CN203007053U - Wastewater recycling system - Google Patents
Wastewater recycling system Download PDFInfo
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- CN203007053U CN203007053U CN2012207500211U CN201220750021U CN203007053U CN 203007053 U CN203007053 U CN 203007053U CN 2012207500211 U CN2012207500211 U CN 2012207500211U CN 201220750021 U CN201220750021 U CN 201220750021U CN 203007053 U CN203007053 U CN 203007053U
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- 239000002351 wastewater Substances 0.000 title claims abstract description 87
- 238000004064 recycling Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 283
- 238000004062 sedimentation Methods 0.000 claims abstract description 101
- 238000004519 manufacturing process Methods 0.000 claims abstract description 25
- 235000012431 wafers Nutrition 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims description 74
- 238000003860 storage Methods 0.000 claims description 33
- 238000001914 filtration Methods 0.000 claims description 27
- 238000011045 prefiltration Methods 0.000 claims description 26
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 22
- 239000010865 sewage Substances 0.000 claims description 11
- 238000011001 backwashing Methods 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 18
- 229910052710 silicon Inorganic materials 0.000 abstract description 18
- 239000010703 silicon Substances 0.000 abstract description 18
- 239000013078 crystal Substances 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 10
- 125000004122 cyclic group Chemical group 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 239000008213 purified water Substances 0.000 description 4
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000008400 supply water Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
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- 238000012351 Integrated analysis Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
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- 239000010802 sludge Substances 0.000 description 1
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Filtration Of Liquid (AREA)
Abstract
The utility model provides a wastewater recycling system. The wastewater recycling system comprises a primary sedimentation pool, a secondary sedimentation pool and a filter which are sequentially connected in series; the primary sedimentation pool is provided with a primary wastewater receiving port and a primary sedimentation pool outlet, wherein the primary wastewater receiving port is connected with a wastewater outlet of a medium-quality water consumption link and a wastewater outlet of a low-quality water consumption link, and the primary sedimentation pool outlet is used for draining sedimentation wastewater; the secondary sedimentation pool is provided with a secondary sedimentation pool inlet and a secondary wastewater receiving port, wherein the secondary sedimentation pool inlet is connected with the primary sedimentation pool outlet; and a high-quality water consumption link, the medium-quality water consumption link and the low-quality water consumption link are divided according to the requirements of all the water consumption links on water quality in a manufacturing process of mono/poly-crystal silicon wafers. According to the wastewater recycling system provided by the utility model, wastewater produced in the manufacturing process of the mono/poly-crystal silicon wafers is recovered and processed and then is applied to the manufacturing process, so that the consumption of running water in the manufacturing process is reduced.
Description
Technical Field
The utility model relates to a silicon chip field of making especially relates to a waste water cyclic utilization system.
Background
In the field of solar cell production, a solar cell made of a single polycrystalline silicon wafer serving as a substrate is always a mainstream product in the photovoltaic market, while a single polycrystalline silicon wafer production link in the whole crystalline silicon solar cell industrial chain is absolutely a large water consumer, and under the large background of energy conservation and emission reduction advocated by the state, how to greatly reduce the unit consumption of water resources on the premise of ensuring the normal operation of production processes and equipment is an urgent problem to be solved.
At present, the production links of single polycrystalline silicon blocks and silicon wafers in the industry are basically realized by utilizing a multi-wire cutting mode, namely, a steel wire running at a high speed carries mortar containing SiC particles to cut a silicon ingot into silicon blocks and cut the silicon blocks into the silicon wafers, the surfaces of the cut silicon blocks and silicon wafers are conceivably full of the mortar, so that subsequent processing is required, a large amount of water is needed for spraying and washing, the silicon blocks and silicon wafers full of the mortar are pretreated, and the water consumption is extremely high.
