CN114011247A - Method for cleaning and maintaining reclaimed water reuse membrane in PTA (pure terephthalic acid) industry - Google Patents
Method for cleaning and maintaining reclaimed water reuse membrane in PTA (pure terephthalic acid) industry Download PDFInfo
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- CN114011247A CN114011247A CN202111369795.XA CN202111369795A CN114011247A CN 114011247 A CN114011247 A CN 114011247A CN 202111369795 A CN202111369795 A CN 202111369795A CN 114011247 A CN114011247 A CN 114011247A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
Abstract
The invention relates to a method for cleaning and maintaining a reclaimed water reuse membrane in PTA industry, which comprises the following steps: s1, selecting a cleaning method according to the water quality and the pollution condition; s2, preparing a cleaning agent; s3, flushing the system; s4, acid washing, discharging and washing; s5, alkali washing, discharging and washing; s6, cleaning the membrane system, wherein the circulation time of the membrane system is not less than 2 hours by using an acidic cleaning agent, and the circulation time of the membrane system is not less than 2 hours by using an alkaline cleaning agent; s7, system flushing and throwing: after the first section of membrane and the second section of membrane are cleaned, closing the cleaning fluid inlet and outlet valves; opening a flushing drain door, adopting a reverse osmosis low-pressure flushing mode, and flushing reverse osmosis; until the pH of the flushing water and the inlet water are close to or equal to each other; reverse osmosis is ready for use. The invention cleans and maintains the membrane, removes substances such as accumulated sediments, bacteria breeding and the like on the surface of the membrane, and avoids the phenomena of pressure drop increase, flux reduction, salt permeability increase and the like of the membrane.
Description
Technical Field
The invention relates to the field of water treatment, in particular to a method for cleaning and maintaining a water reuse membrane in PTA industry.
Background
During the operation of the reclaimed water reverse osmosis system, sediment, bacteria and other substances are gradually accumulated on the surface of the membrane, so that the phenomena of pressure drop increase, flux reduction, salt permeability increase and the like of the membrane are caused. The reverse osmosis system is periodically subjected to a cleaning operation.
Disclosure of Invention
The invention aims to provide a method for cleaning and maintaining a water reuse membrane in PTA industry.
The invention realizes the purpose through the following technical scheme: a method for cleaning and maintaining a water reuse membrane in PTA industry comprises the following steps:
s1, selecting a cleaning method according to the water quality and the pollution condition;
s2, preparing a cleaning agent;
s3, flushing the system;
s4, acid washing, discharging and washing;
s5, alkali washing, discharging and washing;
s6, cleaning the membrane system, wherein the circulation time of the membrane system is not less than 2 hours by using an acidic cleaning agent, and the circulation time of the membrane system is not less than 2 hours by using an alkaline cleaning agent;
s7, system flushing and throwing: after the first section of membrane and the second section of membrane are cleaned, closing the cleaning fluid inlet and outlet valves; opening a flushing drain door, adopting a reverse osmosis low-pressure flushing mode, and flushing reverse osmosis; until the pH of the flushing water and the inlet water are close to or equal to each other; reverse osmosis is ready for use.
Further, the pickling is circulated through a low flow feed circulation 1/3 flow, soaking, high flow.
Further, the alkali washing is circulated through a low flow medicine feeding circulation 1/3 flow, soaking and high flow.
Further, the cleaning flow rate was set to 9m3/h。
Further, the washing should not be below 15 ℃.
Further, the discharge time is not less than 10 min.
Compared with the prior art, the method for cleaning and maintaining the reclaimed water reuse membrane in the PTA industry has the beneficial effects that: the membrane is cleaned and maintained, substances such as accumulated sediments, breeding bacteria and the like on the surface of the membrane are removed, and the phenomena of pressure drop increase, flux reduction, salt permeability increase and the like of the membrane are avoided.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
A method for cleaning and maintaining a water reuse membrane in PTA industry comprises the following steps:
s1, selecting a cleaning method according to the water quality and the pollution condition;
s2, preparing a cleaning agent;
s3, flushing the system;
s4, acid washing, discharging and washing; acid washing is carried out through low flow medicine feeding circulation 1/3 flow, soaking and high flow circulation;
s5, alkali washing, discharging and washing; alkali washing is carried out through low-flow medicine feeding circulation 1/3 flow, soaking and high-flow circulation;
s6, cleaning the membrane system, wherein the circulation time of the membrane system is not less than 2 hours by using an acidic cleaning agent, and the circulation time of the membrane system is not less than 2 hours by using an alkaline cleaning agent;
s7, system flushing and throwing: after the first section of membrane and the second section of membrane are cleaned, closing the cleaning fluid inlet and outlet valves; opening a flushing drain door, adopting a reverse osmosis low-pressure flushing mode, and flushing reverse osmosis; until the pH of the flushing water and the inlet water are close to or equal to each other; reverse osmosis is ready for use.
Basic cleaning requirements and points are as follows:
1) the cleaning must be carried out according to the chosen formulation and at the specified temperature.
2) Cleaning flow rate: 8in of the membrane element, the flow rate can be 9m3(i.e., purge flow 9 times the number of first stage pressure vessel arrangements). The pressure vessel must be the minimum pressure to achieve the above-mentioned flow rates, but the pressure drop across any pressure vessel single membrane element must not exceed 60 psi.
