KR101309565B1 - Method for Removing Phosphorus in wastewater Using Crystal from P-C SWRO system - Google Patents
Method for Removing Phosphorus in wastewater Using Crystal from P-C SWRO system Download PDFInfo
- Publication number
- KR101309565B1 KR101309565B1 KR1020100124950A KR20100124950A KR101309565B1 KR 101309565 B1 KR101309565 B1 KR 101309565B1 KR 1020100124950 A KR1020100124950 A KR 1020100124950A KR 20100124950 A KR20100124950 A KR 20100124950A KR 101309565 B1 KR101309565 B1 KR 101309565B1
- Authority
- KR
- South Korea
- Prior art keywords
- reverse osmosis
- phosphorus
- sewage
- crystals
- osmosis membrane
- Prior art date
Links
Images
Classifications
-
- 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
Landscapes
- 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)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
P-C. Of the present invention. The method for removing phosphorus in sewage by reusing crystals generated in the SWRO system is characterized by removing phosphorus by injecting the crystals obtained from the seawater desalination process using a reverse osmosis membrane into the crystallization dephosphorization apparatus. The method not only reduces the cost of waste disposal by using the crystals generated in the SWRO system, but also reduces the chemical cost consumed in the phosphorus removal process using the conventional crystallization method, and excessive initial investment and sludge. It can solve problems such as formation and remove phosphorus efficiently.
Description
The present invention relates to a method for removing phosphorous in sewage using crystals generated in a PC SWRO system. More specifically, the present invention not only reduces expensive chemical costs by using crystals generated in a seawater desalination system, but also reuses wastewater in a seawater desalination system that has been disposed of previously, thereby reducing treatment costs. It relates to a removal method.
Recently, as untreated raw materials are introduced into rivers and other water sources due to the increase of domestic sewage and industrial wastewater, algae increase in the water due to excessive discharge of nutrients. This causes eutrophication and adversely affects the water environment and the use of water resources, thereby greatly reducing the value of water use.
In order to solve these problems, the Ministry of Environment is strengthening the discharged water quality standards of wastewater treatment facilities to improve the river water quality. In particular, as the standard for total phosphorus, which is a major source of eutrophication, has been greatly strengthened, in the case of water supply protection zones and waterside zones, where water conservation is of great importance, total phosphorus was 20 times higher than 0.2 mg / l. Reinforced. In addition, in the past, only the concentration of substances from the pollutant discharge facility was regulated. In recent years, the total amount of pollutants has been changed.In addition, the first stage of biochemical oxygen demand (BOD), which is the first organic pollutant, the second stage is the total amount of eutrophication of rivers and lakes. It is included in controlled substances in India. As a result, Korean environmental science and environmental industry faced the task of developing efficient phosphorus removal processes and introducing them into wastewater treatment facilities in accordance with government regulations.
Conventionally, a method of using waste steel, steelmaking slag, and the like in the phosphorus removal process has been studied.
The present inventors have developed a desalination process of seawater using a SWRO membrane (Patent Application 2010-67495). The process causes the scale to deliberately increase the pH of the concentrated water subjected to the first reverse osmosis process, remove it through filtration, and then perform the second reverse osmosis process to remove the ionic form of boron due to the elevated pH. In this process, a large amount of crystals occur. The inventors of the present invention not only can reduce the expensive chemical cost by using the crystals generated in the process in the sewage removal method, but also a sewage treatment method that can reduce the treatment cost by reusing wastes in the seawater desalination system, which was previously disposed. It is early to develop.
It is an object of the present invention to provide a method for removing phosphorus in sewage which is economically and efficiently capable of removing phosphorus.
Another object of the present invention is not only to reduce the cost of waste disposal in the SWRO process, but also to reduce the chemical cost consumed in the phosphorus removal process using the conventional crystallization method, excessive initial investment cost, such as sludge generation It is to provide a way to solve the problem and remove phosphorus efficiently.
