CN112645502A - Zero release sewage filtration system - Google Patents
Zero release sewage filtration system Download PDFInfo
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- CN112645502A CN112645502A CN202110034519.1A CN202110034519A CN112645502A CN 112645502 A CN112645502 A CN 112645502A CN 202110034519 A CN202110034519 A CN 202110034519A CN 112645502 A CN112645502 A CN 112645502A
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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
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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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
- C02F1/44—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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
Abstract
The invention provides a zero-emission sewage filtering system, which comprises: the cleaning equipment, the first filtering equipment, the softening equipment, the second filtering equipment and the third filtering equipment are connected in sequence; the sewage filtered by the first filtering device flows into a softening device for water softening; the second filtering equipment comprises nanofiltration membrane equipment, and the purified water treated by the second filtering equipment flows into the source water tank through a purified water outlet; the concentrated water treated by the second filtering equipment flows into third filtering equipment through a concentrated water outlet for re-filtering treatment; the third filtering equipment comprises first reverse osmosis equipment, and the purified water treated by the third filtering equipment flows into the source water tank through the purified water outlet; the concentrated water treated by the third filtering device flows into the detergent water tank through a concentrated water outlet. The zero-discharge sewage filtering system provided by the invention well solves the problems that the sewage utilization rate is too low, the sewage cannot be recycled and the water resource is wasted in the prior art.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a zero-emission sewage filtering system.
Background
Beverage factory, grain processing factory need wash back reprocessing to the straw after collecting, wheat skin etc. but beverage factory or grain processing factory etc. among the prior art do not have supporting sewage filtration system or filtration system too crude, but the sewage after wasing straw, wheat skin directly discharges or the availability ratio of sewage is low excessively, can't accomplish cyclic utilization, has increased the waste to the water resource.
Disclosure of Invention
The invention provides a zero-emission sewage filtering system, and aims to solve the problems that the sewage utilization rate is too low, the sewage cannot be recycled and water resources are wasted in the prior art.
The invention provides a zero-emission sewage filtering system, which comprises: the device comprises a cleaning device, a first filtering device, a softening device, a second filtering device and a third filtering device; the cleaning equipment, the first filtering equipment, the softening equipment, the second filtering equipment and the third filtering equipment are sequentially connected; the cleaning equipment comprises a source water tank and a detergent water tank; the first filtering equipment comprises a basket filter, a self-cleaning filter, a quartz sand filter, an activated carbon filter, a first bag filter and a first precision filter which are sequentially connected; the sewage filtered by the first precision filter flows into a softening device for water softening; the second filtering equipment comprises nanofiltration membrane equipment, the nanofiltration membrane equipment is provided with a concentrated water outlet and a purified water outlet, and the purified water treated by the second filtering equipment flows into the source water tank through the purified water outlet; the concentrated water treated by the second filtering equipment flows into third filtering equipment through a concentrated water outlet for re-filtering treatment; the third filtering equipment comprises first reverse osmosis equipment, the first reverse osmosis equipment is provided with a concentrated water outlet and a purified water outlet, and the purified water treated by the third filtering equipment flows into the source water tank through the purified water outlet; the concentrated water treated by the third filtering device flows into the detergent water tank through a concentrated water outlet.
Furthermore, the cleaning equipment also comprises a multi-nozzle cleaning tank and a sewage tank; the source water tank and the detergent water tank are both connected with the multi-nozzle cleaning tank and used for providing cleaning water for cleaning the multi-nozzle cleaning tank; the multi-nozzle cleaning tank is connected with the sewage tank; and a horizontal pump is arranged at the outlet of the source water tank, and a water pump is arranged at the outlet of the sewage tank.
Furthermore, the water outlet precision of the basket filter is 2mm, the water outlet precision of the self-cleaning filter is 200 microns, the water outlet precision of the first bag filter is 10 microns, and the water outlet precision of the first precision filter is 1 micron.
The basket filter is mainly used for filtering straw, leaves, silt, detergent and other components in the sewage tank.
Further, the softening equipment comprises water softening equipment and a softened water salt tank; the first precision filter is connected with the water softening equipment, and the water softening equipment is connected with the softened water salt tank; the softened water salt tank is connected with the second filtering device.
