CN219279690U - Landfill leachate softens processing apparatus - Google Patents
Landfill leachate softens processing apparatus Download PDFInfo
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- CN219279690U CN219279690U CN202320363981.0U CN202320363981U CN219279690U CN 219279690 U CN219279690 U CN 219279690U CN 202320363981 U CN202320363981 U CN 202320363981U CN 219279690 U CN219279690 U CN 219279690U
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Abstract
The utility model relates to a landfill leachate softening treatment device, and belongs to the technical field of landfill leachate treatment. Comprises a lime milk reaction tank, a sodium carbonate reaction tank, a buffer tank, a sedimentation tank, a booster pump, a PTFE hollow fiber membrane group, a back flushing unit, a chemical cleaning unit and corresponding pipelines and valves. The method can effectively remove calcium and magnesium ions in the landfill leachate, reduce the hardness of the landfill leachate, solve the problem of scaling on the concentrate side of a subsequent membrane advanced treatment system, and improve the water yield; the garbage leachate is softened by using sedimentation and PTFE hollow fiber membrane filtration, calcium and magnesium ion precipitates with larger particle size are removed by sedimentation, fine particles with poor sedimentation performance are filtered by PTFE hollow fiber membranes, the water quality of the effluent is good, no additional flocculant is needed, the sludge is small, the PTFE hollow fiber membranes are used for filtration, the surfaces of the membranes are not easy to adsorb impurities, and the system is resistant to pollution and chemical corrosion, long in service life and stable in operation.
Description
Technical Field
The utility model relates to a landfill leachate softening treatment device, and belongs to the technical field of landfill leachate treatment.
Background
The garbage percolate is sewage generated by various physical, biological and chemical actions in the process of stacking and landfill garbage and under the seepage action of precipitation and other external incoming water, the sewage has complex components, high concentration of organic matters and ammonia nitrogen and contains a large amount of calcium and magnesium ions, groundwater and surface water can be seriously polluted if the sewage is not treated, and serious harm is caused to ecological environment and human society. According to the technical specifications of domestic garbage leachate treatment (CJJ 150-2010) and domestic garbage landfill leachate treatment engineering (trial) (HJ 564-2010), the main stream garbage leachate treatment process in China is currently in the form of pretreatment, biological treatment and advanced treatment and is mainly expressed as a combined process of a Membrane Bioreactor (MBR) +a double membrane method (NF/RO). However, due to the high content of calcium and magnesium in the landfill leachate and the long-term recharging of the filtration concentrate generated by the membrane system, calcium and magnesium ions in the landfill leachate are continuously enriched, scaling in the membrane system is caused, and finally, the water yield of the system is reduced and the service life of the membrane is shortened. Therefore, the use of "Membrane Bioreactor (MBR) +double membrane method (NF/RO)" to treat landfill leachate is urgent for developing a softening treatment device for landfill leachate.
Disclosure of Invention
The utility model provides a landfill leachate softening treatment device, which aims to solve the problem that the concentration of calcium and magnesium ions is too high before advanced treatment of a landfill leachate membrane so as to ensure the stable operation of a landfill leachate treatment system and prolong the service life of the system. After pretreatment and Membrane Bioreactor (MBR) treatment, the landfill leachate enters a landfill leachate softening treatment device to remove calcium and magnesium ions in the landfill leachate, and then advanced treatment is carried out by adopting a double-membrane method.
