CN109824186B - Process for lifting mineral sand circulation high-speed sedimentation tank through negative pressure - Google Patents
Process for lifting mineral sand circulation high-speed sedimentation tank through negative pressure Download PDFInfo
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- CN109824186B CN109824186B CN201910241555.8A CN201910241555A CN109824186B CN 109824186 B CN109824186 B CN 109824186B CN 201910241555 A CN201910241555 A CN 201910241555A CN 109824186 B CN109824186 B CN 109824186B
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- 239000004576 sand Substances 0.000 title claims abstract description 153
- 238000004062 sedimentation Methods 0.000 title claims abstract description 97
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 60
- 239000011707 mineral Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000008569 process Effects 0.000 title claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 129
- 239000010865 sewage Substances 0.000 claims abstract description 48
- 238000009826 distribution Methods 0.000 claims abstract description 37
- 238000005189 flocculation Methods 0.000 claims abstract description 32
- 230000016615 flocculation Effects 0.000 claims abstract description 32
- 238000005345 coagulation Methods 0.000 claims abstract description 31
- 230000015271 coagulation Effects 0.000 claims abstract description 30
- 238000005273 aeration Methods 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 147
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 14
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 239000000701 coagulant Substances 0.000 claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 239000008394 flocculating agent Substances 0.000 claims description 8
- 239000013049 sediment Substances 0.000 claims description 7
- 238000005276 aerator Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 5
- 239000000149 chemical water pollutant Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- 239000003814 drug Substances 0.000 claims description 4
- 239000010842 industrial wastewater Substances 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 239000011572 manganese Substances 0.000 claims description 4
- 238000009827 uniform distribution Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 claims description 3
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- 238000006243 chemical reaction Methods 0.000 abstract description 9
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- 239000010802 sludge Substances 0.000 description 15
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
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- 238000004064 recycling Methods 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
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- 229910052742 iron Inorganic materials 0.000 description 2
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- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 229960004887 ferric hydroxide Drugs 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- 239000010452 phosphate Substances 0.000 description 1
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Abstract
The invention discloses a process for lifting a mineral sand circulation high-speed sedimentation tank by negative pressure, and belongs to the technical field of water treatment. The process is characterized in that a high-speed sedimentation tank is utilized for sewage treatment, mineral sand is utilized for realizing high-speed sedimentation of impurities in sewage in the treatment process, and then the precipitated mud sand is separated in a negative pressure lifting mode through compressed air, so that the mineral sand is recycled in the sewage treatment process; the high-speed sedimentation tank comprises a coagulation area, a flocculation sand adding area, a uniform water distribution area, a conical bucket inclined tube sedimentation area and an aeration denitrification water outlet area. According to the invention, one or more mineral sand is/are selected to be loaded for high-speed sedimentation through mixing reaction, the mud and sand are separated in a negative pressure lifting mode through compressed air, the mineral sand is recycled, and the section rising flow rate of sewage sedimentation is improved.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a process for lifting a mineral sand circulation high-speed sedimentation tank by negative pressure.
Background
The domestic common sedimentation tank mainly comprises: a radial flow sedimentation tank, a horizontal flow sedimentation tank, an inclined tube sedimentation tank, a high-efficiency sedimentation tank, a magnetic coagulation sedimentation tank, a sand adding sedimentation tank and the like. Wherein the ascending flow rate of the pollutant sedimentation cross section of the radial flow sedimentation tank and the horizontal flow sedimentation tank adopting a physical method is between 0.8 and 3.5m/h, the ascending flow rate of the cross section of the inclined tube sedimentation tank and the high-efficiency sedimentation tank adopting a physicochemical method is between 8.3 and 14m/h, and the ascending flow rate of the cross section of the magnetically-added coagulation sedimentation tank is between 13 and 25 m/h.
Considering that the current national environmental protection department proposes that the IV water quality standard of the surface level needs to be achieved before 2020, the technical tide of environmental protection improvement will be raised in the national range in the next few years. Particularly in the removal of total nitrogen, total phosphorus, indicators is a significant challenge. Wherein, the nitrogen is removed without separating biochemical process and the phosphorus is removed without separating sedimentation process.
Meanwhile, in the projects of river channel treatment and sewage interception, urban sewage interception and dry pipe interception, sewage treatment plant upgrading and reconstruction, landfill leachate treatment and the like, the high-speed sedimentation tank process is a preferred option, and the advancement of the process directly affects the working efficiency and the economic cost of the project.