Soften sewage through demineralized water equipment and demineralized water salt case, prevent that sewage from receiving the scale deposit on filter membrane and reverse osmosis membrane, and then influence the filtering quality who receives filter membrane equipment and reverse osmosis equipment.
Furthermore, the second filtering device also comprises an automatic filter, a first ultrafiltration membrane device, a first ultrafiltration water production tank, a second precision filter, a nanofiltration membrane device and a nanofiltration water production tank which are connected in sequence; a water pump is arranged at the outlet of the first ultrafiltration water production tank, a water pump is arranged at the outlet of the second precision filter, and a water pump is arranged at the outlet of the nanofiltration water production tank; the softened water salt tank is connected with the automatic filter material machine, and the nanofiltration water production tank is connected with the third filtering equipment.
The automatic material filtering machine comprises an anion ball, medical stones, an ultrafiltration core, manganese sand and the like, mineral substances can be added into the treated water, and the first ultrafiltration membrane equipment, the first ultrafiltration water production tank, the second precision filter, the nanofiltration membrane equipment and the nanofiltration water production tank play a role in filtering.
Furthermore, the precision of the purified water flowing out of the purified water outlet of the nanofiltration membrane equipment is 1-2nm, and the precision of the concentrated water flowing out of the concentrated water outlet of the nanofiltration membrane equipment is 0.01-0.001 mu m.
The nanofiltration membrane equipment classifies the filtered water into purified water and concentrated water, the purified water flows into the source water tank from the purified water outlet, and the concentrated water flows into the third filtering equipment from the concentrated water outlet for re-filtering.
Furthermore, the third filtering device also comprises a third precision filter and a first reverse osmosis device which are connected in sequence; the precision of the purified water flowing out of the purified water outlet of the first reverse osmosis equipment is 0.0001 mu m, and the precision of the concentrated water flowing out of the concentrated water outlet of the first reverse osmosis equipment is 0.01-0.001 mu m.
The third precision filter has the filtering effect; the first reverse osmosis apparatus classifies the filtered water into purified water, which flows into the source water tank from the purified water outlet, and concentrated water, which flows into the detergent water tank from the concentrated water outlet.
Further, the zero-emission sewage filtering system also comprises a fourth filtering device and a plurality of multi-way valves; the quartz sand filter, the activated carbon filter, the water softening equipment, the automatic filter material machine and the first ultrafiltration membrane equipment are all provided with a multi-way valve; and the plurality of multi-way valves are connected with the fourth filtering equipment after being sequentially connected.
The multi-way valve carries out back flush on the quartz sand filter, the activated carbon filter, the softened water equipment, the automatic filter and the first ultrafiltration membrane equipment, and impurities flow into the fourth filter equipment through the multi-way valve to be filtered.
Further, the fourth filtering device comprises a second bag filter, a fourth precision filter, a second ultrafiltration membrane device, a second ultrafiltration water production tank, a scale inhibitor medicine box, a fifth precision filter and a second reverse osmosis device which are connected in sequence; a water pump is arranged at the outlet of the fifth precision filter, and a scale inhibition pump is arranged at the outlet of the scale inhibitor medicine box; a multi-way valve is arranged on the second ultrafiltration membrane equipment and connected with the detergent water tank; the second reverse osmosis equipment is provided with a concentrated water outlet and a purified water outlet, and the purified water treated by the fourth filtering equipment flows into the source water tank through the purified water outlet; the concentrated water treated by the fourth filtering device flows into the detergent water tank through a concentrated water outlet.
The second bag filter, the fourth precision filter, the second ultrafiltration membrane device and the fifth precision filter have the filtering effect; the second reverse osmosis equipment classifies the filtered water into purified water and concentrated water, the purified water flows into the source water tank from the purified water outlet, and the concentrated water flows into the detergent water tank from the concentrated water outlet; the scale inhibitor medical kit is used for inhibiting the scale of the filtered water, and prevents the scale formation of sewage on a reverse osmosis membrane, thereby influencing the filtration performance of reverse osmosis equipment.
