CN112744948A - Pure water preparation method - Google Patents
Pure water preparation method Download PDFInfo
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- CN112744948A CN112744948A CN202011470833.6A CN202011470833A CN112744948A CN 112744948 A CN112744948 A CN 112744948A CN 202011470833 A CN202011470833 A CN 202011470833A CN 112744948 A CN112744948 A CN 112744948A
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- China
- Prior art keywords
- pure water
- sewage
- water
- filtering
- reverse osmosis
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
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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
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
A preparation method of pure water comprises the following steps: (1) firstly, injecting urban sewage into a pretreatment clarification tank, and adding polyaluminium chloride into the pretreatment clarification tank according to the turbidity condition of the sewage; (2) injecting the sewage treated in the step (1) into a desalting and hardening reduction bed, wherein the desalting and hardening reduction bed is added with cation resin, the filling amount is 9t, and the passing water flow is 120-140m3H; (3) then filtering and filtering the mixture by a multi-medium filter and a cartridge filter; (4) the sewage treated by the security filter is filtered by a two-stage reverse osmosis membrane; (5) finally, the prepared pure water is discharged through an EDR device. The method can treat the municipal sewage into pure water meeting the industrial production requirement, ensures the safe operation of the reverse osmosis membrane, achieves the purposes of reasonably utilizing resources, reducing discharge and increasing social benefits.
Description
Technical Field
The invention relates to a preparation method of pure water.
Background
China is a water-deficient country, so that water resources are saved, the water-deficient condition of cities is relieved, the water cost of residents is reduced, and the quality of life of the residents is improved. The urban domestic sewage is a water resource with relatively stable water quality because of less influence of natural conditions such as climate, season and the like, and if the urban domestic sewage can be effectively used for urban miscellaneous water such as industrial water, agricultural irrigation water, municipal greening landscape water and the like after being treated. A large amount of primary water can be saved. The water quality is poor and the water source is difficult to meet the requirement of producing water sources because the water on the surface of a nearby river is taken as the production water of a company, the upstream of the dry period is anhydrous, and the downstream of the dry period is in parallel flow with the effluent of the urban sewage treatment. In order to ensure the safety of production water in all seasons, reduce the consumption of tap water and give way to urban domestic water, the urban domestic sewage is utilized for retreatment and reused for industrial production, the potential of the original device is excavated to the maximum extent, resources are reasonably utilized, the discharge is reduced, and the social benefit is increased.
In chemical production, pure water is generally prepared by ion exchange and reverse osmosis, and the ion exchange water preparation method eliminates the problems of more waste water generated in the production process, high environmental protection pressure, strict requirements on source water and the like; the reverse osmosis production process also has higher requirements on the quality of raw water, particularly organic matters and suspended matters, a plurality of filtering devices are arranged before the organic matters and the suspended matters enter the reverse osmosis membrane, otherwise, the membrane elements are blocked and polluted to lose the function quickly. Many companies' reverse osmosis water production uses tap water as a water source,
at present, industrial water taking sources are tap water subjected to municipal treatment, although the discharge reaches the standard, the industrial water taking sources have large index difference as water taking sources for production, water contains higher organic matters, suspended matters and hardness, unidentified pollutants and the like, and the conventional treatment process cannot ensure the safe operation of a reverse osmosis membrane.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of pure water, which can treat municipal sewage into pure water meeting the industrial production requirement, ensure the safe operation of a reverse osmosis membrane, reasonably utilize resources, reduce discharge and increase social benefits.
The invention provides a pure water preparation method for solving the technical problems, which comprises the following steps:
(1) firstly, injecting urban sewage into a pretreatment clarification tank, and adding polyaluminium chloride into the pretreatment clarification tank according to the turbidity condition of the sewage;
(2) injecting the sewage treated in the step (1) into a desalting and hardening reduction bed, wherein the desalting and hardening reduction bed is added with cation resin, the filling amount is 9t, and the passing water flow is 120-140m3/h；
(3) Then filtering and filtering the mixture by a multi-medium filter and a cartridge filter;
(4) the sewage treated by the security filter is filtered by a two-stage reverse osmosis membrane;
(5) finally, the prepared pure water is discharged through an EDR device.
Preferably, the flow speed of the sewage passing through the pre-treatment clarification tank is 250-350m3The settling time is 1.5-2.5 h.
Preferably, the pH is adjusted to 6.5-7.5 in the pre-treatment clarifier.
Preferably, the filtration pressure of the cation resin is controlled to be 0.1-0.8mPA, and the temperature is controlled to be 20-25 ℃.
Preferably, the mesh number of the security filter is 8-15 meshes.
Preferably, the temperature is controlled to be 20-25 ℃ and the pH is controlled to be 6.5-7.5 when the water passes through the reverse osmosis filtering membrane.
