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A flat-plate 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 high energy consumption, easy fouling of treatment equipment, difficulty in large-scale application, etc. problems, to achieve good denitrification performance, easy to replace, and improve the effect of heat shrinkage resistance

Active Publication Date: 2022-07-26
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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  • A flat-plate denitrification membrane for wastewater treatment and preparation method thereof
  • A flat-plate denitrification membrane for wastewater treatment and preparation method thereof

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preparation example Construction

[0032] A preparation method of a flat-plate denitrification membrane for wastewater treatment of the present invention comprises the following steps:

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

[0034] Step 2: The non-woven substrate and the expanded polytetrafluoroethylene film are pre-laminated on top of each other;

[0035] Step 3: Put it into a hot press for high temperature hot pressing. The hot pressing temperature is related to the melting point and hot pressing pressure of the selected polypropylene fibers; during high temperature hot pressing, the hot pressing temperature is...

Embodiment 1

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

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

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

[0042] The formula composition of the mixed fiber slurry: polypropylene fiber accounts for 60wt%, bamboo pulp fiber accounts for 30wt%, and 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) Selection of gas permeable la...

Embodiment 2

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

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

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

[0051] The formula composition of the mixed fiber slurry: polypropylene fiber accounts for 70wt%, bamboo pulp fiber accounts for 15wt%, and carbon fiber accounts for 15wt%. The polypropylene fiber is a bicomponent polyethylene / polypropylene fiber, the melting point of the skin layer of the polypropylene fiber 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 the bleached bamboo pulp fiber; The temperature resistance of ca...

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Abstract

The invention relates to a flat-plate denitrification membrane for wastewater treatment and a preparation method thereof, belonging to the technical field of wastewater treatment; comprising a non-woven substrate layer and a gas permeable layer; the non-woven substrate layer and the gas permeable layer are bonded In one piece; the non-woven base material includes polypropylene fiber, cellulose fiber and carbon fiber; wherein polypropylene fiber accounts for 60-90wt%, cellulose fiber accounts for 5-30wt%, carbon fiber accounts for 5-15wt%, gas permeability The layer is an expanded polytetrafluoroethylene film. The flat-plate denitrification membrane provided by the invention is a submerged flat-plate membrane with a large specific surface area, which can be directly applied in ammonia nitrogen wastewater without adding a pre-filtering device, and is easy to operate, the membrane is easy to replace, and the cleaning and maintenance are convenient. The flat-plate denitrification membrane of the present invention has a unique physical structure, and the physical structure and functionality are highly matched, the denitrification performance is good, and the index parameters such as contact angle, pore diameter and air permeability are reasonable.

Description

technical field [0001] The invention relates to a flat plate 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 significant 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 stripping method, stripping method, struvite method, etc. is the conventional method currently used. It is difficult to popularize and apply on a large scale. [0003] Denitrification membrane technology is a new type of ammoni...

Claims

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Application Information

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Patent Type & Authority Patents(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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