Still another object of the present invention is to provide a method capable of coping with the discharge water quality standard T-P item.
The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical subjects which are not mentioned can be understood by those skilled in the art from the following description.
One aspect of the invention relates to a method for removing phosphorus in sewage. The method is characterized in that the phosphorus is removed by injecting the crystal obtained in the seawater desalination process using a reverse osmosis membrane to the crystallization dephosphorization apparatus.
The crystal may be obtained by reverse osmosis of seawater using a reverse osmosis membrane, and then crystallization by adjusting the pH of the concentrated water that did not pass through the reverse osmosis membrane.
The crystallization process is characterized in that to adjust the pH of the concentrated water to the 9.0 ~ 10.5 zone. The pH adjustment can be carried out by the addition of Ca (OH) 2 , NaOH, NaCO or KOH.
The present invention can economically and efficiently remove phosphorus, reduce the cost of crystallization in SWRO process, and reduce the chemical cost consumed in the conventional phosphorus removal process using crystallization. In addition, it is possible to solve problems such as excessive initial investment cost and sludge generation, remove phosphorus efficiently, and provide a method that can cope with TP items.
1 is a schematic process diagram of a method for removing phosphorous in sewage using crystals according to one embodiment of the present invention.
Figure 2 is a general schematic diagram of the crystal reuse method in the seawater desalination process according to an embodiment of the present invention.
Phosphorus removal method in the sewage of the present invention is characterized in that the crystal obtained by the desalination process in the seawater desalination process using a reverse osmosis membrane to remove the phosphorus.
The crystal may be obtained by reverse osmosis of seawater using a reverse osmosis membrane, and then crystallization by adjusting the pH of the concentrated water that did not pass through the reverse osmosis membrane.
In embodiments the crystals are i) performing a reverse osmosis process using a shear reverse osmosis membrane in seawater; ii) performing a crystallization process by adjusting the pH of the concentrated water that has not passed through the reverse osmosis membrane; And iii) recovering the crystallized crystals.
The reverse osmosis membrane has a characteristic that the solvent and the solute are separated by applying a pressure greater than the osmotic pressure by using a semi-permeable membrane that passes through a solvent, that is, water, and solutes such as salt, etc., the inorganic ions, Low molecular organics can be removed. The range to be separated is fraction molecular weight of 350 Da or less, and the operating pressure can be up to 40 ~ 100bar.
The crystallization process is characterized in that the pH of the concentrated water is adjusted to the range of 9.0 ~ 10.5. In the pH range of Ca 2 +, Mg 2 +, such as divalent cations and the HCO 3 -, CO 3 2 - the crystals are produced by a combination of the anion or the like, the resulting crystals are separated from the supernatant be precipitated. The crystal may include a cation such as Ca or Mg.
The pH adjustment can be controlled by adding a pH adjuster such as Ca (OH) 2 , NaOH, NaCO or KOH to the concentrated water. These may be used in the form of a solution of 1 ~ 3N concentration to minimize the volume change of the treated water.
Preferably, in order to increase the efficiency of the crystallization, CO 2 may be supplied to the nanobubbling device. This is because CO 2 dissolves and combines with cations in water to form crystals. As the crystals, CaCO 3 , MgCO 3 and the like predominantly.
Crystals generated in the pre-crystallization may be directly added to the crystallization dephosphorization apparatus or after drying and grinding. The crystallization dephosphorization apparatus can be used as it is, and can be installed by a person having ordinary knowledge of the art to which the present invention belongs.
1 is a schematic process diagram of a method for removing phosphorous in sewage using crystals according to one embodiment of the present invention. As shown in FIG. 1, crystals obtained from sewage and seawater desalination processes are injected into a settling tank. The crystals may be added at a concentration of 0.01 to 10 wt% based on the sewage. Agitation is carried out while injecting the crystals, and then the phosphorus may be removed by adjusting the pH to 9-11, preferably pH 9.5-10.5.