Disclosure of Invention
The invention aims to provide a process for lifting a mineral sand circulating high-speed sedimentation tank by negative pressure, which can solve the problem of low sedimentation efficiency of the sedimentation tank.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a technology for lifting a mineral sand circulation high-speed sedimentation tank by negative pressure comprises the steps of carrying out sewage treatment by utilizing the high-speed sedimentation tank, realizing high-speed sedimentation of impurities in sewage by utilizing the mineral sand in the treatment process, separating the sedimented mud sand by utilizing compressed air in a negative pressure lifting mode, and recycling the mineral sand in the sewage treatment process; the high-speed sedimentation tank comprises a coagulation area, a flocculation sand adding area, a uniform water distribution area, a conical bucket inclined tube sedimentation area and an aeration denitrification water outlet area, wherein:
and (3) a coagulation area: mixing coagulant with suspended particles in sewage in a coagulation zone under stirring and forming small flocs; the coagulation area comprises a cylindrical or rectangular Chi Ti, a water inlet pipeline is arranged on the tank body I, and a coagulant dosing pipe is arranged at a water inlet of the water inlet pipeline;
flocculation sand adding area: small floccules formed in the coagulation area enter the flocculation sand adding area and then are mixed with the added flocculant and mineral sand, and the small floccules form large floccules by taking the added mineral sand as a core; the flocculation sand adding area comprises a rectangular tank body II, a vertical guide cylinder and a sand washer, wherein the vertical guide cylinder is arranged in the rectangular tank body II, and a slow stirrer is arranged in the vertical guide cylinder; the sand washer is arranged above the rectangular tank body II and is used for cleaning mineral sand, and a flocculating agent dosing pipe and a mineral sand dosing port are also arranged at the upper part of the rectangular tank body II and are respectively used for adding flocculating agent and mineral sand into a flocculating sand dosing area;
uniform water distribution area: the mixed materials in the flocculation sand adding area enter a uniform water distribution area for uniform distribution; the uniform water distribution area is arranged in the rectangular tank body III and is a planar net structure formed by mutually communicated and distributed multiple water distribution pipes;
conical bucket inclined tube sedimentation zone: the device comprises an inclined tube, a sedimentation zone and a negative pressure lifting device, wherein the sedimentation zone is formed by uniformly arranging a plurality of conical hoppers in the horizontal direction, the sedimentation zone is positioned below the uniform water distribution zone, the inclined tube is positioned above the uniform water distribution zone, and a water collecting tank is arranged above the inclined tube; the negative pressure lifting device comprises a plurality of vertical blow-down pipes, and the lower end of each blow-down pipe extends into a conical hopper; in the process that the mixed material in the uniform water distribution area flows upwards from the bottom of the inclined plate to the water collecting tank, particles and flocs in the mixed material are deposited on the surface of the inclined plate and slide downwards under the action of gravity and are deposited in the conical hopper;
aeration denitrification water outlet area: a microporous tube type aerator is arranged between the upper end of the inclined tube and the water collecting tank, and air is blown in by a blower to realize dosing or aeration in the water body, so that nitrogen in the water body is promoted to be converted, and partial nitrogen is removed; the water after denitrification treatment is collected by a water collecting tank and discharged.
In the coagulation zone, a pipeline mixer is arranged at the water inlet of a water inlet pipeline, an electromagnetic flowmeter is arranged on the water inlet pipeline, and a rapid stirrer is further arranged on the tank body I.
In the flocculation sand adding area, the slow stirrer is controlled to stir at the rotating speed of 40-90 r/min in a closed-loop control mode according to the water quantity and water quality change, sewage is lifted in the vertical guide cylinder, the sewage circulation flow inside and outside the guide cylinder is more fully mixed, and the residence time of the sewage in the flocculation sand adding area is prolonged.
The inlet of the sand washer is provided with a hydrocyclone, and the sand outlet of the sand washer is provided with a sodium hypochlorite dosing pipe; mineral sand separated by the hydrocyclone separator enters a sand washer, the mineral sand cleaned by the sand washer is lifted to a sand washer outlet by a screw conveyor in the sand washer, sodium hypochlorite medicament at the sand washer outlet is fully mixed with the mineral sand in a spraying mode, the mineral sand is oxidized and then is put into a flocculation sand adding area, and sand washing wastewater can be discharged to a coagulation area.