The technical scheme adopted by the utility model is as follows:
the garbage leachate softening treatment device comprises a lime milk reaction tank, a sodium carbonate reaction tank, a buffer tank, a sedimentation tank, a booster pump, a PTFE hollow fiber membrane group, a back flushing unit and a chemical cleaning unit, wherein the lime milk reaction tank is communicated with the sodium carbonate reaction tank through a bottom connecting hole, a water outlet of the sodium carbonate reaction tank is connected with a water inlet of the buffer tank through a pipeline, the buffer tank is communicated with the sedimentation tank through a bottom connecting hole, and a water outlet of the sedimentation tank is connected with a water inlet pipe of the PTFE hollow fiber membrane group through the booster pump; the back flushing unit comprises a back flushing water tank and a back flushing pump which are sequentially connected, and a water outlet of the back flushing pump is connected with a back flushing pipe of the PTFE hollow fiber membrane group; the chemical cleaning unit comprises a cleaning liquid storage tank and a chemical cleaning pump which are sequentially connected, and a water outlet of the chemical cleaning pump is connected with a chemical cleaning pipe of the PTFE hollow fiber membrane group.
Further, stirring devices are arranged in the lime milk reaction tank and the sodium carbonate reaction tank, and an online pH meter is also arranged in the lime milk reaction tank.
Further, the PTFE hollow fiber membrane group consists of a plurality of PTFE hollow fiber membranes which are connected in parallel, PTFE hollow fiber membrane wires with the filtering precision of 0.1 mu m are filled in the PTFE hollow fiber membrane group, a concentrated water pipe and a backwashing water drain pipe of the PTFE hollow fiber membrane group are connected into the buffer pool, and a cleaning fluid return pipe of the PTFE hollow fiber membrane group is connected into the cleaning fluid storage tank, so that cleaning fluid is returned.
Further, a water producing pipe of the PTFE hollow fiber membrane group is connected into the back flushing water tank, the back flushing water tank is provided with an overflow port, and softened produced water treated by the garbage leachate softening treatment device is discharged from the overflow port.
The device has the following advantages:
the method can effectively remove calcium and magnesium ions in the landfill leachate, reduce the hardness of the landfill leachate, solve the problem of scale formation on the concentrate side of a subsequent membrane advanced treatment system, improve the water yield, ensure the stability of the membrane advanced treatment system and prolong the service life of the membrane advanced treatment system.
According to the utility model, the garbage leachate is softened by using sedimentation and PTFE hollow fiber membrane filtration, calcium and magnesium ion precipitates with larger particle size are removed by sedimentation, fine particles with poor sedimentation performance are filtered by PTFE hollow fiber membranes, the effluent quality is good, no additional flocculant is needed, the sludge amount is small, and adverse effects of residual flocculant on subsequent nanofiltration membranes and ultrafiltration membranes are avoided.
The utility model uses PTFE hollow fiber membrane to filter, which is beneficial to the excellent surface property and chemical property of PTFE material, the surface of the membrane is not easy to adsorb impurities, and the membrane is pollution-resistant and chemical corrosion-resistant and has long service life.
Drawings
FIG. 1 is a schematic diagram of a garbage leachate softening treatment device.
Wherein: 1. lime milk reaction tank, sodium carbonate reaction tank, buffer tank, sedimentation tank, booster pump, PTFE hollow fiber membrane group, back flush water tank, back flush pump, cleaning liquid storage tank and cleaning liquid storage tank the system comprises a chemical cleaning pump 10, a water inlet pipe 11, a water production pipe 12, a concentrated water pipe 13, a backwash drain pipe 14, a backwash pipe 15, a chemical cleaning pipe 16, a cleaning liquid return pipe 17 and an online pH meter 101.
Detailed Description
The garbage leachate softening treatment device is shown in the attached figure 1, and comprises: the device is formed by connecting a lime milk reaction tank 1, a sodium carbonate reaction tank 2, a buffer tank 3, a sedimentation tank 4, a booster pump 5, a PTFE hollow fiber membrane group 6, a back flushing unit, a chemical cleaning unit and corresponding pipelines and valves.
The lime milk reaction tank 1 is communicated with the sodium carbonate reaction tank 2 through a bottom connecting hole, a stirring device is arranged in the lime milk reaction tank 1 and the sodium carbonate reaction tank 2, in addition, an online pH meter 101 is further arranged in the lime milk reaction tank 1, the sodium carbonate reaction tank 2 is connected with the buffer tank 3 through a pipeline, and the buffer tank 3 is communicated with the sedimentation tank 4 through a bottom connecting hole.