Meanwhile, in the silicon block grinding chamfering and band saw links, a large amount of water is also needed for cooling the knife edge. In the prior art, tap water is mainly used as the water, so that the consumption of the tap water is large.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a waste water cyclic utilization system to reduce the problem that single polycrystalline silicon chip made and need consumed a large amount of running water among the prior art.
In order to achieve the above object, the utility model provides a waste water cyclic utilization system is applied to single polycrystalline silicon chip and makes, and this system includes: a first-stage sedimentation tank; a second-stage sedimentation tank; a filter; wherein, the first-stage sedimentation tank, the second-stage sedimentation tank and the filter are connected in series in sequence; the first-stage sedimentation tank is provided with a first-stage waste water receiving opening connected with waste water outlets of a medium water quality water using link and a low water quality water using link and a first-stage sedimentation tank outlet for discharging the precipitated waste water; the second-stage sedimentation tank is provided with a second-stage sedimentation tank inlet connected with the first-stage sedimentation tank outlet and a second-stage waste water receiving port connected with a waste water outlet of the high-quality water consumption link; the high-quality water using link, the medium-quality water using link and the low-quality water using link are divided according to the requirements of the water using links on the water quality in the manufacturing process of the single polycrystalline silicon chip.
Furthermore, the first-stage sedimentation tank and the second-stage sedimentation tank are horizontal flow type sedimentation tanks.
Further, the filter is a sand filter.
Further, the utility model provides a system still includes: pump before straining, straining back aqua storage tank, booster pump and overhead tank, wherein: the second-stage sedimentation tank is connected with the filter through a pre-filtration pump, the input end of the pre-filtration pump is connected with the second-stage sedimentation tank, and the output end of the pre-filtration pump is connected with the filter; a filtered water storage tank is arranged between the filter and the pressure tank and used for storing water filtered by the filter; the filtered water storage tank is connected with the pressure tank through a booster pump, the input end of the booster pump is connected with the filtered water storage tank, and the output end of the booster pump is connected with the input end of the pressure tank; the output end of the pressure tank is connected with the water supply input end of the medium water quality water consumption link and the low water quality water consumption link.
Furthermore, the system provided by the utility model also comprises a controller, three liquid level sensors of a first high liquid level sensor, a first middle liquid level sensor and a first low liquid level sensor are arranged in the filtered water storage tank from high to low, wherein the controller is respectively connected with the first high liquid level sensor and the pre-filtering pump and is used for stopping the pre-filtering pump when the liquid level reaches the first high liquid level sensor; the controller is respectively connected with the first middle liquid level sensor and the booster pump and is used for starting the booster pump when the liquid level reaches the first middle liquid level sensor; the controller is respectively connected with the first low liquid level sensor and the booster pump and is used for stopping the booster pump when the liquid level is lower than the first low liquid level sensor.
Further, the system provided by the utility model also comprises a first three-way valve; the booster pump and the pressure tank are respectively connected to two ends of a first three-way valve, and the third end of the first three-way valve is connected with a backwashing water path of the filter.
Furthermore, a backwashing sewage discharge outlet of the filter is connected with an inlet of the first-stage sedimentation tank.
Furthermore, the system provided by the utility model also comprises a second three-way valve, a pre-filtration water storage tank and a controller, wherein the first end of the second three-way valve is connected with the wastewater outlet of the medium water quality water consumption link and the low water quality water consumption link, the second end is connected with a sewage pipe network, and the third end is connected with the inlet of the first sedimentation tank; the pre-filtration water storage tank is connected with the second-stage sedimentation tank through an overflow weir, a second high liquid level sensor, a second medium liquid level sensor and a second low liquid level sensor are arranged in the pre-filtration water storage tank from high to low, wherein the controller is respectively connected with the second high liquid level sensor and a second three-way valve and is used for controlling the second three-way valve to switch the wastewater in a medium water quality water using link and a low water quality water using link between a sewage pipe network and the inlet of the first sedimentation tank when the liquid level reaches the second high liquid level sensor; the controller is respectively connected with the second middle liquid level sensor and the pre-filtering pump and is also used for starting the pre-filtering pump when the liquid level reaches the second middle liquid level sensor; the controller is respectively connected with the second low liquid level sensor and the pre-filtering pump and used for stopping the pre-filtering pump when the liquid level is lower than the second low liquid level sensor.
