CN115521028A - Combined advanced treatment system and method for industrial wastewater - Google Patents
Combined advanced treatment system and method for industrial wastewater Download PDFInfo
- Publication number
- CN115521028A CN115521028A CN202211227629.0A CN202211227629A CN115521028A CN 115521028 A CN115521028 A CN 115521028A CN 202211227629 A CN202211227629 A CN 202211227629A CN 115521028 A CN115521028 A CN 115521028A
- Authority
- CN
- China
- Prior art keywords
- water
- chamber
- backwashing
- tank
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010842 industrial wastewater Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 276
- 238000011001 backwashing Methods 0.000 claims abstract description 137
- 238000009826 distribution Methods 0.000 claims abstract description 93
- 238000005188 flotation Methods 0.000 claims abstract description 50
- 238000005189 flocculation Methods 0.000 claims abstract description 39
- 230000016615 flocculation Effects 0.000 claims abstract description 39
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000005345 coagulation Methods 0.000 claims abstract description 33
- 230000015271 coagulation Effects 0.000 claims abstract description 33
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 28
- 238000000926 separation method Methods 0.000 claims abstract description 23
- 239000000701 coagulant Substances 0.000 claims abstract description 16
- 239000008394 flocculating agent Substances 0.000 claims abstract description 7
- 238000010992 reflux Methods 0.000 claims abstract description 3
- 238000005406 washing Methods 0.000 claims description 28
- 239000002351 wastewater Substances 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 12
- 230000005484 gravity Effects 0.000 claims description 12
- 230000001112 coagulating effect Effects 0.000 claims description 9
- 239000003814 drug Substances 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 9
- 229940037003 alum Drugs 0.000 claims description 6
- 239000002957 persistent organic pollutant Substances 0.000 claims description 5
- 239000010865 sewage Substances 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 239000008213 purified water Substances 0.000 claims description 3
- 238000004659 sterilization and disinfection Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 230000003311 flocculating effect Effects 0.000 claims 5
- 238000004090 dissolution Methods 0.000 claims 1
- 238000004065 wastewater treatment Methods 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a combined advanced treatment system for industrial wastewater, which comprises a denitrification filter tank, an air flotation tank and a dosing room; the denitrification filter tank is an upward flow filter tank adopting light filter materials and comprises a water distribution system, a filter system and a backwashing system; the air floatation tank is designed for refluxing, pressurizing and dissolving air and comprises a water distribution chamber, a coagulation chamber, a flocculation chamber, a contact chamber, a separation chamber and an air floatation tank water outlet channel; the dosing device of the dosing room comprises a carbon source dosing device, a coagulant dosing device and a flocculating agent dosing device. The invention also discloses a combined advanced treatment method for the industrial wastewater. The invention aims at organically combining the denitrification filter tank and the air flotation tank, deeply removing the front-end effluent TN by the denitrification filter tank, and deeply removing the SS, TP and COD of the effluent of the denitrification filter tank by the air flotation tank, thereby ensuring that the final effluent of the industrial wastewater treatment plant stably reaches the standard.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a combined advanced treatment system and method for industrial wastewater.
Background
As the last pass of discharge after the industrial wastewater treatment, the industrial wastewater treatment plant must ensure that the effluent reaches the standard stably, however, the industrial wastewater is different from municipal wastewater, has wide source, complex components and poor biodegradability, and puts high requirements on the production and operation of the industrial wastewater treatment plant. In recent years, with the stricter market environmental protection supervision, sewage disposal enterprises continuously strengthen the internal pretreatment of industrial wastewater, so that the quality of inlet water of industrial wastewater treatment plants is obviously changed, new problems of low inlet water B/C, unbalanced inlet water C/N/P, high outlet water TN and the like are brought, and the current production and operation modes of plants are challenged. In combination with the above problems, it is necessary to add a deep treatment system at the end of the process flow as a security measure, in addition to giving full play to the role of the secondary biochemical treatment process in the plant area.
The denitrification filter is widely applied to TN (total suspended solids) deep removal of municipal sewage and industrial wastewater, and the mainstream process of the denitrification filter comprises a deep-bed filter and an upward-flow biological filter, wherein the upward-flow biological filter can be divided into two types of heavy filter materials and light filter materials. The light filter material upward flow biological denitrification filter is favored by the market due to the advantages of high speed of film formation of the light filter material, operation energy consumption and equipment investment saving by gravity flow backwashing, high treatment load of the filter, good TN removal effect, land occupation saving, difficult blockage, easy maintenance and the like. Aiming at the industrial wastewater treatment plant with the characteristics, the light filter material biological denitrification filter is a good TN advanced treatment process choice, however, the light filter material biological denitrification filter has higher requirements on operation specialties, and is careless, indexes such as COD (chemical oxygen demand), SS (suspended solids) and the like of effluent can obviously fluctuate, and even exceed the standard. In addition, the light filter material denitrification filter has no TP removal effect basically.
Disclosure of Invention
Aiming at the technical problems, the invention provides a combined advanced treatment system and a combined advanced treatment method for industrial wastewater, which adopt the following technical scheme:
a combined advanced treatment system for industrial wastewater comprises a denitrification filter tank, an air flotation tank and a dosing room.
The denitrification filter tank is an upward flow filter tank adopting light filter materials and comprises a water distribution system, a filter system and a backwashing system.