The PTFE hollow fiber membrane group 6 is provided with a water inlet pipe 11, a water production pipe 12, a concentrated water pipe 13, a backwashing water drain pipe 14, a backwashing pipe 15, a chemical cleaning pipe 16 and a cleaning liquid return pipe 17, the sedimentation tank 4 is connected with the water inlet pipe 11 through the booster pump 5, and the concentrated water pipe 13 and the backwashing water drain pipe 14 are connected into the buffer tank 3, so that concentrated water generated by filtration flows back to the buffer tank 3.
The back flush unit comprises a back flush water tank 7 and a back flush pump 8 which are sequentially connected, a water outlet of the back flush pump 8 is connected with a back flush pipe 15 of the PTFE hollow fiber membrane group 6, a water production pipe 12 of the PTFE hollow fiber membrane group 6 is connected into the back flush water tank 7, and in addition, the back flush water tank 7 is provided with an overflow port, so that softened water produced after being treated by the garbage leachate softening treatment device is discharged and enters a subsequent advanced treatment system.
The chemical cleaning unit comprises a cleaning liquid storage tank 9 and a chemical cleaning pump 10 which are sequentially connected, a water outlet of the chemical cleaning pump 10 is connected with a chemical cleaning pipe 16 of the PTFE hollow fiber membrane group 6, and a cleaning liquid return pipe 17 of the PTFE hollow fiber membrane group 6 is connected with the cleaning liquid storage tank 9, so that cleaning liquid flows back to the cleaning liquid storage tank 9.
When the normal treatment works, all valves are closed at first, and only the valves on the water inlet pipe 11, the water producing pipe 12 and the concentrated water pipe 13 are opened; firstly, the garbage percolate treated by MBR enters the lime milk reaction tank 1, lime milk is added into the lime milk reaction tank 1, the pH value of the garbage percolate is regulated to 11.5, carbonate hardness in the garbage percolate is removed, then the garbage percolate automatically flows into the sodium carbonate reaction tank 2 through a connecting hole at the bottom of the lime milk reaction tank 1, the garbage percolate reacts with sodium carbonate in the sodium carbonate reaction tank 2, non-carbonate hardness in the garbage percolate is removed, the garbage percolate automatically flows into the buffer tank 3 through gravity, then reaches the sedimentation tank 4 through a connecting hole at the bottom of the buffer tank 3, large-particle calcium-magnesium ion sediment in the garbage percolate is removed through sedimentation in the sedimentation tank 4, small suspended particles which are not easy to sediment enter the PTFE hollow fiber membrane group 6 along with the supernatant liquid after being pressurized by the booster pump 5, concentrated water generated by filtering of the PTFE hollow fiber membrane group 6 flows back to the buffer tank 3 through a concentrated water pipe 13 for circulating treatment, and the generated softened water enters the backwash water tank 7 through the water production pipe 12, and then enters a backwash water tank 7 through a subsequent backwash water tank deep treatment system.
When the back washing works, all valves are closed at first, and only the valves on the back washing drain pipe 14 and the back washing pipe 15 are opened; and softened water generated by filtering the PTFE hollow fiber membrane group 6 is used as backwash water, the backwash water enters the PTFE hollow fiber membrane group 6 from the backwash pipe 15 after being pressurized by the backwash pump 8 from the backwash water tank 7, and reaches the surface of membrane wires from the inside of the membrane wires through pores on the surface of the membrane wires so as to remove pollutants in membrane holes, and sewage generated after backwashing is discharged to the buffer tank 3 from the discharge port 14.