The present invention will be described in more detail with reference to the following examples, but the following examples are only intended to illustrate the invention and thus should not be construed as limiting the scope of the invention.
Example One:
1-1: Experiment apparatus
Crystallization and reverse osmosis membrane device used in this experiment is composed of a high pressure pump, nanobubbling device, SWRO membrane and the like, the schematic diagram of the device is shown in FIG. The high pressure pump used a pump capable of outputting up to 100 bar, and the nanobubbling device was injected by generating nano-sized bubbles using CO 2 . SWRO membrane is voltron SW21-4040 and membrane filtration area is 7.4m 2 . The characteristics of the SWRO membrane used are shown in Table 1.
The operation of the experimental apparatus was operated in consideration of the dissolution of CO 2 by constantly introducing 120 L of concentrated water of the 1-stage SWRO membrane into the nanobubbling apparatus.
1-2: Experimental Method
As schematically shown in FIG. 2, the concentrated water undergoing the first reverse osmosis process was subjected to a crystallization process. In the crystallization process, the temperature of the influent was fixed at 25 ° C., the CO 2 inflow was 9.3 L / min, and the pH was adjusted to 9.6 using 1N Ca (OH) 2 .
The crystallized crystals were added at a concentration of 0.37 wt% to the final discharge water of the sewage treatment plant and adjusted to pH 10.00 ~ 10.10 to measure the phosphorus removal rate over time, and the results are shown in Table 2.
As shown in Table 2, the crystals discarded in the SWRO process was continuously injected into the raw water, and as a result, it was confirmed that the phosphorus removal rate was decreased due to the pH drop over time, but the phosphorus removal was efficiently adjusted due to the pH adjustment. Was able to confirm the occurrence.
While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It is therefore to be understood that the embodiments described above are in all respects illustrative and not restrictive.
Claims (6)
The crystals obtained by reverse osmosis of seawater using a reverse osmosis membrane, and then crystallized by adjusting the pH of the concentrated water that did not pass through the reverse osmosis membrane, CaCO 3 , and MgCO 3 ,
The crystallization process is performed by adjusting the pH of the concentrated water to the region 9.0 ~ 10.5 and supplying CO 2 to the nanobubbling device, phosphorus in the sewage using the crystals generated in the seawater desalination process using a reverse osmosis membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100124950A KR101309565B1 (en) | 2010-12-08 | 2010-12-08 | Method for Removing Phosphorus in wastewater Using Crystal from P-C SWRO system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100124950A KR101309565B1 (en) | 2010-12-08 | 2010-12-08 | Method for Removing Phosphorus in wastewater Using Crystal from P-C SWRO system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20120063805A KR20120063805A (en) | 2012-06-18 |
| KR101309565B1 true KR101309565B1 (en) | 2013-09-17 |
Family
ID=46684131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020100124950A KR101309565B1 (en) | 2010-12-08 | 2010-12-08 | Method for Removing Phosphorus in wastewater Using Crystal from P-C SWRO system |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR101309565B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10219670B2 (en) | 2014-09-05 | 2019-03-05 | Tennant Company | Systems and methods for supplying treatment liquids having nanobubbles |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002000551A2 (en) | 2000-06-29 | 2002-01-03 | Israel Garden | A process and apparatus for brine purification |
| KR20050114619A (en) * | 2003-02-12 | 2005-12-06 | 니폰 가가쿠 고교 가부시키가이샤 | Method for removing phosphorus in wastewater |
| US20060105082A1 (en) * | 2004-11-18 | 2006-05-18 | Zeigler Arthur W | Method of producing useful products from seawater and similar brines |
| KR20100096820A (en) * | 2009-02-25 | 2010-09-02 | 현대제철 주식회사 | Method for treating waste water contained high concentration phosphorus |
-
2010
