CN102407076A - Membrane element cleaning agent in membrane separation industry - Google Patents
Membrane element cleaning agent in membrane separation industry Download PDFInfo
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- CN102407076A CN102407076A CN2011103067160A CN201110306716A CN102407076A CN 102407076 A CN102407076 A CN 102407076A CN 2011103067160 A CN2011103067160 A CN 2011103067160A CN 201110306716 A CN201110306716 A CN 201110306716A CN 102407076 A CN102407076 A CN 102407076A
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Abstract
The invention discloses a membrane element cleaning agent in membrane separation industry. The membrane element cleaning solution prepared by the membrane element cleaning agent can completely remove the membrane pollution resulted during the plant extract separating process and can restore the property of the membrane element maximally.
Description
Technical field
The present invention relates to a kind of film separation industries and use the membrane component cleaning agent.Particularly; Relate to a kind of plant extract liquid film and separate membrane component cleaning agent with membrane component; Effectively removing the film that in the separation process of plant extract liquid film, causes with the membrane component cleaning fluid power of this membrane component cleaning agent preparation pollutes; And can recover the performance of membrane component to greatest extent, prolong the membrane component life cycle.Said pleurodiaphragmatic in terspace spare comprises: reverse-osmosis membrane element, hollow fibre membrane component, micro-filtration membrane element, ultrafiltration membrane elements and NF membrane element, wherein, preferred reverse-osmosis membrane element.
Background technology
Usually, after the film separating step carries out a period of time, membrane component; The suspension that possibly exist during particularly reverse-osmosis membrane element can be fed water or the pollution of indissoluble thing modally during these pollute are: precipitation of calcium carbonate, calcium sulfate precipitation; Metal (like iron, manganese, copper, nickel, aluminium etc.) oxide precipitation, polymerization siliceous deposits thing, non-soluble natural organic substance (NOM; Natural Organic Matter); Synthesis of organic substance (as: antisludging agent/dispersant, cationic polyelectrolyte), microorganism (algae, mould, fungi) etc.
When membrane component received inorganic salt crust, microorganism, colloidal solid and insoluble organic pollution, these contaminants were on the film surface, can cause standardized aquifer yield and system salt rejection rate to descend even deterioration.Thereby membrane component cleaning timely, make it recover the performance of membrane component to greatest extent.But in the membrane component cleaning process, if the cleaning chemicals of selecting is improper, it is not thorough then can to cause membrane component to clean, sometimes even can make the pollution grows worse of membrane component.Therefore before cleaning, select the corresponding cleaning chemicals to be necessary according to the dirt kind on film surface.
Usually the specific cleaning agent of dissimilar employings that is directed against pollutant at present cleans membrane component.For example: calcium carbonate scale, calcium sulfate dirt, barium sulfate, strontium sulfate scale, inorganic colloid etc. adopt hydrochloric acid (HCl) to clean; Metal oxide/hydroxide (Fe, Mn, Cu, Ni, Al) adopts solution of sodium bisulfite to clean; Inorganic/organic colloid mixture adopts NaOH or dodecyl sodium sulfate (SDS) solution to clean; Polymerization siliceous deposits thing adopts sodium hydroxide solution to clean; Microbiology class, non-soluble natural organic matter (NOM) adopt sodium phosphate trimer (STPP), neopelex (Na-DDBS), NaOH mixed solution to clean.Yet when membrane component receives the polytype contaminants, need adopt above-mentioned cleaning agent to clean respectively, thereby matting is complicated, scavenging period is long, and the water for cleaning power consumption is big, influences the membrane component life cycle.
Therefore, to the polytype contaminants, need a kind of complex cleaning and washing agent, it can effectively simplify matting, shortens and cleans the time spent, saves the water for cleaning electricity consumption.Because membrane component and cleaning agent are short time of contact, reduce chemical damage simultaneously, prolong the membrane component life cycle membrane component.But chemical composition is mixed with synergistic function; The prescription of appropriate design complex cleaning and washing agent how; In the emulsification dispersibility that improves neopelex surfactants such as (Na-DDBS); Improving the chela and the dispersibility of sodium phosphate trimer (STPP), calgon isochela and agent, thereby reduce use amount, the reduction use cost of chemical reagent, is the still unsolved technical problem of prior art.