When chemical cleaning is performed, all valves are closed firstly, and only the valves on the chemical cleaning pipe 16 and the cleaning liquid return pipe 17 are opened; the cleaning solution flows out of the cleaning solution storage tank 9, is pressurized by the chemical cleaning pump 10, enters the PTFE hollow fiber membrane group 6 from the chemical cleaning pipe 16, flows back to the cleaning solution storage tank 9 from the cleaning solution return pipe 17, and is subjected to repeated circulating cleaning to remove scale formed on the surface of the membrane wire.
Claims (5)
1. A landfill leachate softens processing apparatus, its characterized in that: comprises a lime milk reaction tank (1), a sodium carbonate reaction tank (2), a buffer tank (3), a sedimentation tank (4), a booster pump (5), a PTFE hollow fiber membrane group (6) and a back flushing unit; the lime milk reaction tank (1) is communicated with the sodium carbonate reaction tank (2) through a bottom connecting hole, a water outlet of the sodium carbonate reaction tank (2) is connected with a water inlet of the buffer tank (3) through a pipeline, and the buffer tank (3) is communicated with the sedimentation tank (4) through a bottom connecting hole;
the back flushing unit comprises a back flushing water tank (7) and a back flushing pump (8) which are sequentially connected;
the PTFE hollow fiber membrane group (6) is provided with a water inlet pipe (11), a water producing pipe (12), a concentrated water pipe (13), a backwashing water outlet pipe (14) and a backwashing pipe (15);
the water outlet of the sedimentation tank (4) is connected with a water inlet pipe (11) of the PTFE hollow fiber membrane group (6) through the booster pump (5);
a water producing pipe (12) of the PTFE hollow fiber membrane group (6) is connected into the back flushing water tank (7);
a concentrate pipe (13) and a backwash drain pipe (14) of the PTFE hollow fiber membrane group (6) are connected into the buffer tank (3);
the water outlet of the back flushing pump (8) is connected with a back flushing pipe (15) of the PTFE hollow fiber membrane group (6).
2. A landfill leachate softening treatment device according to claim 1, wherein: the chemical cleaning unit is also included; the PTFE hollow fiber membrane group (6) is also provided with a chemical cleaning pipe (16) and a cleaning liquid return pipe (17); the chemical cleaning unit comprises a cleaning liquid storage tank (9) and a chemical cleaning pump (10) which are sequentially connected, and a water outlet of the chemical cleaning pump (10) is connected with a chemical cleaning pipe (16) of the PTFE hollow fiber membrane group (6); and a cleaning solution return pipe (17) of the PTFE hollow fiber membrane group (6) is connected into the cleaning solution storage tank (9) to enable the cleaning solution to return.
3. A landfill leachate softening treatment device according to claim 1, wherein: stirring devices are arranged in the lime milk reaction tank (1) and the sodium carbonate reaction tank (2), and an online pH meter (101) is arranged in the lime milk reaction tank (1).
4. A landfill leachate softening treatment device according to claim 1, wherein: the PTFE hollow fiber membrane group (6) consists of a plurality of PTFE hollow fiber membranes which are connected in parallel, and PTFE hollow fiber membrane wires with the filtering precision of 0.1 mu m are filled in the PTFE hollow fiber membrane group.
5. A landfill leachate softening treatment device according to claim 1, wherein: the back flushing water tank (7) is provided with an overflow port, and the treated softened produced water is discharged from the overflow port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320363981.0U CN219279690U (en) | 2023-03-02 | 2023-03-02 | Landfill leachate softens processing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320363981.0U CN219279690U (en) | 2023-03-02 | 2023-03-02 | Landfill leachate softens processing apparatus |
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| Publication Number | Publication Date |
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| CN219279690U true CN219279690U (en) | 2023-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320363981.0U Active CN219279690U (en) | 2023-03-02 | 2023-03-02 | Landfill leachate softens processing apparatus |
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2023
- 2023-03-02 CN CN202320363981.0U patent/CN219279690U/en active Active
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