The water distribution system comprises a water inlet channel, a water distribution well, a water distribution pipe and a water distribution channel. The water inlet channel is arranged at the top of the denitrification filter and is separated from the water distribution well through a gate valve. The bottom of the water distribution pipe is connected with water distribution pipes which lead to water distribution channels at the bottom of each filter pool, and the water distribution pipes are provided with water inlet flow meters and valves.
The filtering system comprises a clean water area, a water outlet channel, an upper filtering plate, a filtering material layer and a lower cover plate. The clear water zone is communicated with the water outlet channel of the denitrification filter and is separated from the filter material layer through the upper filter plate, and the filter material layer is separated from the water distribution channel at the bottom of the filter through the lower cover plate. The denitrification filter pool outlet channel is provided with a water outlet hole which is communicated with the air floatation tank.
The backwashing system comprises a backwashing fan, a backwashing air inlet pipe, a backwashing drainage channel, a backwashing drainage pipe, a backwashing drainage main channel, a backwashing drainage main pipe and a backwashing wastewater pool. The backwashing system adopts a gravity flow backwashing mode, and backwashing water comes from a clear water area of the filtering system. And the backwashing fan supplies backwashing air to the denitrification filter through the backwashing air inlet pipe. One side of the backwashing drainage channel is communicated with the water distribution channel at the bottom of the filter tank, and the other side of the backwashing drainage channel is communicated with the backwashing drainage main channel through the backwashing drainage pipe. The backwashing drainage main channel is communicated with the backwashing wastewater pool through the backwashing drainage main pipe.
The air floatation tank is designed for refluxing, pressurizing and dissolving air and comprises a water distribution chamber, a coagulation chamber, a flocculation chamber, a contact chamber, a separation chamber and an air floatation tank water outlet channel.
One side of a water distribution chamber of the air flotation tank is communicated with a denitrification filter outlet channel, the bottom of the other side of the air flotation tank is provided with a water distribution chamber water through hole communicated with a coagulation chamber, and a water distribution chamber water distribution weir is arranged in the water distribution chamber. The room that thoughtlessly congeals one side intercommunication water distribution chamber, the another side top sets up the room that thoughtlessly congeals and crosses the water hole, intercommunication flocculation chamber, and flocculation chamber one side intercommunication is congealed the room, and the another side bottom sets up the flocculation chamber and crosses the water hole, and intercommunication contact chamber, contact chamber one side intercommunication flocculation chamber, the another side is the contact chamber folded plate, separates with the separation chamber. The contact chamber is internally provided with a dissolved air releaser which is communicated with a pressurizing dissolved air device. One side of the separation chamber is communicated with the contact chamber, and the other side is provided with a water outlet weir which is communicated with a water outlet channel. The water outlet channel of the air floatation tank is provided with a return pipe and an air floatation water outlet hole which are respectively communicated with the pressurizing and air dissolving device and the subsequent treatment unit.
The medicine adding device of the medicine adding room comprises: a carbon source dosing device, a coagulant dosing device and a flocculating agent dosing device.
The carbon source dosing device is communicated with the denitrification filter water inlet channel through a carbon source dosing pipe. The coagulant adding device is communicated with the coagulation chamber of the air flotation tank through a coagulant adding pipe, and the flocculating agent adding device is communicated with the flocculation chamber of the air flotation tank through a flocculating agent adding pipe.
Furthermore, the backwashing water discharge pipe is provided with a valve, the backwashing water discharge main pipe is also provided with a backwashing water discharge flow meter besides the valve, and the backwashing wastewater pool is provided with a backwashing wastewater pump.
Further, a mixing paddle of the coagulation chamber is arranged in the coagulation chamber; the flocculation chamber stirring paddle is arranged in the flocculation chamber.
Furthermore, a dissolved air releaser is arranged in the contact chamber and is communicated with the pressurizing and dissolved air device.
Furthermore, a scum groove is arranged in the separation chamber, a slag scraper is arranged at the top of the separation chamber, and an adjustable weir plate is arranged on the water outlet weir. The scum groove is communicated with the scum tank through a scum pipe.
Furthermore, the dosing devices comprise a medicine storage tank, a dosing pump and an electric control cabinet.
Furthermore, the dosing device also comprises an active carbon dosing device which is communicated with one or more of the water distribution chamber of the air flotation tank, the coagulation chamber, the flocculation chamber and the contact chamber through a carbon slurry dosing pipe.
The combined advanced treatment method for industrial wastewater comprises the step of performing advanced treatment on water to be treated sequentially through the denitrification filter tank and the air flotation tank.
