CN113135623B - Water treatment device and method for modifying advection sedimentation tank - Google Patents
Water treatment device and method for modifying advection sedimentation tank Download PDFInfo
- Publication number
- CN113135623B CN113135623B CN202110598185.0A CN202110598185A CN113135623B CN 113135623 B CN113135623 B CN 113135623B CN 202110598185 A CN202110598185 A CN 202110598185A CN 113135623 B CN113135623 B CN 113135623B
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- water
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- advection sedimentation
- sedimentation tank
- scum
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 212
- 238000004062 sedimentation Methods 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000002893 slag Substances 0.000 claims abstract description 45
- 238000007790 scraping Methods 0.000 claims abstract description 33
- 238000005189 flocculation Methods 0.000 claims abstract description 32
- 230000016615 flocculation Effects 0.000 claims abstract description 31
- 238000011010 flushing procedure Methods 0.000 claims abstract description 30
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 239000007921 spray Substances 0.000 claims abstract description 7
- 230000003311 flocculating effect Effects 0.000 claims abstract description 4
- 238000005192 partition Methods 0.000 claims description 38
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 28
- 229910052742 iron Inorganic materials 0.000 claims description 22
- 239000010802 sludge Substances 0.000 claims description 18
- 241000195493 Cryptophyta Species 0.000 claims description 17
- -1 iron ion Chemical class 0.000 claims description 16
- 238000010408 sweeping Methods 0.000 claims description 16
- 230000007246 mechanism Effects 0.000 claims description 11
- 239000013049 sediment Substances 0.000 claims description 11
- 239000008394 flocculating agent Substances 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 5
- 239000000701 coagulant Substances 0.000 claims description 5
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 abstract description 12
- 238000002407 reforming Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 23
- 239000007789 gas Substances 0.000 description 22
- 230000000694 effects Effects 0.000 description 10
- 239000012535 impurity Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 6
- 230000036284 oxygen consumption Effects 0.000 description 5
- 238000005188 flotation Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- WAEMQWOKJMHJLA-UHFFFAOYSA-N Manganese(2+) Chemical compound [Mn+2] WAEMQWOKJMHJLA-UHFFFAOYSA-N 0.000 description 1
- 244000080575 Oxalis tetraphylla Species 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001437 manganese ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/003—Sedimentation tanks provided with a plurality of compartments separated by a partition wall
- B01D21/0033—Vertical, perforated partition walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
- B01D21/04—Settling tanks with single outlets for the separated liquid with moving scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2433—Discharge mechanisms for floating particles
- B01D21/2438—Discharge mechanisms for floating particles provided with scrapers on the liquid surface for removing floating particles
-
- 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
- C02F2001/007—Processes including a sedimentation step
Abstract
The application provides a water treatment device and a water treatment method for modifying a horizontal flow sedimentation tank, and belongs to the technical field of water treatment. The water treatment device comprises a flocculation tank, a advection sedimentation tank, a gas dissolving device and a slag scraping device. The flocculation tank is used for flocculating the flocculant and raw water to form large flocs. The advection sedimentation tank is divided into a contact area, an air floatation area and an advection sedimentation area in sequence, and the advection sedimentation area is used for settling floccules. The dissolved air releaser of the dissolved air device is arranged at one end part of the pipeline and is used for being arranged in the contact area and releasing micro bubbles into the contact area, and the other end of the pipeline is used for being communicated with the water collecting well. The slag discharging groove of the slag scraping device is arranged at one side of the upper end of the air floatation area, which is close to the sedimentation area, the scum flushing water pipe is arranged at the upper end of the air floatation area, and the water sprayed by the plurality of spray holes is used for flushing scum on the surface of the air floatation area into the slag discharging groove. The air floatation and precipitation switching operation can be realized by reforming in the advection sedimentation tank, and a new device is not needed.
Description
Technical Field
The application relates to the technical field of water treatment, in particular to a water treatment device and a water treatment method for modifying a horizontal sedimentation tank.
