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A method and application of improving biofilm hanging film efficiency

A biofilm reactor and biofilm technology, applied in biological treatment devices, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of long time for low-temperature microbial domestication and cultivation, increased processing costs, easy shedding adaptability, etc. , to achieve the effect of easy engineering promotion and use, fast film-hanging speed, and not easy to release the film

Active Publication Date: 2022-06-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The operation of the invention is complicated, the acclimation and cultivation time of low-temperature microorganisms is too long, and a large amount of dosing is required, which increases the processing cost
[0007] Therefore, for the biofilm reactor wastewater treatment process, especially for MABR, in order to solve the key outstanding problems such as difficult formation of biofilm on the surface of the carrier, long film hanging period, easy shedding and narrow adaptability in actual engineering, and to promote For the high-efficiency application of biofilm method in wastewater with difficult film formation, it is of great significance to study an economical film formation method with short film formation time, strong biofilm, strong impact load resistance and good treatment effect.

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Embodiment 1

[0036] The present embodiment provides a method for improving the efficiency of biofilm hanging, the specific contents are as follows:

[0037]The method of the present invention is used to start the co-directional mass transfer biofilm-moving bed biofilm reactor (MBBR) to start the film forming. First, 1600 mL of aerobic activated sludge with a concentration of 2500 mg-VSS / L is inoculated into the MBBR system (effective The volume is 3.2L, semi-soft packing (polypropylene, Φ120, Jiangsu Nantai Environmental Protection Packing Co., Ltd., 30% filling degree), the influent is municipal wastewater, the influent COD concentration is 410mg-COD / L, hydraulic retention The time (HRT) was 6h, the organic load of the influent water of the reactor was 0.41g-COD / (g-VSS·d), the stirring rate in the reactor was controlled at 120rpm, and a microporous aerator was used to supply oxygen to maintain the dissolved oxygen concentration (DO) was 2-4 mg / L (DO fluctuated in the range of 2-4 mg / L dur...

Embodiment 2

[0047] The present embodiment provides a method for improving the efficiency of biofilm hanging, the specific contents are as follows:

[0048] Using the method of the present invention to start the co-directional mass transfer anaerobic biofilm-anaerobic contact oxidation tank to start the film forming, firstly inoculate 6L digester sludge with a concentration of 3500mg-VSS / L into the anaerobic contact oxidation tank (effective volume 4.5m 3 , Elastic filler (YCDT type, Jiangsu Nantai Environmental Protection Packing Co., Ltd., 45% filling degree), the influent is methyl methacrylate MMA chemical wastewater, and the COD concentration of the raw water is 6000mg-COD / L. In this case, the COD concentration of the influent water is 1500mg-COD / L, the hydraulic retention time (HRT) is 6.7h, and the organic load (OLR) of the influent water of the reactor is 0.26g-COD / (g-VSS·d) at this time, and the reaction The stirring rate in the vessel was controlled at 120 rpm, and the pH value ...

Embodiment 3

[0057] The present embodiment provides a method for improving the efficiency of biofilm hanging, the specific contents are as follows:

[0058] Using the method of the present invention to start the anisotropic mass transfer biofilm MABR to start the film, firstly inoculate 500mL of activated sludge in the secondary sedimentation tank with a concentration of 3000mg-VSS / L into the MABR system (the effective volume is 1.54L, and the ratio of membrane components is 1.54L). The surface area is 84.5m 2 / m 3 ), the influent is toxic and refractory acetonitrile (ACN) wastewater, its concentration is 314mg-ACN / L, the corresponding COD concentration is 500mg-COD / L, and the organic load (OLR) of the reactor is 0.32g-COD / ( g-VSS d), the upward flow rate in the reactor is controlled at 2.5cm / s, under the transmembrane oxygen partial pressure of 22-28kPa, the flow rate is 14-17mL-O 2 A flow rate of / min provides bubble-free aeration to maintain liquid phase dissolved oxygen (DO) concentr...

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Abstract

The invention relates to a method and application for improving the efficiency of biofilm film formation. The method includes: inoculating activated sludge into a biofilm reactor, and feeding wastewater so that the organic load of the reactor feed water is not higher than 0.5g- COD / (g‑VSS·d), continuous operation of culture induction until the completion of biofilm formation. Whether this method is aimed at heterotropic mass transfer biofilms or traditional isotropic mass transfer biofilms, it can promote the formation of biofilms, fast film formation, and can meet the requirements of rapid start-up of heterotropic mass transfer biofilm reactors or traditional biofilms. The requirements of the same mass transfer biofilm reactor have a wide range of applications; and this method of film formation is fast, easy to operate, difficult to remove the film, does not need to add any chemicals, does not need to deal with fillers or carriers, and has high wastewater treatment efficiency.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method and application for improving the efficiency of biofilm hanging. Background technique [0002] With the continuous development of sewage treatment technology, the biofilm method has many advantages and technological advancements, such as impact resistance, strong adaptability, high biomass, long generation time, less excess sludge, strong processing capacity, and low power costs. In addition, biofilms have the characteristics of horizontal gene transfer, allowing the spread of adapted metabolic pathways and environmental heterotypic substances among microbial communities, and resisting toxicity inhibition. [0003] Among them, the membrane aerated biofilm reactor (MABR) is a novel treatment system coupled with a gas permeable membrane and a biofilm. The two outstanding features of the reactor are bubble-free aeration and anisotropic mass transfer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34
CPCC02F3/34C02F2203/004C02F2203/006C02F2209/06C02F2209/08C02F2209/10
Inventor 李庭刚
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI