CN113135623A - Water treatment device and method for improving horizontal sedimentation tank - Google Patents
Water treatment device and method for improving horizontal sedimentation tank Download PDFInfo
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- CN113135623A CN113135623A CN202110598185.0A CN202110598185A CN113135623A CN 113135623 A CN113135623 A CN 113135623A CN 202110598185 A CN202110598185 A CN 202110598185A CN 113135623 A CN113135623 A CN 113135623A
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- sedimentation tank
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 218
- 238000004062 sedimentation Methods 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000011010 flushing procedure Methods 0.000 claims abstract description 33
- 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 32
- 239000008394 flocculating agent Substances 0.000 claims abstract description 24
- 238000005188 flotation Methods 0.000 claims abstract description 22
- 238000010408 sweeping Methods 0.000 claims abstract description 18
- 239000002893 slag Substances 0.000 claims abstract description 16
- 238000007599 discharging Methods 0.000 claims abstract description 11
- 230000003311 flocculating effect Effects 0.000 claims abstract description 4
- 238000005192 partition Methods 0.000 claims description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 30
- 229910052742 iron Inorganic materials 0.000 claims description 23
- 241000195493 Cryptophyta Species 0.000 claims description 17
- -1 iron ion Chemical class 0.000 claims description 16
- 239000010802 sludge Substances 0.000 claims description 16
- 238000001556 precipitation Methods 0.000 claims description 15
- 238000007667 floating Methods 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 11
- 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
- 239000013049 sediment 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
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 239000007921 spray Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 description 23
- 230000000694 effects Effects 0.000 description 10
- 239000007789 gas Substances 0.000 description 9
- 239000012535 impurity Substances 0.000 description 8
- 238000000926 separation method Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 230000036284 oxygen consumption Effects 0.000 description 5
- 239000004576 sand Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 239000000243 solution Substances 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
- 239000000463 material Substances 0.000 description 2
- WAEMQWOKJMHJLA-UHFFFAOYSA-N Manganese(2+) Chemical compound [Mn+2] WAEMQWOKJMHJLA-UHFFFAOYSA-N 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000001174 ascending effect Effects 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
- 238000005516 engineering process 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
- 238000010992 reflux Methods 0.000 description 1
- 239000007787 solid Substances 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
- 239000000725 suspension Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005406 washing Methods 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physical Water Treatments (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
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 horizontal flow sedimentation tank, a gas dissolving device and a slag scraping device. The flocculation tank is used for flocculating the flocculating agent and the raw water to form large flocs. The horizontal flow sedimentation tank is sequentially divided into a contact zone, an air flotation zone and a horizontal flow sedimentation zone, and the horizontal flow sedimentation zone is used for settling floccules. The dissolved air releaser of the dissolved air device is arranged at one end 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 communicating the water collecting well. The scum discharging groove of the scum scraping device is arranged on one side, close to the settling area, of the upper end of the air floatation area, the scum flushing water pipe is arranged at the upper end of the air floatation area, and water sprayed out of the plurality of spray holes is used for sweeping scum on the surface of the air floatation area into the scum discharging groove. The air flotation and sedimentation switching operation can be realized by modifying the horizontal flow 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 method for modifying a horizontal flow sedimentation tank.
Background
The invention patent with publication number CN 107986511A (patent number 201711496985.1) and name of air floatation and sedimentation solid-liquid separation device and treatment method for water treatment discloses a solid-liquid separation device and an operation method for a switchable operation air floatation or sedimentation process for water treatment. A contact area is arranged between a flocculation tank and a separation area, the separation area is connected with a sedimentation water outlet area through a perforated flower wall of the sedimentation water outlet area, the lower part of the separation area is provided with a mud collection area, the top water surface of the mud collection area is provided with a scum flushing water pipe, the flocculation tank is composed of four reaction sections and a transition section, the reaction sections are directly composed of a vertical shaft through wall intervals, and a small-hole mesh grid plate is arranged in the vertical shaft. The invention optimizes the structure of the air floatation and precipitation solid-liquid separation device and can achieve good treatment effect. However, the structure of the invention is more complex, and a new device is required, so that the manufacturing cost of the device is increased.
Disclosure of Invention
The application provides a water treatment facilities and method that advection sedimentation tank was reformed transform, reforms transform in the advection sedimentation tank and can realize air supporting and deposit and switch the operation, need not newly-built device.