The rectangular tank body I and the rectangular tank body II of the high-speed sedimentation tank are communicated through a bottom channel I, the rectangular tank body II and the rectangular tank body III are separated by a baffle, and a channel II is formed in the middle of the baffle; one end of the bottom channel I is arranged at the bottom of the rectangular tank body I, and the other end of the bottom channel I is arranged at the bottom of the rectangular tank body II and is positioned right below the guide cylinder; the mixed material in the flocculation sand adding area enters the uniform water distribution area through the channel II, flows upwards to the channel II, and then flows downwards to the uniform water distribution area.
The negative pressure lifting device comprises a plurality of vertical blow-down pipes, silt pipes and compressed air pipes, wherein: the upper end of each vertical blow-down pipe is communicated with the silt pipe, and the middle upper part of the side wall of each vertical blow-down pipe is connected to the compressed air pipe through a branch pipe; the mud sand pipe is connected with the feed inlet of the hydrocyclone, the top end of the hydrocyclone is provided with a mud pipe for discharging separated mud, the feed inlet is arranged on the upper part of the side wall of the hydrocyclone, the sand outlet is arranged at the bottom of the hydrocyclone, and the end part of the sand outlet extends into the sand washer.
In the conical bucket inclined tube sedimentation zone, a compressed air tube is connected with an air compressor; the height of the inclined tube is 1.2m, the included angle between the inclined tube and the horizontal direction is 60 degrees, and the design of the inclined plate height and the inclined angle forms a continuous self-scraping process, so that flocs cannot accumulate on the inclined tube.
The mineral sand used in the invention is formed by mixing quartz sand, manganese ore sand and iron powder according to the weight ratio of 5:2:1.
The high-speed sedimentation tank process is used for sedimentation treatment stages in the water treatment fields of urban domestic sewage treatment, industrial wastewater treatment, river sewage treatment and sediment treatment, water works or landfill leachate and the like.
When the high-speed sedimentation tank technology is adopted for sewage treatment, the water rising flow velocity in the inclined tube sedimentation zone can reach 30-50 m/h according to the water quality change of the inlet water.
The high-speed sedimentation tank process can be used for sedimentation treatment stages in the water treatment fields of urban domestic sewage treatment, industrial wastewater treatment, river sewage treatment and sediment treatment, water works or landfill leachate and the like.
The invention has the following advantages and beneficial effects:
1. according to the high-speed sedimentation tank process, mineral sand is lifted by compressed air in a negative pressure lifting mode, sediment mud, sand and other substances in a sedimentation hopper of a sedimentation area of a conical hopper are lifted, the mud and sand are separated by utilizing the kinetic energy of the compressed air, the mineral sand is recycled, sand particles are added with flocculating agent (PAM) and are uniformly distributed and then are put into a flocculation area or a coagulation area, sewage after coagulation reaction is trapped and loaded with load bearing of the mud, so that the mud and the mineral sand can be precipitated at a high speed in the sedimentation area of the conical hopper and a settling area of an inclined tube, and then the purpose of recycling the mineral sand is achieved by lifting and separating by compressed air in a negative pressure mode. An aeration denitrification device is arranged on the effluent to remove partial nitrogen.
2. The high-speed sedimentation tank process mainly aims at removing suspended substances SS and total phosphorus TP in sewage, and has a certain positive effect on removing indexes such as chemical oxygen demand COD, total nitrogen TN, ammonia nitrogen NH3-N and the like. Through PLC automated control and real-time detection of on-line instrument, the system can be according to inflow water, pollutant automatic adjustment operation data and dosage, has reached the unmanned on duty of overall process in operation management.
3. The process solves the problems of low sludge sedimentation speed and low treatment efficiency, greatly improves the section rising flow rate of sewage by adopting the high-speed sedimentation tank process, and can improve the water rising flow rate of a sewage inclined tube sedimentation zone to 30-50 m/h.
4. The invention reduces the land occupation area, and reduces the operation and maintenance cost, engineering investment, management cost and the like.
Drawings
FIG. 1 is a schematic diagram of a process for lifting a mineral sand circulation high-speed sedimentation tank by negative pressure.
FIG. 2 is a schematic diagram of the overall structure of a high-speed sedimentation tank used in the present invention.
