CN110642426A - Method for efficiently treating RO (reverse osmosis) concentrated water - Google Patents
Method for efficiently treating RO (reverse osmosis) concentrated water Download PDFInfo
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- CN110642426A CN110642426A CN201910988928.8A CN201910988928A CN110642426A CN 110642426 A CN110642426 A CN 110642426A CN 201910988928 A CN201910988928 A CN 201910988928A CN 110642426 A CN110642426 A CN 110642426A
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- concentrated water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a method for efficiently treating RO concentrated water, which comprises the following steps: adding a strong acid solution alpha into the RO concentrated water to adjust the pH value of the RO concentrated water to 2-4; adding calcium oxide or/and calcium hydroxide into the RO concentrated water, and stirring; adding a strong alkali into the RO concentrated water and stirring to adjust the pH value of the RO concentrated water to 10-14; adding a strong oxide into the RO concentrated water; the RO concentrated water is stirred, and a strong acid solution beta is added to adjust the pH of the RO concentrated water back to 6-9 to dissolve part of the precipitate. The invention treats the concentrated water after the water reuse in the industrial Reverse Osmosis (RO) of paper making, printing and dyeing, parks and the like, leads the COD to be less than 50mg/L, decolours and removes phosphorus. And after the RO concentrated water is treated by ozone, the precipitate is less. The main medicaments of calcium oxide and calcium hydroxide are used in small amount, and are not added blindly, so that the amount of precipitates is further reduced.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a method for efficiently treating RO (reverse osmosis) concentrated water.
Background
The concentrated water after the reuse of industrial water in papermaking, printing and dyeing, parks and the like is different from the concentrated water in seawater desalination and industrial circulating water, and is a treatment problem in the water treatment industry because the concentrated water contains more refractory organic matters, has high salinity and high alkalinity; the existing RO concentrated water treatment has two approaches: firstly, the wastewater flows back to the front end of the wastewater treatment system for treatment, and the treatment mode can cause the continuous accumulation of organic matters which are difficult to biodegrade, so that the treatment efficiency of the whole wastewater treatment system is reduced; secondly, the waste gas is discharged after reaching the standard after being effectively treated; the main treatment processes at present are advanced oxidation technology and the combination technology of the advanced oxidation technology and a biological method.
At present, ozone catalytic oxidation is mainly utilized to reduce COD in wastewater, and the method is to add a medicament (mainly calcium oxide or calcium hydroxide) for removing hydroxyl radical scavenger (mainly carbonate and bicarbonate) generated by alkali catalytic ozone advanced oxidation into the wastewater, so that the hydroxyl radical scavenger is changed into precipitate to be separated from water, thereby improving the utilization efficiency of ozone and reducing the COD in the wastewater.
The prior art has the defects that: 1. if the content of carbonate radical or bicarbonate radical in the wastewater is high, a large amount of precipitate can be generated after the reagent is added, and the subsequent treatment cost of the precipitate is increased. 2. The agent is added according to the COD amount of the wastewater, and the adding is blind and large.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the method for efficiently treating the RO concentrated water, which has good treatment effect and high treatment efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for efficiently treating RO concentrated water comprises the following steps:
1) adding a strong acid solution alpha into the RO concentrated water to adjust the pH value of the RO concentrated water to 2-4;
2) adding calcium oxide or/and calcium hydroxide into the RO concentrated water, and stirring;
3) adding a strong alkali into the RO concentrated water and stirring to adjust the pH value of the RO concentrated water to 10-14;
4) adding a strong oxide into the RO concentrated water;
5) the RO concentrated water is stirred, and a strong acid solution beta is added to adjust the pH of the RO concentrated water back to 6-9 to dissolve part of the precipitate.
Preferably, the total calcium content of the calcium oxide or/and the calcium hydroxide added in the step 2) is the calcium content required for mineralizing the organic matter to generate calcium carbonate-the calcium content in the raw RO concentrated water; the calcium amount is controlled, so that the dosage of the medicament can be ensured not to be excessive, the use of the medicament is saved, the cost of water body treatment is reduced, and the calcium content in the treated water body is ensured to be in a standard range.
