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Additive used in a membrane-separation activated sludge process

An activated sludge method and activated sludge technology, applied in the field of additives, can solve the problems of limited filtration period, reduced filtration efficiency, and reduced effective membrane area.

Inactive Publication Date: 2012-07-04
ASAHI KASEI CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the bio-derived polymer or activated sludge metabolized by microorganisms in the activated sludge adheres to the membrane surface, the effective membrane area decreases and the filtration efficiency decreases, so the period during which stable filtration can be performed is limited.

Method used

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  • Additive used in a membrane-separation activated sludge process
  • Additive used in a membrane-separation activated sludge process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] An agar plate medium containing 0.15% of a phosphorus component, 0.04% of a nitrogen component, and 0.001% of a Mg component was prepared. Then, polygalacturonic acid (manufactured by Sigma-Aldrich) was dispersed in the agar solution, and laminated on the above-mentioned medium. Thus, an agar plate medium using polygalacturonic acid as the sole carbon source was prepared.

[0084] Activated sludge, soil, and lake marshes were similarly smeared and inoculated on this medium, and cultured at 28°C for 72 hours to form colonies of molds on an agar plate. The colonies contain at least the fungi of the genus Penicillium and the genus Phalaenopsis.

[0085] Use a platinum inoculation loop to aseptically inoculate the mold produced on the agar plate into 20 mL of a liquid medium with a concentration of 1 g / L polygalacturonic acid as the sole carbon source, and the liquid medium contains a phosphorus component of 0.15 %, 0.04% of the nitrogen component and 0.001% of the Mg com...

Embodiment 2

[0091] An agar plate medium containing 0.15% of a phosphorus component, 0.04% of a nitrogen component, 0.001% of a Mg component, and 1 g / L of xanthan gum (manufactured by Sigma-Aldrich) was prepared. In this way, an agar plate medium using xanthan gum as the sole carbon source was prepared.

[0092]Activated sludge, soil, and lake marshes were similarly smeared and inoculated on this medium, and cultured at 28° C. for 72 hours to form bacterial colonies on an agar plate. The colony contains at least Microbacterium, Paleobacterium, Pseudoxanthomonas, Fluviicola sp., Geobacter, Paenibacillus, and Cohnella species, Brevundimonas species, Hydrogenophages species, Sphingomonas species, Neosphingobacterium species, Sphingomonas species, Sphingosine Bacillus species, Bacteroidetes species, Xanthomonas species, De Vossia species, Stenobacteria species, α-Proteobacteria species and Flexibacteriaceae species.

[0093] The bacterial colony produced on the agar plate was aseptically ino...

Embodiment 3

[0098] An agar plate medium containing 0.15% of a phosphorus component, 0.04% of a nitrogen component, 0.001% of a Mg component, and 1 g / L of hyaluronic acid was prepared. Thus, an agar plate medium using hyaluronic acid (manufactured by Sigma-Aldrich) as a sole carbon source was prepared.

[0099] Activated sludge, soil, and lake marshes were similarly smeared and inoculated on this medium, and cultured at 28° C. for 72 hours to form bacterial colonies on an agar plate. In this colony at least contain Fluviicola sp., Geobacter sp., Paenibacillus sp., Kernella sp., Brevundimonas sp., Hydrophage sp., Sphingosine Monas species, Microbacterium species and Paleobacterium species.

[0100] Bacterial colonies produced on the agar plate were aseptically inoculated with a platinum inoculation loop in 20 mL of a liquid medium with a concentration of 1 g / L of hyaluronic acid as the sole carbon source. The liquid medium contained 0.15% phosphorus and nitrogen 0.04% and 0.001% of the Mg...

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Abstract

In order to provide a means that can process organic wastewater via a membrane-separation activated sludge process that is stable over a long period of time, by reducing the quantity of biological polymers that can cause permeability problems, an additive is provided that is added to the activated sludge when treating organic wastewater via a membrane-separation activated sludge process. Said additive contains microorganisms that decompose polysaccharides.

Description

technical field [0001] The present invention relates to an additive for achieving stable treatment when organic wastewater is treated by a membrane separation activated sludge process. Background technique [0002] As one of the waste water treatment methods, there is a membrane separation activated sludge method in which a membrane cartridge as a separation membrane device is immersed in an activated sludge tank, and solid-liquid separation of activated sludge and a treatment liquid is performed by filtration. In this method, the concentration of activated sludge (Mixed Liquor Suspended Solid: MLSS) is very high at 5,000 to 20,000 mg / L, and solid-liquid separation can be performed. Therefore, there is an advantage that the volume of the activated sludge tank can be reduced, or the reaction time in the activated sludge tank can be shortened. In addition, since the membrane is used for filtration, the final sedimentation tank is not required, and the land area of ​​the treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F1/44C02F3/34C12M1/00C12N1/20
CPCC12N1/20B01D2321/168C12P39/00C02F3/341C02F3/348C02F2303/16C02F2103/32C02F2303/20B01D65/08C12N1/14C02F3/1273C02F3/006C02F3/34Y02W10/10C02F1/44C02F3/12
Inventor 冈村大佑堀克敏
Owner ASAHI KASEI CHEM CORP
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