Furthermore, a through hole is formed in the overflow weir, a valve is installed on the through hole, and the height of the through hole is the same as or lower than that of the second middle liquid level sensor in the water storage tank before filtration.
Further, the through hole and the valve are one or more, and the valve is a manual gate valve.
The utility model provides a waste water cyclic utilization system is applied to single polycrystalline silicon chip and makes, and this system includes: a first-stage sedimentation tank; a second-stage sedimentation tank; a filter; wherein the first-stage sedimentation tank, the second-stage sedimentation tank and the filter are sequentially connected in series; the first-stage sedimentation tank and the second-stage sedimentation tank are used for treating wastewater in a medium water quality water using link and a low water quality water using link; the second-stage sedimentation tank is also used for treating wastewater in a water consumption link with high water quality; the high-quality water using link, the medium-quality water using link and the low-quality water using link are divided according to the requirements of the water using links on the water quality in the manufacturing process of the single polycrystalline silicon chip. The utility model provides a waste water cyclic utilization system utilizes first order sedimentation tank and second level sedimentation tank to retrieve and be applied to this manufacturing process after handling the waste water in the polycrystalline silicon chip manufacturing process, makes medium quality of water link and low grade quality of water link wherein need not additionally to use the running water, has reduced the running water consumption in the polycrystalline silicon chip manufacturing process. The embodiment of the utility model provides an in waste water cyclic utilization system's water treatment cost is also lower to but long-term automatic stabilization moves, to next generation buddha's warrior attendant wire-electrode cutting manufacturing process, this system still is very suitable for moreover, need not upgrade and reform transform.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. Embodiments of the present invention will be described below by way of example with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a schematic diagram of the basic principles of a wastewater recycling system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a preferred configuration of a wastewater recycling system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a sand filter backwash procedure according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a control flow of the wastewater recycling system in the water consumption state in the middle water quality consumption stage and the low water quality consumption stage according to the embodiment of the present invention; and
fig. 5 is a schematic diagram of a control flow of the wastewater recycling system in the middle water quality water consumption link and the low water quality water consumption link in the water use stop state according to the embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
In the embodiment of the utility model, according to the requirement of each water consumption link on water quality in the manufacturing process of the single-polycrystalline silicon chip, the water consumption links are divided into a high water quality water consumption link, a medium water quality water consumption link and a low water quality water consumption link; the waste water discharged from the high-quality water using link is purified and then used as water for the medium-quality water using link and the low-quality water using link, so that the waste water discharged from the high-quality water using link can be better utilized, and the consumption of tap water in the medium-quality water using link and the low-quality water using link is reduced. If the water consumption of the medium water quality water using link and the low water quality water using link is larger, the waste water discharged from the two links can be purified and then used as the water for the two links, which is also beneficial to reducing the tap water consumption of the two links.
In the actual manufacturing process of the single polycrystalline silicon wafer, the pre-washing step of the single polycrystalline silicon wafer obtained by cutting the silicon block is mainly to pre-wash the silicon wafer which is full of mortar, and water used at the moment is allowed to contain a small amount of micro particles, so that the step can be regarded as a low-grade water quality water using step; in the link of cooling the single polycrystalline silicon block by water during shape and surface processing, more soluble substances are allowed, so that the link can be regarded as a medium water quality water using link; when the single polycrystalline silicon wafer is cleaned after being processed, deionized water is needed, and the requirement on water quality is quite high, so that the link can be regarded as a high-quality water consumption link. When deionized water is used to clean single-poly silicon wafers, a multi-tank ultrasonic silicon wafer cleaning machine having a pre-rinse tank, a chemical liquid rinse tank, and a fine rinse tank is generally used. In this embodiment, only the wastewater discharged from the pre-rinse tank and the final rinse tank is purified.