Water to be treated enters a water distribution well through a water inlet channel at the top of the denitrification filter, then enters a water distribution channel at the bottom of each filter through a water distribution pipe at the bottom of the water distribution well, sequentially passes through a lower cover plate, a filter material layer, an upper filter plate and a clear water area from bottom to top, and finally enters an air flotation tank through a water outlet hole of a water outlet channel of the denitrification filter;
backwashing the denitrification filter, wherein backwashing wastewater enters a backwashing drainage channel through a water distribution channel at the bottom of the filter tank, then enters a backwashing drainage main channel through a backwashing drainage pipe, and finally enters a backwashing wastewater pool through a backwashing drainage main pipe;
the water entering the air flotation tank enters the coagulation chamber through the water distribution weir and the water through hole of the water distribution chamber, is fully mixed with the coagulant from the dosing device of the coagulant in the dosing room under the rapid stirring of the stirring paddle of the coagulation chamber, then enters the flocculation chamber through the water through hole of the coagulation chamber, and is fully flocculated with the flocculant from the dosing device of the flocculant in the dosing room under the slow stirring of the stirring paddle of the flocculation chamber to form homogeneous alum floc;
sewage carrying alum floc enters the contact chamber through the water holes of the flocculation chamber, adheres to a large amount of micro bubbles which are released by the dissolved air releaser and are highly dispersed in water to form foam floc with integral density smaller than that of water, floats to the water surface, is scraped into a scum groove by a scum scraper at the top of the separation chamber in a scum form, and finally enters a scum tank through a scum pipe; the rest purified water enters the water outlet channel of the air flotation tank through the water outlet weir of the separation chamber, a part of backflow water enters the pressurized air dissolving device through the return pipe of the water outlet channel of the air flotation tank for preparing high-pressure air dissolving water, and the rest part of backflow water enters the subsequent treatment units such as the disinfection tank through the water outlet hole of the air flotation tank.
Further, backwashing the denitrification filter tank comprises the following steps:
step 1: and closing a water inlet valve of the denitrification filter, isolating the denitrification filter and starting backwashing.
Step 2: and (4) pre-washing with water. Opening a backwashing drain valve at the bottom of the denitrification filter tank, and performing gravity running water prewashing by using the filter tank effluent water in the clear water area, wherein the prewashing strength of the water is 50-70 Nm 3 /m 2 h, closing the backwashing drainage valve after 30 to 90 seconds.
And step 3: and (5) exhausting. And opening an exhaust valve, a backwashing air inlet valve and a backwashing fan at the bottom of the filter tank, quickly emptying residual gas and water in the air grids, and closing the exhaust valve after 30-90 s.
And 4, step 4: and (5) air washing. Backwash air enters the denitrification filter tank through a backwash air inlet pipe, and the air washing strength is 12-14 Nm 3 /m 2 And h, closing the backwashing fan and the backwashing air inlet valve after 2-3 min.
And 5: the exhaust is stable. And opening an exhaust valve, keeping a standing state in the denitrification filter tank to enable the filter material layer to recover to be stable so as to prevent material leakage during water washing, simultaneously emptying gas in the air grids, and closing the exhaust valve after 30-90 s.
Step 6: and (5) washing with water. Opening a backwashing drainage valve, and performing gravity flow washing by using the outlet water of the filter tank in the clear water area, wherein the washing strength is 50-70 Nm 3 /m 2 h, closing the backwashing drainage valve after 1-2 min.
And 7: and (5) alternately flushing with air and water. The method is the same as air washing and water washing, and the steps of 4-6 are circulated for 2-3 times.
And 8: and (6) rinsing. Opening a backwashing drainage valve, and performing gravity flow washing by using the outlet water of the filter tank in the clear water area, wherein the washing strength is 50-70 Nm 3 /m 2 And h, closing the backwashing drainage valve after 3-5 min.
And step 9: and (5) after backwashing is finished, opening a water inlet valve of the denitrification filter, and recovering the normal operation of the filter.
Furthermore, the dosing room also comprises an active carbon dosing device. The activated carbon dosing device is communicated with one or more of the water distribution chamber, the coagulation chamber, the flocculation chamber and the contact chamber of the air flotation tank through a carbon slurry dosing pipe, and continuously provides carbon slurry for the air flotation tank to remove refractory organic pollutants and chromophores.
The invention aims at organically combining the denitrification filter tank and the air flotation tank, deeply removing the front-end effluent TN by the denitrification filter tank, and deeply removing the SS, TP and COD of the effluent of the denitrification filter tank by the air flotation tank, thereby ensuring that the final effluent of the industrial wastewater treatment plant stably reaches the standard. The industrial wastewater combined advanced treatment system can fully exert the advantages of the denitrification filter tank and the air floatation tank, is very suitable for being used as a supplementary process of secondary biochemical treatment of an industrial wastewater treatment plant, efficiently removes TN, TP, COD, SS, refractory organic pollutants, chromaticity and the like remained in effluent of a biochemical section, ensures the stability of production and operation, improves the quality of effluent of a factory area, and has a prominent application prospect. The invention can also load activated carbon to specifically remove persistent organic pollutants, chromophores and the like in the industrial wastewater, thereby further improving the quality of the effluent.
Drawings
FIG. 1 is a schematic plan view of the integrated industrial wastewater advanced treatment system according to an embodiment of the present invention.
FIG. 2 is a schematic elevation view of a denitrification filter of the combined advanced treatment system for industrial wastewater according to the embodiment of the invention.
FIG. 3 is a schematic elevation view of an air floatation tank of the combined advanced treatment system for industrial wastewater according to an embodiment of the present invention.
FIG. 4 is a schematic plan view of a dosing room of the combined advanced treatment system for industrial wastewater according to an embodiment of the present invention.
