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Cleaning agent for polyacrylamide contaminated films, and cleaning method thereof

A technology of polyacrylamide and cleaning agent, which is applied in the field of cleaning agent for polyacrylamide polluted membranes, which can solve the problems of difficult cleaning and reuse of filter membranes, shortened service life, secondary pollution of water bodies, etc., and achieves short cleaning time and clean Thorough, surface-structured effect

Active Publication Date: 2019-10-22
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the supernatant after removing the precipitation often contains residual polyacrylamide, which will cause serious pollution in the subsequent membrane separation water treatment process, resulting in a decrease in membrane flux and filtration efficiency, which seriously shortens the service life of the membrane. Easy to cause secondary pollution to water bodies
[0004] Commonly used membranes in the water treatment process are flat microfiltration membranes, flat ultrafiltration membranes, hollow fiber microfiltration membranes, hollow fiber ultrafiltration membranes, reverse osmosis membranes, etc. The membrane materials include polyethersulfone (PES), polysulfone (PS) , polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), ceramic membranes, etc., will be polluted by organic flocculant polyacrylamide (PAM) residues, due to the strong interaction between polyacrylamide and membrane surface materials Binding force, the filter membrane contaminated by polyacrylamide is difficult to clean and reuse

Method used

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  • Cleaning agent for polyacrylamide contaminated films, and cleaning method thereof

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specific Embodiment

[0022] A cleaning agent for polyacrylamide polluted membranes, including a pre-soaking solution before using the membrane and a cleaning solution after using the membrane, the pre-soaking solution is a soluble anionic polymer aqueous solution with a mass concentration of 0.01-10wt%, The cleaning liquid is an aqueous solution containing 0.01-8wt% sodium hydroxide and 0.01-6wt% soluble anionic polymer, and the soluble anionic polymer is sodium alginate or sodium polyacrylate. Its cleaning method comprises the following steps:

[0023] (1) Pre-soaking treatment

[0024] Soak the filter membrane in a soluble anionic polymer solution with a mass concentration of 0.01-10wt% for 3-12 hours to form a layer of soluble pre-protective layer on the surface of the membrane to protect the surface of the membrane from damage by cleaning agents, in which the soluble anionic polymer Sodium alginate or sodium polyacrylate;

[0025] (2) Filtration process

[0026] Take the filter membrane obt...

Embodiment 1

[0030] A PS hollow fiber ultrafiltration membrane with a cut molecular weight of 5 million was selected and soaked in a sodium polyacrylate solution with a mass concentration of 0.1% for 3 hours, and was taken out and applied to the water purification process of the waterworks. After the untreated water is flocculated and precipitated by the water plant, the supernatant will have a little residual polyacrylamide flocculant and other impurities, and the pre-soaked PS hollow fiber ultrafiltration membrane will be used to deeply purify the tap water, that is Continue to filter the supernatant after flocculation and precipitation. The initial pure water flux of the membrane is 350 L / (m 2 *h), for the filtration of tap water supernatant after flocculation and sedimentation, the initial filtration flux is 190 L / (m 2 *h), through the filtration backflush process, after a period of filtration, the equilibrium filtration flux of the membrane is 30 L / (m 2 *h), compared with the initia...

Embodiment 2

[0032] The PES microfiltration flat membrane module with a pore size of 0.1 μm is selected, and the initial pure water flux of the membrane is 700 L / (m 2 *h), soak in sodium alginate solution with a mass concentration of 0.05% for 3 hours, and then filter with a mass concentration of 10 -6 (g / L) polyacrylamide (PAM) aqueous solution. The flux of initial filtration PAM is 250 L / (m 2 *h), after a period of filtration, the equilibrium filtration flux of the membrane is 20 L / (m 2 *h) When compared with the initial filtration PAM flux, the filtration flux decays by about 92%, the filtration is stopped, and the membrane is seriously polluted. The aqueous solution containing 0.3wt% NaOH and 0.06wt% sodium polyacrylate was used to clean the polluted membrane for 60 minutes; after cleaning, the pure water flux of the membrane was 885 L / (m 2 *h), a recovery rate of 126% compared to the initial pure water flux. Soak the above-mentioned PES microfiltration flat membrane module that ha...

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Abstract

The invention discloses a cleaning agent for polyacrylamide contaminated films, and a cleaning method thereof, wherein the cleaning agent comprises a pre-soaking liquid before the use of a membrane, and a cleaning liquid after the use of the membrane, the pre-soaking liquid is a soluble anionic polymer aqueous solution having a mass concentration of 0.01-10 wt%, and the cleaning liquid is an aqueous solution containing 0.01-8 wt% of sodium hydroxide and 0.01-6 wt% of a soluble anionic polymer. The cleaning method comprises: soaking a filtering membrane in a soluble anionic polymer aqueous solution having a mass concentration of 0.01-10 wt% for 3-12 h; taking out the pre-soaked filtering membrane, filtering all kinds of influents containing polyacrylamide residues, and stopping the filtering when the membrane flux is seriously attenuated and the membrane is seriously contaminated; and carrying out circulation flowing rinsing on the contaminated filtering membrane surface for 3-200 min by using a cleaning liquid. According to the present invention, with the cleaning agent and the cleaning method, the cleaning is complete, the flux of the contaminated membrane is restored, and the membrane can be reused.

Description

technical field [0001] The invention relates to a membrane cleaning agent, in particular to a cleaning agent for polyacrylamide polluted membranes and a cleaning method thereof. Background technique [0002] Membrane separation technology is widely used in water treatment, food, medicine, oil exploration and other fields due to its advantages of high separation efficiency, low energy consumption, convenient operation, energy saving, and environmental protection, especially in the field of water treatment in the past 40 years of rapid development , has become a revolutionary water treatment technology in the 21st century. However, the adsorption of membranes with organic matter in water treatment, and the resulting membrane fouling problem is still an important factor limiting the development of membrane separation technology. [0003] Traditional tap water treatment uses processes such as flocculation, sedimentation, and chlorine gas disinfection. This treatment process obv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06
CPCB01D65/02B01D2321/164B01D2321/168
Inventor 张颖陆茵张雪艳卓鸣吕恺史西志
Owner NINGBO UNIV