Background
The invention discloses a solid-liquid separation device and an operation method of a switchable operation air floatation or precipitation process for water treatment, which are disclosed in the patent publication No. CN 107986511A (patent No. 201711496985.1) and are named as an air floatation and precipitation solid-liquid separation device and a treatment method for water treatment. The flocculation tank is composed of four reaction sections and a transition section, the reaction sections are directly formed by vertical shafts through wall body intervals, and small-hole grid plates are arranged in the vertical shafts, and meanwhile, the water treatment gas flotation and precipitation solid-liquid separation method is disclosed. The invention optimizes the structure of the air floatation and precipitation solid-liquid separation device and can achieve good treatment effect. However, the invention has a complex structure and needs to build a new device, thereby increasing the manufacturing cost of the device.
Disclosure of Invention
The application provides a water treatment device and a water treatment method for horizontal sedimentation tank transformation, which can realize air floatation and sedimentation switching operation by transformation in a horizontal sedimentation tank without a newly-built device.
In a first aspect, the present application provides a water treatment device for advection sedimentation tank modification, including a flocculation tank, an advection sedimentation tank, a gas dissolving device and a slag scraping device.
The flocculation tank is used for flocculating the flocculant and raw water to form large flocs. The advection sedimentation tank is arranged at the rear end of the flocculation tank, a closed partition wall, a detachable partition wall and a perforated flower wall are sequentially arranged in the advection sedimentation tank, and the advection sedimentation tank is sequentially divided into a contact area, an air floatation area and an advection sedimentation area; a distance is reserved between the lower end of the closed partition wall and the bottom of the advection sedimentation tank, and the distance is used for enabling the lower end of the flocculation tank to be communicated with the contact area; the lower end of the detachable partition wall is connected with the bottom of the advection sedimentation tank, and a distance is reserved between the upper end of the detachable partition wall and the top of the advection sedimentation tank, so that the upper end of the contact area is communicated with the air floatation area; the perforated wall connects the advection sedimentation zone with the air floatation zone for settling floc.
The gas dissolving device comprises a gas dissolving pump, a gas-water separator, a pipeline and a gas dissolving releaser, wherein the gas dissolving pump and the gas-water separator are sequentially arranged on the pipeline, the gas dissolving releaser is arranged at one end part of the pipeline and is used for being arranged in the contact area and releasing micro bubbles into the contact area, and the other end of the pipeline is used for being communicated with the water collecting well.
The scum scraping device comprises a scum flushing water pipe with a plurality of jet holes and a scum discharging groove, wherein the scum discharging groove is arranged at one side of the upper end of the air floatation area, which is close to the sedimentation area, the scum flushing water pipe is arranged at the upper end of the air floatation area, and the water sprayed by the jet holes is used for sweeping scum on the surface of the air floatation area into the scum discharging groove.
The device can be operated as a precipitation process and an air floatation process. If the device runs in a sedimentation process, the detachable partition wall is removed, the gas dissolving device and the slag scraping device do not work, the flocculating agent and suspended matters in raw water form flocs in the flocculation tank, and the flocs and water pass through the air flotation area together and naturally settle after entering the advection sedimentation area, so that the raw water is treated.
If the device runs by an air floatation process, a detachable partition wall is installed, an air dissolving device and a slag scraping device work, a flocculating agent and suspended matters in raw water form flocs in a flocculation tank, the flocs and water enter a contact area together, after the air dissolving pump is connected with a water collecting well through a pipeline, an impeller rotating at a high speed in the air dissolving pump forms vacuum at a water inlet after the air dissolving pump absorbs water, air is sucked, liquid and air are stirred into vortex flow in a pump body by the impeller, the impeller is continuously pressurized to form tiny bubbles, then air separated out from the dissolved air water is separated by a gas-water separator, the tiny bubbles are released to the contact area by a dissolved air releaser, the released tiny bubbles have strong surface free energy, can adhere to destabilized flocs impurities in the water, and scum rising to the water surface is formed in the air floatation area. Then the scum is swept into the slag discharge groove by the water ejected by the scum sweeping water pipe, and the water enters a advection sedimentation area for sedimentation, so that raw water is treated.
Optionally, the direction from the air floating area to the advection sedimentation area is a preset direction, the axial extension direction of the scum flushing water pipe is perpendicular to the preset direction, and the axial lines of the plurality of spray holes on the scum flushing water pipe are all inclined downwards towards the advection sedimentation area.
