Flat plate type denitrification membrane for wastewater treatment and preparation method thereof

A waste water treatment, flat-plate technology, applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of difficult large-scale application, high energy consumption, and easy fouling of treatment equipment, etc. To solve the problem, achieve the effect of reasonable pore size and air permeability, good denitrification performance, and easy replacement

Active Publication Date: 2020-11-17
CHINA HAISUM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For wastewater with high ammonia nitrogen, the removal or pretreatment of ammonia nitrogen by physical methods such as air stripping, steam stripping, and struvite method is a conventional method currently used, but due to the high energy consumption of these methods and the easy installation of treatment equipment Difficult to popularize and apply on a large scale

Method used

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  • Flat plate type denitrification membrane for wastewater treatment and preparation method thereof
  • Flat plate type denitrification membrane for wastewater treatment and preparation method thereof

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preparation example Construction

[0032] A kind of preparation method of the flat type denitrification membrane that is used for wastewater treatment of the present invention comprises the following steps:

[0033] Step 1: Use the wet papermaking process to make the mixed fiber slurry composed of polypropylene fiber, cellulose fiber and carbon fiber through the paper machine to form the non-woven fabric substrate; in the papermaking process parameters of the non-woven fabric substrate, the paper machine The sizing concentration is set at 0.01-0.5wt%, the drying temperature of the drying cylinder is set at 90-120°C, and the soft calendering temperature is set at 100-130°C.

[0034] Step 2: The non-woven substrate and the expanded polytetrafluoroethylene film are laminated up and down in advance;

[0035] Step 3: Put it into a hot press machine for high-temperature hot-pressing treatment. The hot-pressing temperature is related to the melting point of the selected polypropylene fiber and the hot-pressing pressur...

Embodiment 1

[0039]A flat-type denitrification membrane is composed of a non-woven fabric substrate layer and a gas permeable layer.

[0040] (1) The papermaking process and fiber formula of the non-woven fabric substrate layer:

[0041] The invention provides the papermaking process parameter range of the non-woven fabric base material: the sizing concentration of the paper machine is 0.01wt%, the drying temperature of the drying cylinder is 90 DEG C, and the soft calendering temperature is 100 DEG C.

[0042] The formula composition of the mixed fiber slurry: the polypropylene fiber accounts for 60wt%, the bamboo pulp fiber accounts for 30wt%, and the carbon fiber accounts for 10wt%. The polypropylene fiber is a single-component polypropylene fiber, and the melting point of the polypropylene fiber is 150°C; the beating degree of the bamboo pulp fiber is 30°SR, preferably bleached bamboo pulp fiber; the temperature resistance of the carbon fiber is greater than 300°C.

[0043] (2) Select...

Embodiment 2

[0048] A flat-type denitrification membrane is composed of a non-woven fabric substrate layer and a gas permeable layer.

[0049] (1) The papermaking process and fiber formula of the non-woven fabric substrate layer

[0050] The invention provides the papermaking process parameter range of the non-woven fabric base material: the paper machine sizing concentration is 0.1wt%, the dryer drying temperature is 100 DEG C, and the soft calendering temperature is 120 DEG C.

[0051] The formula composition of the mixed fiber slurry: the polypropylene fiber accounts for 70wt%, the bamboo pulp fiber accounts for 15wt%, and the carbon fiber accounts for 15wt%. The polypropylene fiber is a two-component polyethylene / polypropylene fiber, the melting point of the polypropylene fiber skin layer is 90°C, and the melting point of the fiber body is 170°C; the beating degree of the bamboo pulp fiber is 40°SR, preferably bleached bamboo pulp fiber; The temperature resistance of carbon fiber is g...

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Abstract

The invention relates to a flat plate type denitrification membrane for wastewater treatment and a preparation method thereof, and belongs to the technical field of wastewater treatment. The membranecomprises a non-woven fabric base material layer and a gas permeation layer, wherein the non-woven fabric base material layer and the gas permeation layer are bonded into a whole; the non-woven fabricbase material comprises polypropylene fibers, cellulose fibers and carbon fibers, wherein the polypropylene fiber accounts for 60-90 wt%, the cellulose fiber accounts for 5-30 wt%, the carbon fiber accounts for 5-15 wt%, and the gas permeable layer is an expanded polytetrafluoroethylene film. The flat plate type denitrification membrane provided by the invention is an immersed flat plate membraneand has a large specific surface area, so that the membrane can be directly applied to ammonia-nitrogen wastewater, does not need to be additionally provided with a front filtering device, and is convenient to operate, easy to replace and convenient to clean and overhaul. The flat plate type denitrification membrane has a unique physical structure, the physical structure is highly matched with functionality, the denitrification performance is better, and index parameters such as a contact angle, a pore diameter and air permeability are reasonable.

Description

technical field [0001] The invention relates to a flat-type denitrification membrane for wastewater treatment and a preparation method thereof, belonging to the technical field of wastewater treatment. Background technique [0002] Ammonia nitrogen content can be used as an important pollution indicator of natural water bodies. Excessive discharge of ammonia nitrogen can cause eutrophication of water bodies, and then form black and odorous water bodies, which have a major impact on the aquatic environment. At present, the removal methods of ammonia nitrogen are mainly divided into physical methods and biological methods. For wastewater with high ammonia nitrogen, the removal or pretreatment of ammonia nitrogen by physical methods such as air stripping, steam stripping, and struvite method is a conventional method currently used, but due to the high energy consumption of these methods and the easy installation of treatment equipment It is difficult to popularize and apply it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/06B01D69/12B01D67/00C02F1/58C02F101/16
CPCB01D69/06B01D69/12B01D67/0002C02F1/586C02F2101/16
Inventor 贺磊苟青
Owner CHINA HAISUM ENG
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