In a first aspect, the application provides a water treatment device modified by a horizontal sedimentation tank, which comprises a flocculation tank, the horizontal sedimentation tank, a gas dissolving device and a slag scraping device.
The flocculation tank is used for flocculating the flocculating agent and the raw water to form large flocs. The horizontal flow sedimentation tank is arranged at the rear end of the flocculation tank, and is sequentially provided with a closed partition wall, a detachable partition wall and a perforated flower wall, so that the horizontal flow sedimentation tank is sequentially divided into a contact zone, an air flotation zone and a horizontal flow sedimentation zone; a distance is reserved between the lower end of the closed partition wall and the bottom of the horizontal flow sedimentation tank, and is used for communicating the lower end of the flocculation tank with the contact zone; the lower end of the detachable partition wall is connected with the bottom of the horizontal flow sedimentation tank, and a distance is reserved between the upper end of the detachable partition wall and the top of the horizontal flow sedimentation tank and used for communicating the upper end of the contact zone with the air flotation zone; the perforated tracery wall connects the advection settling zone with the air flotation zone for settling the floccules.
The dissolved air device comprises a dissolved air pump, an air-water separator, a pipeline and a dissolved air releaser, the dissolved air pump and the air-water separator are sequentially arranged on the pipeline, the dissolved air releaser is arranged at one end of the pipeline and used for being arranged in the contact zone and releasing micro bubbles into the contact zone, and the other end of the pipeline is used for communicating the water collecting well.
The scum scraping device comprises a scum flushing water pipe and a scum discharging groove, wherein the scum flushing water pipe is provided with a plurality of jet holes, the scum discharging groove is arranged on one side, close to the settling area, of the upper end of the air floatation area, the scum flushing water pipe is arranged on the upper end of the air floatation area, and water sprayed out 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 operates with the precipitation technology, will dismantle the partition wall and demolish, dissolve the gas device and scrape the sediment device and do not work, the flocculating agent forms the floc with the suspended solid in the raw water in the flocculation basin, and floc and water pass through the air supporting zone together, and the nature subsides after getting into the advection settling zone to handle the raw water.
If the device operates 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, the air dissolving pump is connected with a water collecting well through a pipeline, after the air dissolving pump sucks water, an impeller rotating at high speed in the air dissolving pump forms vacuum at a water inlet, air is sucked, liquid and gas are stirred into vortex by the impeller in a pump body, tiny bubbles are formed by continuous pressurization of the impeller, then air separated out from the water dissolving water is separated out through an air-water separator, the tiny bubbles are released to the contact area through the air-dissolving releaser, the released microbubbles have strong surface free energy, floc impurities in water can be adhered, and scum rising to the water surface is formed in an air floatation area. Then the scum is swept to the scum discharge tank by the water jetted by the scum sweeping water pipe, and the water enters the advection sedimentation area for sedimentation, so that the raw water is treated.
Optionally, the direction from the air flotation 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 injection holes on the scum flushing water pipe are inclined downwards to face the advection sedimentation area.
More scum can be swept to the scum discharge tank, the scum sweeping water pipe is arranged in the direction, the flow direction of water sprayed from the spray holes is consistent with the flow direction of raw water in treatment, and the consumption of water can be reduced.
Optionally, the scum scraping device further comprises a motor and a lifting mechanism, the lifting mechanism is arranged on the hard scum flushing and sweeping water pipe, and the motor is connected with the lifting mechanism in a driving mode and used for enabling the scum flushing and sweeping water pipe to move up and down or/and horizontally.
Can make the scum device can sweep the dross in the air supporting district more to subsequent settlement treatment's going on, thereby make the effect of water treatment better.
Optionally, the scum scraping device further comprises a hose and a hanging pipe ring, the hose is arranged at one end of the scum flushing water pipe and communicated with the scum flushing water pipe, a plurality of spaced hanging pipe rings are arranged at the upper end of one side wall of the air floatation area, and the hose is suspended on the plurality of hanging pipe rings.
Through the setting of hose, can make things convenient for the horizontal motion that the water pipe was swept to the dross, can with the hose cooperation, make scraping of scraping sediment device scrape the sediment effect better. And the hose can provide 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 horizontal flow sedimentation tank is 1m, the distance between the lower end of the perforated tracery wall and the bottom of the horizontal flow sedimentation tank is 1m, and the height of the detachable partition wall is 1.8-2 m.
Can make the discharged material of flocculation basin basically get into the contact zone to carry out comparatively abundant contact with the microbubble that dissolved gas releaser released, thereby make more abundant that the floc can be handled.
Optionally, the bottom of advection sedimentation tank all is provided with a plurality of album mud pits, and every album mud pit is provided with the mud pipe, and the bottom of advection sedimentation tank is provided with the mud scraper for scrape into album mud pit and discharge through the mud pipe with the precipitate. Impurities at the bottom of the horizontal flow sedimentation tank can be discharged.
In a second aspect, the present application provides a water treatment method, which is suitable for the water treatment device, and comprises the following steps:
(1) detecting the water quality of the raw water to obtain the turbidity, the algae quantity and the iron ion concentration index of the raw water;
(2) and when the turbidity of the raw water is higher than 50NTU, or the quantity of algae is less than 100 ten thousand cells/L, or the concentration of iron ions is less than 1.0mg/L, the detachable partition wall is dismantled, the air dissolving device and the slag scraping device do not work, the raw water is flocculated with the flocculating agent in the flocculation tank, and then the raw water enters the advection sedimentation area for sedimentation.
When the turbidity of raw water is lower than 5NTU, or the quantity of algae is more than 2000 ten thousand cells/L, or the concentration of iron ions is more than 2.0mg/L, a detachable partition wall is installed, an air dissolving device and a slag scraping device work, the raw water is flocculated with a flocculating agent in a flocculation tank, then enters a contact area, is mixed with micro bubbles released in an air dissolving releaser to form scum, enters an air floating area, the scum on the air floating area is discharged through a slag scraping device, and then enters an advection sedimentation area.
Wherein the addition amount of the aluminum-containing or iron-containing salt flocculating agent is 8-50 mg/L; or the adding amount of the aluminum-containing or iron-containing polymer flocculant is 3-40 mg/L; the adding amount of the coagulant aid sodium hypochlorite is 4-40 mg/L.
The operation 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 operation mode under the condition that the raw water is complicated and changeable, and the safety and high quality of water quality are guaranteed.
Optionally, to allow more suspension in the raw water to form floes.
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 zone can be floated for removal.
Optionally, the diameter of the microbubbles is 20-40 μm. The surface free energy of the micro bubbles is larger, and more destabilized floc impurities in water can be adhered to the micro bubbles so as to form scum.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a water treatment device modified from a horizontal flow sedimentation tank provided by an embodiment of the application.
Icon: 1-a water outlet pipe of the sand filter; 2-a dissolved air pump; 3-a gas dissolving pipe; 4-a pressure gauge; 5-a gas-water separator; 6-gas dissolving tube; 7-a flocculation tank; 8-closed partition walls; 9-a sludge discharge pipe; 10-dissolved air releaser; 11-a removable partition wall; 12-a contact zone; 13-an air flotation zone; 14-perforated tracery wall; 15-advection precipitation zone; 16-a mud scraper; 17-a water collecting tank; 18-a slag discharge groove; 19-a hose; 20-hanging a pipe ring; 21-a lifting mechanism; 22-the scum is flushed through the water pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in 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 basin 7, advection sedimentation tank, dissolved gas device and scum device.
Wherein the flocculation tank 7 is used for flocculating the flocculating agent and the raw water to form large flocs. The horizontal sedimentation tank is arranged at the rear end of the flocculation tank 7, and is sequentially provided with a closed partition wall 8, a detachable partition wall 11 and a perforated flower wall 14, so that the horizontal sedimentation tank is sequentially divided into a contact zone 12, an air flotation zone 13 and a horizontal sedimentation zone 15; the lower end of the closed partition wall 8 is separated from the bottom of the horizontal flow sedimentation tank, and is used for communicating the lower end of the flocculation tank 7 with the contact zone 12; the lower end of the detachable partition wall 11 is connected with the bottom of the horizontal flow sedimentation tank, and a distance is reserved between the upper end of the detachable partition wall 11 and the top of the horizontal flow sedimentation tank, so that the upper end of the contact zone 12 is communicated with the air flotation zone 13; perforated tracery walls 14 connect the advection settling zone 15 with the air flotation zone 13 for settling the floe.
If the device operates by a precipitation process, the detachable partition wall 11 is detached, the air dissolving device and the slag scraping device do not work, the flocculating agent and suspended matters in the raw water form flocs in the flocculation tank 7, and the flocs and the water pass through the air flotation zone 13 and naturally settle after entering the advection precipitation zone 15, so that the raw water is treated.
If the device operates by an air floatation process, the detachable partition wall 11 is installed, the air dissolving device and the slag scraping device work, a 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 by the air dissolving device, unstable floc impurities in the water are adhered, and scum ascending to the water surface is formed in the air floatation area 13. Then the scum is swept away by a scum scraping device, and the water enters an advection sedimentation area 15 for sedimentation, thereby treating the raw water.
In this application, the dissolved air device includes dissolved air pump 2, deareator 5, pipeline and dissolved air releaser 10, and dissolved air pump 2 and deareator 5 set gradually in the pipeline, and dissolved air releaser 10 sets up in a tip of pipeline, and is used for setting up in contact zone 12 and releases the microbubble to contact zone 12 in, and the other end of pipeline is used for communicateing the sump pit.
Because the dissolved air pump 2 is connected with the water collecting well through a pipeline, after the dissolved air pump 2 sucks water, the impeller rotating at high speed in the dissolved air pump 2 forms vacuum at a water inlet to suck gas, the liquid and the gas are stirred into vortex by the impeller in the pump body and are continuously pressurized by the impeller to form micro bubbles, then the air separated out from the dissolved air water is separated out through the air-water separator 5, then the micro bubbles are released to the contact area 12 through the dissolved air releaser 10, the released micro bubbles have strong surface free energy and can be adhered with floc impurities destabilized in the water, and scum rising to the water surface is formed in the air floating area 13.
Optionally, the diameter of the microbubbles is 20-40 μm. Illustratively, the diameter of the microbubbles is 20 μm, 25 μm, 30 μm, 35 μm, or 40 μm.
Optionally, the sand filter rear water collecting well is communicated with the dissolved air pump 2 through a sand filter water outlet pipe 1, and the sand filter water is adopted for backflow to avoid blocking the dissolved air releaser 10. The dissolved air pump 2 is communicated with the gas-water separator 5 through a dissolved air pipe 3, the gas-water separator 5 is communicated with the dissolved air releaser 10 through a dissolved air pipe 6, a pressure gauge 4 is installed on the gas-water separator 5, and the pressure is maintained between 0.3 MPa and 0.35MPa during operation.
The flow velocity of a pipeline in front of the dissolved air releaser 10 is less than 1m/s, the flow velocity of an outlet of the dissolved air releaser 10 is 0.4-0.5 m/s, the opening of a narrow gap during flushing is 5mm, the action range of each dissolved air releaser 10 is 30-100 cm, and the arrangement number of the dissolved air releasers 10 is 24-32 per ten thousand m3And (5) designing the scale. More flocs in contact zone 12 may be floated for removal.
In this application, the scum scraping device includes scum flushing water pipe 22 and scum groove 18 that have a plurality of jet orifices, and scum groove 18 sets up in the one side that is close to settling zone 15 of the upper end in air supporting district 13, and scum flushing water pipe 22 sets up in the upper end in air supporting district 13, and the water that a plurality of jet orifices jetted out is used for sweeping the scum on air supporting district 13 surface to in scum groove 18.
The scum flushing water pipe 22 controls whether water is sprayed from the spray holes through a valve, the scum in the air floating area 13 is swept to the scum discharging groove 18 through the water sprayed from the scum flushing water pipe 22, and the water enters the advection sedimentation area 15 for sedimentation, so that the raw water is treated.
Optionally, the direction from the air flotation zone 13 to the advection precipitation zone 15 is a preset direction, the axial extension direction of the scum flushing water pipe 22 is perpendicular to the preset direction, and the axial lines of the plurality of spray holes on the scum flushing water pipe 22 are all inclined downwards towards the advection precipitation zone 15.
More scum can be swept to the scum discharge tank 18, the scum sweeping water pipe 22 is arranged in the direction, and the flow direction of water sprayed from the spray holes is consistent with the flow direction of raw water in the treatment process, so that the water consumption can be reduced.
Optionally, the scum scraping device further comprises a motor and a lifting mechanism 21, wherein the lifting mechanism 21 is arranged on the hard scum flushing water pipe 22, and the motor is connected with the lifting mechanism 21 in a driving manner and used for enabling the scum flushing water pipe 22 to move up and down or/and horizontally.
The scum scraping device can sweep more scum in the air flotation zone 13 so as to facilitate the subsequent sedimentation treatment, thereby ensuring better water treatment effect.
Optionally, the scum scraping device further comprises a hose 19 and a hanging pipe ring 20, the hose 19 is arranged at one end of the scum flushing water pipe 22 and is communicated with the scum flushing water pipe 22, a plurality of spaced hanging pipe rings 20 are arranged at the upper end of one side wall of the air floating area 13, and the hose 19 is suspended on the plurality of hanging pipe rings 20.
Through the arrangement of the hose 19, the horizontal movement of the scum flushing water pipe 22 can be facilitated, and the scum flushing water pipe can be matched with the hose 19, so that the scum scraping effect of the scum scraping device is better. And the hose 19 may provide a source of water to the dross sweeping water pipe 22 for subsequent sweeping.
The scum discharge groove 18 is installed on the perforated tracery wall 14, the scum flushing water pipe 22 is made of stainless steel pipes and stretches across the air floating area 13, the lifting is realized through the screw lifting mechanisms 21 at two ends so as to be kept 8-10 mm above the water surface, water flow can be sprayed out through spraying holes with the diameter of 2.0mm at intervals of 10mm at 30 degrees below the front side of the pipe for washing, a hose 19 which is hung through a pipe hanging ring 20 is adopted at the part of the pipeline connected with the scum flushing water pipe 22 at the edge of the air floating area 13, so that the scum flushing water pipe 22 is driven by a motor to move back and forth, and all scum can be washed into the scum discharge groove 18. Because the water treatment capacity of the water plant may be different at the water supply peak, the floating slag flushing water pipe 22 can be adjusted in height so as to meet the requirement that effective flushing can be realized at different water levels in the tank.
Optionally, the distance between the closed partition wall 8 and the bottom of the horizontal sedimentation tank is 1m, the distance between the lower end of the perforated tracery wall 14 and the bottom of the horizontal sedimentation tank is 1m, and the height of the detachable partition wall 11 is 1.8-2 m.
The material discharged from the flocculation tank 7 can be substantially introduced into the contact zone 12 and can be in relatively sufficient contact with the micro-bubbles released from the dissolved air releaser 10, so that the flocs can be more sufficiently processed.
The contact zone 12 needs to be filled with water from the front end flocculation tank 1 to the bottom of the closed partition wall 8 of the advection sedimentation zone 15 at the height of 1m, and then a detachable partition wall 11 with the height of 1.8-2.0 m is built from the closed partition wall 8 along the water flow direction at the position of 2m to form the contact zone 12, the detachable partition wall 11 is used when the air floatation process is operated, and the detachable partition wall can be detached when the sedimentation process is operated.
Optionally, the bottom of the horizontal sedimentation tank is provided with a plurality of sludge collecting pits (one or more are provided at the bottom of the contact region 12 and the bottom of the horizontal sedimentation region 15), each sludge collecting pit is provided with a sludge discharge pipe 9, and the bottom of the horizontal sedimentation tank is provided with a sludge scraper 16 for scraping the precipitate into the sludge collecting pits and discharging the precipitate through the sludge discharge pipe 9. Impurities at the bottom of the horizontal flow sedimentation tank can be discharged.
The bottom of the front end of the advection sedimentation area 15 is built at a position 15-20 m backwards to form an air flotation area 13 (the work of a 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 area 15 is a mud scraper of other types, the modification needs to be carried out to meet the mud scraping operation of the air flotation area 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 the turbidity, the algae quantity and the iron ion concentration index of the raw water; alternatively, the index may be turbidity, algae, pH, ammonia nitrogen, oxygen consumption, iron ion concentration, manganese ion concentration, or the like.
(2) And when the turbidity of the raw water is higher than 50NTU, or the quantity of algae is less than 100 ten thousand cells/L, or the concentration of iron ions is less than 1.0mg/L, the detachable partition wall 11 is dismantled, the air dissolving device and the slag scraping device do not work, the raw water is flocculated with the 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 a flocculating agent enters a flocculation tank 7, the flocculating agent and suspended matters in the water form flocs through collision, then the flocs enter an advection sedimentation area 15 and naturally settle in the advection sedimentation area 15, and the flocs are scraped into a sludge collection pit by a sludge scraper 16 and are discharged through a sludge discharge pipe 9. The clear water after precipitation is collected by the water collection tank 17 and flows into the subsequent process.
When the turbidity of raw water is lower than 5NTU, or the quantity of algae is more than 2000 ten thousand cells/L, or the concentration of iron ions is more than 2.0mg/L, a detachable partition wall 11 is installed, an air dissolving device and a slag scraping device work, the 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 an air dissolving releaser to form scum, enters an air floating area 13, the scum on the air floating area 13 is discharged through the slag scraping device, and then enters an advection sedimentation area 15.
When the air floatation process is operated, raw water added with a flocculating agent enters a flocculation tank 7, the flocculating agent and suspended matters in the water form flocs through collision, the water enters a contact zone 12 from the bottom through a closed partition wall 8 connected with the flocculation tank 7 and an advection sedimentation zone 15, and the water is mixed with dissolved air water released by a dissolved air releaser 10 and flows into the contact zone 12. In the contact area 12, the released micro-bubbles have strong surface free energy, and can adhere to destabilized floc impurities in water, scum rising to the water surface is formed in the air floating area 12, and the scum is swept to the scum discharge tank 18 by the water flow sprayed through the scum sweeping water pipe 22 and is discharged. The accumulated mud at the bottom of the pool is scraped into a mud collection pit by a mud scraper 16 and is discharged through a mud discharge pipe 9, and the water after the impurities are removed is collected by a water collection tank 17 and flows into the subsequent process.
It should be noted that: when three conditions of turbidity, algae and iron are crossed, the turbidity is taken as a priority; other conditions can be selected according to actual comparison, and the precipitation process can be preferentially selected when the air floatation process cost is slightly higher and the effect difference is not large.
In the application, the adding amount of the aluminum-containing or iron-containing salt flocculating agent is 8-50 mg/L. Or the adding amount of the aluminum-containing or iron-containing polymer flocculant is 3-40 mg/L; the adding amount of the coagulant aid sodium hypochlorite is 4-40 mg/L. So that more suspended matter in the raw water forms flocs.
The application provides a water treatment facilities and method that advection sedimentation tank reforms transform's beneficial effect includes: the water treatment device obtained by transformation on the basis of the horizontal sedimentation tank can realize the switching operation of the sedimentation process and the air flotation process. In addition, the operation mode is adjusted according to the values of indexes such as turbidity, algae quantity and iron ion concentration of raw water, so that a better treatment effect can be achieved, and stable and efficient operation is realized.
The following provides a specific example for explaining the operation method of the improved water treatment device of the horizontal flow sedimentation tank.
EXAMPLE 1 treatment of reservoir raw Water (operation air flotation Process)
Detecting the water quality of raw water, and obtaining a detection result according to the water quality index of the raw water as follows: 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 4.6 mg/L.
According to the indexes, the operation mode is determined to be an air flotation process, the flocculating agent is polyaluminium chloride, the adding amount of the flocculating agent is determined to be 6mg/L according to the similar historical raw water quality, and meanwhile, the sodium hypochlorite coagulant aid is added to the flocculating agent to be 5mg/L, the reflux ratio is 6%, and the dissolved air pressure is 0.32 MPa.
After the air floatation process, the indexes of the obtained water are as follows: the effluent turbidity of the horizontal 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 1.9 mg/L. The treatment effect of raw water is good.
EXAMPLE 2 treatment of river raw Water (running precipitation Process)
Detecting the water quality of raw water, and obtaining a detection result according to the water quality index of the raw water as follows: the water turbidity of raw water is 187NTU, the algae amount is 1300 ten thousand cells/L, the iron ion concentration is 0.5mg/L, and the oxygen consumption is 5.7 mg/L.
According to the indexes, the operation mode is determined to be a precipitation process, the flocculating agent is polyaluminium chloride, the adding amount of the flocculating agent is determined to be 19mg/L according to the similar historical raw water quality, and meanwhile, the sodium hypochlorite coagulant aid is added to 6 mg/L.