More scum can be swept to the scum groove, and a scum sweeping water pipe is arranged in the direction, the flow direction of water sprayed by the spray hole is consistent with the flow direction of raw water in treatment, and the consumption of water can be reduced.
Optionally, the slag scraping device further comprises a motor and a lifting mechanism, wherein the lifting mechanism is arranged on the hard slag flushing water pipe, and the motor is connected with the lifting mechanism in a driving way and is used for enabling the slag flushing water pipe to move up and down or/and horizontally.
The slag scraping device can sweep more scum in the air floatation area so as to facilitate the subsequent sedimentation treatment, thereby ensuring better water treatment effect.
Optionally, the slag scraping device further comprises a hose and a hanging pipe ring, the hose is arranged at one end of the scum sweeping water pipe and is communicated with the scum sweeping water pipe, a plurality of hanging pipe rings at intervals are arranged at the upper end of one side wall of the air floatation area, and the hose is hung on the hanging pipe rings.
Through the setting of hose, can make things convenient for the dross to dash the horizontal movement of water pipe, can cooperate with the hose, make the dross effect of scraping of dross device better. And the hose can provide a water source for the scum flushing water pipe so as to facilitate the subsequent flushing.
Optionally, the distance between the closed partition wall and the bottom of the advection sedimentation tank is 1m, the distance between the lower end of the perforated flower wall and the bottom of the advection sedimentation tank is 1m, and the height of the detachable partition wall is 1.8-2 m.
The substances discharged from the flocculation tank basically enter the contact area and are fully contacted with the micro bubbles released by the dissolved air releaser, so that the flocculation can be treated more fully.
Optionally, the bottom of advection sedimentation tank all is provided with a plurality of sludge collection pits, and every sludge collection pit is provided with the mud pipe, and the bottom of advection sedimentation tank is provided with the scraper for scrape into the sludge collection pit with the deposit and discharge through the mud pipe. Can discharge impurities at the bottom of the advection sedimentation tank.
In a second aspect, the present application provides a method for water treatment, suitable for use in the above water treatment apparatus, comprising the steps of:
(1) Detecting the water quality of the raw water to obtain indexes of turbidity, algae quantity and iron ion concentration of the raw water;
(2) When the turbidity of the raw water is higher than 50NTU, or the algae quantity is less than 100 ten thousand cells/L, or the iron ion concentration is less than 1.0mg/L, the detachable partition wall is removed, the gas dissolving device and the slag scraping device do not work, the raw water flocculates with a flocculating agent in a flocculation tank, and then enters a advection sedimentation area for sedimentation.
When the turbidity of raw water is lower than 5NTU, or the algae quantity is higher than 2000 ten thousand cells/L, or the iron ion concentration is higher than 2.0mg/L, a detachable partition wall is arranged, a gas dissolving device and a slag scraping device work, raw water flocculates with a flocculating agent in a flocculation tank and then enters a contact area, and is mixed with micro bubbles released in a gas dissolving releaser to form scum, and the scum enters an air floatation area, and the scum on the air floatation area is discharged through the slag scraping device and then enters a advection sedimentation area.
Wherein, the adding amount of the aluminum-containing or iron-containing salt flocculant is 8-50 mg/L; or, the adding amount of the polymer flocculant containing aluminum or iron is 3-40 mg/L; the adding amount of coagulant aid sodium hypochlorite is 4-40 mg/L.
The running mode of the device is adjusted according to indexes such as turbidity, algae quantity or iron ion concentration of raw water, so that good treatment effect can be achieved by adjusting the running mode under the condition that the raw water is complex and changeable, and the safety and the quality of water quality are guaranteed.
Optionally, in order to form more suspended matter in the raw water into flocs.
Optionally, the dissolved air releaser comprises a plurality of dissolved air releasers, the outlet flow rate of each dissolved air releaser is 0.4-0.5 m/s, the opening degree of each dissolved air releaser is 5mm, and the action range of each dissolved air releaser is 30-100 cm. More flocs in the contact area can be scummed for removal.
Alternatively, the microbubbles have a diameter of 20 to 40. Mu.m. The free energy of the surface of the micro-bubbles is larger, and more destabilized floc impurities in the water can be adhered to form scum.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a water treatment device modified by a horizontal sedimentation tank according to an embodiment of the present application.