FIG. 3 is a schematic diagram of a sand washer according to the present invention.
FIG. 4 is a plan view of a uniform distribution area of the high-speed sedimentation tank of the present invention.
FIG. 5 is a plan view of the aeration denitrification effluent area of the high-speed sedimentation tank of the present invention.
Fig. 6 is a layout of the self-control instrument involved in the high-speed sedimentation tank of the present invention.
In the figure: 100-coagulation area; 101-a pipeline mixer; 102-an electromagnetic flowmeter; 103-a rapid mixer; 104-channel I; 200-flocculating and sand adding area; 201-a guide cylinder; 202-a slow stirrer; 203-channel II; 300-uniformly distributing water area; 400-aeration denitrification water outlet area; 401-microporous aerator; 402-an air tube; 5-sand washer; 6-a hydrocyclone separator; 7-sodium hypochlorite dosing tube; 8-a sludge pipe; 9-a conical hopper; 10-vertical riser; 11-a silt pipe; 12-compressed air pipes; 13-air compressor (air compressor); 14-a water collection tank; 15-inclined tube; 16-a water outlet area; 17-a liquid level switch; 18-a sludge interface instrument; 19-SS on-line analyzer; 20-pressure regulating valve.
Detailed Description
The present invention is described in detail below with reference to the drawings so that advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
Referring to fig. 1, the invention relates to a process for lifting mineral sand by negative pressure to circulate a high-speed sedimentation tank, which solves the problems of low sludge sedimentation speed, low treatment efficiency, high operation and maintenance cost, large occupied area and high investment cost.
According to the invention, the mineral sand for the high-speed sedimentation tank process is used for lifting substances such as sediment mud and sand in a sedimentation hopper of a conical hopper sedimentation zone in a negative pressure lifting circulation mode through compressed air, separating mud and sand by utilizing the kinetic energy of the compressed air, adding flocculating agent (PAM) into sand particles, uniformly distributing the sand particles, then putting the sand particles into a flocculation zone or a coagulation zone, capturing sewage after coagulation reaction, loading the load of the sludge, and enabling the sludge and the mineral sand to be capable of being precipitated at a high speed in the conical hopper sedimentation zone and a chute clarification zone, and separating the sludge and the mineral sand in a negative pressure lifting mode through the compressed air, so that the purpose of recycling the mineral sand is achieved. An aeration denitrification device is arranged on the effluent to remove partial nitrogen.
The high-speed sedimentation tank process adopts a sedimentation tank with a specific structure, and the structure is shown in figures 2-6. The sedimentation tank comprises a coagulation area 100, a flocculation sand adding area 200, a uniform water distribution area 300, a conical bucket inclined tube sedimentation area and an aeration denitrification water outlet area 400.
1. Coagulation zone
Structural layout form: the cylindrical or rectangular tank body I1 seat, the water inlet is provided with a pipeline mixer 101, an electromagnetic flowmeter 102 is arranged on a water inlet pipeline, a rapid stirrer 103 is arranged on the upper portion of the tank body, the water inlet can be expanded and additionally provided with an activated carbon adding device 1 sleeve, and the water inlet is also provided with a coagulant adding pipe.
The main process equipment comprises: 1 pipeline mixer, 1 electromagnetic flowmeter, 1 rapid mixer (frequency conversion closed-loop control), 1 coagulant dosing pipe, and 1 activated carbon dosing device.
The process control principle:
the sewage to be treated enters a coagulation area from a water inlet, coagulant (PAC in fig. 2) is added into the water inlet through a coagulant adding pipe, the sewage and the coagulant are mixed through a pipeline mixer and then enter the coagulation area, the sewage and suspended matters in the sewage are quickly mixed under the action of a rapid stirrer in a closed loop control mode of 90-120 r/min according to water quantity and water quality change through variable frequency speed regulation, particles are destabilized through neutralizing negative charges on the surfaces of the particles, small flocs are formed, and then the small flocs enter a guide cylinder 201 of a flocculation sand adding area through a bottom channel I104 of a tank body I. And meanwhile, phosphorus in raw water reacts with a coagulant to form phosphate so as to achieve the aim of chemical phosphorus removal.