The meaning of the reference symbols in the figures: 1. a denitrification filter tank, 1.1.1, a water inlet channel, 1.1.2, a water distribution well, 1.1.3, a water distribution pipe, 1.1.4, a water distribution channel, 1.2.1, a clear water zone, 1.2.2, a denitrification filter tank water outlet channel, 1.2.3, an upper filter plate, 1.2.4, a filter material layer, 1.2.5, a lower cover plate, 1.3.1, a backwashing fan, 1.3.2, a backwashing air inlet pipe, 1.3.3, a backwashing water discharge channel, 1.3.4, a backwashing water discharge pipe, 1.3.5, a backwashing water discharge main channel, 1.3.6, a backwashing water discharge main pipe, 1.3.7, a wastewater tank, 2, an air flotation tank, 2.1, a water distribution chamber, 2.1.1, a water distribution chamber water hole, 2.1.2, a water distribution chamber, a water distribution weir, 2.2, a coagulation chamber, 2.2.1, a coagulation chamber water hole, 2.2.2.2, a coagulation chamber stirring chamber, 2.3, a flocculation chamber, 2.3.1, a water through hole of the flocculation chamber, 2.3.2, a stirring paddle of the flocculation chamber, 2.4, a contact chamber, 2.4.1, a folded plate of the contact chamber, 2.4.2, a dissolved air releaser, 2.4.3, a pressurized dissolved air device, 2.5, a separation chamber, 2.5.1, a water outlet weir, 2.5.2, a scum groove, 2.5.3, a slag scraper, 2.5.4, an adjustable weir plate, 2.5.5, a slag discharge pipe, 2.6, an effluent channel of an air flotation tank, 2.6.1, a backflow pipe, 2.6.2, an air flotation water outlet hole, 2.7, the scum tank, 3, a dosing chamber, 3.1, a carbon source dosing device, 3.2, a dosing device, 3.3, a flocculating agent device, 3.4 and an active carbon dosing device.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following embodiments and accompanying drawings.
Referring to fig. 1, a combined advanced treatment system for industrial wastewater, which comprises a denitrification filter 1, an air flotation tank 2 and a dosing room 3.
Referring to fig. 1 and 2, the denitrification filter 1 is designed for upward flow and adopts light filter materials, and specifically comprises a water distribution system, a filter system, a backwashing system and an auxiliary system. The water distribution system comprises a water inlet channel 1.1.1, a water distribution well 1.1.2, a water distribution pipe 1.1.3 and a water distribution channel 1.1.4. The water inlet channel 1.1.1 is arranged at the top of the denitrification filter 1 and is separated from the water distribution well 1.1.2 by a gate valve, and the bottom of the water distribution well 1.1.2 is connected with the water distribution pipe 1.1.3 and leads to the water distribution channel 1.1.4 at the bottom of each filter. The water distribution pipe 1.1.3 is provided with a water inlet flow meter and a valve. The filtering system comprises a clean water area 1.2.1, a denitrification filter outlet channel 1.2.2, an upper filtering plate 1.2.3, a filtering material layer 1.2.4 and a lower cover plate 1.2.5. The clear water zone 1.2.1 is communicated with the denitrification filter outlet channel 1.2.2 and is separated from the filter material layer 1.2.4 through the upper filter plate 1.2.3, and the filter material layer 1.2.4 is separated from the filter bottom distribution channel 1.1.4 through the lower cover plate 1.2.5. The denitrification filter outlet channel 1.2.2 is provided with a water outlet hole which is communicated with the air flotation tank 2. The backwashing system comprises a backwashing fan 1.3.1, a backwashing air inlet pipe 1.3.2, a backwashing drainage channel 1.3.3, a backwashing drainage pipe 1.3.4, a backwashing drainage main channel 1.3.5, a backwashing drainage main pipe 1.3.6 and a backwashing wastewater pool 1.3.7. The backwashing system adopts a gravity flow backwashing mode, and backwashing water comes from a clear water area 1.2.1 of the filtering system 1.2. The backwashing fan 1.3.1 supplies backwashing air to the denitrification filter 1 through a backwashing air inlet pipe 1.3.2. One side of the backwashing drainage channel 1.3.3 is communicated with a water distribution channel 1.1.4 at the bottom of the filter, and the other side is communicated with a backwashing drainage main channel 1.3.5 through a backwashing drainage pipe 1.3.4. The backwash drainage main channel 1.3.5 is communicated with a backwash wastewater pool 1.3.7 through a backwash drainage main pipe 1.3.6. The backwashing water discharge pipe 1.3.4 is provided with a valve, the backwashing water discharge main pipe 1.3.6 is also provided with a backwashing water discharge flow meter besides the valve, and the backwashing wastewater pool 1.3.7 is provided with a backwashing wastewater pump. The auxiliary system comprises an electric control cabinet, an instrument, a valve, a cover plate, a railing, an electric hoist and the like.
