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Pressurizing dissolved air flotation cleaning method for organic pollutant on reverse osmosis membrane

A technology of organic pollutants and reverse osmosis membranes, which is applied in the field of membrane separation in chemical engineering science, can solve the problems of increased operating costs of reverse osmosis membranes, high cost of cleaning chemicals, damage to reverse osmosis membranes, etc., to reduce the cost of membrane cleaning chemicals, Effects of reducing organic pollution and increasing air bubble adhesion

Inactive Publication Date: 2009-04-08
SHANGHAI ZIQUAN BEVERAGE INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods generally have a better cleaning effect when the cleaning concentration is high and the pH value is high. On the one hand, the cost of cleaning chemicals is high, resulting in an increase in the operating cost of the reverse osmosis membrane; permeable membrane damage

Method used

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  • Pressurizing dissolved air flotation cleaning method for organic pollutant on reverse osmosis membrane
  • Pressurizing dissolved air flotation cleaning method for organic pollutant on reverse osmosis membrane
  • Pressurizing dissolved air flotation cleaning method for organic pollutant on reverse osmosis membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The whole system is divided into 2 sub-circulation systems, such as figure 1 Shown: One is a reverse osmosis membrane system, used for membrane fouling and membrane cleaning; the other is a gas-liquid mixing system, which generates a gas-liquid mixed cleaning solution through a pressurized dissolved air flotation device. Both systems share a raw water tank.

[0024] In the reverse osmosis membrane system, a low-pressure flat reverse osmosis membrane is used. The flat membrane is taken from the TW30-1812 membrane of Beijing Ande Membrane Separation Company, and the membrane area is 1.39×10 -2 m 2 . The reverse osmosis concentrate port is equipped with regulating valves, flow meters and heat exchangers, and all the concentrate from the reverse osmosis membrane is returned to the original water tank for circulation. Install a small-range flowmeter at the permeate port of the reverse osmosis membrane, and return all the permeate to the original water tank for circulation...

Embodiment 2

[0034] In this embodiment, the type of cleaning solution is changed to EDTA for testing. The system is equipped with figure 1 shown.

[0035] Activated carbon was used to filter tap water to test the initial water production Jv0 value of the reverse osmosis membrane before organic pollution occurred. During the test, the temperature was kept constant at 20°C and the pressure was kept constant at 1Mpa.

[0036] Weigh 0.8g humic acid powder, dissolve in ultrapure water, add concentrated hydrochloric acid solution to adjust pH=1, stir for one hour, make it fully mixed, then use NaOH solution to adjust pH=13, stir for one hour, After standing for two hours, filter twice with quantitative filter paper, filter out the undissolved humic acid sediment, pour the prepared humic acid solution into the original water tank, and add 8.88g CaCl 2 and 32.8gNaCl in the original water tank, adjust the pH to 4 with concentrated hydrochloric acid, prepare 10L pollution solution, and carry out t...

Embodiment 3

[0043] In this embodiment, the influence of the pH value of the cleaning solution on the cleaning efficiency is tested. The system is equipped with figure 1 shown.

[0044] Activated carbon was used to filter tap water to test the initial water production Jv0 value of the reverse osmosis membrane before organic pollution occurred. During the test, the temperature was kept constant at 20°C and the pressure was kept constant at 1Mpa.

[0045] Weigh 0.4g humic acid powder, dissolve in ultrapure water, add concentrated hydrochloric acid solution to adjust pH=1, stir for one hour, make it fully mixed, then use NaOH solution to adjust pH=13, stir for one hour, After standing for two hours, filter twice with quantitative filter paper, filter out the undissolved humic acid sediment, pour the prepared humic acid solution into the original water tank, and add 4.44g CaCl 2 and 16.4g NaCl in the original water tank, adjust the pH to 4 with concentrated hydrochloric acid, prepare 10L pol...

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Abstract

The invention relates to a pressurized dissolved air flotation cleaning method for organic pollutant on a reverse osmosis membrane, which belongs to the technical field of membrane separation in the chemical engineering science. The pressurized dissolved air flotation cleaning method adopts a high-pressure pump to send a cleaning liquid into a pressurized dissolved air flotation device from a raw water tank; the cleaning liquid is mixed with air which is then dissolved in the cleaning liquid; after the pressure is reached, an outlet valve is opened and the air is released into microbubbles in the state of dissolution; the bubbles are fully mixed with the cleaning liquid, and mixed gas-liquid mixture is sent into the raw water tank for circulation; generated gas-liquid mixed cleaning liquid is inputted into a reverse osmosis membrane machine from the other high-pressure pump, so as to clean the organic pollutant on the membrane; and the cleaning liquid is circulated into the raw water tank. The pressurized dissolved air flotation cleaning method achieves the cleaning efficiency by recording of the time variation of parameters of the cleaning liquid and the variation of the permeation flux of standard water before and after the reverse osmosis membrane is polluted. The pressurized dissolved air flotation cleaning method obviously improves the cleaning efficiency of the organic pollutant of the reverse osmosis membrane, prolongs the service life of the membrane, and reduces the cost of a medicine for cleaning the membrane.

Description

technical field [0001] The invention relates to a pressurized dissolved air flotation cleaning method for organic pollutants on a reverse osmosis membrane, in particular to a method of using a pressurized dissolved air flotation device to produce a gas-liquid mixture containing countless microbubbles on the reverse osmosis membrane. The method of intensive cleaning of organic pollutants. The invention belongs to the technical field of membrane separation in chemical engineering science. Background technique [0002] Reverse osmosis has been widely used in the fields of ultra-pure water preparation, wastewater treatment, drinking water, beverage and chemical production in the electronics industry due to its outstanding advantages such as convenient operation, small system footprint, low energy consumption, stable product water quality and economical operating costs. . With the improvement of membrane technology and the increasing competitiveness of reverse osmosis technolog...

Claims

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Application Information

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IPC IPC(8): B01D65/02
Inventor 杨庆峰员文权
Owner SHANGHAI ZIQUAN BEVERAGE INDUSTRY CO LTD
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