Furthermore, the water outlet precision of the second bag filter is 1 micron, the water outlet precision of the fourth precision filter is 0.1 micron, and the water outlet precision of the second ultrafiltration membrane equipment is 0.01-0.001 micron; the precision of the purified water flowing out of the purified water outlet of the second reverse osmosis equipment is 0.0001 mu m, and the precision of the concentrated water flowing out of the concentrated water outlet of the second reverse osmosis equipment is 0.01-0.001 mu m.
The reason why the water outlet precision of the fourth precise filter is set to be 0.1 mu m and the water outlet precision of the second ultrafiltration membrane device is set to be 0.01-0.001 mu m is that: and after the wastewater with the particle size of 0.1 μm treated by the fourth ultrafilter is filtered by the second ultrafiltration membrane equipment, the filtered impurities stay on the filtering membrane of the second ultrafiltration membrane equipment, and flow into the detergent water tank after being subjected to back washing by the multi-way valve, and the back-washed wastewater with the particle size of 0.1 μm can be put into the detergent water tank for use.
According to the zero-discharge sewage filtering system provided by the invention, sewage is sequentially filtered for multiple times through the first filtering device, the second filtering device and the third filtering device, the tail end of the second filtering device is provided with the purified water outlet and the concentrated water outlet, the purified water flowing out of the purified water outlet returns to the source water tank, and the concentrated water flowing out of the concentrated water outlet returns to the third filtering device for re-filtering; and the tail end of the third filtering device is provided with a purified water outlet and a concentrated water outlet, the purified water flowing out of the purified water outlet returns to the source water tank, and the concentrated water flowing out of the concentrated water outlet returns to the detergent water tank. Through filtering and recycling many times like this, except evaporating the zero release that can accomplish sewage, and pure water and detergent can cyclic utilization, have reduced the waste to the water resource.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a process diagram of a zero-discharge sewage filtration system provided by the present invention.
Description of reference numerals:
1, a cleaning device, 11, 12, 13, 14, 15 and 16 are water tanks, a source water tank, a detergent water tank, a multi-nozzle cleaning tank, a sewage tank, a horizontal pump and a water pump respectively;
2 is a first filtering device, 21 is a basket filter, 22 is a self-cleaning filter, 23 is a quartz sand filter, 24 is an activated carbon filter, 25 is a first bag filter, and 26 is a first precision filter;
3, softening equipment, 31, and 32, namely a softened water salt tank;
4, second filtering equipment, 41, an automatic filter, 42, first ultrafiltration membrane equipment, 43, a first ultrafiltration water production tank, 44, a second precision filter, 45, a nanofiltration membrane equipment, 46, a nanofiltration water production tank, 47, a purified water outlet and 48, wherein the first ultrafiltration water production tank is connected with the second precision filter;
5 is a third filtering device, 51 is a third precision filter, and 52 is a first reverse osmosis device;
6 is a fourth filtering device, 61 is a second bag filter, 62 is a fourth precision filter, 63 is a second ultrafiltration membrane device, 64 is a second ultrafiltration water production tank, 65 is a fifth precision filter, 66 is a second reverse osmosis device, 67 is a scale inhibitor medicine box, and 68 is a scale inhibition pump;
7 is a multi-way valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present invention provides a zero-discharge sewage filtering system, including: the cleaning device 1, the first filtering device 2, the softening device 3, the second filtering device 4 and the third filtering device 5; the cleaning equipment 1, the first filtering equipment 2, the softening equipment 3, the second filtering equipment 4 and the third filtering equipment 5 are connected in sequence; the cleaning device 1 comprises a source water tank 11 and a detergent water tank 12; the first filtering device 2 comprises a basket filter 21, a self-cleaning filter 22, a quartz sand filter 23, an activated carbon filter 24, a first bag filter 25 and a first precision filter 26 which are connected in sequence; the sewage filtered by the first precision filter 26 flows into the softening device 3 for water softening; the second filtering device 4 comprises a nanofiltration membrane device 44, the nanofiltration membrane device 44 is provided with a concentrated water outlet 47 and a purified water outlet 46, and the purified water treated by the second filtering device 4 flows into the source water tank through the purified water outlet 46; the concentrated water treated by the second filtering device 4 flows into the third filtering device 5 through the concentrated water outlet 47 for re-filtering treatment; the third filtering device 5 comprises a first reverse osmosis device 52, the first reverse osmosis device 52 is provided with a concentrated water outlet 47 and a purified water outlet 46, and the purified water treated by the third filtering device 5 flows into the source water tank 11 through the purified water outlet 46; the concentrated water treated by the third filtering apparatus 5 flows into the detergent water tank 12 through the concentrated water outlet 47.