Referring to fig. 1 and fig. 3, the floatation tank 2 is designed for backflow pressurized dissolved air, and specifically comprises a water distribution chamber 2.1, a coagulation chamber 2.2, a flocculation chamber 2.3, a contact chamber 2.4, a separation chamber 2.5, a floatation tank water outlet channel 2.6 and a scum tank 2.7. One side of the water distribution chamber 2.1 of the air flotation tank is communicated with a denitrification filter outlet channel 1.2.2, the bottom of the other side is provided with a water distribution chamber water through hole 2.1.1 communicated with a coagulation chamber 2.2, and a water distribution chamber water distribution weir 2.1.2 is arranged in the water distribution chamber 2.1. One side of the coagulating chamber 2.2 is communicated with the water distribution chamber 2.1, the top of the other side is provided with a water passing hole 2.2.1 of the coagulating chamber, the coagulating chamber is communicated with the flocculation chamber 2.3, and the stirring paddle 2.2.2 of the coagulating chamber is arranged in the coagulating chamber 2.2. One side of the flocculation chamber 2.3 is communicated with the coagulation chamber 2.2, the bottom of the other side is provided with a flocculation chamber water through hole 2.3.1 which is communicated with the contact chamber 2.4, and the flocculation chamber 2.3 is internally provided with a flocculation chamber stirring paddle 2.3.2. One side of the contact chamber 2.4 is communicated with the flocculation chamber 2.3, and the other side is a contact chamber folded plate 2.4.1 which is separated from the separation chamber 2.5. The contact chamber 2.4 is internally provided with a dissolved gas releaser 2.4.2 which is communicated with a pressurized dissolved gas device 2.4.3. One side of the separation chamber 2.5 is communicated with the contact chamber 2.4, and the other side is provided with an effluent weir 2.5.1 which is communicated with an effluent channel 2.6. The separation chamber 2.5 is internally provided with a scum groove 2.5.2, and the top is provided with a scum scraper 2.5.3. The effluent weir 2.5.1 is provided with an adjustable weir plate 2.5.4. The scum trough 2.5.2 is communicated with a scum pool 2.7 through a scum pipe 2.5.5. The water outlet channel 2.6 of the air floatation tank is provided with a return pipe 2.6.1 and an air floatation water outlet hole 2.6.2 which are respectively communicated with a pressurized air dissolving device 2.4.3 and a subsequent treatment unit.
Referring to fig. 1 and 4, the dosing room 3 is composed of a carbon source dosing device 3.1, a coagulant dosing device 3.2, a flocculant dosing device 3.3 and an active carbon dosing device 3.4. The four medicine adding devices are composed of a medicine storage tank, a medicine adding pump and an electric control cabinet. The carbon source dosing device 3.1 is communicated with a denitrification filter water inlet channel 1.1.1 through a carbon source dosing pipe. The coagulant adding device 3.2 is communicated with the coagulation chamber 2.2 of the air flotation tank through a coagulant adding pipe, the flocculant adding device 3.3 is communicated with the flocculation chamber 2.3 of the air flotation tank through a flocculant adding pipe, and the active carbon adding device 3.4 is communicated with one or more of the water distribution chamber 2.1 of the air flotation tank, the coagulation chamber 2.2, the flocculation chamber 2.3 and the contact chamber 2.4 through a carbon slurry adding pipe.
A combined advanced treatment method for industrial wastewater is characterized in that advanced treatment is carried out on effluent of secondary biochemical treatment sequentially through a denitrification filter 1 and an air flotation tank 2.
The effluent of the secondary biochemical treatment enters a water distribution well 1.1.2 through a water inlet channel 1.1.1 at the top of the denitrification filter 1, then enters a water distribution channel 1.1.4 at the bottom of each filter through a water distribution pipe 1.1.3 at the bottom of the water distribution well 1.1.2, sequentially passes through a lower cover plate 1.2.5, a filter material layer 1.2.4, an upper filter plate 1.2.3 and a clear water area 1.2.1 from bottom to top, and finally enters the air flotation tank through a water outlet channel 1.2.2 water outlet hole. In the treatment process of the denitrification filter 1, a carbon source dosing device 3.1 from a dosing room 3 continuously provides a carbon source for a water inlet channel 1.1.1 of the denitrification filter to maintain the normal operation of denitrification reaction.
Regularly or when needed, backwashing the denitrification filter 1, which comprises the following steps:
step 1: and (4) closing a water valve of the filter, isolating the denitrification filter 1 and starting backwashing.
Step 2: and (5) pre-washing with water. Opening a backwashing drainage valve at the bottom of the filter, and performing gravity running water prewashing by using the filter effluent of the clear water zone 1.2.1, wherein the prewashing strength of the water is 50-70 Nm 3 /m 2 h, closing the backwashing drainage valve after 30 to 90 seconds.
And step 3: and (5) exhausting. And opening an exhaust valve, a backwashing air inlet valve and a backwashing fan 1.3.1 at the bottom of the filter, quickly exhausting residual gas and water in the air grids, and closing the exhaust valve after 30-90 s.
And 4, step 4: and (5) air washing. Backwash air enters the filter tank 1 through a backwash air inlet pipe 1.3.2, and the air washing strength is 12-14 Nm 3 /m 2 h, after 2-3 min, the backwashing fan 1.3.1 and the backwashing air inlet valve are closed.
And 5: the exhaust is stable. And opening an exhaust valve, keeping the filter tank 1 in a standing state, enabling the filter material layer 1.2.4 to recover to be stable so as to prevent material leakage during water washing, simultaneously evacuating gas in the air grids, and closing the exhaust valve after 30-90 s.
Step 6: and (5) washing with water. Opening a backwashing drainage valve, and performing gravity flow washing by using the effluent of the filter tank in the clear water area 1.2.1, wherein the washing strength is 50-70 Nm 3 /m 2 h, closing the backwashing drainage valve after 1-2 min.
And 7: and (5) alternately flushing with air and water. The method is the same as air washing and water washing, and the steps of 4-6 are circulated for 2-3 times.
And 8: and (6) rinsing. Similar to water washing, but for a longer time, generally lasting 3-5 min.
And step 9: and (5) opening a water inlet valve of the filter tank after backwashing is finished, and recovering the normal operation of the filter tank 1.