The invention has the advantages that: aiming at the problem that the treated urban domestic sewage has poor water quality (the ammonia nitrogen content is generally 15-30mg/L, COD and is generally 100-200 mg/L) and other impurities), after the pretreatment process is adopted, the ammonia nitrogen can be reduced to below 1mg/L, and the COD can be reduced to below 5mg/L so as to ensure the water quality requirement before reverse osmosis, specifically, a clarification tank is adopted for adding chemicals for flocculation and sedimentation, and an alkali and hardness reducing bed is adopted to reduce the temporary hardness of water, and pollutants and metal ions in the water, such as iron, aluminum, strontium and the like, can be removed, so that the long-term safe operation of reverse osmosis is facilitated.
Detailed Description
The first embodiment is as follows:
a method for preparing pure water is characterized by comprising the following steps:
(1) firstly, the urban sewage is injected into a pretreatment clarification tank, the ammonia nitrogen content of the sewage is 30mg/L, COD content and 200mg/L, and the flow rate is 250m3Adding polyaluminium chloride into a pretreatment clarifying tank according to the turbidity condition of sewage, and adjusting the pH value to 6.5-7.5 by 31% of hydrochloric acid and 32% of sodium hydroxide in percentage by mass;
(2) injecting the sewage treated in the step (1) into a desalting and hardness reducing bed,controlling the filtration pressure of the cation resin in the desalting and hardening reduction bed at 0.1-0.8mPA, the temperature at 20-25 ℃, adding the cation resin in the desalting and hardening reduction bed with the filling amount of 9t, and passing water flow of 120-140m3/h；
(3) Then filtering and filtering the mixture by a multi-medium filter and a cartridge filter;
(4) filtering the sewage treated by the cartridge filter by a two-stage reverse osmosis membrane, wherein the temperature of the reverse osmosis filtration is controlled to be 20-25 ℃, and the pH value is controlled to be 6.5-7.5;
(5) and finally, discharging the prepared pure water through an EDR device, wherein the ammonia nitrogen content and the COD content of the discharged pure water are 0.5mg/L and 3mg/L, and the requirement of the production on the pure water is met.
Example two:
a method for preparing pure water is characterized by comprising the following steps:
(1) firstly, the urban sewage is injected into a pretreatment clarification tank, the ammonia nitrogen content of the sewage is 25mg/L, COD content and 150mg/L, and the flow rate is 350m3Adding polyaluminium chloride into a pretreatment clarifying tank according to the turbidity condition of sewage, and adjusting the pH value to 6.5-7.5 by 31% of hydrochloric acid and 32% of sodium hydroxide in percentage by mass;
(2) injecting the sewage treated in the step (1) into a desalting and hardening reduction bed, controlling the filtration pressure of the cation resin of the desalting and hardening reduction bed to be 0.1-0.8mPA, controlling the temperature to be 20-25 ℃, adding the cation resin into the desalting and hardening reduction bed, controlling the filling amount to be 9t, and controlling the water flow to be 120-140 m-3/h；
(3) Then filtering and filtering the mixture by a multi-medium filter and a cartridge filter;
(4) filtering the sewage treated by the cartridge filter by a two-stage reverse osmosis membrane, wherein the temperature of the reverse osmosis filtration is controlled to be 20-25 ℃, and the pH value is controlled to be 6.5-7.5;
(5) and finally, discharging the prepared pure water through an EDR device, wherein the ammonia nitrogen content and the COD content of the discharged pure water are 0.1mg/L and 1mg/L, and the requirement of the production on the pure water is met.
Example three:
a method for preparing pure water is characterized by comprising the following steps:
(1) firstly, cityThe municipal sewage is injected into a pre-treatment clarification tank, the ammonia nitrogen content of the sewage is 15mg/L, COD content of 100mg/L, and the flow rate is 300m3Adding polyaluminium chloride into a pretreatment clarifying tank according to the turbidity condition of sewage, and adjusting the pH value to 6.5-7.5 by 31% of hydrochloric acid and 32% of sodium hydroxide in percentage by mass;
(2) injecting the sewage treated in the step (1) into a desalting and hardening reduction bed, controlling the filtration pressure of the cation resin of the desalting and hardening reduction bed to be 0.1-0.8mPA, controlling the temperature to be 20-25 ℃, adding the cation resin into the desalting and hardening reduction bed, controlling the filling amount to be 9t, and controlling the water flow to be 120-140 m-3/h；
(3) Then filtering and filtering the mixture by a multi-medium filter and a cartridge filter;
(4) filtering the sewage treated by the cartridge filter by a two-stage reverse osmosis membrane, wherein the temperature of the reverse osmosis filtration is controlled to be 20-25 ℃, and the pH value is controlled to be 6.5-7.5;
(5) and finally, discharging the prepared pure water through an EDR device, wherein the ammonia nitrogen content and the COD content of the discharged pure water are 0.02mg/L and 0.5mg/L, and the requirement of the production on the pure water is met.
In the above embodiment:
the cation resin is special cation resin for alkali removal and hardness reduction bed provided by Xuzhou water treatment research institute.
The multi-media filter is manufactured by Xuzhou water treatment equipment limited, and the filler with the size of 3200 x 4876mm is quartz sand and water-washed anthracite.
The filter material of the cartridge filter is a large-flow folding filter element made of PP material, and the manufacturer is Shanghai Chu energy industrial filtration system limited company with the model of CCZD-PP-40-5 (P).
The reverse osmosis membrane is an American Dow reverse osmosis membrane with a membrane type number BW30-400, and the salt rejection rate is more than or equal to 95 percent.
EDR device procurement is from the good water treatment limited, model: LJSED-100W.
Claims (6)
1. A method for preparing pure water is characterized by comprising the following steps:
(1) firstly, injecting urban sewage into a pretreatment clarification tank, and adding polyaluminium chloride into the pretreatment clarification tank according to the turbidity condition of the sewage;
(2) injecting the sewage treated in the step (1) into a desalting and hardening reduction bed, wherein the desalting and hardening reduction bed is added with cation resin, the filling amount is 9t, and the passing water flow is 120-140m3/h；
(3) Then filtering and filtering the mixture by a multi-medium filter and a cartridge filter;
(4) the sewage treated by the security filter is filtered by a two-stage reverse osmosis membrane;
(5) finally, the prepared pure water is discharged through an EDR device.
2. The method for producing pure water according to claim 1, wherein: the flow rate of the sewage passing through the pretreatment clarification tank is 250-350m3The settling time is 1.5-2.5 h.
3. The method for producing pure water according to claim 1, wherein: the pH was adjusted to 6.5-7.5 in a pre-treatment clarifier.
4. The method for producing pure water according to claim 1, wherein: the filtering pressure of the cation resin is controlled to be 0.1-0.8mPA, and the temperature is controlled to be 20-25 ℃.
5. The method for producing pure water according to claim 1, wherein: the mesh number of the security filter is 8-15 meshes.
6. The method for producing pure water according to claim 1, wherein: the temperature is controlled at 20-25 ℃ and the pH is controlled at 6.5-7.5 when the wastewater passes through a reverse osmosis filter membrane.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011470833.6A CN112744948A (en) | 2020-12-15 | 2020-12-15 | Pure water preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011470833.6A CN112744948A (en) | 2020-12-15 | 2020-12-15 | Pure water preparation method |
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| CN112744948A true CN112744948A (en) | 2021-05-04 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1810662A (en) * | 2006-01-28 | 2006-08-02 | 北京·松下彩色显象管有限公司 | Technological process of treating sewage into pure water |
| CN102285736A (en) * | 2011-06-17 | 2011-12-21 | 河北省电力建设调整试验所 | Reverse osmosis pre-treatment method for recycling reclaimed water in electric power plant |
| KR20160004063A (en) * | 2014-07-02 | 2016-01-12 | 한국해양과학기술원 | Removal system of sulfate in seawater using ion exchange resin |
| CN107098526A (en) * | 2016-02-22 | 2017-08-29 | 麦王环境技术股份有限公司 | The film concentrator and handling process of strong brine zero-emission sub-prime crystallization |
| CN109502871A (en) * | 2019-01-08 | 2019-03-22 | 山东蓝然环境科技有限公司 | A kind of high-salinity wastewater zero-emission and divide salt resource utilization device |
-
2020
- 2020-12-15 CN CN202011470833.6A patent/CN112744948A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1810662A (en) * | 2006-01-28 | 2006-08-02 | 北京·松下彩色显象管有限公司 | Technological process of treating sewage into pure water |
| CN102285736A (en) * | 2011-06-17 | 2011-12-21 | 河北省电力建设调整试验所 | Reverse osmosis pre-treatment method for recycling reclaimed water in electric power plant |
| KR20160004063A (en) * | 2014-07-02 | 2016-01-12 | 한국해양과학기술원 | Removal system of sulfate in seawater using ion exchange resin |
| CN107098526A (en) * | 2016-02-22 | 2017-08-29 | 麦王环境技术股份有限公司 | The film concentrator and handling process of strong brine zero-emission sub-prime crystallization |
| CN109502871A (en) * | 2019-01-08 | 2019-03-22 | 山东蓝然环境科技有限公司 | A kind of high-salinity wastewater zero-emission and divide salt resource utilization device |
Non-Patent Citations (1)
| Title |
|---|
| 北京市科学技术协会等: "《走进膜的世界》", 31 December 2017, 北京出版社 * |
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Application publication date: 20210504 |
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