Summary of the invention
The object of the invention is used the membrane component cleaning agent for a kind of film separation industries is provided, and the membrane component cleaning fluid of this cleaning agent preparation of usefulness and said membrane component cleaning agent and cleaning fluid are used to clean the purposes of film separation industries with membrane component.Said membrane component cleaning agent is effectively removed the film that in the film separation process, causes with the cleaning fluid power and is polluted, and recovers the performance of membrane component to greatest extent.
Wherein, Said membrane component comprises: reverse-osmosis membrane element, hollow fibre membrane component, micro-filtration membrane element, ultrafiltration membrane elements and NF membrane element; Preferred reverse-osmosis membrane element; Said film separation industries preferred plant extracts the liquid film separation industries, further, and preferred tea extract of said plant extraction liquid or extracts of Chinese herbal medicine.
For achieving the above object, the film separation industries of the present invention's design is following with the membrane component cleaning agent formula:
For reaching optimal cleaning effect, more preferably the membrane component cleaning agent formula is following:
| Prescription (except that indicating, being food-grade purity) | Consumption (weight portion) |
| Sodium phosphate trimer | 3-4 part |
| Calgon | 0.4-0.6 part |
| Sodium sulfite | 1.3-1.8 part |
| Natrium citricum | 0.5-0.8 part |
| EDTA-2Na/EDTA-4Na | 1-1.5 part |
| Neopelex/dodecyl sodium sulfate (95%, powder) | 0.7-0.9 part |
| NaOH | 0.4-0.7 part |
In the ratio preparation cleaning fluid of per 1000 liters of clean water, 5～20 weight portion cleaning agents, and its pH value is in 10～12 scope.
Beneficial effect
Because plant is of a great variety, different plant component differences are big, and the kindred plant composition is many, and the exception kindred plant is because of kind, and factors such as plantation region, weather, soil, season cause component difference.Plant is prepared in the process of plant extraction liquid in extraction, because of process variations such as plant cleaning, extraction cause the how different in nature of extract composition more.Therefore in separation process, possibly receive multiple pollutant type at plant extraction liquid pollutes.The film separation industries of the present invention's design is used the membrane component cleaning agent; After membrane component carried out cleaning for 1～2 time; Can eliminate calcium carbonate scale, calcium sulfate dirt, barium sulfate, strontium sulfate scale, inorganic colloid, metal oxide/hydroxide, inorganic/the organic colloid mixture, microbiology class, non-soluble natural organic matter (NOM) waits one or more pollutant types, recovers the membrane component performance.Not only matting is simple, and the province's water power that saves time also prolongs the membrane component life cycle.
The specific embodiment
Preparation embodiment
A kind of film separation industries is used the membrane component cleaning agent, fills a prescription as follows:
| Prescription (unreceipted is food-grade purity) | Consumption (weight portion) |
| Sodium phosphate trimer | 3.8 part |
| Calgon | 0.54 part |
| Sodium sulfite | 1.4 part |
| Natrium citricum | 0.54 part |
| EDTA-2Na/EDTA-4Na | 1.08 part |
| Neopelex/dodecyl sodium sulfate (95%, powder) | 0.76 part |
| NaOH | 0.58 part |
Embodiment 1
Film separates the cleaning of tea extract (comprising Chinese conventional tea such as black tea, green tea, oolong tea, jasmine tea) back membrane component.
Membrane separation plant is three grades of continuous reverse osmosis membrane separation equipment that Sandamo Science and Technology (Xiamen) Co., Ltd. manufactures and designs, and this equipment is made up of the BW30-365FR type reverse-osmosis membrane element that 18 FilmTec companies (LG-DOW company) produce.