2. Flocculation sand adding area
Structural layout form: rectangular cell body II 1 seat is installed inside, sets up vertical draft tube 201 in the vertical draft tube, sets up slow mixer 202 in the vertical draft tube, and cell body II upper portion sets up sand washer 5, and sand washer entry sets up hydrocyclone 6, and the export sets up sodium hypochlorite charge pipe 7, and cell body II upper portion still is equipped with the flocculating agent charge pipe.
The main process equipment comprises: 1 stage of slow stirrer (frequency conversion closed-loop control), 1 stage of hydrocyclone, 1 stage of sand washer, 1 stage of liquid level switch, 1 circuit of flocculant (PAM) dosing pipe, 1 circuit of sodium hypochlorite dosing pipe and 1 circuit of sludge pipe.
The process control principle:
circulating mineral micro-sand lifted by negative pressure is sprayed out under the power of compressed air in a hydrocyclone at the inlet of a sand washer to break up silt floccules, the silt is separated under the action of the hydrocyclone centrifugal force, mud water with lighter specific gravity flows out from a mud pipe 8 at the upper part of the cyclone to a mud pond for concentration treatment, heavy sand particles sink along the cyclone under the action of the cyclone and are output to the sand washer, sand cleaned by the sand washer is lifted to the outlet of the sand washer by a screw conveyor, and is put into a flocculation zone after sodium hypochlorite is oxidized, and sand washing wastewater is discharged to a coagulation zone.
The circulating mineral micro sand is mainly composed of manganese, iron, quartz sand and the like. Because of containing iron component, set up sodium hypochlorite dosing pipe 7 at sand washer play sand mouth to make sodium hypochlorite medicament and mineral substance sand fully fuse with the spraying mode, and make ferric iron react with sodium hypochlorite solution under alkaline condition and produce the homoferric acid radical, the ferrate has very strong oxidability, consequently can disinfect through oxidation. Meanwhile, as the reduction product after the reaction is ferric hydroxide, the reaction product has the property of colloid, can adsorb suspended impurities in water, can more easily gather suspended matters in water to form precipitate, and can achieve the aim of efficiently removing fine suspended matters in water by combining with PAM.
The small floccules formed by coagulation are mixed with flocculant PAM in a flocculation area, a slow stirrer is used for stirring under the action of 40-90 r/min according to the water quantity and water quality change by adopting a closed loop control mode and is lifted in a vertical guide cylinder, so that the sewage inside and outside the guide cylinder is fully mixed and circulated, the residence time of the sewage in a flocculation sand adding area is prolonged, the mineral micro sand is used as a core to form floccules with larger density and heavier, and the rapid sedimentation in a conical hopper in a sedimentation tank is facilitated. The mixed material in the flocculation zone enters the uniform distribution zone 300 through channel ii 203.
3. Uniform water distribution area
Structural layout form: a plurality of water distribution pipes (circular pipe-shaped and/or rectangular pipelines) are mutually communicated and arranged to form a planar net structure. The uniform water distribution area is distributed between each conical hopper and the inclined pipe of the conical hopper inclined pipe sedimentation area, water is uniformly distributed downwards above each conical hopper, and the water distribution pipes are connected in a welding mode; the size of the caliber of the water distribution pipe is calculated according to the water inflow and the highest water head pressure of 0.5 meter of standard pipeline pressure flow. The water inlet of the uniform water distribution area is a channel II 203, and water flows downwards.
The uniform water distribution area is arranged in the tank body III, and the tank body III is internally provided with a plurality of partition layout forms according to functional layering: the bottom is provided with a plurality of conical hoppers 9 which are sequentially upwards arranged into a uniform water distribution area 300, an inclined pipe 15 and an aeration denitrification water outlet area 400.
According to different water treatment quantity standards, the hydraulic curve water distribution load is calculated, a water head of 0.5 meter is guaranteed to ensure that water distribution in each sedimentation area is uniform, the flocculant promotes the small flocs entering the sedimentation area to form larger flocs through adsorption, electric neutralization and bridging among the flocculation areas, the functions of prolonging the water flow direction and uniform water distribution not only ensure that the medicines and the flocs can be fully mixed, but also can not destroy the formed large flocs, but also can not disturb the deposited sludge at the bottom, so that the sludge deposition is more uniform.