Specifically, the cleaning device 1 comprises a source water tank 11, a detergent water tank 12, a multi-nozzle cleaning tank 13 and a sewage tank 14, and the cleaning device 1 is used for cleaning the collected straws and wheat bran.
Further, the source water tank 11 and the detergent water tank 12 are both connected to the multi-nozzle washing tank 13 for providing washing water for washing the multi-nozzle washing tank 13; the multi-nozzle cleaning tank 13 is connected with the sewage tank 14; a horizontal pump 15 is arranged at the outlet of the source water tank 11, and a water pump 16 is arranged at the outlet of the sewage tank 14.
Further, the multi-nozzle washing tank 13 includes ten nozzles, seven of which are connected to the source water tank 11 and three of which are connected to the detergent tank 12.
Specifically, the first filtering apparatus 2 comprises a basket filter 21, a self-cleaning filter 22, a quartz sand filter 23, an activated carbon filter 24, a first bag filter 25 and a first precision filter 26 which are connected in sequence, and the first filtering apparatus 2 is used for filtering sewage.
Furthermore, the water outlet precision of the basket filter 21 is 2mm, the water outlet precision of the self-cleaning filter 22 is 200 μm, the water outlet precision of the first bag filter 25 is 10 μm, and the water outlet precision of the first precision filter 26 is 1 μm.
The basket filter 21 mainly filters straw, leaves, silt, detergent and other components in the sewage tank.
Specifically, the softening device 3 includes a softened water device 31 and a softened water salt tank 32; the first precision filter 26 is connected with the softened water device 31, and the softened water device 31 is connected with the softened water salt tank 32; the demineralized water salt tank 32 is connected to the second filter device 4.
Soften sewage through demineralized water equipment 31 and demineralized water salt case 32, prevent that sewage from the scale deposit on nanofiltration membrane and reverse osmosis membrane, and then influence the filtering quality of nanofiltration membrane equipment and reverse osmosis equipment.
Specifically, the second filtering device 4 comprises an automatic filtering machine 41, a first ultrafiltration membrane device 42, a first ultrafiltration water production tank 43, a second precision filter 44, a nanofiltration membrane device 45 and a nanofiltration water production tank 46 which are connected in sequence, and the second filtering device 4 is used for filtering and recycling sewage.
Further, a water pump 16 is arranged at an outlet of the first ultrafiltration water production tank 43, a water pump is arranged at an outlet of the second precision filter 44, and a water pump 16 is arranged at an outlet of the nanofiltration water production tank 46; the softened water salt tank 32 is connected with the automatic filtering machine 41, and the nano-filtering water production tank 46 is connected with the third filtering device 5.
The automatic material filtering machine 41 comprises anion balls, medical stones, ultrafiltration cores, manganese sand and the like, mineral substances can be added into the treated water, and the first ultrafiltration membrane equipment 42, the first ultrafiltration water production tank 43, the second precision filter, the nanofiltration membrane equipment and the nanofiltration water production tank play a role in filtering.
Furthermore, the precision of the purified water flowing out of the purified water outlet 47 of the nanofiltration membrane device 45 is 1-2nm, and the precision of the concentrated water flowing out of the concentrated water outlet 48 of the nanofiltration membrane device 45 is 0.01-0.001 μm.
The nanofiltration membrane device 45 classifies the filtered water into purified water, which flows into the source water tank 11 from the purified water outlet 47, and concentrated water, which flows into the third filtering device 5 from the concentrated water outlet 48, for re-filtering.
Specifically, the third filtering device 5 comprises a third precision filter 51 and a first reverse osmosis device 52 which are connected in sequence; the precision of the purified water flowing out of the purified water outlet 47 of the first reverse osmosis device 52 is 0.0001 μm, and the precision of the concentrated water flowing out of the concentrated water outlet 48 of the first reverse osmosis device 52 is 0.01-0.001 μm.
The third fine filter 51 has a filtering effect; the first reverse osmosis apparatus 52 classifies the filtered water into purified water, which flows into the source water tank 11 from the purified water outlet 47, and concentrated water, which flows into the detergent water tank 12 from the concentrated water outlet 48. The water is recycled by the first reverse osmosis device 52.
Specifically, the zero-emission sewage filtering system further comprises a fourth filtering device 6 and a plurality of multi-way valves 7; the quartz sand filter 23, the activated carbon filter 24, the softened water device 31, the automatic filter 41 and the first ultrafiltration membrane device 42 are all provided with a multi-way valve 7; and the multiple-way valves 7 are connected with the fourth filtering equipment 6 after being sequentially connected.
The multi-way valve 7 performs back flushing on the quartz sand filter 23, the activated carbon filter 24, the softened water device 31, the automatic filter 41 and the first ultrafiltration membrane device 42, and impurities flow into the fourth filtering device 6 through the multi-way valve 7 to be filtered.
Specifically, the fourth filtering device 6 comprises a second bag filter 61, a fourth precision filter 62, a second ultrafiltration membrane device 63, a second ultrafiltration water production tank 64, a scale inhibitor medicine box 67, a fifth precision filter 65 and a second reverse osmosis device 66 which are connected in sequence. The fourth filtering device 6 mainly filters and recycles the water.
Further, a water pump 16 is arranged at the outlet of the fifth precision filter 65, and a scale inhibition pump 68 is arranged at the outlet of the scale inhibitor medicine box 67; the second reverse osmosis device 66 is provided with a concentrated water outlet 48 and a purified water outlet 47, and the purified water treated by the fourth filtering device 6 flows into the source water tank 11 through the purified water outlet 47; the concentrated water treated by the fourth filtering device 6 flows into the detergent water tank 12 through the concentrated water outlet 48.
The second bag filter 61, the fourth precision filter 62, the second ultrafiltration membrane device 63 and the fifth precision filter 65 play a role in filtration; the second reverse osmosis apparatus 66 classifies the filtered water into purified water, which flows into the source water tank 11 from the purified water outlet 47, and concentrated water, which flows into the detergent water tank 12 from the concentrated water outlet 48; the scale inhibitor medical kit 67 is used for inhibiting the scale of the filtered water, and prevents sewage from scaling on the reverse osmosis membrane, so that the filtering performance of reverse osmosis equipment is influenced.
Furthermore, a multi-way valve is arranged on the second ultrafiltration membrane device and connected with the detergent water tank.
Furthermore, the water outlet precision of the second bag filter 61 is 1 μm, the water outlet precision of the fourth precision filter 62 is 0.1 μm, and the water outlet precision of the second ultrafiltration membrane device 63 is 0.01-0.001 μm; the precision of the purified water flowing out of the purified water outlet 47 of the second reverse osmosis device 66 is 0.0001 μm, and the precision of the concentrated water flowing out of the concentrated water outlet 48 of the second reverse osmosis device 66 is 0.01-0.001 μm.
The reason why the water outlet precision of the fourth precision filter 62 is set to 0.1 μm and the water outlet precision of the second ultrafiltration membrane device 63 is set to 0.01-0.001 μm is that: after the wastewater with the particle size of 0.1 μm treated by the fourth ultrafilter 62 is filtered by the second ultrafiltration membrane device 63, the impurities with the particle size of 0.1 μm cannot pass through the filtration membrane of the second ultrafiltration membrane device 63, the filtered impurities stay on the filtration membrane of the second ultrafiltration membrane device 63, and flow into the detergent water tank 12 after being subjected to back washing by the multi-way valve 7, and the precision of the wastewater after the back washing is 0.1 μm, so that the wastewater can be put into the detergent water tank 12 for use.
Remarking: the volume of the concentrated water flowing into the detergent water tank 12 after being backflushed through the multi-way valve 7 is small, and is only about 50L.