- 2010-12-08 KR KR1020100124950A patent/KR101309565B1/en active IP Right Grant
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002000551A2 (en) | 2000-06-29 | 2002-01-03 | Israel Garden | A process and apparatus for brine purification |
| KR20050114619A (en) * | 2003-02-12 | 2005-12-06 | 니폰 가가쿠 고교 가부시키가이샤 | Method for removing phosphorus in wastewater |
| US20060105082A1 (en) * | 2004-11-18 | 2006-05-18 | Zeigler Arthur W | Method of producing useful products from seawater and similar brines |
| KR20100096820A (en) * | 2009-02-25 | 2010-09-02 | 현대제철 주식회사 | Method for treating waste water contained high concentration phosphorus |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20120063805A (en) | 2012-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | Intermediate concentrate demineralization techniques for enhanced brackish water reverse osmosis water recovery–A review | |
| Ghernaout | Brine recycling: towards membrane processes as the best available technology | |
| Huang et al. | Advanced treatment of wastewater from an iron and steel enterprise by a constructed wetland/ultrafiltration/reverse osmosis process | |
| CN104276711A (en) | Reverse osmosis membrane treatment process for recycling industrial sewage and realizing zero release | |
| US8623214B2 (en) | Desalination system and method for integrated treatment of brackish concentrate and seawater | |
| US20140014584A1 (en) | Wastewater purification system and method | |
| US8696908B2 (en) | Desalination system and method of wastewater treatment | |
| JP2014014738A (en) | Method and apparatus for treating organic wastewater | |
| KR101360020B1 (en) | Preprocessing of membrane filtration and system using the same | |
| KR101530571B1 (en) | A desalination of cooling tower make-up water and effluent recycling system | |
| CN105084587A (en) | Treatment method and equipment of high-salt waste water | |
| CN105439341A (en) | Salt-containing wastewater treatment system and treatment method | |
| CN104108813A (en) | Refining and chemical sewage desalting integrated treatment process and device | |
| Song et al. | Nanofiltration desalination of reverse osmosis concentrate pretreated by advanced oxidation with ultrafiltration: Response surface optimization and exploration of membrane fouling | |
| Pariente et al. | Wastewater treatment as a process and a resource | |
| Elfilali et al. | Performances of various hybrids systems coagulation–ultrafiltration/nanofiltration-reverse osmosis in the treatment of stabilized landfill leachate | |
| KR101360015B1 (en) | Method of reusing treated wastewater and system using the same | |
| KR101309565B1 (en) | Method for Removing Phosphorus in wastewater Using Crystal from P-C SWRO system | |
| US20080029456A1 (en) | Method and apparatus for removing minerals from a water source | |
| Li et al. | Review of disposal of concentrate streams from nanofiltration (NF) or reverse osmosis (RO) membrane process | |
| Asadi et al. | An investigation on boiler feed water treatment using reverse osmosis and ion exchange by WAVE software | |
| TOPAL et al. | Reverse osmosis treatment system for landfill leachate: Operation conditions, advantages and challenges | |
| KR101781503B1 (en) | Multi-effect distillator with partial acid dosing and desalination method using the same | |
| Lozier et al. | The Oxnard advanced water purification facility: combining indirect potable reuse with reverse osmosis concentrate beneficial use to ensure a California community's water sustainability and provide coastal wetlands restoration | |
| Hobbs et al. | Concentrate management: weigh benefits and drawbacks to ensure success |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| AMND | Amendment | ||
| E601 | Decision to refuse application | ||
| AMND | Amendment | ||
| X701 | Decision to grant (after re-examination) | ||
| GRNT | Written decision to grant | ||
| FPAY | Annual fee payment |
Payment date: 20160805 Year of fee payment: 4 |
|
| FPAY | Annual fee payment |
Payment date: 20170711 Year of fee payment: 5 |
|
| FPAY | Annual fee payment |
Payment date: 20180801 Year of fee payment: 6 |
|
| FPAY | Annual fee payment |
Payment date: 20190731 Year of fee payment: 7 |