Backwash wastewater enters a backwash drainage channel 1.3.3 through a water distribution channel 1.1.4 at the bottom of the filter 1, then enters a backwash drainage main channel 1.3.5 through a backwash drainage pipe 1.3.4, and finally enters a backwash wastewater pool 1.3.7 through a backwash drainage main pipe 1.3.6. The waste water accumulated in the backwashing waste water tank 1.3.7 is discharged by a water pump at regular intervals.
The water entering the air flotation tank 2 enters the coagulation chamber 2.2 through the water distribution weir 2.1.2 of the water distribution chamber and the water passing hole 2.1.1, is fully mixed with the coagulant from the coagulant adding device 3.2 of the dosing chamber 3 under the rapid stirring of the stirring paddle 2.2.2 of the coagulation chamber, then enters the flocculation chamber 2.3 through the water passing hole 2.2.1 of the coagulation chamber, and is fully flocculated with the flocculant from the flocculant adding device 3.3 of the dosing chamber 3 under the slow stirring of the stirring paddle 2.3.2 of the flocculation chamber to form the alum homogeneous flower. The activated carbon dosing device 3.4 is communicated with one or more of the water distribution chamber 2.1, the coagulation chamber 2.2, the flocculation chamber 2.3 and the contact chamber 2.4 of the air flotation tank through a carbon slurry dosing pipe, and continuously provides carbon slurry for the air flotation tank 2 to remove refractory organic pollutants and chromophores. Sewage carrying alum floc enters a contact chamber 2.4 through a water through hole 2.3.1 of a flocculation chamber, adheres to a large amount of micro bubbles which are released by a dissolved air releaser 2.4.2 and are highly dispersed in water to form foam floc with integral density smaller than that of water, floats to the water surface, is scraped into a scum groove 2.5.2 by a scum scraper 2.5.3 at the top of a separation chamber 2.5 in a scum form, and finally enters a scum tank through a scum pipe 2.5.5. The rest purified water enters an effluent channel 2.6 of the air flotation tank through an effluent weir 2.5.1 of the separation chamber, a part of return water enters a pressurized air dissolving device 2.4.3 through an effluent channel return pipe 2.6.1 of the air flotation tank for preparing high-pressure air dissolving water, and the rest enters a disinfection tank and other subsequent treatment units through an air flotation water outlet hole 2.6.2.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (10)
1. The combined advanced treatment system for industrial wastewater is characterized in that: comprises a denitrification filter tank, an air flotation tank and a dosing room;
the denitrification filter tank is an upward flow filter tank adopting light filter materials and comprises a water distribution system, a filter system and a backwashing system;
the water distribution system comprises a water inlet channel, a water distribution well, a water distribution pipe and a water distribution channel; the water inlet channel is arranged at the top of the denitrification filter and is separated from the water distribution well through a gate valve; the bottom of the water distribution pipe is connected with water distribution pipes which lead to water distribution channels at the bottom of each filter pool, and the water distribution pipes are provided with water inlet flow meters and valves;
the filtering system comprises a clean water area, a water outlet channel, an upper filtering plate, a filtering material layer and a lower cover plate; the clear water area is communicated with a water outlet channel of the denitrification filter and is separated from a filter material layer through an upper filter plate, and the filter material layer is separated from a water distribution channel at the bottom of the filter through a lower cover plate; the water outlet channel of the denitrification filter tank is provided with a water outlet hole which is communicated with the air floatation tank;
the backwashing system comprises a backwashing fan, a backwashing air inlet pipe, a backwashing water drainage channel, a backwashing water drainage pipe, a backwashing water drainage main channel, a backwashing water drainage main pipe and a backwashing wastewater pool; the backwashing system adopts a gravity flow backwashing mode, and backwashing water comes from a clear water area of the filtering system; the backwashing fan supplies backwashing air to the denitrification filter tank through a backwashing air inlet pipe; one side of the backwashing drainage channel is communicated with the water distribution channel at the bottom of the filter tank, and the other side of the backwashing drainage channel is communicated with the backwashing drainage main channel through a backwashing drainage pipe; the backwashing drainage main channel is communicated with a backwashing wastewater pool through a backwashing drainage main pipe;
the air floatation tank is designed for refluxing, pressurizing and dissolving air and comprises a water distribution chamber, a coagulation chamber, a flocculation chamber, a contact chamber, a separation chamber and an air floatation tank water outlet channel;
one side of a water distribution chamber of the air flotation tank is communicated with a denitrification filter outlet channel, the bottom of the other side of the air flotation tank is provided with a water distribution chamber water through hole communicated with a coagulation chamber, and a water distribution chamber water distribution weir is arranged in the water distribution chamber; one side of the coagulating chamber is communicated with the water distribution chamber, the top of the other side of the coagulating chamber is provided with a coagulating chamber water through hole which is communicated with the flocculating chamber, one side of the flocculating chamber is communicated with the coagulating chamber, the bottom of the other side of the flocculating chamber is provided with a flocculating chamber water through hole which is communicated with the contact chamber, one side of the contact chamber is communicated with the flocculating chamber, and the other side of the contact chamber is a contact chamber folded plate which is separated from the separation chamber; one surface of the separation chamber is communicated with the contact chamber, and the other surface of the separation chamber is provided with a water outlet weir which is communicated with a water outlet channel; the water outlet channel of the air flotation tank is provided with a return pipe and an air flotation water outlet hole which are respectively communicated with the pressurization and air dissolution device and the subsequent treatment unit;
the medicine adding device of the medicine adding room comprises: a carbon source dosing device, a coagulant dosing device and a flocculant dosing device;
the carbon source dosing device is communicated with a denitrification filter water inlet channel through a carbon source dosing pipe; the coagulant adding device is communicated with the coagulation chamber of the air flotation tank through a coagulant adding pipe; the flocculating agent dosing device is communicated with the flocculation chamber of the air floatation tank through a flocculating agent dosing pipe.
