC (SAE2, Norit, the Netherlands) with sodium alginate solution (2% w / v) in different ratios (1% w / v or 2% w / v, see Table 1) Mix, and drop CaCl through the nozzle at a rate of 1 mL / min using a peristaltic pump 2 solution (4% w / v); in CaCl 2 After soaking in the solution for 3 h, half of the beads were immersed in a polysulfone solution (8% w / v in N-methyl-2-pyrrolidone) for 10 s, then transferred to Milli-Q water and stored at 4 °C until After use, transfer remaining beads directly to Milli-Q water. Beads without PAC were also prepared as a control.

[0185]...

Embodiment 2

[0200] Embodiment 2: the preparation procedure of QQ-PAC beads

[0201] QQ-PAC beads for biofouling control and trace organic pollutant (TrOC) removal in MBR were prepared according to the following procedure.

[0202] 1. QQ bacteria were isolated from activated sludge and stored at -80°C. QQ bacteria were revived in Luria-Bertani (LB) broth prior to bead preparation. 50 μL of the revived culture (OD > 0.5) was then used to inoculate 5 mL of LB broth and the culture was incubated overnight at 30° C. before use.

[0203] 2. 5 mL of the overnight culture (OD 0.5) was harvested by centrifugation and resuspended in 5 mL of 1X phosphate buffered saline (PBS). 1x PBS with a final concentration of 10 mM PO 4 3 -, 137mM NaCl and 2.7mM KCl. The bacterial suspension was then added to 45 mL of a 2% (w / v; based on a 45 mL solution) sodium alginate solution containing 1% (w / v) PAC (SAE2, Norit, the Netherlands) and stirred to mix. Based on batch adsorption tests as detailed in Exam...

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Abstract

Disclosed herein are composite materials comprising quorum quenching (QQ) bacteria held within a crosslinked polymeric matrix material, such as calcium alginate for reducing and / or preventing membranebiofouling in wastewater treatment. The composite may further comprise a biocompatible absorbent material such as activated carbon and a surface coating of a further polymeric material, such as polysulfone. The composite materials disclosed herein may be particularly suited for use in membrane bioreactors, with particular QQ bacteria consortia being suited to aerobic membrane bioreactors and others to anaerobic membrane bioreactors.

Description

technical field [0001] The present invention relates to composite materials for use in membrane bioreactors to reduce and / or prevent membrane biofouling. Background technique [0002] The listing or discussion of an apparently prior-published document in this specification should not be taken as an acknowledgment that the document is part of the state of the art or is common general knowledge. [0003] Membrane bioreactor (MBR), a combination of biodegradation and membrane filtration, has been widely accepted as an advanced wastewater treatment technology and is gaining popularity in wastewater recycling and reuse worldwide [Desalination.306(2012) 35 -40]. Compared with the traditional activated sludge process, MBR has unique advantages, including high treatment efficiency, low sludge production, small footprint and better effluent quality [Desalination.306(2012) 35-40]. However, membrane fouling (or biofouling) remains a major challenge that severely reduces flux and lead...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F3/28C12R1/01C12R1/40
CPCC02F1/281C02F1/283C02F1/288C02F3/108C02F3/1273C02F3/34C02F2303/20C12N11/02C12N11/14Y02W10/10
Inventor 肖晔远周琰
Owner NANYANG TECH UNIV
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