The membrane component that film separates behind the tea extract cleans, and detailed process is following:
Low pressure is washed in advance: under 60Psi (4bar) or lower pressure condition, carry out low pressure and wash in advance, promptly (or suitable water source) pumps into clean water and emits then in membrane separation plant from purge tank, moves 10～20 minutes.Said clean water is RO (counter-infiltration) product water or the deionized water of removing hardness, not containing transition metal and chlorine residue.
The membrane component cleaning agent cleans: in purge tank, prepare cleaning fluid by the cleaning agent according to preparation embodiment preparation that adds 9 kilograms in per 1000 liters of clean water.The preparation water is a clean water.The temperature of cleaning fluid is that 38 ℃ and pH value are 10.5 ± 0.5 in the cleaning process.Start scavenging pump and cleaning solution is pumped in the membrane module about 0.8 hour of wash cycles.Before cleaning solution was back to purge tank, the phegma that is detained in the emptying system was in order to avoid cause dilution to cleaning solution.In initial 5 minutes, at leisure flow velocity is adjusted to 1/3 of design maximum flow velocity.It is stifled that this can reduce the potential dirt that is caused by a large amount of depositions of dirt.Increase 2/3 of flow velocity to design maximum flow velocity at second in 5 minutes, then, increase the Peak Flow Rate value of flow velocity again to design.If desired, when the variation of pH value exceeds above-mentioned scope, come to regulate again in pH value to the above-mentioned scope through the mode of adding NaOH.As required, can alternately adopt wash cycles and immersion program.Soak time can be selected according to the membrane component manufacturer's recommendation.To keep suitable temperature and pH value modestly.
Low-pressure washing: after Chemical cleaning finishes; Carry out low pressure (60Psi (4bar) or lower) flushing with clean water; From cleaning device/parts, remove the residual fraction of chemical agent, discharging is subsequently also washed purge tank with clean water, and then fill with purge tank fully to carry out low-pressure washing once more with clean water; Further remove the residual fraction of chemical agent in cleaning device/parts, consistent until discharge water pH value with clean water.
If desired, can repeat above-mentioned steps.
After the said method cleaning, the standard film flux of pleurodiaphragmatic in terspace spare (test condition: 2000ppm NaCl, 225psi (1.6MPa), 25 ℃, pH=8,15% rate of recovery) returns to more than 98%.This membrane component is continuous to be used after 18 months, weightening finish occurred, and the standard film flux descends about 20%, and the membrane component operating period reaches 24 months (standard film flux decline about 50% shows that the membrane component life cycle finishes).
The comparative example 1
Except cleaning agent formula adopts sodium phosphate trimer (2 weight portion), neopelex (0.5 weight portion 5), NaOH (0.5 weight portion); In purge tank, prepare beyond the cleaning fluid, adopt and carry out the cleaning of membrane component with embodiment 1 identical step by the cleaning agent that adds 15 kilograms in per 1000 liters of clean water.After the cleaning, the standard film flux of membrane component can only return to 80%, and this membrane component uses after 6 months continuously, and single membrane component weightening finish is more than 3 kilograms, and the standard film flux descends about 50%, and the membrane component operating period is merely 6 months.
Embodiment 2
Film separates the cleaning of extracts of Chinese herbal medicine (comprising Chinese traditional Chinese medicine materials such as Chinese medicine, cold tea) back membrane component.
Membrane separation plant is six grades of continuous reverse osmosis membrane separation equipment that German Ji Yiai (GEA) company manufactures and designs, and this equipment is made up of the HSRO-390-FF type reverse-osmosis membrane element that 180 FilmTec companies (LG-DOW company) produce.
The cleaning of membrane component behind the film separation extracts of Chinese herbal medicine, detailed process is following:
Low pressure is washed in advance: under 60Psi (4bar) or lower pressure condition, carry out low pressure and wash in advance, promptly (or suitable water source) pumps into clean water and emits then in membrane separation plant from purge tank, moves 10～20 minutes.