When the wastewater discharged from the water using link is purified, only primary precipitation is carried out on the wastewater discharged from the water using link with high water quality, and then filtration is carried out; when the wastewater discharged from the medium water quality water using link and the low water quality water using link is treated, secondary precipitation is carried out, and then filtration is carried out. The filtration can share one filtration device, and the primary sedimentation can adopt a secondary sedimentation tank in the secondary sedimentation. With particular reference to fig. 1, fig. 1 is a schematic diagram of the basic principles of a wastewater recycling system according to an embodiment of the present invention.
As shown in fig. 1, the wastewater recycling system of the embodiment of the present invention includes a first-stage sedimentation tank 11, a second-stage sedimentation tank 12, and a filter 13, which are connected in series in sequence. The first-stage sedimentation tank 11 is provided with a first-stage waste water receiving opening of a medium water quality water consumption link and a low water quality water consumption link which are connected with a waste water outlet A of the medium water quality water consumption link and the low water quality water consumption link, and a first-stage sedimentation tank outlet for discharging the precipitated waste water; the second-stage sedimentation tank 12 is provided with a second-stage sedimentation tank inlet connected with the outlet of the first-stage sedimentation tank and a high-quality water consumption link waste water receiving port connected with a waste water outlet B of the high-quality water consumption link; the wastewater in the medium water quality water using link and the low water quality water using link in the manufacturing process of the single polycrystalline silicon wafer is discharged into the first-stage sedimentation tank 11 through the wastewater outlet A, and enters the second-stage sedimentation tank 12 after being subjected to sedimentation treatment in the first-stage sedimentation tank 11, so that secondary sedimentation is completed. The wastewater in the high-quality water using link is directly discharged into the second-stage sedimentation tank 12 through the wastewater outlet B, namely, only the first-stage sedimentation is carried out. The water filtered by the filter 13 can be used as water for a medium water quality water using link and a low water quality water using link through the water outlet C and the water outlet D. Can find out to adopt the utility model discloses waste water cyclic utilization system can effectively utilize the waste water of each link exhaust in the single polycrystalline silicon chip manufacture process, reduces the running water use amount of medium quality of water link and low grade quality of water link wherein.
Fig. 2 is a schematic diagram of a preferred structure of a wastewater recycling system according to an embodiment of the present invention. As shown in fig. 2, the first-stage sedimentation tank 11, the second-stage sedimentation tank 12, the filter 13, the first-stage sedimentation tank 11 and the second-stage sedimentation tank 12 may be both horizontal-flow sedimentation tanks, and the wastewater in the medium-quality water consumption stage and the low-quality water consumption stage is introduced from the wastewater outlet a by the second three-way valve 111, passes through the coarse strainer 112, and then enters the water inlet tank 113 of the first-stage sedimentation tank 11 (equivalent to the first-stage wastewater receiving port of the first-stage sedimentation tank 11), or is directly discharged into the sewage pipe network W under the condition that the water consumption in the medium-quality water consumption stage and the low-quality water consumption stage is sufficient. Because the waste water quality of the medium water quality water consumption link and the low water quality water consumption link is poor and the contained impurities are easy to precipitate, the confluence pipeline or channel needs to be designed and constructed by adopting a larger gradient.
