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Preparation method for composite polysulfone membrane and application of composite polysulfone membrane in treatment of marine aquaculture wastewater

A polysulfone membrane and a technology for its application are applied in the preparation of composite polysulfone membranes and in the field of marine aquaculture wastewater treatment. Improve the mechanical properties of the membrane, inhibit the growth of microbial bacteria, and improve the effect of pollution resistance

Active Publication Date: 2019-08-16
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polysulfone is a highly hydrophobic polymer material with relatively low surface energy, and the hydrophilicity of polysulfone membrane is poor. For the separation, purification and concentration of proteins and biological solutions, hydrophobicity can easily cause proteins on the membrane surface. And the adsorption in the pores, resulting in the decrease of permeation flux and membrane fouling, resulting in the separation of polysulfone membranes in water systems, the separation membrane is easily polluted, and the performance and service life of the membrane are affected

Method used

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  • Preparation method for composite polysulfone membrane and application of composite polysulfone membrane in treatment of marine aquaculture wastewater
  • Preparation method for composite polysulfone membrane and application of composite polysulfone membrane in treatment of marine aquaculture wastewater
  • Preparation method for composite polysulfone membrane and application of composite polysulfone membrane in treatment of marine aquaculture wastewater

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Embodiment 1

[0033] A method for preparing a composite polysulfone membrane, comprising: providing a base membrane, the base membrane is a polysulfone membrane doped by in-situ polymerization of dopamine, and the base membrane is a semi-interpenetrating network structure; and, cross-linking the shell on the base membrane Copper complexes of polysaccharides were used to obtain composite polysulfone membranes, and the above-mentioned crosslinking occurred in a pulsed electric field environment. The base membrane structure of the composite polysulfone membrane limits the movement of the polysulfone main chain, improves the mechanical properties of the composite membrane, enhances the separation performance, pollution resistance and acid and alkali resistance of the composite membrane, and prolongs the service life of the membrane. The up-crosslinked chitosan copper complex has excellent bactericidal effect and slow-release ability, can kill bacteria in wastewater, has long-term bactericidal ef...

Embodiment 2

[0042] The preparation method of composite polysulfone membrane, its concrete steps are as follows:

[0043] 1) Dissolve polysulfone in dimethyl sulfoxide with a solid-liquid ratio of 1:9 g / mL, add dopamine, ethanolamine and methyl jasmonate, which are 57%, 0.33% and 0.17% of polysulfone weight, at 75 Stir and react at ℃ for 9 hours, then centrifugally defoam to form a homogeneous film-forming solution. After casting on a 50cm×50cm glass plate to form a film, immerse in a coagulation bath of potassium hydroxide double-distilled aqueous solution at 35℃ for 28 hours, and replace it every 10 hours. One bath, then take out the film and wash it with double distilled water until neutral, and dry it at 80°C for 20 hours to obtain the base film;

[0044] 2) Dissolve carboxymethyl chitosan in deionized water, adjust the pH to 6.3, add a copper sulfate solution with a volume concentration of 17.5%, react at 35°C for 3 hours, filter, and wash the resulting precipitate to obtain chitosan ...

Embodiment 3

[0048] The difference between this embodiment and embodiment 2 is specifically:

[0049] Step 3) Suspend the chitosan copper complex in 5-8 times the amount of sterilized seawater, and then soak the basement film for preactivation for 30-60min to obtain a cross-linking system. The above-mentioned chitosan copper complex and base The weight ratio of the membrane is 1.15:1. The above-mentioned sterilized seawater contains 0.06mM 6-aminocaproic acid and 0.04mM kresoxim-methyl. The synergistic effect of 6-aminocaproic acid and kresoxim-methyl can be achieved through self-permeation and electric field environment. The systemic effect of the membrane, which gathers inside the membrane pores, can further increase the retention rate of the membrane. At the same time, the membrane pores of the composite membrane are easy to absorb bacteria and macromolecular organic matter in long-term wastewater treatment, resulting in a decrease in the water flow and treatment efficiency of the membra...

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Abstract

The invention provides a preparation method for a composite polysulfone membrane, belonging to the field of composite materials. The preparation method comprises the following steps: providing a basemembrane which is a dopamine in-situ polymerization doped polysulfone membrane and has a semi-interpenetrating type network structure; and crosslinking a chitosan copper complex onto the surface of the above-mention base membrane in a pulsed electric field environment so as to obtain the composite polysulfone membrane, wherein the above-mentioned composite polysulfone membrane has a contact angleof 45 degrees to 80 degrees, a pure water flux of 600 to 1250 L / m2.h and a rejection rate of at least 90%. The preparation method provided by the invention can increase the membrane pore size and water flux, limits membrane structure and mechanical properties from being destroyed due to agglomeration and water absorption of dopamine, reduces the attachment amount of organic substances in membranepores, improves membrane hydrophilicity and the rate of retention, reduces the decay rate of membrane pore flux and the increase coefficient of membrane resistance to improve pollution resistance, andreduces the replacement frequency of the composite membrane to save treatment cost; and the composite polysulfone membrane is used in the fields of marine aquaculture wastewater treatment, marine sterilization, red tide prevention and treatment, etc.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a preparation method of a composite polysulfone membrane and its application in the treatment of marine aquaculture wastewater. Background technique [0002] In recent years, with the rapid development of the aquaculture industry, seawater factory aquaculture has increased dramatically in scale and quantity. If the seawater factory aquaculture wastewater is not discharged after effective treatment, it will inevitably pollute the water bodies of adjacent sea areas. At present, the methods for treating mariculture wastewater mainly include physical methods, chemical methods and biological methods, which mainly remove suspended solids (SS), ammonia nitrogen, chemical oxygen demand (COD), and biological oxygen demand (BOD) in wastewater. In order to meet the requirements of recycling or emission. For the characteristics of mariculture wastewater, these methods all hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/12B01D67/00C02F1/44C02F1/50A01N55/02A01P1/00
CPCA01N55/02B01D69/12B01D69/125B01D71/68B01D2323/12B01D2323/30B01D2323/36B01D2325/30B01D2325/36C02F1/44C02F1/50
Inventor 曾霖
Owner ZHEJIANG OCEAN UNIV
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