Preferably, the strong acid solution alpha is a hydrochloric acid solution; the raw materials of the hydrochloric acid solution are easy to obtain, and the water treatment cost is low.
Preferably, the strong acid solution beta is a hydrochloric acid solution; the raw materials of the hydrochloric acid solution are easy to obtain, and the water treatment cost is low.
Preferably, the strong base is sodium hydroxide or potassium hydroxide.
Preferably, the strong oxide is ozone gas.
Preferably, the ozone concentration C is 30-60mg/L, the feeding speed v is 0.2-0.8L/min, and the oxidation time t is 20-60 min.
Preferably, the precipitate remaining in step 5) is a calcium carbonate precipitate, and the calcium carbonate precipitate is taken out and then calcined at a high temperature to form calcium oxide; the calcium oxide can be reused after being calcined, so that the amount of the calcium oxide is saved, and the cost of the calcium oxide is reduced.
Preferably, the stirring time in step 2) is 5-15 min.
Preferably, the stirring time in step 5) is 10-30 min.
In summary, the present invention has the following effects:
1) treating the concentrated water after water reuse in industrial Reverse Osmosis (RO) of papermaking, printing and dyeing, parks and the like to ensure that COD is less than 50mg/L, decoloring and dephosphorizing.
2) And after the RO concentrated water is treated by ozone, the precipitate is less.
3) The main medicament calcium oxide or calcium hydroxide is used in a small amount, and is not added blindly, so that the amount of precipitate is further reduced.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
Example one
Taking 600ml of papermaking RO concentrated water, wherein the pH value of the RO concentrated water is 7.56, the COD is 260mg/L, the calcium content is 242mg/L, and the alkalinity is 935 mg/L; and the RO concentrated water is subjected to water treatment, which comprises the following steps:
1) the RO concentrate was added to (1: 2)5ml of strong acid solution alpha (the strong acid solution alpha is hydrochloric acid solution) to adjust the pH value of the RO concentrated water to be 2.26, a large amount of bubbles are generated during the process, and the mixture is stirred for 10min to ensure that all bicarbonate radicals in the RO concentrated water are converted into carbon dioxide to escape, so as to remove the hydroxyl radical scavenger;
2) adding calcium oxide or/and calcium hydroxide into RO concentrated water, and stirring for 10min to mix the medicinal preparation completely; the total calcium content of the added calcium oxide or/and calcium hydroxide is the calcium content required for generating calcium carbonate by mineralizing the organic matter-the calcium content in the original RO concentrated water, so that the added medicament is ensured not to be excessive;
3) adding 20ml of 1mol/L strong alkali (the strong alkali is sodium hydroxide solution) into the RO concentrated water to adjust the pH value of the RO concentrated water to be 12.14;
4) adding a strong oxide into the RO concentrated water; wherein the ozone concentration C is 40mg/L, the speed v of introducing the ozone into the RO concentrated water is 0.5L/min, and the oxidation time t is 30 min;
5) stirring the RO concentrated water, and adding a strong acid solution beta (the strong acid solution beta is a hydrochloric acid solution) to adjust the pH of the RO concentrated water back to 6-7 so as to dissolve part of precipitates; the remaining precipitate was calcium carbonate precipitate, and the calcium carbonate precipitate was taken out, and then calcined at 900 ℃ for 2 hours to generate calcium oxide powder, and the calcium oxide powder was reused.
And (4) conclusion: the supernatant of the treated RO concentrated water is colorless, COD is less than 50mg/L, and total phosphorus is less than 0.1 mg/L.
Example two
Taking 600ml of printing and dyeing RO concentrated water, wherein the pH value of the RO concentrated water is 8.01, the COD is 240mg/L, the calcium content is 231mg/L, and the alkalinity is 874 mg/L; and the RO concentrated water is subjected to water treatment, which comprises the following steps:
1) adding 1: 2, 3ml of hydrochloric acid and 3ml of strong acid solution alpha (the strong acid solution alpha is a hydrochloric acid solution) to adjust the pH value of the RO concentrated water to be 3.12, a large amount of bubbles are generated in the process, and the mixture is stirred for 10min to ensure that all bicarbonate radicals in the RO concentrated water are converted into carbon dioxide to escape, so that the hydroxyl radical scavenger is removed;
2) adding calcium oxide or/and calcium hydroxide into RO concentrated water, and stirring for 5min to mix the medicinal preparation completely; the total calcium content of the added calcium oxide or/and calcium hydroxide is the calcium content required for generating calcium carbonate by mineralizing the organic matter-the calcium content in the original RO concentrated water, so that the added medicament is ensured not to be excessive;
3) adding 15mL of 1mol/L strong alkali (the strong alkali is a potassium hydroxide solution) into the RO concentrated water to adjust the pH value of the RO concentrated water to be 10.89;
4) adding a strong oxide into the RO concentrated water; wherein the ozone concentration C is 30mg/L, the speed v of introducing the ozone into the RO concentrated water is 0.2L/min, and the oxidation time t is 60 min;
5) stirring the RO concentrated water, and adding a strong acid solution beta (the strong acid solution beta is a hydrochloric acid solution) to adjust the pH of the RO concentrated water back to 8-9 so as to dissolve part of precipitates; and the remaining precipitate was calcium carbonate precipitate, and the calcium carbonate precipitate was taken out, and then calcined at 900 ℃ for 2 hours to generate calcium oxide powder, and the calcium oxide powder was reused.
And (4) conclusion: the supernatant of the treated RO concentrated water is colorless, COD is 40-50mg/L, and total phosphorus is 0.05-0.1 mg/L.
EXAMPLE III
Taking RO concentrated water in a 600m park, wherein the pH value of the RO concentrated water is 8.12, the COD is 216mg/L, the calcium content is 288mg/L, and the alkalinity is 912 mg/L; and the RO concentrated water is subjected to water treatment, which comprises the following steps:
1) adding 1: 2ml of hydrochloric acid 2ml of a strong acid solution alpha (the strong acid solution alpha is a hydrochloric acid solution) to adjust the pH value of the RO concentrated water to 3.89, a large amount of bubbles are generated during the adjustment, and the stirring is carried out for 10min to ensure that all bicarbonate radicals in the RO concentrated water are converted into carbon dioxide to escape, so as to remove the hydroxyl radical scavenger;
2) adding calcium oxide or/and calcium hydroxide into RO concentrated water, and stirring for 15min to make the medicinal preparation fully mixed; the total calcium content of the added calcium oxide or/and calcium hydroxide is the calcium content required for generating calcium carbonate by mineralizing the organic matter-the calcium content in the original RO concentrated water, so that the added medicament is ensured not to be excessive;
3) adding 25mL of 1mol/L strong alkali (the strong alkali is sodium hydroxide solution) into the RO concentrated water to adjust the pH value of the RO concentrated water to be 13.15; a
4) Adding a strong oxide into the RO concentrated water; wherein the ozone concentration C is 50mg/L, the speed v of introducing the ozone into the RO concentrated water is 0.7L/min, and the oxidation time t is 20 min;
5) stirring the RO concentrated water, and adding a strong acid solution beta (the strong acid solution beta is a hydrochloric acid solution) to adjust the pH of the RO concentrated water back to 8-9 so as to dissolve part of precipitates; and the remaining precipitate was calcium carbonate precipitate, and the calcium carbonate precipitate was taken out, and then calcined at 900 ℃ for 2 hours to generate calcium oxide powder, and the calcium oxide powder was reused.
And (4) conclusion: the supernatant of the treated RO concentrated water is colorless, COD is 35-45mg/L, and total phosphorus is 0.05-0.1 mg/L.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (10)
1. A method for efficiently treating RO concentrated water is characterized in that: the method comprises the following steps:
1) adding a strong acid solution alpha into the RO concentrated water to adjust the pH value of the RO concentrated water to 2-4;
2) adding calcium oxide or/and calcium hydroxide into the RO concentrated water, and stirring;
3) adding a strong alkali into the RO concentrated water and stirring to adjust the pH value of the RO concentrated water to 10-14;
4) adding a strong oxide into the RO concentrated water;
5) the RO concentrated water is stirred, and a strong acid solution beta is added to adjust the pH of the RO concentrated water back to 6-9 to dissolve part of the precipitate.
2. The method for efficiently treating RO concentrated water according to claim 1, characterized by: the total calcium content of the calcium oxide or/and the calcium hydroxide added in the step 2), which is the calcium content required for generating calcium carbonate by mineralizing the organic matter, is the calcium content contained in the original RO concentrated water.
3. The method for efficiently treating RO concentrated water according to claim 1, characterized by: the strong acid solution alpha in the step 1) is a hydrochloric acid solution.
4. The method for efficiently treating RO concentrated water according to claim 1, characterized by: and 5) the strong acid solution beta is a hydrochloric acid solution.
5. The method for efficiently treating RO concentrated water according to claim 1, characterized by: and 3) the strong alkali in the step 3) is sodium hydroxide or/and potassium hydroxide.
6. The method for efficiently treating RO concentrated water according to claim 1, characterized by: and 4) the strong oxide is ozone gas.
7. The method for efficiently treating RO concentrated water according to claim 6, characterized by: the ozone concentration C is 30-60mg/L, the feeding speed v is 0.2-0.8L/min, and the oxidation time t is 20-60 min.
8. The method for efficiently treating RO concentrated water according to claim 1, characterized by: the precipitate remaining in step 5) is a calcium carbonate precipitate, and the calcium carbonate precipitate is removed and then calcined at high temperature to form calcium oxide.
9. The method for efficiently treating RO concentrated water according to claim 1, characterized by: the stirring time in the step 2) is 5-15 min.
10. The method for efficiently treating RO concentrated water according to claim 1, characterized by: the stirring time in the step 5) is 10-30 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910988928.8A CN110642426A (en) | 2019-10-17 | 2019-10-17 | Method for efficiently treating RO (reverse osmosis) concentrated water |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910988928.8A CN110642426A (en) | 2019-10-17 | 2019-10-17 | Method for efficiently treating RO (reverse osmosis) concentrated water |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104418451A (en) * | 2013-08-20 | 2015-03-18 | 中国石油化工股份有限公司 | Reverse osmosis concentrated water treatment method |
| CN104591481A (en) * | 2014-12-23 | 2015-05-06 | 天津市超膜科技有限公司 | Composite reverse osmosis water treatment technology |
| CN105174641A (en) * | 2015-10-10 | 2015-12-23 | 博瑞德（南京）净化技术有限公司 | Treating technology for chemical RO concentrated water |
| CN106430770A (en) * | 2016-07-25 | 2017-02-22 | 王园伟 | Drinking water and preparation process thereof |
| CN106746131A (en) * | 2017-01-23 | 2017-05-31 | 上海中耀环保实业有限公司 | A kind of organic wastewater reverse osmosis concentrated water oxidation and desalination process and system |
-
2019
- 2019-10-17 CN CN201910988928.8A patent/CN110642426A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104418451A (en) * | 2013-08-20 | 2015-03-18 | 中国石油化工股份有限公司 | Reverse osmosis concentrated water treatment method |
| CN104591481A (en) * | 2014-12-23 | 2015-05-06 | 天津市超膜科技有限公司 | Composite reverse osmosis water treatment technology |
| CN105174641A (en) * | 2015-10-10 | 2015-12-23 | 博瑞德（南京）净化技术有限公司 | Treating technology for chemical RO concentrated water |
| CN106430770A (en) * | 2016-07-25 | 2017-02-22 | 王园伟 | Drinking water and preparation process thereof |
| CN106746131A (en) * | 2017-01-23 | 2017-05-31 | 上海中耀环保实业有限公司 | A kind of organic wastewater reverse osmosis concentrated water oxidation and desalination process and system |
Non-Patent Citations (1)
| Title |
|---|
| 张倩 等: "《水环境化学》", 30 June 2018 * |
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Application publication date: 20200103 |