The wastewater discharged from the advanced water quality stage directly enters the second-stage sedimentation tank 12 from the wastewater outlet B via the coarse screen 121 (equivalent to the wastewater receiving port of the advanced water quality stage of the second-stage sedimentation tank 12). The water in the first-stage sedimentation tank 11 can enter the second-stage sedimentation tank 12 in an overflow mode (equivalent to the outlet of the first-stage sedimentation tank 11 and the inlet of the second-stage sedimentation tank 12). The serial distribution mode of the first-stage sedimentation tank 11 and the second-stage sedimentation tank 12 enables most of impurities in wastewater from a medium water quality water consumption link and a low water quality water consumption link to be precipitated after two-stage precipitation, and the first-stage sedimentation tank 11 and the second-stage sedimentation tank 12 can be flexibly used as a backup for each other. The top of the first-stage sedimentation tank 11 and the second-stage sedimentation tank 12 are respectively provided with a mud scraper 114 and a mud scraper 122, the inside of the first-stage sedimentation tank is respectively provided with a mud scraper 115 and a mud scraper 123, and the bottom of the first-stage sedimentation tank is respectively provided with a mud storage hopper 116 and a mud storage hopper 124. Thus, the settled silt can be conveniently collected to the silt storage hopper and then pumped away by the sludge pump 14.
The wastewater after the two-stage sedimentation treatment enters the pre-filtration water storage tank 15 through an overflow weir 151 between the second-stage sedimentation tank 12 and the pre-filtration water storage tank 15. The primary function of the pre-filter reservoir 15 is to hold water for the pre-filter pump 16 and the filter 13. A second high level sensor 152, a second mid level sensor 153 and a second low level sensor 154 are disposed in the pre-filter reservoir 15. In practice, the system also comprises a controller connected to the first high level sensor 191 and to the pre-filtration pump 16, respectively, for stopping the pre-filtration pump 16 when the liquid level reaches the first high level sensor 191; the controller is respectively connected with the first middle liquid level sensor 192 and the booster pump 17 and is used for starting the booster pump 17 when the liquid level reaches the first middle liquid level sensor 192; the controller is connected to the first low level sensor 193 and the pressurizing pump 17, respectively, for stopping the pressurizing pump 17 when the liquid level is lower than the first low level sensor 193.
The second high liquid level sensor 152 is used to control the second three-way valve 111, that is, when the liquid level of the pre-filtration water storage tank 15 reaches a high liquid level, a signal is sent out, and a control system (not shown in the figure) connected to each liquid level sensor, the water pump and the valve controls the second three-way valve 111 to discharge the wastewater from the medium water quality water using link and the low water quality water using link to the sewage pipe network W according to the signal. When the second mid-level sensor 153 signals, the pre-filter pump 16 begins pumping water into the filter 13. When the second low level sensor 154 signals, the pre-filter pump 16 stops operating, preventing evacuation. The second-stage sedimentation tank 12 is connected with the filter 13 through a pre-filtering pump 16, the input end of the pre-filtering pump 16 is connected with the second-stage sedimentation tank 12, and the output end of the pre-filtering pump 16 is connected with the filter 13; a filtered water storage tank 19 is arranged between the filter 13 and the pressure tank 18 and is used for storing water filtered by the filter 13; the filtered water storage tank 19 is connected with the pressure tank 18 through a booster pump 17, the input end of the booster pump 17 is connected with the filtered water storage tank 19, and the output end of the booster pump 17 is connected with the input end of the pressure tank 18; the output end of the pressure tank 18 is connected with the water supply input end of the medium water quality water using link and the low water quality water using link.
The overflow weir 151 has a through hole, on which a valve 155 is mounted. The height of the through hole is substantially the same as or slightly lower than the height of the second mid level sensor 153. Thus, if the water supply to the filter 13 is insufficient, the valve 155 may be directly opened to supply water. There may be a plurality of through holes and valves 155 and manual gate valves may be used.
In practice, the filter 13 is a sand filter designed as an automatic backwashing function filter device with differential pressure induction control or fixed period control, the backwashing water source is supplied with water by using the booster pump 17, the backwashing water path 131 is connected to a first end of the first three-way valve 132, and the other two ends of the first three-way valve 132 are respectively connected to the booster pump 17 and the pressure tank 18. The sewage outlet of the sand filter can be connected with the inlet of the first-stage sedimentation tank 11, and can also be directly connected to a sewage pipe network W. The backwashing procedure can adopt the flow shown in fig. 3, and fig. 3 is a schematic diagram of the backwashing procedure of the sand filter according to the embodiment of the invention.