4. Conical bucket inclined tube sedimentation zone
Structural layout form: the device comprises an inclined tube 15, a sedimentation area and a negative pressure lifting device, wherein the inclined tube is positioned above the uniform water distribution area, and a water collecting tank 14 is arranged above the inclined tube 15; the sedimentation zone is arranged at the bottom and is formed by horizontally arranging a plurality of conical hoppers 9; the negative pressure lifting device comprises a plurality of vertical lifting pipes 10, a silt pipe 11 and a compressed air pipe 12, and a pressure regulating valve 20 is arranged on the compressed air pipe 12; the lower end of each vertical riser 10 extends into a conical hopper, and in the process that the mixed material in the uniform water distribution area flows upwards from the bottom of the inclined tube to the water collecting tank 14, particles and flocs in the mixed material are deposited on the surface of the inclined plate and slide downwards under the action of gravity and are deposited into the conical hopper. The upper end of each vertical blow-down pipe is communicated with the silt pipe 11, the middle upper part of the side wall of each vertical blow-down pipe is connected to the compressed air pipe 12 through a branch pipe, and the compressed air pipe is connected with the air compressor 13; the mud sand pipe 11 is connected with the feed inlet of the hydrocyclone 6, the top end of the hydrocyclone 6 is provided with a mud pipe 8 for discharging separated mud materials, the feed inlet is arranged on the upper part of the side wall of the hydrocyclone, the sand outlet is arranged at the bottom of the hydrocyclone, and the end part of the sand outlet extends into the sand washer 5.
A sludge interface instrument 18 is arranged at the position of 0.2 m above the uniform water distribution area, and an SS on-line monitor 19 is arranged at the height position of the bottom of the water collecting tank.
The main process equipment comprises: the device comprises a chute 1 sleeve, a negative pressure lifting device 1 sleeve, an air compressor 1, a sludge interface instrument 1, an SS on-line monitoring instrument 1, a pneumatic control device 1 sleeve, a PLC automatic control system 1 sleeve and a liquid level switch 1.
The process control principle:
the uniform water distribution enters the bottom of the inclined tube of the sedimentation tank and then flows upwards to the upper water collecting area, and particles and flocs are precipitated on the surface of the inclined tube and slide downwards under the action of gravity. A continuous self-scraping process can be formed by the rising flow rate of 30-50 m/h, the inclined tube height of 1.2m and the inclination of 60 degrees, so that flocs cannot accumulate on the inclined tube. The sand-containing sludge is deposited in the conical hopper rapidly under the action of gravity, and the sediment deposited at the bottom is lifted to the hydrocyclone device by compressed air in a negative pressure lifting mode to separate the sediment and the sand.
5. Aeration denitrification water outlet area
Structural layout form: a microporous tube type aerator 401 is arranged between the upper part of the inclined tube and the water collecting tank, and compressed air is input into the microporous tube type aerator 401 through an air pipe 402 by using a blower.
The main process equipment comprises: 1 air blower, 1 microporous pipe aerator, 1 air pipeline and 1 water collecting tank.
The process control principle:
the conversion of organic matters in the sewage in the coagulation reaction process can cause the rise of ammonia nitrogen, and partial nitrogen is removed by adopting a chemical adding or aeration mode to promote the conversion of nitrogen. The precipitated water is collected by a stainless steel water collection tank 14 distributed at the top of the inclined plate sedimentation tank and discharged through a water outlet area 16.
6. Control principle of the automatic control system: the PLC automatic control system starts a coagulant dosing pump according to the feedback signal of the flow switch; starting a rapid mixer and a flocculating agent PAM dosing pump of the coagulation area after delaying for 5 minutes; starting a flocculation area slow stirrer after the water level of the flocculation area reaches the requirement; starting a sand washer, a negative pressure circulating device and a sodium hypochlorite dosing pump at intervals of 30 seconds in sequence after the water level of the sedimentation area reaches the requirement; after water inflow is carried out for 30 minutes, a PLC (programmable logic controller) automatic control system collects signals of a sludge interface instrument and an SS (suspended solid) online analyzer, and the air quantity and the air pressure of a pneumatic control cabinet are controlled to change the circulation quantity of the mineral sand lifted by negative pressure through logic operation with a set value of a water inflow flowmeter; and outputs 4-20 mA signals to control the rotation speed of the flocculation mixer and the coagulation mixer; the blower in the aeration denitrification area starts aeration denitrification.
The active carbon adding device is timely put into operation according to laboratory data and process requirements.