Icon: 1-a water outlet pipe of a sand filter; 2-a dissolved air pump; 3-a dissolved air tube; 4-a pressure gauge; a 5-gas-water separator; 6-a dissolved air tube; 7-flocculation tank; 8-closing the partition wall; 9-a mud pipe; 10-a dissolved gas releaser; 11-a detachable partition; 12-contact region; 13-an air floatation zone; 14-perforating the patterned wall; 15-a advection sedimentation zone; 16-a mud scraper; 17-a water collection tank; 18-a slag discharge groove; 19-hose; 20-hanging a pipe ring; 21-a lifting mechanism; 22-scum flushing water pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
The application provides a water treatment facilities that advection sedimentation tank reformed transform, including flocculation tank 7, advection sedimentation tank, dissolved air device and sediment device of scraping.
Wherein the flocculation tank 7 is used for flocculating a flocculant and raw water to form large flocs. The advection sedimentation tank is arranged at the rear end of the flocculation tank 7, a closed partition wall 8, a detachable partition wall 11 and a perforated flower wall 14 are sequentially arranged in the advection sedimentation tank, and the advection sedimentation tank is sequentially divided into a contact area 12, an air floatation area 13 and an advection sedimentation area 15; a distance is arranged between the lower end of the closed partition wall 8 and the bottom of the advection sedimentation tank, and the distance is used for communicating the lower end of the flocculation tank 7 with the contact area 12; the lower end of the detachable partition wall 11 is connected with the bottom of the advection sedimentation tank, and a distance is reserved between the upper end of the detachable partition wall 11 and the top of the advection sedimentation tank, so that the upper end of the contact zone 12 is communicated with the air floatation zone 13; perforated wall 14 communicates advection settling zone 15 with air bearing zone 13 for settling flocs.
If the device operates in a precipitation process, the detachable partition wall 11 is removed, the air dissolving device and the slag scraping device do not work, the flocculating agent and suspended matters in raw water form flocs in the flocculation tank 7, and the flocs and water pass through the air floatation area 13 together and naturally settle after entering the advection precipitation area 15, so that the raw water is treated.
If the device operates in an air floatation process, the detachable partition wall 11 is installed, the air dissolving device and the slag scraping device work, the flocculating agent and suspended matters in raw water form flocs in the flocculation tank 7, the flocs and water enter the contact area 12 together, micro bubbles are generated through the air dissolving device, destabilized flocs impurities in the water are adhered, and scum rising to the water surface is formed in the air floatation area 13. And then the scum is swept by a scum scraping device, and water enters a advection sedimentation zone 15 for sedimentation, so that raw water is treated.
In this application, dissolve gas device and include dissolved air pump 2, gas-water separator 5, pipeline and dissolved air releaser 10, dissolved air pump 2 and gas-water separator 5 set gradually in the pipeline, and dissolved air releaser 10 sets up in the one end of pipeline, and is used for setting up in contact zone 12 and releasing the microbubble to in the contact zone 12, and the other end of pipeline is used for the intercommunication sump pit.
After the water-dissolving pump 2 is connected with the water collecting well through a pipeline, the impeller rotating at high speed in the water-dissolving pump 2 forms vacuum at the water inlet, gas is sucked, liquid and gas are stirred into vortex flow in the pump body by the impeller, microbubbles are formed by continuously pressurizing the impeller, then air separated out of the dissolved air water is separated out through the gas-water separator 5, the microbubbles are released to the contact area 12 through the dissolved air releaser 10, the released microbubbles have strong surface free energy, destabilized floc impurities in the water can be adhered, and scum rising to the water surface is formed in the air floating area 13.
Alternatively, the microbubbles have a diameter of 20 to 40 μm. Illustratively, the microbubbles have a diameter of 20 μm, 25 μm, 30 μm, 35 μm or 40 μm.
Optionally, the water collecting well behind the sand filter is communicated with the dissolved air pump 2 through the water outlet pipe 1 of the sand filter, and water outlet of the sand filter is adopted for backflow so as to avoid blocking the dissolved air releaser 10. The gas dissolving pump 2 is communicated with the gas-water separator 5 through a gas dissolving pipe 3, the gas-water separator 5 is communicated with the gas dissolving releaser 10 through a gas dissolving pipe 6, the gas-water separator 5 is provided with a pressure gauge 4, and the pressure is maintained between 0.3 and 0.35MPa during operation.