The purified water filtered by the sand filter flows into the filtered water storage tank 19, and the filtered water storage tank 19 is provided with a high liquid level sensor, a middle liquid level sensor and a low liquid level sensor which are respectively a first high liquid level sensor 191, a first middle liquid level sensor 192 and a low liquid level sensor 193. The controller is respectively connected with the second high liquid level sensor 152 and the second three-way valve 111, and is used for controlling the second three-way valve 111 to switch the wastewater of the medium water quality water consumption link and the low water quality water consumption link between the sewage pipe network W and the inlet of the first sedimentation tank 11 when the liquid level reaches the second high liquid level sensor 152; the controller is respectively connected with the second middle liquid level sensor 153 and the pre-filtering pump 16 and is used for starting the pre-filtering pump 16 when the liquid level reaches the second middle liquid level sensor 153; the controller is connected to the second low level sensor 154 and the pre-filter pump 16, respectively, for stopping the pre-filter pump 16 when the liquid level is below the second low level sensor 154. That is, the first high level sensor 191 is used to control the pre-filter pump 16 to stop pumping water, so as to achieve the purpose of how much purified water is produced, thereby reducing the operation cost of the system to the maximum. The first mid level sensor 192 is used to control the activation of the booster pump 17, i.e. the booster pump 17 may only be activated when the water level in the filtered water reservoir 19 reaches a mid level. The first low level sensor 193 is used to stop the pressurizing pump 27 when the water level of the filtered water storage tank 19 reaches a low level, so that the pressurizing pump 17 can be protected from idle running without water. Under the condition that the water level of the filtered water storage tank 19 meets the starting condition of the booster pump 17, the starting and stopping of the booster pump 17 are completely controlled by the pressure induction in the pressure tank 18. Finally, the pressure tank 18 is communicated with a water supply pipe, and a water outlet C and a water outlet D respectively supply water at constant pressure for a medium water quality water using link and a low water quality water using link, so that the aim of efficiently utilizing water resources is fulfilled.
When the wastewater recycling system shown in fig. 2 is applied, an optional control flow is shown in fig. 4 and 5. Fig. 4 is a schematic diagram of a control flow of the wastewater recycling system in the water consumption state in the medium water quality water consumption link and the low water quality water consumption link according to the embodiment of the present invention. Fig. 5 is a schematic diagram of a control flow of the wastewater recycling system in the middle water quality water consumption link and the low water quality water consumption link in the water use stop state according to the embodiment of the present invention.
According to the utility model discloses technical scheme makes the overall process from single polycrystalline silicon piece and looks at, carries out the integrated analysis to each water spot among the process flow, and the ingenious partial water spot that utilizes is not high to the not high and all kinds of drainage point of water quality of waste water that arrange is with containing a large amount of solid suspended particles characteristics as the main, carries out waste water according to type recovery processing and unified distribution to realize high-efficient water. According to the difference of the quality of wastewater discharged from various water consumption points in the manufacturing process of the single-polycrystalline silicon wafer, two-stage series-connected horizontal flow sedimentation tanks are designed, so that solid particles in the wastewater are precipitated to the maximum extent. In order to reduce the operation cost of the system to the maximum extent, the operation of how much purified water is produced by using how much purified water is produced by the matching action of the sensors at all levels, the water pump and the automatic valve, and the operation cost of the wastewater recycling system is reduced. In order to realize constant-pressure water supply, a pressure tank 18 (containing a water pressure sensor) and a booster pump 17 are adopted to cooperate to realize the constant-pressure water supply, and meanwhile, the booster pump 17 is also used as a sand filter backwashing water source pump. The sand filter adopts a self-carrying differential pressure induction mode, a periodic automatic back flushing mode and a manual back flushing function, and can automatically