After the precipitation process, the indexes of the obtained water are as follows: the effluent turbidity of the horizontal 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 2.2 mg/L. The treatment effect of raw water is good.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. The utility model provides a water treatment facilities that advection sedimentation tank reformed transform which characterized in that includes:
a flocculation tank for flocculating the flocculant and the raw water to form large flocs;
the horizontal sedimentation tank is arranged at the rear end of the flocculation tank, and is sequentially provided with a closed partition wall, a detachable partition wall and a perforated flower wall, so that the horizontal sedimentation tank is sequentially divided into a contact zone, an air flotation zone and a horizontal sedimentation zone; a distance is reserved between the lower end of the closed partition wall and the bottom of the horizontal sedimentation tank, and the distance is used for communicating the lower end of the flocculation tank with the contact zone; the lower end of the detachable partition wall is connected with the bottom of the horizontal flow sedimentation tank, and a distance is reserved between the upper end of the detachable partition wall and the top of the horizontal flow sedimentation tank, so that the upper end of the contact zone is communicated with the air flotation zone; the perforated tracery wall communicates the advection settling zone with the air flotation zone for settling floes;
the dissolved air device comprises a dissolved air pump, a gas-water separator, a pipeline and a dissolved air releaser, the dissolved air pump and the gas-water separator are sequentially arranged on the pipeline, the dissolved air releaser is arranged at one end part of the pipeline and 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 communicating with the water collecting well;
the scum scraping device comprises a scum flushing water pipe and a scum discharging groove which are provided with a plurality of jet holes, wherein the scum discharging groove is formed in the upper end of the air floatation area and is close to one side of the sedimentation area, the scum flushing water pipe is formed in the upper end of the air floatation area, and water sprayed out by the jet holes is used for sweeping the scum on the surface of the air floatation area to the scum discharging groove.
2. The water treatment device according to claim 1, wherein the direction from the air flotation zone to the advection precipitation zone is a preset direction, the axial extension direction of the scum sweeping water pipe is perpendicular to the preset direction, and the axial lines of the plurality of injection holes on the scum sweeping water pipe are inclined downwards towards the advection precipitation zone.
3. The water treatment device according to claim 2, wherein the scum scraping device further comprises a motor and a lifting mechanism, the lifting mechanism is arranged on the hard scum sweeping water pipe, and the motor is in driving connection with the lifting mechanism and is used for enabling the scum sweeping water pipe to move up and down or/and horizontally.
4. The water treatment device according to claim 3, wherein the scum scraping device further comprises a hose and a pipe 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 spaced pipe hanging rings are arranged at the upper end of one side wall of the air floatation region, and the hose is suspended on the plurality of pipe hanging rings.
5. The water treatment apparatus as claimed in any one of claims 1 to 4, wherein the closed partition wall is spaced from the bottom of the horizontal flow sedimentation tank by a distance of 1m, the perforated tracery wall is spaced from the bottom of the horizontal flow sedimentation tank by a distance of 1m, and the detachable partition wall has a height of 1.8 to 2 m.
6. The water treatment device as claimed in any one of claims 1 to 4, wherein the bottom of the horizontal flow sedimentation tank is provided with a plurality of sludge collecting pits, each sludge collecting pit is provided with a sludge discharge pipe, and the bottom of the horizontal flow sedimentation tank is provided with a sludge scraper for scraping sediments into the sludge collecting pits and discharging the sediments through the sludge discharge pipes.
7. A water treatment method applied to the water treatment device according to any one of claims 1 to 6, characterized by comprising the following steps:
(1) detecting the water quality of the raw water to obtain the turbidity, the algae quantity and the iron ion concentration index of the raw water;
(2) when the turbidity of raw water is higher than 50NTU, or the number of algae is less than 100 ten thousand cells/L, or the concentration of iron ions is less than 1.0mg/L, the detachable partition wall is dismantled, the air dissolving device and the slag scraping device do not work, the raw water is introduced into the flocculation tank and flocculated with a flocculating agent, and then the raw water enters the advection sedimentation zone for sedimentation;
when the turbidity of raw water is lower than 5NTU, or the quantity of algae is more than 2000 ten thousand cells/L, or the concentration of iron ions is more than 2.0mg/L, the detachable partition wall is installed, the air dissolving device and the slag scraping device work, the raw water is introduced into the flocculation tank and flocculated with a flocculating agent, then enters the contact area, is mixed with micro bubbles released in the air dissolving releaser to form scum, enters the air floating area, and the scum on the air floating area is discharged through the slag scraping device and then enters the advection sedimentation area;
wherein the addition amount of the aluminum-containing or iron-containing salt flocculant is 8-50 mg/L;
or the adding amount of the aluminum-containing or iron-containing polymer flocculant is 3-40 mg/L; the adding amount of the coagulant aid sodium hypochlorite is 4-40 mg/L.
8. The water treatment method according to claim 7, wherein 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 openness of each dissolved air releaser is 5mm, and the action range of each dissolved air releaser is 30-100 cm.
9. The water treatment method according to claim 7 or 8, wherein the diameter of the microbubbles is 20 to 40 μm.
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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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