2. The combined advanced treatment system for industrial wastewater as claimed in claim 1, characterized in that:
the backwashing drainage pipe is provided with a valve, the backwashing drainage main pipe is also provided with a backwashing drainage flowmeter besides the valve, and the backwashing wastewater pool is provided with a backwashing wastewater pump.
3. The combined advanced treatment system for industrial wastewater according to claim 1, characterized in that:
a mixing paddle of the coagulation chamber is arranged in the coagulation chamber; the flocculation chamber is internally provided with a flocculation chamber stirring paddle.
4. The combined advanced treatment system for industrial wastewater according to claim 1, characterized in that:
the contact chamber is internally provided with a dissolved air releaser which is communicated with a pressurizing dissolved air device.
5. The combined advanced treatment system for industrial wastewater according to claim 1, characterized in that:
the separation chamber is internally provided with a scum trough, the top of the separation chamber is provided with a slag scraper, and the effluent weir is provided with an adjustable weir plate. The scum groove is communicated with the scum tank through a scum pipe.
6. The combined advanced treatment system for industrial wastewater according to claim 1, characterized in that:
the dosing devices comprise a medicine storage tank, a dosing pump and an electric control cabinet.
7. The combined advanced treatment system for industrial wastewater as claimed in claim 1, characterized in that:
the dosing device also comprises an active carbon dosing device which is communicated with one or more of the water distribution chamber, the coagulation chamber, the flocculation chamber and the contact chamber of the air flotation tank through a carbon slurry dosing pipe.
8. A combined advanced treatment method for industrial wastewater is characterized in that: carrying out advanced treatment on water to be treated by using the industrial wastewater combined advanced treatment system of any one of claims 1 to 7;
water to be treated enters a water distribution well through a water inlet channel at the top of the denitrification filter, then enters a water distribution channel at the bottom of each filter through a water distribution pipe at the bottom of the water distribution well, sequentially passes through a lower cover plate, a filter material layer, an upper filter plate and a clear water area from bottom to top, and finally enters an air flotation tank through a water outlet hole of a water outlet channel of the denitrification filter;
backwashing the denitrification filter, wherein backwashing wastewater enters a backwashing drainage channel through a water distribution channel at the bottom of the filter tank, then enters a backwashing drainage main channel through a backwashing drainage pipe, and finally enters a backwashing wastewater pool through a backwashing drainage main pipe;
the water entering the air flotation tank enters the coagulation chamber through the water distribution weir and the water through hole of the water distribution chamber, is fully mixed with the coagulant from the dosing device of the coagulant in the dosing room under the rapid stirring of the stirring paddle of the coagulation chamber, then enters the flocculation chamber through the water through hole of the coagulation chamber, and is fully flocculated with the flocculant from the dosing device of the flocculant in the dosing room under the slow stirring of the stirring paddle of the flocculation chamber to form homogeneous alum floc;
sewage carrying alum floc enters the contact chamber through the water holes of the flocculation chamber, adheres to a large amount of micro bubbles which are released by the dissolved air releaser and are highly dispersed in water to form foam floc with integral density smaller than that of water, floats to the water surface, is scraped into a scum groove by a scum scraper at the top of the separation chamber in a scum form, and finally enters a scum tank through a scum pipe; the rest purified water enters the water outlet channel of the air flotation tank through the water outlet weir of the separation chamber, a part of backflow water enters the pressurized air dissolving device through the return pipe of the water outlet channel of the air flotation tank for preparing high-pressure air dissolving water, and the rest part of backflow water enters the subsequent treatment units such as the disinfection tank through the water outlet hole of the air flotation tank.
9. The combined advanced treatment method for industrial wastewater according to claim 8, wherein the backwashing of the denitrification filter comprises the following steps:
step 1, closing a water inlet valve of a denitrification filter, isolating the denitrification filter, and starting backwashing;
step 2, water prewashing: opening a backwashing drain valve at the bottom of the denitrification filter tank, and performing gravity running water prewashing by using the filter tank effluent water in the clear water area, wherein the prewashing strength of the water is 50-70 Nm 3 /m 2 h, closing the backwashing drainage valve after 30-90 s;
and step 3, exhausting: opening an exhaust valve, a backwashing air inlet valve and a backwashing fan at the bottom of the denitrification filter, quickly emptying residual gas and water in the air grid, and closing the exhaust valve after 30-90 s;
step 4, air washing: backwash air enters the denitrification filter tank through a backwash air inlet pipe, and the air washing strength is 12-14 Nm 3 /m 2 h, closing the backwashing fan and the backwashing air inlet valve after 2-3 min;
and 5, exhausting stably: opening an exhaust valve, keeping the filter chamber in a standing state, and closing the exhaust valve after 30-90 s;
step 6, washing: opening a backwashing drainage valve, and performing gravity flow washing by using the outlet water of the filter tank in the clear water area, wherein the washing strength is 50-70 Nm 3 /m 2 h, closing the backwashing drainage valve after 1-2 min;
step 7, alternately flushing with air and water: step 4-6, circulating for 2-3 times;
and 8, rinsing: opening a backwashing drainage valve, and performing gravity flow washing by using the outlet water of the filter tank in the clear water area, wherein the washing strength is 50-70 Nm 3 /m 2 h, closing the backwashing drainage valve after 3-5 min;
and 9, after backwashing is finished, opening a water inlet valve of the denitrification filter, and recovering the normal operation of the filter.