The flow rate of the pipeline in front of the dissolved air releaser 10 is below 1m/s, the outlet flow rate of the dissolved air releaser 10 is 0.4-0.5 m/s, the opening degree of a narrow gap is 5mm during flushing, the action range of each dissolved air releaser 10 is 30-100 cm, and the arrangement quantity of the dissolved air releasers 10 is 24-32/ten thousand m 3 And (5) designing the scale. More flocs in contact region 12 may be scummed for removal thereof.
In this application, scrape sediment device including having the dross that a plurality of jet orifices and dash and sweep water pipe 22 and sediment groove 18, sediment groove 18 sets up in the one side that is close to sedimentation zone 15 of the upper end in air supporting district 13, and dross sweeps water pipe 22 and sets up in the upper end in air supporting district 13, and the water that a plurality of jet orifices sprayed out is used for sweeping the dross on air supporting district 13 surface to sediment inslot 18.
The scum flushing water pipe 22 controls whether the jet hole jets water or not through the valve, the scum in the air floating area 13 is flushed into the slag discharging groove 18 through the water jetted by the scum flushing water pipe 22, and the water enters the advection sedimentation area 15 for sedimentation, so that raw water is treated.
Optionally, the direction from the air floating area 13 to the advection sedimentation area 15 is a preset direction, the axis extending direction of the scum flushing water pipe 22 is perpendicular to the preset direction, and the axes of the plurality of spray holes on the scum flushing water pipe 22 are all inclined downwards towards the advection sedimentation area 15.
More scum can be swept to the scum trough 18, and the scum sweeping water pipe 22 is installed in the direction, and the flow direction of water ejected from the jet holes is consistent with the flow direction of raw water in treatment, so that the water consumption can be reduced.
Optionally, the slag scraping device further comprises a motor and a lifting mechanism 21, wherein the lifting mechanism 21 is arranged on the hard slag flushing water pipe 22, and the motor is connected with the lifting mechanism 21 in a driving way and is used for enabling the slag flushing water pipe 22 to move up and down or/and horizontally.
The slag scraping device can sweep more scum in the air floatation zone 13 so as to facilitate the subsequent sedimentation treatment, thereby leading to better water treatment effect.
Optionally, the slag scraping device further comprises a hose 19 and a hanging pipe ring 20, the hose 19 is arranged at one end of the scum sweeping water pipe 22 and is communicated with the scum sweeping water pipe 22, a plurality of hanging pipe rings 20 with intervals are arranged at the upper end of one side wall of the air floatation area 13, and the hose 19 is hung on the hanging pipe rings 20.
Through the setting of hose 19, can make things convenient for the horizontal movement of dross sweeping water pipe 22, can cooperate with hose 19, make the sediment effect of scraping of sediment device better. And the hose 19 can provide a source of water for the scum sweeping water pipe 22 for subsequent sweeping.
The slag discharge groove 18 is arranged on the perforated patterned wall 14, the scum flushing water pipe 22 spans the air floating area 13 by adopting a stainless steel pipe, lifting is realized by a screw lifting mechanism 21 at two ends so as to keep 8-10 mm away from the water surface above the water surface, water flow can be sprayed out from spraying holes with the diameter of 2.0mm at intervals of 10mm at the lower part of the front side of the pipe for flushing, a hose 19 which penetrates through a hanging pipe ring 20 to hang is adopted at the edge of the air floating area 13 by a pipeline connected with the scum flushing water pipe 22, and thus, the scum flushing water pipe 22 moves back and forth through motor driving, and all scum can be flushed into the slag discharge groove 18 is ensured. Because the water treatment amount of the water works in the high and low peak periods of water supply can be different, the scum flushing water pipe 22 can be adjusted in height so as to meet the requirement of different water levels in the pool and realize effective flushing.
Optionally, the distance between the closed partition wall 8 and the bottom of the advection sedimentation tank is 1m, the distance between the lower end of the perforated flower wall 14 and the bottom of the advection sedimentation tank is 1m, and the height of the detachable partition wall 11 is 1.8-2 m.