control the matching action of the booster pump 17 and a branch valve to supply water for back flushing elution. Whether the waste water discharged from the medium water quality water consumption link and the low water quality water consumption link is discharged into the first-stage sedimentation tank 11 or is directly discharged into the sewage pipe network W can be controlled according to the water storage amount of the pre-filtering water storage tank 15, when the water stored in the pre-filtering water storage tank 15 reaches a high liquid level, the water path is automatically switched, so that the waste water discharged from the medium water quality water consumption link and the low water quality water consumption link is recovered, and the waste water discharged from the high water quality water consumption point is only used as a recovered water source. In order to solve the problem that the water source of the system cannot be quickly started for circulation after long-term shutdown and has local water shortage, a manual valve is arranged at the middle liquid level height of an overflow weir 151 between the second-stage sedimentation tank 12 and the pre-filtration water storage tank 15, and the water can be temporarily switched on to discharge water to the pre-filtration water storage tank 15 so as to start the circulation of the system. Adopt the technical scheme of the utility model, can synthesize the waste water of retrieving single polycrystal silicon chip manufacture in-process and be applied to this manufacture after handling, make medium quality of water link and low grade quality of water link wherein need not additionally to use the running water, reduced the running water consumption in the single polycrystal silicon chip manufacture. The embodiment of the utility model provides an in waste water cyclic utilization system's water treatment cost is also lower to but long-term automatic stabilization moves, to next generation buddha's warrior attendant wire-electrode cutting manufacturing process, this system still is very suitable for moreover, need not upgrade and reform transform.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A waste water recycling system is applied to manufacturing of single polycrystalline silicon wafers and is characterized by comprising:
a first-stage sedimentation tank (11);
a second-stage sedimentation tank (12);
a filter (13); wherein,
the first-stage sedimentation tank (11), the second-stage sedimentation tank (12) and the filter (13) are sequentially connected in series;
the first-stage sedimentation tank (11) is provided with a first-stage waste water receiving opening connected with a waste water outlet (A) of a medium water quality water using link and a waste water outlet (A) of a low water quality water using link and a first-stage sedimentation tank outlet for discharging the precipitated waste water;
the second-stage sedimentation tank (12) is provided with a second-stage sedimentation tank inlet connected with the first-stage sedimentation tank outlet and a second-stage waste water receiving opening connected with a waste water outlet (B) of a high water quality water consumption link;
the high-quality water consumption link, the medium-quality water consumption link and the low-quality water consumption link are divided according to the requirements of each water consumption link on water quality in the manufacturing process of the single polycrystalline silicon chip.
2. The system according to claim 1, characterized in that the first stage sedimentation tank (11) and the second stage sedimentation tank (12) are advection type sedimentation tanks.
3. A system according to claim 1, characterized in that the filter (13) is a sand filter.
4. A system according to claim 1, 2 or 3, further comprising a pre-filter pump (16), a post-filter water reservoir (19), a booster pump (17) and a pressure tank (18), wherein:
the second-stage sedimentation tank (12) is connected with the filter (13) through the pre-filtering pump (16), the input end of the pre-filtering pump (16) is connected with the second-stage sedimentation tank (12), and the output end of the pre-filtering pump (16) is connected with the filter (13);
the filtered water storage tank (19) is arranged between the filter (13) and the pressure tank (18) and is used for storing water filtered by the filter (13);
the filtered water storage tank (19) is connected with the pressure tank (18) through the booster pump (17), the input end of the booster pump (17) is connected with the filtered water storage tank (19), and the output end of the booster pump (17) is connected with the input end of the pressure tank (18);
the output end of the pressure tank (18) is connected with the water supply input end of the medium water quality water using link and the water supply input end of the low water quality water using link.