7. Selection of mineral sands
The mineral sand comprises quartz sand, manganese ore sand and iron powder; the grain diameter is between 100 and 150 mu m; the mineral sand is formed by mixing quartz sand, manganese ore sand and iron powder according to the weight ratio of 5:2:1.
The process for improving the mineral sand circulation high-speed sedimentation tank by negative pressure can be applied to: (1) The pretreatment section of the standard improvement of a sewage treatment plant and a tap water plant or the stage of the first-stage strengthening treatment of suspended particles can also be applied to the stages of suspended substances, dephosphorization and the like in the advanced treatment stage; (2) An emergency treatment center for intercepting sewage and bottom sludge sewage of river treatment; (3) urban sewage main pipe interception emergency treatment; (4) rain sewage interception emergency treatment; and (5) treating landfill leachate.
The invention can be applied to the oxidation-reduction precipitation stage of high-concentration industrial wastewater after the technical expansion. The technology can be applied to a large sewage treatment plant in a large concrete structure form, and can also be applied to emergency treatment in a steel structure form of modularized combination, such as: in the engineering of river channel treatment, urban main pipe sewage interception, rain sewage interception treatment, sewage treatment plant standard improvement and the like which need first-stage strengthening treatment. The application range and the prospect are very wide.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (7)
1. A process for lifting a mineral sand circulation high-speed sedimentation tank by negative pressure is characterized in that: the process is characterized in that a high-speed sedimentation tank is utilized for sewage treatment, mineral sand is utilized for realizing high-speed sedimentation of impurities in sewage in the treatment process, the precipitated mud sand is separated in a negative pressure lifting mode through compressed air, and the mineral sand is recycled in the sewage treatment process; the high-speed sedimentation tank comprises a coagulation area, a flocculation sand adding area, a uniform water distribution area, a conical bucket inclined tube sedimentation area and an aeration denitrification water outlet area, wherein:
and (3) a coagulation area: mixing coagulant with suspended particles in sewage in a coagulation zone under stirring and forming small flocs; the coagulation area comprises a cylindrical or rectangular Chi Ti, a water inlet pipeline is arranged on the tank body I, and a coagulant dosing pipe is arranged at a water inlet of the water inlet pipeline;
flocculation sand adding area: small floccules formed in the coagulation area enter the flocculation sand adding area and then are mixed with the added flocculant and mineral sand, and the small floccules form large floccules by taking the added mineral sand as a core; the flocculation sand adding area comprises a rectangular tank body II, a vertical guide cylinder and a sand washer, wherein the vertical guide cylinder is arranged in the rectangular tank body II, and a slow stirrer is arranged in the vertical guide cylinder; the sand washer is arranged above the rectangular tank body II and is used for cleaning mineral sand, and a flocculating agent dosing pipe and a mineral sand dosing port are also arranged at the upper part of the rectangular tank body II and are respectively used for adding flocculating agent and mineral sand into a flocculating sand dosing area;
uniform water distribution area: the mixed materials in the flocculation sand adding area enter a uniform water distribution area for uniform distribution; the uniform water distribution area is arranged in the rectangular tank body III and is a planar net structure formed by mutually communicated and distributed multiple water distribution pipes;
conical bucket inclined tube sedimentation zone: the device comprises an inclined tube, a sedimentation zone and a negative pressure lifting device, wherein the sedimentation zone is formed by uniformly arranging a plurality of conical hoppers in the horizontal direction, the sedimentation zone is positioned below the uniform water distribution zone, the inclined tube is positioned above the uniform water distribution zone, and a water collecting tank is arranged above the inclined tube; the negative pressure lifting device comprises a plurality of vertical blow-down pipes, and the lower end of each blow-down pipe extends into a conical hopper; in the process that the mixed material in the uniform water distribution area flows upwards from the bottom of the inclined plate to the water collecting tank, particles and flocs in the mixed material are deposited on the surface of the inclined plate and slide downwards under the action of gravity and are deposited in the conical hopper;
aeration denitrification water outlet area: a microporous tube type aerator is arranged between the upper end of the inclined tube and the water collecting tank, and air is blown in by a blower to realize dosing or aeration in the water body, so that nitrogen in the water body is promoted to be converted, and partial nitrogen is removed; the water after denitrification treatment is collected by a water collecting tank and discharged;
the inlet of the sand washer is provided with a hydrocyclone, and the sand outlet of the sand washer is provided with a sodium hypochlorite dosing pipe; the mineral sand separated by the hydrocyclone separator enters a sand washer, the mineral sand washed by the sand washer is lifted to a sand washer outlet by a screw conveyor in the sand washer, sodium hypochlorite medicament is fully mixed with the mineral sand in a spraying manner at the sand washer outlet, the mineral sand is oxidized and then is put into a flocculation sand adding area, and sand washing wastewater can be discharged to a coagulation area;
the mineral sand is formed by mixing quartz sand, manganese ore sand and iron powder according to the weight ratio of 5:2:1.