10. The combined advanced treatment method for industrial wastewater according to claim 8, characterized in that:
the activated carbon dosing device is communicated with one or more of the water distribution chamber, the coagulation chamber, the flocculation chamber and the contact chamber of the air flotation tank through a carbon slurry dosing pipe, so that carbon slurry is continuously provided for the air flotation tank, and organic pollutants and chromophores which are difficult to degrade are removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211227629.0A CN115521028A (en) | 2022-10-09 | 2022-10-09 | Combined advanced treatment system and method for industrial wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211227629.0A CN115521028A (en) | 2022-10-09 | 2022-10-09 | Combined advanced treatment system and method for industrial wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115521028A true CN115521028A (en) | 2022-12-27 |
Family
ID=84701212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211227629.0A Pending CN115521028A (en) | 2022-10-09 | 2022-10-09 | Combined advanced treatment system and method for industrial wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115521028A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107968A (en) * | 2011-01-20 | 2011-06-29 | 山东建筑大学 | Water purification system and water purification method of flotation filter tank |
| CN208869405U (en) * | 2018-05-15 | 2019-05-17 | 苏伊士水务工程有限责任公司 | Air floatation filter tank and water treatment system comprising same |
| CN110818205A (en) * | 2019-12-03 | 2020-02-21 | 鞍钢集团工程技术有限公司 | System and process for reducing concentration of pollutants in steel comprehensive wastewater |
| CN111302486A (en) * | 2020-04-02 | 2020-06-19 | 江苏道科环境科技有限公司 | Upward-flow light-weight filter material biological filter |
| CN114291964A (en) * | 2021-12-10 | 2022-04-08 | 无锡市政设计研究院有限公司 | Sewage treatment system and method for denitrification and phosphorus recovery |
-
2022
- 2022-10-09 CN CN202211227629.0A patent/CN115521028A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107968A (en) * | 2011-01-20 | 2011-06-29 | 山东建筑大学 | Water purification system and water purification method of flotation filter tank |
| CN208869405U (en) * | 2018-05-15 | 2019-05-17 | 苏伊士水务工程有限责任公司 | Air floatation filter tank and water treatment system comprising same |
| CN110818205A (en) * | 2019-12-03 | 2020-02-21 | 鞍钢集团工程技术有限公司 | System and process for reducing concentration of pollutants in steel comprehensive wastewater |
| CN111302486A (en) * | 2020-04-02 | 2020-06-19 | 江苏道科环境科技有限公司 | Upward-flow light-weight filter material biological filter |
| CN114291964A (en) * | 2021-12-10 | 2022-04-08 | 无锡市政设计研究院有限公司 | Sewage treatment system and method for denitrification and phosphorus recovery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101261839B1 (en) | Treatment system for side stream | |
| CN104341054B (en) | Realize Treated sewage reusing intelligent integral equipment and its application of sewage zero-discharge | |
| CN209797712U (en) | Medium-high concentration comprehensive sewage nitrogen and phosphorus removal treatment system | |
| CN107673505B (en) | Air-flotation built-in ceramic membrane water purification system and method | |
| CN207193070U (en) | A kind of efficient equipment for processing industrial sewage | |
| CN104445838B (en) | A kind of small-town sewage treatment system | |
| CN203845900U (en) | Organic sewage treatment device in lab | |
| CN209161794U (en) | It is a kind of for handling the integrated high-efficiency sewage treatment device of city domestic sewage | |
| CN116477792A (en) | Integrated intelligent sewage treatment system and process | |
| CN206396000U (en) | Aquaculture wastewater processing system | |
| CN115521028A (en) | Combined advanced treatment system and method for industrial wastewater | |
| CN205328795U (en) | Wet spinning acrylic fibres production polymerization effluent disposal system | |
| CN107585896B (en) | Solid impurity sewage treatment device and method | |
| CN209161799U (en) | Unpowered full-buried type rural domestic waste processing unit | |
| CN109081413B (en) | Water circulation separation system for waste residues of grinding materials | |
| CN106630258A (en) | Comprehensive power station wastewater treatment device | |
| CN208218511U (en) | The processing unit of high-concentration sewage | |
| CN204058177U (en) | A kind of deep treatment system of papermaking wastewater | |
| CN213012497U (en) | River course sewage microorganism intensive treatment system | |
| CN215627392U (en) | Integrated device of pressure type tubular ceramic membrane in surface water deep purification treatment | |
| CN210656389U (en) | Be used for black and odorous water body BAF processing apparatus | |
| CN108503067A (en) | Industrial sewage treatment technology containing heavy metal | |
| CN219259760U (en) | Intensive advanced treatment device for sewage in small towns | |
| CN215208965U (en) | Dense medium magnetic coagulation high-efficiency integrated shale gas extraction water purification device | |
| CN215517064U (en) | Integrated water purifier for river channel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |