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Forward permeable membrane cleaning agent and method for applying same

A technology of forward osmosis membrane and cleaning agent, which is applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of FO membrane system fouling, membrane flux decline, membrane fouling, etc. Good stability and enhanced cleaning effect

Inactive Publication Date: 2015-10-07
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The FO membrane pollutants in the OMBR system are mainly high-molecular organic pollutants in the activated sludge, bacteria and algae residues, and microorganisms adsorbed on the surface. Continuous accumulation will cause fouling of the FO membrane system, resulting in a decrease in membrane flux. Operation will cause irreversible membrane fouling and serious losses

Method used

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  • Forward permeable membrane cleaning agent and method for applying same
  • Forward permeable membrane cleaning agent and method for applying same

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: the preparation of cleaning agent

[0034] use figure 1 The configuration process for preparing forward osmosis membrane cleaning agent.

[0035] (1) Dispersant configuration: configure a sodium dodecylbenzenesulfonate solution with a mass fraction of 0.025%;

[0036] (2) Accurately take by weighing a certain amount of silver nanoparticles of 20-40nm, place in the container, add a small amount of above-mentioned dispersant;

[0037] (3) Stir the above solution continuously for 5 minutes under ultrasound (40kHz, 80-100W), and transfer the supernatant to the container after standing for 30 minutes; continue to add a small amount of the above dispersant, stir with ultrasound for 5 minutes, let stand for 30 minutes, transfer Supernatant: Repeat this operation until there is no agglomerated silver nanoparticles after standing still for 30 minutes, then the volume can be adjusted to 0.5-2.0 mg / L silver nanoparticle suspension.

[0038] Surfactant SDBS is very...

Embodiment 2

[0039] Embodiment 2: the preparation of cleaning agent

[0040] The preparation process of forward osmosis membrane cleaning agent is as follows:

[0041](1) Dispersant configuration: configure a sodium dodecylbenzenesulfonate solution with a mass fraction of 0.05%;

[0042] (2) Accurately take by weighing a certain amount of silver nanoparticles of 20-40nm, place in the container, add a small amount of above-mentioned dispersant;

[0043] (3) Continuously stir the above solution under ultrasonic waves, then let it stand still, and transfer the supernatant; continue to add a small amount of the above-mentioned dispersant, stir it with ultrasonic waves, let it stand, and transfer the supernatant; repeat this operation until no The agglomerated silver nanoparticles can be fixed to volume and configured into a 0.5-2.0mg / L silver nanoparticle suspension.

[0044] The preparation method of the present invention adopts the method of multiple times of ultrasonication, standing stil...

Embodiment 3

[0045] Embodiment 3: the application of cleaning agent

[0046] Get the heavily polluted forward osmosis membrane in the OMBR reactor, a large amount of organic and microbial pollutants are deposited on the surface of the polluted forward osmosis membrane, and its pure water flux is only 3.62LMH (drawing solution 1.0MNaCl, cross-flow velocity 0.13m / s, measured at a temperature of 26°C). First, replace the drawing solution with deionized water, and perform a simple backwash. After continuous flushing for 1 hour, the membrane flux returns to 6.3LMH; then, replace the deionized water with the cleaning agent - 1.0mg / L silver nanometer The particle suspension (containing 0.05% sodium dodecylbenzenesulfonate), after continuous operation for 1 hour, the flux can be recovered to 8.57LMH, which is 84.62% of the new membrane flux.

[0047] Under the same conditions, using 0.5mg / L silver nanoparticle suspension (containing 0.025% sodium dodecylbenzenesulfonate) as a cleaning agent, aft...

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Abstract

The invention discloses a forward permeable membrane cleaning agent and a method for applying the same, and belongs to the technical field of water treatment agents. The forward permeable membrane cleaning agent comprises 0.5-2.0mg / L of silver nano-particle suspension liquid which is dispersed in 0.025%-0.05% of sodium dodecyl benzene sulfonate. The forward permeable membrane cleaning agent and the method have the advantages that the forward permeable membrane cleaning agent is wide in application range and can be used as a forward permeable membrane online reverse cleaning agent instead of absorbing liquid for forward permeable membrane bioreactors; a cleaning process is applicable to forward permeable membranes made of various materials, trace silver nano-particles and partial silver ions released by the silver nano-particles can be transmitted through membrane pores along with reverse washing water under a reverse cleaning effect of the water, accordingly, sterilization effects can be realized for organisms on contamination layers deposited on the surfaces of the membranes, the organisms on the surfaces of the membranes can be inactivated, adsorption effects of the organisms on the surfaces of the membranes can be deteriorated, the organic biological contamination layers on the surfaces of the forward permeable membranes can be effectively removed, and the forward permeable membrane cleaning agent is free of damage to the forward permeable membranes and can be reused; the forward permeable membrane cleaning agent and the method are scientific and reasonable in design and have an important significance on solving the difficult problem of contamination of existing forward permeable membranes and expanding application of the silver nano-particles and the forward permeable membranes.

Description

technical field [0001] The invention relates to a forward osmosis membrane cleaning agent and an application method thereof, belonging to the technical field of water treatment agents. Background technique [0002] Forward Osmosis (FO) membrane separation process is an emerging membrane separation technology, which produces clean effluent through the osmotic pressure difference of the solution on both sides of the FO membrane without external pressure. Forward osmosis membrane bioreactor (Forward osmotic membrane bioreactor, OMBR) is a sewage treatment system that integrates the retention of FO membranes and the degradation of activated sludge. Compared with traditional membrane treatment technologies, it has the following advantages: (1) due to Forward osmosis works under low pressure or no external pressure, and the energy consumption of the process and the degree of membrane pollution are greatly reduced; (2) The semi-permeable membrane only allows water molecules to pass...

Claims

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Application Information

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IPC IPC(8): B01D65/06B01D65/02
Inventor 王新华赵艳晓李秀芬
Owner JIANGNAN UNIV
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