The material discharged from the flocculation basin 7 can be basically introduced into the contact area 12 and is in more sufficient contact with the microbubbles released by the dissolved air releaser 10, so that the flocs can be treated more sufficiently.
The contact area 12 needs to be filled with water from the front flocculation tank 1 to the bottom 1m of the closed partition wall 8 of the advection sedimentation area 15, and then the detachable partition wall 11 with the height of 1.8-2.0 m is built from the position of the closed partition wall 8 along the water flow direction 2m to form the contact area 12, and the detachable partition wall 11 is used when the air floatation process is operated, and can be detached when the sedimentation process is operated.
Optionally, a plurality of sludge collecting pits (one or more are arranged at the bottom of the contact area 12 and the bottom of the advection sedimentation area 15) are arranged at the bottom of the advection sedimentation tank, each sludge collecting pit is provided with a sludge discharge pipe 9, and a sludge scraper 16 is arranged at the bottom of the advection sedimentation tank for scraping sediment into the sludge collecting pits and discharging the sediment through the sludge discharge pipe 9. Can discharge impurities at the bottom of the advection sedimentation tank.
The bottom hollow perforated wall 14 is built at the position about 15-20 m behind the front end of the advection sedimentation zone 15 to form the air floatation zone 13 (the work of the bottom mud scraper 16 is not influenced), the mud scraper 16 needs to be an underwater mud scraper, and if the original mud scraper of the advection sedimentation zone 15 is of other types, the mud scraper needs to be modified to meet the mud scraping operation of the air floatation zone 13.
The water treatment method suitable for the water treatment device comprises the following steps:
(1) Detecting the water quality of the raw water to obtain indexes of turbidity, algae quantity and iron ion concentration of the raw water; optionally, the index may also be turbidity, algae, pH, ammonia nitrogen, oxygen consumption, iron ion concentration, manganese ion concentration, etc.
(2) When the turbidity of the raw water is higher than 50NTU, or the algae quantity is less than 100 ten thousand cells/L, or the iron ion concentration is less than 1.0mg/L, the detachable partition wall 11 is removed, the gas dissolving device and the slag scraping device do not work, the raw water flocculates with a flocculating agent in the flocculation tank 7, and then enters the advection sedimentation zone 15 for sedimentation.
When the sedimentation process is operated, raw water added with flocculant enters a flocculation tank 7 to form flocs with suspended matters in water through collision of flocculant, then enters a advection sedimentation area 15, the flocs naturally settle in the advection sedimentation area 15, and the flocs are scraped into a sludge collecting pit by a sludge scraper 16 and discharged through a sludge discharge pipe 9. The precipitated clean water is collected by a water collecting tank 17 and flows into the subsequent process.
When the turbidity of raw water is lower than 5NTU, or the algae quantity is more than 2000 ten thousand cells/L, or the iron ion concentration is more than 2.0mg/L, a detachable partition wall 11 is arranged, a gas dissolving device and a slag scraping device work, raw water is flocculated with a flocculating agent in a flocculation tank 7, then enters a contact area 12, is mixed with micro bubbles released in a gas dissolving releaser to form scum, enters an air floatation area 13, and the scum on the air floatation area 13 is discharged through the slag scraping device and then enters a advection sedimentation area 15.
When the air floatation process is operated, raw water to which flocculant is added enters a flocculation tank 7, and the raw water collides with flocculant and suspended matters in water to form flocs, and water enters a contact area 12 from the bottom through a closed partition wall 8 connected with a advection sedimentation area 15 of the flocculation tank 7, is mixed with dissolved air and water released by a dissolved air releaser 10, and flows into the contact area 12. In the contact zone 12, the released microbubbles have strong surface free energy, can adhere to destabilized floc impurities in water, form scum rising to the water surface in the air flotation zone 12, and sweep the scum to the slag discharge groove 18 to be discharged through the water flow sprayed by the scum sweeping water pipe 22. The accumulated mud at the bottom of the tank is scraped into a mud collecting pit by a mud scraper 16 and discharged through a mud discharging pipe 9, and the water after impurity removal is collected by a water collecting tank 17 and flows into the subsequent process.