Cleaning agent cleans: in purge tank, press and add 18 kilograms the cleaning agent preparation cleaning fluid according to preparation embodiment preparation in per 1000 liters of clean water.The preparation water is a clean water.Rinse liquid temperature is that 43 ℃ and pH value are 11 ± 0.5 in the cleaning process.Start scavenging pump and cleaning solution is pumped in the membrane module about 1 hour of wash cycles.Before cleaning solution was back to purge tank, the phegma that is detained in the emptying system was in order to avoid cause dilution to cleaning solution.In initial 5 minutes, at leisure flow velocity is adjusted to 1/3 of design maximum flow velocity.It is stifled that this can reduce the potential dirt that is caused by a large amount of depositions of dirt.Increase 2/3 of flow velocity to design maximum flow velocity at second in 5 minutes, then, increase the Peak Flow Rate value of flow velocity again to design.If desired, when the variation of pH value exceeds above-mentioned scope, come to regulate again in pH value to the above-mentioned scope through the mode of adding NaOH.As required, can alternately adopt wash cycles and immersion program.Soak time can be selected according to the membrane component manufacturer's recommendation.To keep suitable temperature and pH value modestly.
Low-pressure washing: after Chemical cleaning finishes; To carry out low pressure (60Psi (4bar) or lower) flushing with clean water; From cleaning device/parts, remove the residual fraction of chemical agent, discharging is subsequently also washed purge tank with clean water, and then fill with purge tank fully to carry out low-pressure washing once more with clean water; Further remove the residual fraction of chemical agent in cleaning device/parts, consistent until discharge water pH value with clean water.
If desired, can repeat above-mentioned steps.
After the said method cleaning, the standard film flux of membrane component (test condition: 2000ppm NaCl, 150psi (1.03MPa), 25 ℃, pH=8,15% rate of recovery) returns to more than 98%.This membrane component used continuously after 24 months, and weightening finish does not appear in membrane component, and the standard film flux descends about 20%, use 30 months continuously after, weightening finish does not appear in membrane component, the standard film flux descends about 50%, the membrane component operating period reaches 30 months.
The comparative example 2
Except cleaning agent formula adopts sodium phosphate trimer (4 weight portion), neopelex (1 weight portion 5), NaOH (1.3 weight portion); In purge tank, prepare beyond the cleaning fluid, adopt and carry out the cleaning of membrane component with embodiment 2 identical steps by the cleaning agent that adds 35 kilograms in per 1000 liters of clean water.After the cleaning, the standard film flux of membrane component can only return to 65%, and this membrane component uses after 4 months continuously, and single membrane component weightening finish is more than 3.6 kilograms, and the standard film flux descends about 45%, and the membrane component operating period is merely 4 months.
Claims (10)
1. a film separation industries is used the membrane component cleaning agent, and it is filled a prescription as follows:
2. membrane component cleaning agent according to claim 1, it is filled a prescription as follows:
3. membrane component cleaning agent according to claim 2, it is filled a prescription as follows:
4. a membrane component cleaning fluid is characterized in that, based on 1000 liters of clean water, add 5～20 kilograms prepare said membrane component cleaning fluid according to each described membrane component cleaning agent among the claim 1-3.
5. membrane component cleaning fluid according to claim 4 is characterized in that, its pH value is in 10～12 scope.
6. membrane component cleaning agent according to claim 1 is used to clean the purposes of film separation industries with membrane component.
7. purposes according to claim 6, wherein, said membrane component is reverse-osmosis membrane element, hollow fibre membrane component, micro-filtration membrane element, ultrafiltration membrane elements or NF membrane element.
8. membrane component cleaning agent according to claim 7, wherein, said membrane component is a reverse-osmosis membrane element.
9. purposes according to claim 6, wherein, said film separation industries is a plant extract liquid film separation industries.
10. membrane component cleaning agent according to claim 9, wherein, said plant extraction liquid is tea extract or extracts of Chinese herbal medicine.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102806016A (en) * | 2012-07-31 | 2012-12-05 | 宝钢不锈钢有限公司 | Off-line cleaning method for reverse osmosis membranes |
| CN105413475A (en) * | 2015-11-17 | 2016-03-23 | 新疆水处理工程技术研究中心有限公司 | Cleaning agent suitable for cleaning hollow fiber nanofiltration membranes and preparation method thereof |
| CN105817143A (en) * | 2016-05-12 | 2016-08-03 | 中国石油集团东北炼化工程有限公司葫芦岛设计院 | Method for removing iron colloid on surface of ultrafiltration membrane |
| CN106630324A (en) * | 2016-12-06 | 2017-05-10 | 苏州赛斯德工程设备有限公司 | Central water purification equipment and membrane system cleaning method thereof |
| CN107376654A (en) * | 2017-08-25 | 2017-11-24 | 安徽智博新材料科技有限公司 | Cleaning microfiltration membranes agent is used in a kind of herbal mixture extract solution clarification |
| CN107413201A (en) * | 2017-04-26 | 2017-12-01 | 镇江市惠灵顿膜业有限公司 | A kind of cleaning method of reverse osmosis membrane |
| CN107670510A (en) * | 2017-10-25 | 2018-02-09 | 浙江工业大学 | A kind of hyperfiltration membrane cleaning agent containing oxidant and preparation method thereof |
| WO2018112939A1 (en) * | 2016-12-23 | 2018-06-28 | 王华勤 | Antifreeze glass cleaning agent |
| WO2018112938A1 (en) * | 2016-12-23 | 2018-06-28 | 王华勤 | Multiple-fiber composite cleaning agent |
| CN109718670A (en) * | 2017-10-31 | 2019-05-07 | 三达膜科技（厦门）有限公司 | One kind cleaning agents of membrane of alkalinity containing enzyme and its application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102806016A (en) * | 2012-07-31 | 2012-12-05 | 宝钢不锈钢有限公司 | Off-line cleaning method for reverse osmosis membranes |
| CN105413475A (en) * | 2015-11-17 | 2016-03-23 | 新疆水处理工程技术研究中心有限公司 | Cleaning agent suitable for cleaning hollow fiber nanofiltration membranes and preparation method thereof |
| CN105817143A (en) * | 2016-05-12 | 2016-08-03 | 中国石油集团东北炼化工程有限公司葫芦岛设计院 | Method for removing iron colloid on surface of ultrafiltration membrane |
| CN105817143B (en) * | 2016-05-12 | 2018-11-30 | 中国石油集团东北炼化工程有限公司葫芦岛设计院 | A kind of cleaning method of ultrafiltration membrane surface iron colloid |
| CN106630324A (en) * | 2016-12-06 | 2017-05-10 | 苏州赛斯德工程设备有限公司 | Central water purification equipment and membrane system cleaning method thereof |
| WO2018112939A1 (en) * | 2016-12-23 | 2018-06-28 | 王华勤 | Antifreeze glass cleaning agent |
| WO2018112938A1 (en) * | 2016-12-23 | 2018-06-28 | 王华勤 | Multiple-fiber composite cleaning agent |
| CN107413201A (en) * | 2017-04-26 | 2017-12-01 | 镇江市惠灵顿膜业有限公司 | A kind of cleaning method of reverse osmosis membrane |
| CN107376654A (en) * | 2017-08-25 | 2017-11-24 | 安徽智博新材料科技有限公司 | Cleaning microfiltration membranes agent is used in a kind of herbal mixture extract solution clarification |
| CN107670510A (en) * | 2017-10-25 | 2018-02-09 | 浙江工业大学 | A kind of hyperfiltration membrane cleaning agent containing oxidant and preparation method thereof |
| CN109718670A (en) * | 2017-10-31 | 2019-05-07 | 三达膜科技（厦门）有限公司 | One kind cleaning agents of membrane of alkalinity containing enzyme and its application |
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