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
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[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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