It should be noted that: turbidity is a priority when three conditions of turbidity, algae and iron cross; other conditions can be selected according to actual comparison, and the precipitation process can be selected preferentially when the effect difference is small because the cost of the air floatation process is slightly high.
In the application, the adding amount of the aluminum-containing or iron-containing salt flocculant is 8-50 mg/L. Or, the adding amount of the polymer flocculant containing aluminum or iron is 3-40 mg/L; the adding amount of coagulant aid sodium hypochlorite is 4-40 mg/L. So that more suspended matters in the raw water form flocs.
The water treatment device and the method for reforming the advection sedimentation tank provided by the application have the beneficial effects that: the water treatment device obtained by transformation on the basis of the advection sedimentation tank can realize the switching operation of the sedimentation process and the air floatation process. And the operation mode is adjusted according to the values of indexes such as the turbidity of raw water, the algae quantity, the iron ion concentration and the like, so that a good treatment effect can be achieved, and stable and efficient operation is realized.
Specific examples are provided below to illustrate the operation of the horizontal sedimentation tank retrofit water treatment device provided herein.
Example 1 treatment of reservoir raw Water (running an air flotation Process)
Detecting the quality of raw water, and obtaining a detection result according to the quality index of raw water: the turbidity of raw water is 5.5NTU, the algae quantity is 5600 ten thousand cells/L, the iron ion concentration is 0.4mg/L, and the oxygen consumption is 4.6mg/L.
According to the indexes, the running mode is determined to be an air floatation process, the flocculant adopts polyaluminium chloride, the adding amount of the flocculant is determined to be 6mg/L according to the similar historical raw water quality, meanwhile, 5mg/L of sodium hypochlorite coagulant aid is added, the reflux ratio is 6%, and the solution pressure is 0.32MPa.
After the air floatation process, the indexes of the obtained water are as follows: the turbidity of the effluent water of the advection sedimentation tank is 0.7NTU, the algae quantity is 120 ten thousand cells/L, the iron ion concentration is 0.09mg/L, and the oxygen consumption is 1.9mg/L. The treatment effect of the raw water is good.
Example 2 treatment of raw river water (running precipitation Process)
Detecting the quality of raw water, and obtaining a detection result according to the quality index of raw water: the turbidity of the raw water is 187NTU, the algae quantity is 1300 ten thousand cells/L, the concentration of iron ions is 0.5mg/L, and the oxygen consumption is 5.7mg/L.
According to the index, the operation mode is determined to be a precipitation process, the flocculant adopts polyaluminium chloride, the adding amount of the flocculant is determined to be 19mg/L according to the similar historical raw water quality, and meanwhile, the sodium hypochlorite coagulant aid is added to be 6mg/L.
After the precipitation process, the indexes of the obtained water are as follows: the turbidity of the effluent water of the advection sedimentation tank is 1.5NTU, the algae quantity is 90 ten thousand cells/L, the iron ion concentration is 0.12mg/L, and the oxygen consumption is 2.2mg/L. The treatment effect of the raw water is good.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (7)
1. A method of water treatment, suitable for use in a water treatment apparatus, wherein the water treatment apparatus is a modified horizontal sedimentation tank water treatment apparatus, the water treatment apparatus comprising:
a flocculation tank for flocculating a flocculant and raw water to form large flocs;
the advection sedimentation tank is arranged at the rear end of the flocculation tank, a closed partition wall, a detachable partition wall and a perforated flower wall are sequentially arranged in the advection sedimentation tank, and the advection sedimentation tank is sequentially divided into a contact area, an air floatation area and an advection sedimentation area; a distance is reserved between the lower end of the closed partition wall and the bottom of the advection sedimentation tank, and the distance is used for enabling the lower end of the flocculation tank to be communicated with the contact area; the lower end of the detachable partition wall is connected with the bottom of the advection sedimentation tank, and a distance is reserved between the upper end of the detachable partition wall and the top of the advection sedimentation tank, so that the upper end of the contact area is communicated with the air floatation area; the perforated flower wall is used for enabling the advection sedimentation zone to be communicated with the air floatation zone and used for settling floccules; the distance between the closed partition wall and the bottom of the advection sedimentation tank is 1m, the distance between the lower end of the perforated flower wall and the bottom of the advection sedimentation tank is 1m, and the height of the detachable partition wall is 1.8-2 m;
the gas dissolving device comprises a gas dissolving pump, a gas-water separator, a pipeline and a gas dissolving releaser, wherein the gas dissolving pump and the gas-water separator are sequentially arranged on the pipeline, the gas dissolving releaser is arranged at one end part of the pipeline and is used for being arranged in the contact area and releasing micro bubbles into the contact area, and the other end of the pipeline is used for being communicated with a water collecting well;
the slag scraping device comprises a slag flushing water pipe with a plurality of spray holes and a slag discharging groove, the slag discharging groove is arranged at one side, close to the sedimentation area, of the upper end of the air floatation area, the slag flushing water pipe is arranged at the upper end of the air floatation area, and water sprayed by the spray holes is used for sweeping the slag on the surface of the air floatation area into the slag discharging groove;
the water treatment method comprises the following steps:
(1) Detecting the water quality of the raw water to obtain indexes of turbidity, algae quantity and iron ion concentration of the raw water;
(2) Removing the detachable partition wall when the turbidity of raw water is higher than 50NTU, or the algae quantity is less than 100 ten thousand cells/L, or the iron ion concentration is less than 1.0mg/L, and enabling the gas dissolving device and the slag scraping device to be not operated, wherein the raw water is led into the flocculation tank and flocculated with a flocculating agent, and then enters the advection sedimentation area for sedimentation;
when the turbidity of raw water is lower than 5NTU, or the algae quantity is higher than 2000 ten thousand cells/L, or the iron ion concentration is higher than 2.0mg/L, installing the detachable partition wall, enabling the gas dissolving device and the slag scraping device to work, enabling the raw water to be introduced into the flocculation tank and flocculate with a flocculating agent, then entering the contact area, mixing with microbubbles released by a gas dissolving releaser to form scum, entering the gas floatation area, discharging the scum on the gas floatation area through the slag scraping device, and then entering the advection sedimentation area;
wherein,
the adding amount of the aluminum-containing or iron-containing salt flocculant is 8-50 mg/L;
or the adding amount of the polymer flocculant containing aluminum or iron is 3-40 mg/L, and the adding amount of the coagulant aid sodium hypochlorite is 4-40 mg/L.
2. The method for water treatment according to claim 1, wherein the dissolved air releasers comprise a plurality of dissolved air releasers, the outlet flow rate of each dissolved air releaser is 0.4-0.5 m/s, the opening degree of each dissolved air releaser is 5mm, and the action range of each dissolved air releaser is 30-100 cm.
3. The method of water treatment according to claim 1, wherein the microbubbles have a diameter of 20 to 40 μm.
4. A method of treating water according to any one of claims 1 to 3, wherein the direction from the air floating zone to the advection sedimentation zone is a preset direction, the axial extension direction of the scum flushing water pipe is perpendicular to the preset direction, and the axial lines of the plurality of spray holes on the scum flushing water pipe are all inclined downwards towards the advection sedimentation zone.
5. The method of water treatment according to claim 4, wherein the slag scraping device further comprises a motor and a lifting mechanism, wherein the lifting mechanism is arranged on the hard slag flushing water pipe, and the motor is connected with the lifting mechanism in a driving way and is used for enabling the slag flushing water pipe to move up and down or/and horizontally.
6. The method of claim 5, wherein the slag scraping device further comprises a hose and a hanging ring, the hose is arranged at one end of the scum sweeping water pipe and is communicated with the scum sweeping water pipe, a plurality of hanging rings are arranged at the upper end of one side wall of the air floatation area, and the hose is hung on the hanging rings.
7. A method of water treatment according to any one of claims 1 to 3, wherein the bottom of the advection sedimentation tank is provided with a plurality of sludge collection pits, each sludge collection pit is provided with a sludge discharge pipe, and the bottom of the advection sedimentation tank is provided with a sludge scraper for scraping sediment into the sludge collection pits and discharging the sediment through the sludge discharge pipes.
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| CN201923899U (en) * | 2011-01-20 | 2011-08-10 | 山东建筑大学 | Water purification system for inclined-tube floatation-sedimentation tank |
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