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Cleaning technology for silica scales of reverse osmosis membrane

A technology of reverse osmosis membrane and reverse osmosis, which is used in reverse osmosis, semi-permeable membrane separation, osmosis/dialysis water/sewage treatment and other directions to achieve fast and efficient flux, reduced cleaning water volume, and strong pertinence.

Inactive Publication Date: 2018-12-18
SHANGHAI EMPEROR OF CLEANING HI TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is mainly aimed at the problem that the existing reverse osmosis anti-silicon scale technology cannot stably control the operation process and the reverse osmosis membrane still has silicon scale formation, and proposes to use specific chemical agents to change the composition or properties of the pollutants to achieve anti-scaling. Chemical cleaning of the reverse osmosis membrane system with special silica scale, so that the membrane elements can restore their original performance requirements

Method used

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  • Cleaning technology for silica scales of reverse osmosis membrane
  • Cleaning technology for silica scales of reverse osmosis membrane
  • Cleaning technology for silica scales of reverse osmosis membrane

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Embodiment

[0065] The specific plan is: use the existing cleaning system of the reverse osmosis membrane device, use RO product water to prepare the total amount of cleaning solution according to the scale of the device, and use RO product water after acid-base pH adjustment for washing during cleaning. The first step is to adjust the amount of alkali (sodium hydroxide) added to the cleaning solution to adjust the pH value to 9-11, then add 1% EDTA, rinse for 2-3 hours, then stop the alkali washing, and continue to rinse to the required pH for operation; The second step is to adjust the amount of acid (hydrochloric acid) to adjust the pH value to 3-5, rinse for 2-3 hours, then stop pickling, and continue to rinse to the required pH for operation; the third step uses 2-5% fluorine-containing solution to The membrane system is cleaned circularly for 2 to 4 hours. After cleaning, continue to flush to the required pH for operation and operate normally. In this cleaning scheme, the amount of ...

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Abstract

The invention relates to a cleaning technology for silica scales of a reverse osmosis membrane. The technology comprises the following steps: (a) cleaning oil and microbe contaminations on a contaminated reverse osmosis membrane by using a high-pH cleaning solution; (b) cleaning inorganic scale or metal oxide contaminations on the contaminated reverse osmosis membrane by using a low pH cleaning solution; and (c) preparing a silica scale cleaning solution from a specific chemical agent, and cleaning the silica scales on the reverse osmosis membrane to make the reverse osmosis membrane recover the original performances. The specific chemical agent is used to change the composition or properties of contaminants to achieve chemical cleaning of the reverse osmosis membrane system with special silica scales, so the original performances of the membrane element are recovered. The cleaning technology has the advantages of simplicity in operation, safety in running, wideness in promotion, stable cleaning effect, and prolongation of the service life of the reverse osmosis membrane.

Description

technical field [0001] The invention belongs to the technical field of petroleum industry environmental protection and energy-saving water treatment, and in particular relates to a cleaning process for reverse osmosis membranes with silica scale. Background technique [0002] In recent years, with the expansion of the scale of refining and chemical equipment and the current level of refining and chemical technology, the water consumption of enterprises has increased dramatically. In the face of areas with poor water resources, large and medium-sized refining and chemical enterprises have to implement sewage reuse treatment projects, and reverse osmosis membrane technology, as a new separation technology, is one of the most widely used technologies for refining and chemical wastewater treatment. However, in the process of sewage reuse treatment, due to the high content of calcium and magnesium ions forming hardness and obvious harm, more attention has been paid to its treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44B01D65/02B01D61/10
CPCB01D61/10B01D65/02C02F1/441
Inventor 王炜
Owner SHANGHAI EMPEROR OF CLEANING HI TECH
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