3) Prepare the cleaning system, check the cleaning tank, hose, cartridge filter. If necessary, the tank and hose are cleaned and a new cartridge filter is installed.
4) Preparing a cleaning solution: the pH value of the cleaning solution should be in accordance with the requirements of the cleaning agent. The temperature should generally not be below 15 ℃ to avoid precipitation of the chemical at low temperatures.
5) During cleaning, according to the specific condition of the system, the medicine is fed in a low-flow mode (1/3 circulating pump flow), the water is circulated in the water inlet direction for 10-30 minutes, the soaking is carried out for 10-30 minutes, the pH value of the cleaning solution is measured, and if the pH value changes by 0.5, acid is added or alkali is adjusted. If the cleaning solution is too cloudy, it needs to be reconstituted. The cycle and soak times can be increased depending on the system contaminants and the degree of contamination.
6) Soaking: the soaking time is determined according to the fouling condition of the reverse osmosis membrane, and a discontinuous circulation mode can be adopted by using lower flow.
7) And (3) circulating cleaning: note the flow requirements, if contamination is severe, please drain the initial reflux (approximately 15% of the volume of the purge tank) to prevent the contaminants from re-attaching to the membrane surface.
8) Washing: rinsing with fresh water or clear water. When more than two kinds of cleaning solutions are adopted for cleaning, the stock solution is cleaned by washing and then the cleaning is started by using the other kind of liquid medicine.
9) After the device starts to operate after cleaning, the initial effluent is drained, and the drainage time is not less than 10 min.
The invention cleans and maintains the membrane, removes substances such as accumulated sediments, bacteria breeding and the like on the surface of the membrane, and avoids the phenomena of pressure drop increase, flux reduction, salt permeability increase and the like of the membrane.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A method for cleaning and maintaining a water reuse membrane in PTA industry is characterized by comprising the following steps:
s1, selecting a cleaning method according to the water quality and the pollution condition;
s2, preparing a cleaning agent;
s3, flushing the system;
s4, acid washing, discharging and washing;
s5, alkali washing, discharging and washing;
s6, cleaning the membrane system, wherein the circulation time of the membrane system is not less than 2 hours by using an acidic cleaning agent, and the circulation time of the membrane system is not less than 2 hours by using an alkaline cleaning agent;
s7, system flushing and throwing: after the first section of membrane and the second section of membrane are cleaned, closing the cleaning fluid inlet and outlet valves; opening a flushing drain door, adopting a reverse osmosis low-pressure flushing mode, and flushing reverse osmosis; until the pH of the flushing water and the inlet water are close to or equal to each other; reverse osmosis is ready for use.
2. The method for cleaning and maintaining the water reuse membrane in the PTA industry as claimed in claim 1, wherein: the pickling is circulated through a low flow feed circulation 1/3 flow, soaking, high flow.
3. The method for cleaning and maintaining the water reuse membrane in the PTA industry as claimed in claim 1, wherein: the caustic wash is circulated through a low flow feed circulation 1/3 flow, soak, high flow.
4. The method for cleaning and maintaining the water reuse membrane in the PTA industry as claimed in claim 1, wherein: the cleaning flow rate was set at 9m3/h。
5. The method for cleaning and maintaining the water reuse membrane in the PTA industry as claimed in claim 1, wherein: the cleaning should not be below 15 ℃.
6. The method for cleaning and maintaining the water reuse membrane in the PTA industry as claimed in claim 1, wherein: the discharge time is not less than 10 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111369795.XA CN114011247A (en) | 2021-11-18 | 2021-11-18 | Method for cleaning and maintaining reclaimed water reuse membrane in PTA (pure terephthalic acid) industry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111369795.XA CN114011247A (en) | 2021-11-18 | 2021-11-18 | Method for cleaning and maintaining reclaimed water reuse membrane in PTA (pure terephthalic acid) industry |
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| Publication Number | Publication Date |
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| CN114011247A true CN114011247A (en) | 2022-02-08 |
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| CN202111369795.XA Pending CN114011247A (en) | 2021-11-18 | 2021-11-18 | Method for cleaning and maintaining reclaimed water reuse membrane in PTA (pure terephthalic acid) industry |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005028329A (en) * | 2003-07-10 | 2005-02-03 | Kurita Water Ind Ltd | Washing method of reverse osmosis membrane device |
| CN108187501A (en) * | 2018-01-04 | 2018-06-22 | 京能十堰热电有限公司 | A kind of cleaning method of reverse osmosis membrane system organic pollution |
| CN109224870A (en) * | 2018-11-19 | 2019-01-18 | 湖南军信环保股份有限公司 | A kind of nanofiltration, reverse osmosis membrane chemical cleaning method |
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2021
- 2021-11-18 CN CN202111369795.XA patent/CN114011247A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005028329A (en) * | 2003-07-10 | 2005-02-03 | Kurita Water Ind Ltd | Washing method of reverse osmosis membrane device |
| CN108187501A (en) * | 2018-01-04 | 2018-06-22 | 京能十堰热电有限公司 | A kind of cleaning method of reverse osmosis membrane system organic pollution |
| CN109224870A (en) * | 2018-11-19 | 2019-01-18 | 湖南军信环保股份有限公司 | A kind of nanofiltration, reverse osmosis membrane chemical cleaning method |
Non-Patent Citations (1)
| Title |
|---|
| 朱月海等: "《工业给水处理-膜清洗》", 同济大学出版社, pages: 360 * |
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