2. The process for lifting a mineral sand circulation high-speed sedimentation tank by negative pressure according to claim 1, wherein: in the coagulation zone, a pipeline mixer is arranged at the water inlet of a water inlet pipeline, an electromagnetic flowmeter is arranged on the water inlet pipeline, and a rapid stirrer is further arranged on the tank body I.
3. The process for lifting a mineral sand circulation high-speed sedimentation tank by negative pressure according to claim 1, wherein: in the flocculation sand adding area, the slow stirrer is controlled to stir at the rotating speed of 40-90 r/min in a closed-loop control mode according to the water quantity and water quality change, so that the sewage circulation flow inside and outside the guide cylinder is more fully mixed, and the residence time of the sewage in the flocculation sand adding area is prolonged.
4. The process for lifting a mineral sand circulation high-speed sedimentation tank by negative pressure according to claim 1, wherein: the rectangular tank body I and the rectangular tank body II of the high-speed sedimentation tank are communicated through a bottom channel I, the rectangular tank body II and the rectangular tank body III are separated by a baffle, and a channel II is formed in the middle of the baffle; one end of the bottom channel I is arranged at the bottom of the rectangular tank body I, and the other end of the bottom channel I is arranged at the bottom of the rectangular tank body II and is positioned right below the guide cylinder; the mixed material in the flocculation sand adding area enters the uniform water distribution area through the channel II, flows upwards to the channel II, and then flows downwards to the uniform water distribution area.
5. The process for lifting a mineral sand circulation high-speed sedimentation tank by negative pressure according to claim 1, wherein: the negative pressure hoisting device comprises a plurality of vertical blow-down pipes, silt pipes and compressed air pipes, wherein: the upper end of each vertical blow-down pipe is communicated with the silt pipe, and the middle upper part of the side wall of each vertical blow-down pipe is connected to the compressed air pipe through a branch pipe; the mud sand pipe is connected with the feed inlet of the hydrocyclone, the top end of the hydrocyclone is provided with a mud pipe for discharging separated mud, the feed inlet is arranged on the upper part of the side wall of the hydrocyclone, the sand outlet is arranged at the bottom of the hydrocyclone, and the end part of the sand outlet extends into the sand washer.
6. The process for lifting a mineral sand circulation high-speed sedimentation tank by negative pressure according to claim 1, wherein: in the conical bucket inclined tube sedimentation zone, a compressed air tube is connected with an air compressor; the height of the inclined tube is 1.2m, the included angle between the inclined tube and the horizontal direction is 60 degrees, and the design of the inclined plate height and the inclined angle forms a continuous self-scraping process, so that flocs cannot accumulate on the inclined tube.
7. The process for lifting a mineral sand circulation high-speed sedimentation tank by negative pressure according to claim 1, wherein: the process is used for the precipitation treatment stage in the water treatment fields of urban domestic sewage treatment, industrial wastewater treatment, river sewage treatment and sediment treatment, water works or landfill leachate and the like.
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| CN113072153A (en) * | 2021-06-07 | 2021-07-06 | 北京水利发展有限公司 | Medical waste water is from mixing purification unit |
| CN113968608B (en) * | 2021-06-25 | 2023-07-18 | 北京绿恒科技有限公司 | Self-circulation encryption granular sludge filtering sedimentation tank |
| CN113968641B (en) * | 2021-06-25 | 2022-06-17 | 北京绿恒科技有限公司 | Self-circulation high-density suspended sludge filter and water treatment system |
| CN114031203B (en) * | 2021-06-25 | 2023-09-05 | 北京绿恒科技有限公司 | Self-circulation high-density suspended sludge filtering and settling water purifier |
| CN116409909B (en) * | 2023-06-09 | 2023-08-18 | 深圳永清水务有限责任公司 | Device for treating waste water generated by assay or detection |
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