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Method for cleaning heavy oil sludge-polluted membrane module

A membrane module and heavy oil technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficult effects and difficult effects of membrane modules, and achieve obvious effects, save manpower and material resources, and save chemicals. Effect

Active Publication Date: 2011-08-10
TIANJIN TISUN ITASCA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] For MBR membrane modules polluted by heavy oil sludge, it is difficult to achieve ideal results by using traditional online water cleaning and online chemical cleaning methods; and off-line chemical cleaning requires a large amount of labor and chemicals, and requires on-site equipment. Off-line chemical cleaning has certain limitations for projects with large processing scale and no cleaning conditions on site
In addition, it is difficult to achieve ideal results by using conventional chemicals to soak and clean membrane modules polluted by heavy oil sludge.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) First lower the liquid level of the membrane tank to just expose the membrane module;

[0037](2) Continuously inject clean water into the membrane modules through the backwashing system. The injection volume is 100L of clean water per membrane, and the operating pressure is between 0.1mpa. At the same time, the membrane modules are fully aerated at high intensity, and the air-water ratio is maintained at 30: 1, for 3 hours;

[0038] (3) Inject 300ppm acidic hydrogen peroxide solution into the membrane module through the backwashing system for backwashing. Aeration, the air-water ratio is maintained at 45:1, and each unit is alternately aerated for 4 hours. After the aeration is stopped, the sludge falling off the membrane is then treated;

[0039] (4) repeat the step (3) of the acidic hydrogen peroxide solution backwashing step;

[0040] (5) Then repeat the clean water backwashing step of step (2);

[0041] (6) Then inject a sodium hypochlorite solution with a c...

Embodiment 2

[0044] (1) First lower the liquid level of the membrane tank to just expose the membrane module;

[0045] (2) Continuously inject clean water into the membrane modules through the backwashing system. The injection volume is 100L of clean water per membrane, and the operating pressure is between 0.2mpa. At the same time, fully and high-intensity aeration is performed on the membrane modules, and the air-water ratio is maintained at 50: 1, for 6 hours;

[0046] (3) Inject 500ppm acidic hydrogen peroxide solution into the membrane module for backwashing through the backwashing system. Aeration, the air-water ratio is maintained at 75:1, and each unit is alternately aerated for 6 hours. After the aeration is stopped, the sludge falling off the membrane is then treated;

[0047] (4) repeat the step (3) of the acidic hydrogen peroxide solution backwashing step;

[0048] (5) Then repeat the clean water backwashing step of step (2);

[0049] (6) Then inject a sodium hypochlorite so...

Embodiment 3

[0051] Embodiment 3 practical application

[0052] MBR (Membrane Bioreactor) technology is used in the oil production sewage treatment system of a crude oil plant, and the hollow fiber curtain membrane made of PP (polypropylene) is used. A total of 22 groups of membrane modules are used, each group contains 132 pieces of curtain membrane, and the area of ​​each membrane is 12m 2 / piece, the daily water treatment capacity is 2500 tons. Due to some reasons, a production accident occurred, and the on-site monitoring was not in place, resulting in a large amount of wastewater containing heavy oil and surfactants entering the MBR tank. This kind of wastewater is difficult to degrade. After being combined with activated sludge, it forms a very viscous, Sludge-like substance with poor hydrophilicity. After this sludge-like substance pollutes the membrane, the flux of the membrane drops sharply. Under the condition of negative pressure -0.02mPa, the flux operation value is changed ...

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Abstract

The invention discloses a method for cleaning a heavy oil sludge-polluted membrane module, which realizes the cleaning for the heavy oil sludge-polluted membrane module by stepwise combination of online backwash with clean water, acidic hydrogen peroxide solution with the concentration of 300ppm to 500ppm and sodium hypochlorite solution with the concentration of 300ppm to 500ppm, and high strength aeration. After the membrane module is cleaned, the water flux of the membrane reaches 130m3 / h under negative pressure of -0.02mPa according to one-week real-time monitoring, thus the water flux restores to the level as much as 92.86% of initial flux so as to meet the demand of the design flux of 125m3 / h required by normal operation of system. The method for cleaning heavy oil sludge-polluted curtain membrane restores membrane flux effectively and simultaneously saves a great amount of manpower and resources, besides, the online cleaning in the method of the invention is characterized by directly adding agents to the heavily-polluted area of the membrane, so the agents are strongly targeted and high in utilization rate, and compared with offline cleaning in the manner of immersing the membrane module in a cleaning pool, the method saves plenty of agents, is more remarkable in effect and has superior market prospect.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a method for cleaning PP (polypropylene) hollow fiber curtain membrane modules polluted by heavy oil sludge. Method for cleaning membrane components. Background technique [0002] Membrane separation technology is a separation technology widely used in the separation, concentration and purification of solutions or gaseous substances. The membrane wall is densely covered with micropores, the stock solution passes through one side of the membrane under a certain pressure, the solvent and small molecular solutes pass through the membrane wall to become the filtrate, and the macromolecular solutes are retained by the membrane to achieve the purpose of material separation and concentration. The use of membrane technology to separate pollutants from water molecules can recycle precious water resources. Membrane Bio-Reactor (MBR) is a new type of wastewater treatment system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06
Inventor 刘沐之张霞王萍阳震
Owner TIANJIN TISUN ITASCA TECH
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