5. The system of claim 4, further comprising a controller, wherein three liquid level sensors, a first high liquid level sensor (191), a first medium liquid level sensor (192) and a first low liquid level sensor (193), are arranged in the filtered water storage tank (19) from high to low,
the controller is respectively connected with the first high liquid level sensor (191) and the pre-filtering pump (16) and is used for stopping the pre-filtering pump (16) when the liquid level reaches the first high liquid level sensor (191);
the controller is respectively connected with the first intermediate liquid level sensor (192) and the booster pump (17) and is used for starting the booster pump (17) when the liquid level reaches the first intermediate liquid level sensor (192);
the controller is respectively connected with the first low liquid level sensor (193) and the booster pump (17) and is used for stopping the booster pump (17) when the liquid level is lower than the first low liquid level sensor (193).
6. The system of claim 4, further comprising a first three-way valve (132);
the booster pump (17) and the pressure tank (18) are respectively connected to two ends of the first three-way valve (132), and a third end of the first three-way valve (132) is connected with a backwashing water channel (131) of the filter (13).
7. A system according to claim 6, wherein the backwash waste outlet of the filter (13) is connected to the inlet of the first stage settling tank (11).
8. The system of claim 4, further comprising a second three-way valve (111), a pre-filter reservoir (15), and a controller, wherein,
the first end of the second three-way valve (111) is connected with a wastewater outlet (A) of the medium water quality water consumption link and the low water quality water consumption link, the second end of the second three-way valve is connected with a sewage pipe network (W), and the third end of the second three-way valve is connected with an inlet of the first-stage sedimentation tank (11);
the pre-filtering water storage tank (15) is connected with the second-stage sedimentation tank (12) through an overflow weir (151), a second high liquid level sensor (152), a second medium liquid level sensor (153) and a second low liquid level sensor (154) are arranged in the pre-filtering water storage tank (15) from high to low, wherein,
the controller is respectively connected with the second high liquid level sensor (152) and the second three-way valve (111) and is used for controlling the second three-way valve (111) to switch the wastewater of the medium water quality water using link and the wastewater of the low water quality water using link between a sewage pipe network (W) and an inlet of the first-stage sedimentation tank (11) when the liquid level reaches the second high liquid level sensor (152);
the controller is respectively connected with the second middle liquid level sensor (153) and the pre-filtering pump (16) and is used for starting the pre-filtering pump (16) when the liquid level reaches the second middle liquid level sensor (153);
the controller is connected to the second low level sensor (154) and the pre-filter pump (16), respectively, for stopping the pre-filter pump (16) when the liquid level is below the second low level sensor (154).
9. The system of claim 8, wherein the weir (151) has a through hole with a valve (155) mounted thereon, the through hole having a height equal to or lower than a height of the second mid-level sensor (153) within the pre-filter reservoir (15).
10. The system of claim 9, wherein the through-hole and the valve (155) are one or more, and the valve (155) is a manual gate valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207500211U CN203007053U (en) | 2012-12-31 | 2012-12-31 | Wastewater recycling system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207500211U CN203007053U (en) | 2012-12-31 | 2012-12-31 | Wastewater recycling system |
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| CN203007053U true CN203007053U (en) | 2013-06-19 |
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| CN2012207500211U Expired - Fee Related CN203007053U (en) | 2012-12-31 | 2012-12-31 | Wastewater recycling system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103055600A (en) * | 2012-12-31 | 2013-04-24 | 英利集团有限公司 | Wastewater recycling method and system |
| CN106731207A (en) * | 2017-01-03 | 2017-05-31 | 石家庄旭新光电科技有限公司 | Waste water recycling system and its implementation in liquid crystal glass base production |
-
2012
- 2012-12-31 CN CN2012207500211U patent/CN203007053U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103055600A (en) * | 2012-12-31 | 2013-04-24 | 英利集团有限公司 | Wastewater recycling method and system |
| CN106731207A (en) * | 2017-01-03 | 2017-05-31 | 石家庄旭新光电科技有限公司 | Waste water recycling system and its implementation in liquid crystal glass base production |
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