Preparation method and application method of membrane pollution inhibitor for membrane bioreactor

A technology of membrane bioreactor and application method, which is applied in the field of preparation of membrane fouling inhibitors for membrane bioreactors, can solve the problems of complex enzyme purification process, high cost, poor stability, etc., and achieve the solution of inhibitor loss and low cost , the effect of reducing the concentration

Active Publication Date: 2015-09-16
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many problems in these studies, such as complex enzyme purification process, high cost, poor stability, etc.
The literature (Journal of Membrane Science, 2012, 412:130-136) explored a new method to coat QQ bacteria with microporous membranes to slow down membrane fouling. However, this microorganism-tube bundle can only degrade the solubility signal diffused into the tube bundle. molecule, no quenching effect on signaling molecules that do not diffuse into microbe-tubules

Method used

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  • Preparation method and application method of membrane pollution inhibitor for membrane bioreactor

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Experimental program
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Effect test

Embodiment 1

[0029] The structure of the reactor (CMBR) used in the control group is exactly the same as that of the reactor (HMBR) added with membrane fouling inhibitor. The effective volume of the reactor is 20L, and the fluctuation range of sludge concentration is 5-7mg / L. The hydraulic retention time (HRT) and sludge retention time (SRT) of the two sets of reactors were 6h and 30d, respectively. Domestic sewage influent chemical oxygen demand (COD cr ) is 300-500mg / L.

[0030] (1) First prepare 600mL of sodium alginate solution with a mass fraction of 2%, mix well; then prepare 250mL of allicin solution with a mass fraction of 30%, mix well for later use; finally prepare brominated furanone with a mass fraction of 5% Ethanol solution 150mL, mix well and set aside;

[0031] (2) Mix the prepared allicin solution evenly with the ethanol solution containing brominated furanone, then mix evenly with the sodium alginate solution, and leave to age for 2 hours;

[0032] (3) With a peristalt...

Embodiment 2

[0036] In this embodiment, the structure of the two sets of reactors used is the same as that of Embodiment 1. The fluctuating range of sludge concentration is 8-11g / L, and the operating parameters in the stable stage: HRT is 8h, SRT is 30d, domestic sewage influent COD cr It is 370mg / L~550mg / L.

[0037] (1) First prepare 600 mL of sodium alginate solution with a mass fraction of 3%, mix well; then prepare 250 mL of allicin solution with a mass fraction of 40%, mix well for later use; finally prepare brominated furanone with a mass fraction of 7% Ethanol solution 150mL, mix well and set aside;

[0038] (2) Mix the prepared allicin solution with the ethanol solution of furanone bromide evenly, then mix with the sodium alginate solution evenly, and let stand and age for 3h;

[0039] (3) With a peristaltic pump, the mixed solution of the three solutions after the aging is sucked into the calcium chloride solution with a mass fraction of 2% through a nozzle with an aperture of 2...

Embodiment 3

[0043] In this embodiment, the structure of the two sets of reactors used and the water quality of the domestic sewage are the same as those in Embodiment 2. The fluctuating range of sludge concentration is 10-15g / L, and the operating parameters are: HRT is 8h, SRT is 20d.

[0044] (1) First prepare 600mL of sodium alginate solution with a mass fraction of 4%, mix uniformly; then prepare 250mL of allicin solution with a mass fraction of 45%, mix well for later use; finally prepare brominated furanone with a mass fraction of 8% Ethanol solution 150mL, mix well and set aside;

[0045] (2) Mix the prepared allicin solution evenly with the ethanol solution containing brominated furanone, then mix evenly with the sodium alginate solution, and leave to age for 4 hours;

[0046] (3) With a peristaltic pump, the mixed solution of the three solutions after the aging is sucked into the calcium chloride solution with a mass fraction of 2% through a nozzle with an aperture of 2 mm, and t...

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Abstract

The invention discloses a preparation method and an application method of a membrane pollution inhibitor for a membrane bioreactor. The preparation comprises the following steps: respectively preparing a sodium alga acid solution, an allicin solution and a brominated furanone ethanol solution of different mass percents; dripping the solution into a calcium chloride solution, forming microspheres containing the membrane pollution inhibitor, performing suction filtration, and performing freeze drying. During specific application, the microspheres subjected to freeze drying are added into the membrane bioreactor at a time, wherein the mass concentration ratio of the addition amount to sludge concentration is 1:(50-70). According to the membrane pollution inhibitor, communication among dominant signal molecules in the membrane bioreactor can be effectively blocked, so that target genes cannot be expressed, and biological membrane formation is inhibited. The concentration of microbial metabolism products in the reactor can be obviously reduced, the membrane pollution rate is obviously reduced, the microbial growth rate is reduced, the activated sludge concentration is reduced, and the sludge treatment cost is reduced. Moreover, the preparation method and application method of the membrane pollution inhibitor have the advantages of simplicity in operation, low cost, reliability in operation, zero secondary pollution and the like.

Description

technical field [0001] The invention belongs to the technology of treating sewage by adopting biochemical methods, and in particular relates to a method for preparing and applying an inhibitor of membrane fouling of a membrane bioreactor. Background technique [0002] Membrane bioreactor (MBR) technology is a new process combining microfiltration membrane (MF) or ultrafiltration membrane (UF) filtration technology with traditional activated sludge process (CAS). It has the advantages of small footprint, good effluent quality and automation. High degree and many other advantages. However, the membrane fouling phenomenon caused by the interaction between the membrane and the sludge mixture during the filtration process reduces the membrane flux and thus limits the further extensive application of the MBR process. How to slow down membrane fouling and stabilize membrane flux is a key problem that researchers at home and abroad in the MBR process urgently need to solve. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12B01D65/08
CPCY02W10/10
Inventor 张海丰王嘉雍于海欢王斌
Owner NORTHEAST DIANLI UNIVERSITY
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