The invention provides a zero-discharge sewage filtering system, which comprises the following water treatment steps:
(1) the collected straws and wheat bran are cleaned in a multi-nozzle cleaning tank 13 through a source water tank 11 and a detergent water tank 12, and the cleaned sewage enters a sewage tank 14;
(2) the sewage is washed layer by layer in the first filtering device 2 sequentially through a basket filter 21, a self-cleaning filter 22, a quartz sand filter 23, an activated carbon filter 24, a first bag filter 25 and a first precision filter 26, and finally the sewage with the water outlet precision of 1 mu m is obtained;
(3) after the sewage is filtered in the first filtering device 2, in the softening device 3, the sewage is softened by the softened water device 31 and the softened water salt tank 32 to remove dirt in the water;
(4) after the wastewater is softened in the softening device 3, the wastewater is filtered by the automatic filter 41, the first ultrafiltration membrane device 42, the first ultrafiltration product water tank 43, the second precision filter 44 and the nanofiltration membrane device 45 in the second filtration device 4 in sequence, then the purified water flows back to the source water tank 11 from the purified water outlet 47 of the nanofiltration membrane device 45, and the concentrated water flows to the nanofiltration product water tank 46 from the concentrated water outlet 48 of the nanofiltration membrane device 45 and then is filtered in the third filtration device 5.
(5) After the contaminated water is filtered in the second filtering apparatus 4, the contaminated water is filtered by a third fine filter 51 in a third filtering apparatus 5, purified water flows back to the source water tank 11 from a purified water outlet 47 of the first reverse osmosis apparatus 52, and concentrated water flows back to the detergent water tank 12 from a concentrated water outlet 48 of the first reverse osmosis apparatus 52.
So far, the sewage completes the filtering and self-circulation processes in the equipment. In addition, the method also comprises the step of
(6) The multi-way valve 7 performs back flushing on the quartz sand filter 23, the activated carbon filter 24, the softened water device 31, the automatic filter 41 and the first ultrafiltration membrane device 42, impurities flow into the fourth filtration device 6 through the multi-way valve 7 to be filtered, in the fourth filtration device 6, sewage sequentially passes through the second bag filter 61, the fourth precision filter 62, the second ultrafiltration membrane device 63, the second ultrafiltration product water tank 64, the scale inhibitor medicine tank 67, the fifth precision filter 65 and the second reverse osmosis device 66 to be filtered, in the second ultrafiltration membrane device 63, the sewage after being flushed through the multi-way valve 7 flows into the detergent water tank 12, purified water flows back to the source water tank 11 from the purified water outlet 47 of the second reverse osmosis device 66, and concentrated water flows back to the detergent water tank 12 from the concentrated water outlet 48 of the second reverse osmosis device 66.
Therefore, according to the zero-discharge sewage filtering system provided by the invention, sewage is sequentially filtered for multiple times through the first filtering device, the second filtering device and the third filtering device, the tail end of the second filtering device is provided with the purified water outlet and the concentrated water outlet, the purified water flowing out of the purified water outlet returns to the source water tank, and the concentrated water flowing out of the concentrated water outlet returns to the third filtering device for re-filtering; and the tail end of the third filtering device is provided with a purified water outlet and a concentrated water outlet, the purified water flowing out of the purified water outlet returns to the source water tank, and the concentrated water flowing out of the concentrated water outlet returns to the detergent water tank. Through filtering and recycling many times like this, except evaporating the zero release that can accomplish sewage, and pure water and detergent can cyclic utilization, have reduced the waste to the water resource.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A zero-emission sewage filtration system, comprising: the device comprises a cleaning device, a first filtering device, a softening device, a second filtering device and a third filtering device;
the cleaning equipment, the first filtering equipment, the softening equipment, the second filtering equipment and the third filtering equipment are sequentially connected;
the cleaning equipment comprises a source water tank and a detergent water tank;
the first filtering equipment comprises a basket filter, a self-cleaning filter, a quartz sand filter, an activated carbon filter, a first bag filter and a first precision filter which are sequentially connected;
the sewage filtered by the first precision filter flows into a softening device for water softening;
the second filtering equipment comprises nanofiltration membrane equipment, the nanofiltration membrane equipment is provided with a concentrated water outlet and a purified water outlet, and the purified water treated by the second filtering equipment flows into the source water tank through the purified water outlet; the concentrated water treated by the second filtering equipment flows into third filtering equipment through a concentrated water outlet for re-filtering treatment;
the third filtering equipment comprises first reverse osmosis equipment, the first reverse osmosis equipment is provided with a concentrated water outlet and a purified water outlet, and the purified water treated by the third filtering equipment flows into the source water tank through the purified water outlet; the concentrated water treated by the third filtering device flows into the detergent water tank through a concentrated water outlet.
