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Preparation method of polyvinylidene fluoride alloy membrane for wastewater treatment during high-salinity food processing

A technology of food processing wastewater and polyvinylidene fluoride, applied in membrane technology, semipermeable membrane separation, chemical instruments and methods, etc., can solve the problems of reduced degradation rate of organic pollutants, biochemical failure, and deterioration of biochemical effects, etc., to achieve Improved antibacterial ability and acid and alkali resistance chemical cleaning ability, strong chemical resistance, and excellent anti-pollution ability

Active Publication Date: 2015-04-29
宁波高新区围海工程技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Salt content is a difficult problem in wastewater treatment. The sewage discharged by pickled products, meat, seafood and dairy products processing enterprises has high salt content, especially for seasonal industries such as pickled products and seafood. The middle salinity is high, and the water quality fluctuates greatly, which has a great impact on the biochemical treatment
High salt content in wastewater will inhibit the growth of microorganisms, reduce the degradation rate of microorganisms on organic pollutants, and deteriorate the biochemical effect, and may even cause biochemical failure, system paralysis, and serious water treatment accidents

Method used

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  • Preparation method of polyvinylidene fluoride alloy membrane for wastewater treatment during high-salinity food processing
  • Preparation method of polyvinylidene fluoride alloy membrane for wastewater treatment during high-salinity food processing
  • Preparation method of polyvinylidene fluoride alloy membrane for wastewater treatment during high-salinity food processing

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preparation example Construction

[0036] (2) Preparation of film-making blend raw materials:

[0037] The mass percent of each component in the film-making blend raw material is:

[0038]

[0039]

[0040] Weigh polyvinylidene fluoride, polyarylene sulfide sulfone, ethylene glycol monomethyl ether, N-methylpyrrolidone and natural capsaicin in proportion, place them in a batching kettle, and stir at a temperature of 150-200°C Dissolving, the stirring time is 20-22 hours, the stirring speed is 100-120 rpm, and the uniformly dissolved film-forming polymer solution is cooled and granulated in the air to obtain the raw material of the blend;

[0041] (3) Extrusion and forming of hollow fiber alloy membrane:

[0042] (3-1) Add the blend raw materials in step (2) into a twin-screw extruder to form a melted blend. The feeding speed of the raw materials is 6-10 kg / hour, and the extruder is divided into two parts along the length of the screw. 6 sections are heated, the temperature is 150-200°C from low to high,...

Embodiment 1

[0077] (1) Pretreatment of polymer materials:

[0078] Dry polyvinylidene fluoride PVDF (molecular weight 370,000) and polyarylene sulfide sulfone PASS (molecular weight 70,000) in a dryer at a drying temperature of 90°C;

[0079] (2) Preparation of film-making blend raw materials:

[0080] The dried polyvinylidene fluoride P 1 , polyarylene sulfide sulfone P 2 , Ethylene glycol monomethyl ether D 1 , N-Methylpyrrolidone D 2 And additive natural capsaicin A weighed by mass percentage, placed in the batching kettle, its mass percentage (wt%) is P 1 :P 2 :D 1 :D 2 : A=35:7:40.2:17:0.8 is the mass percentage, stirred and dissolved at a temperature of 180°C, the stirring time was 20 hours, and the stirring speed was 120 rpm, and the uniformly dissolved film-forming polymer solution was dissolved in the air Medium cooling and granulation to obtain the raw material of the blend;

[0081] (3) Extrusion and forming of hollow fiber membrane:

[0082] (3-1) Add the above-menti...

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Abstract

The invention relates to a preparation method of a polyvinylidene fluoride alloy membrane for wastewater treatment during high-salinity food processing, and belongs to the technical fields of membrane separation and wastewater treatment. The preparation method comprises the following steps of: drying polyvinylidene fluoride and polyarylenesulfidesulfone, weighing the polyvinylidene fluoride, polyarylenesulfidesulfone, ethylene glycol monomethyl ether, N-methyl pyrrolidone and natural cpsicin proportionally, stirring, dissolving, cooling in air and pelleting to obtain a blend material; adding the blend material into a double-screw extruder to form a melt blend which successively passes through a filter and a spinning pump after being extruded by the double-screw extruder and is extruded from a spinneret plate to form a hollow fiber alloy membrane, carrying out aftertreatment on the hollow fiber alloy membrane and drying at a room temperature to obtain the polyvinylidene fluoride alloy membrane. The polyvinylidene fluoride alloy membrane prepared by the method is high in antibacterial ability and acid-alkaline-resistant chemical cleaning ability and can control the membrane pollution when being applied to high-salinity processing wastewater, the chemical tolerance is strong, and the service life of membranes is ensured.

Description

technical field [0001] The invention relates to a method for preparing a polyvinylidene fluoride alloy membrane used for the treatment of high-salt food processing wastewater, in particular to a thermal phase separation method (thermal method for short) to prepare polyvinylidene fluoride (PVDF) and polyarylene The invention relates to a hollow fiber alloy membrane of sulfide sulfone (PASS), which is used for the treatment of high-salt product processing wastewater, and belongs to the technical field of membrane separation and wastewater treatment. Background technique [0002] With the development of industry, industrial wastewater discharge has become an important source of pollution of my country's water environment. Salt content is a difficult problem in wastewater treatment. The sewage discharged by pickled products, meat, seafood and dairy products processing enterprises has high salt content, especially for seasonal industries such as pickled products and seafood. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/08
Inventor 陈翠仙奚韶锋郑晓红
Owner 宁波高新区围海工程技术开发有限公司