Industrial wastewater reverse osmosis membrane chemical cleaning method

A technology for reverse osmosis membranes and industrial wastewater, applied in chemical instruments and methods, semi-permeable membrane separation, osmosis/dialysis water/sewage treatment, etc., can solve the problems of rapid rise in reverse osmosis pressure difference, high pollutant content, and poor cleaning effect To improve the cleaning effect and efficiency, reduce the cleaning frequency, reduce the cleaning frequency and the amount of cleaning agent used

Active Publication Date: 2018-09-21
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For industrial wastewater reverse osmosis membranes, which mainly treat production wastewater, domestic wastewater and rainwater, the water quality is complex and the content of pollutants is high, which is far from the quality index of surface water or sea water. The reverse osmosis membrane cleaned by the chemical cleaning method of the prior art The reverse osmosis pressure difference rises rapidly during use, and the quality of water after treatment does not meet the standard. The reverse osmosis membrane needs to be cleaned frequently and repeatedly, and the cleaning effect is not good.
Therefore, the chemical cleaning method of the reverse osmosis membrane in the prior art is not suitable for cleaning the reverse osmosis membrane of industrial wastewater, and it is urgent to find a chemical cleaning method suitable for the reverse osmosis membrane of industrial wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The industrial wastewater reverse osmosis membrane chemical cleaning method of this embodiment comprises the following steps:

[0046] Step 1, preparing alkali cleaning agent and pickling agent, the specific operation is:

[0047] (1) Preparation of pickling agents

[0048] First clean the acid cleaning kit with reverse osmosis water and empty it;

[0049] 8m 3 The reverse osmosis product water is injected into the cleaning medicine box, and the water temperature is heated to 35°C;

[0050]Turn on the circulation pump and open the circulation door;

[0051] Dissolve 25kg of citric acid and pour it into the cleaning medicine box. After adding, replenish the cleaning medicine box to 10m 3 Obtaining a citric acid solution of 2% by weight;

[0052] Add ammonia water to adjust the PH value to 2.5~3, set aside

[0053] (2) Alkaline cleaning agent preparation

[0054] First clean the lye cleaning kit with reverse osmosis water and empty it;

[0055] 8m 3 The reverse o...

Embodiment 2

[0104] Using operations similar to each step in Example 1, in the pickling agent in step 1, the percentage content of citric acid is replaced by 1% of 2% in Example 1; in the alkali washing agent in step 1, dodecyl Sodium benzenesulfonate percentage is replaced 0.1% of embodiment 1 by 0.05%, sodium hydroxide percentage is replaced by 0.02% of 0.05% of embodiment 1, sodium polyphosphate percentage is replaced by 0.2% of embodiment 1 0.5%, for chemical cleaning of industrial wastewater reverse osmosis membranes.

Embodiment 3

[0106] Using operations similar to the steps in Example 1, in the pickling agent in step 1, the percentage content of citric acid is replaced by 3% for 2% in Example 1; in the alkali washing agent in step 1, dodecyl Sodium benzenesulfonate percentage is replaced by 0.15% 0.1% of embodiment 1, and sodium hydroxide percentage is replaced by 0.08% 0.05% of embodiment 1, and sodium polyphosphate percentage is replaced by 0.8% of embodiment 1 0.5%, for chemical cleaning of industrial wastewater reverse osmosis membranes.

[0107] After testing, the reverse osmosis membrane chemical cleaning method of Examples 1 to 3 is used to chemically clean the industrial wastewater reverse osmosis membrane, the reverse osmosis effluent water quality and water production rate are improved, the life cycle of the reverse osmosis membrane is extended, and the labor force of employees is reduced. Strength, reducing the maintenance and repair costs of reverse osmosis membrane pressure vessels.

[01...

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Abstract

The invention discloses an industrial wastewater reverse osmosis membrane chemical cleaning method. The method comprises an alkali washing link and an acid pickling link, wherein according to the alkali washing link, the PH value of an alkaline chemical agent is 11-11.5; according to the acid pickling link, the PH value of an acid pickling agent is 2.5-3; the alkaline chemical agent is prepared from sodium hydroxide, sodium dodecyl benzene sulfonate and sodium polyphosphate; the acid pickling agent includes citric acid and ammonium hydroxide. According to the industrial wastewater reverse osmosis membrane chemical cleaning method, the cleaning effect and efficiency of reverse osmosis membrane components are improved, the cleaning frequency of the reverse osmosis membrane and the consumption of a cleaning agent are lowered, the service life of the reverse osmosis membrane is prolonged, and the maintenance cost of a reverse osmosis membrane pressure container is lowered; the method can be applied to treating industrial wastewater with complex water quality and high pollutant content, and wastewater in other fields, and social application and popularization are facilitated.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a chemical cleaning method for industrial wastewater reverse osmosis membranes. Background technique [0002] Reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics made by simulating biological semipermeable membrane, and is the core component of reverse osmosis technology. The principle of reverse osmosis technology is to separate these substances from water based on the fact that other substances cannot pass through the semi-permeable membrane under the action of the osmotic pressure higher than the solution. The structure of reverse osmosis membrane has two types: asymmetric membrane and homogeneous membrane. The currently used membrane materials are mainly cellulose acetate and aromatic polyamides. Its components are hollow fiber, roll, plate and frame and tube. Reverse osmosis membranes are widely used in ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06C02F1/44
CPCB01D65/02B01D2321/162B01D2321/164C02F1/441C02F2303/16
Inventor 曹政苏海清郑树盛姚国将
Owner BAOTOU IRON & STEEL GRP
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