2. The zero-discharge wastewater filtration system of claim 1, wherein the cleaning apparatus further comprises a multi-jet cleaning tank and a wastewater tank;
the source water tank and the detergent water tank are both connected with the multi-nozzle cleaning tank and used for providing cleaning water for cleaning the multi-nozzle cleaning tank;
the multi-nozzle cleaning tank is connected with the sewage tank;
and a horizontal pump is arranged at the outlet of the source water tank, and a water pump is arranged at the outlet of the sewage tank.
3. The zero-discharge sewage filtering system according to claim 2, wherein the basket filter has a water outlet accuracy of 2mm, the self-cleaning filter has a water outlet accuracy of 200 μm, the first bag filter has a water outlet accuracy of 10 μm, and the first precision filter has a water outlet accuracy of 1 μm.
4. The zero-emission wastewater filtration system of claim 3, wherein the softening device comprises a softened water device and a softened salt tank;
the first precision filter is connected with the water softening equipment, and the water softening equipment is connected with the softened water salt tank;
the softened water salt tank is connected with the second filtering device.
5. The zero-emission sewage filtration system of claim 4, wherein the second filtration equipment further comprises an automatic filter, a first ultrafiltration membrane equipment, a first ultrafiltration water production tank, a second precision filter, a nanofiltration membrane equipment and a nanofiltration water production tank which are connected in sequence;
a water pump is arranged at the outlet of the first ultrafiltration water production tank, a water pump is arranged at the outlet of the second precision filter, and a water pump is arranged at the outlet of the nanofiltration water production tank;
the softened water salt tank is connected with the automatic filter material machine, and the nanofiltration water production tank is connected with the third filtering equipment.
6. The zero-emission sewage filtering system of claim 5, wherein the precision of the purified water flowing out of the purified water outlet of the nanofiltration membrane device is 1-2nm, and the precision of the concentrated water flowing out of the concentrated water outlet of the nanofiltration membrane device is 0.01-0.001 μm.
7. The zero-discharge sewage filtration system of claim 5 wherein the third filtration apparatus further comprises a third fine filter and a first reverse osmosis apparatus connected in series;
the precision of the purified water flowing out of the purified water outlet of the first reverse osmosis equipment is 0.0001 mu m, and the precision of the concentrated water flowing out of the concentrated water outlet of the first reverse osmosis equipment is 0.01-0.001 mu m.
8. The zero-discharge sewage filtration system according to claim 6, further comprising a fourth filtration device and a plurality of multi-way valves;
the quartz sand filter, the activated carbon filter, the water softening equipment, the automatic filter material machine and the first ultrafiltration membrane equipment are all provided with a multi-way valve;
and the plurality of multi-way valves are connected with the fourth filtering equipment after being sequentially connected.
9. The zero-emission sewage filtration system of claim 8, wherein the fourth filtration equipment comprises a second bag filter, a fourth precision filter, a second ultrafiltration membrane equipment, a second ultrafiltration water production tank, a scale inhibitor medicine box, a fifth precision filter and second reverse osmosis equipment which are connected in sequence;
a water pump is arranged at the outlet of the fifth precision filter, and a scale inhibition pump is arranged at the outlet of the scale inhibitor medicine box;
and the second ultrafiltration membrane equipment is provided with a multi-way valve, and the multi-way valve is connected with the detergent water tank.
The second reverse osmosis equipment is provided with a concentrated water outlet and a purified water outlet, and the purified water treated by the fourth filtering equipment flows into the source water tank through the purified water outlet; the concentrated water treated by the fourth filtering device flows into the detergent water tank through a concentrated water outlet.
10. The zero-emission sewage filtering system of claim 9 wherein the second bag filter has a water outlet accuracy of 1 μm, the fourth precision filter has a water outlet accuracy of 0.1 μm, and the second ultrafiltration membrane device has a water outlet accuracy of 0.01-0.001 μm;
the precision of the purified water flowing out of the purified water outlet of the second reverse osmosis equipment is 0.0001 mu m, and the precision of the concentrated water flowing out of the concentrated water outlet of the second reverse osmosis equipment is 0.01-0.001 mu m.
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