CN113877252A - Concentrated sludge discharge method and application and magnetic sedimentation tank - Google Patents
Concentrated sludge discharge method and application and magnetic sedimentation tank Download PDFInfo
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- CN113877252A CN113877252A CN202111267237.2A CN202111267237A CN113877252A CN 113877252 A CN113877252 A CN 113877252A CN 202111267237 A CN202111267237 A CN 202111267237A CN 113877252 A CN113877252 A CN 113877252A
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- 239000010802 sludge Substances 0.000 title claims abstract description 123
- 238000004062 sedimentation Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 230000007246 mechanism Effects 0.000 claims abstract description 43
- 230000009471 action Effects 0.000 claims abstract description 22
- 238000007599 discharging Methods 0.000 claims abstract description 12
- 238000001179 sorption measurement Methods 0.000 claims abstract description 7
- 230000002776 aggregation Effects 0.000 claims abstract description 4
- 238000004220 aggregation Methods 0.000 claims abstract description 4
- 238000001556 precipitation Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000002351 wastewater Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 4
- 239000010963 304 stainless steel Substances 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000000696 magnetic material Substances 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 19
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000010865 sewage Substances 0.000 description 11
- 238000005345 coagulation Methods 0.000 description 10
- 230000015271 coagulation Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000005389 magnetism Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007790 scraping Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000005426 magnetic field effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
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- 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
- B01D21/0009—Settling tanks making use of electricity or magnetism
-
- 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
- B01D21/245—Discharge mechanisms for the sediments
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a concentrated sludge discharge method, application and a magnetic sedimentation tank, wherein the method is characterized in that a magnetic field action area is arranged at a sludge discharge port of the magnetic sedimentation tank, concentrated by magnetic adsorption and aggregation, and the concentrated sludge is pushed to be discharged by a sludge discharge screw mechanism; the magnetic sedimentation tank comprises a tank body, a sludge discharge spiral mechanism and a magnetic component, wherein the sludge discharge spiral mechanism is arranged on the tank body; the concentrated sludge discharge method and the magnetic sedimentation tank can improve the sludge discharge concentration of the sedimentation tank and reduce the water content of the discharged sludge, thereby reducing the load of subsequent magnetic seed recovery equipment, improving the magnetic seed recovery efficiency and reducing the loss of magnetic seeds; the invention provides a sedimentation and sludge concentration integrated device, a concentration tank is not required to be additionally arranged, and the occupied area is reduced; the necessity of sludge backflow is reduced by concentrating and discharging sludge, and a sludge backflow system can be eliminated; the invention can obviously reduce energy consumption, investment and operation cost.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a method for concentrating and discharging sludge and a magnetic sedimentation tank with a function of concentrating and discharging sludge.
Background
The magnetic precipitation technology is characterized in that magnetic seeds are added in the traditional coagulation precipitation technology, so that flocs generated by coagulation reaction are tighter and higher in density, the magnetic flocs are easy to precipitate, the retention time is shortened, and the precipitation efficiency is improved. Due to the faster sedimentation speed, the magnetic precipitation technology has been widely applied to municipal sewage dephosphorization and upgrading and replaces the traditional sedimentation tank for industrial wastewater treatment. The technological process of the magnetic precipitation system comprises the steps of adding magnetic seeds and a medicament into sewage, combining incompatible pollutants, colloid and magnetic seeds in the sewage to form magnetic flocs through coagulation reaction, enabling the sewage to enter the magnetic precipitation system to complete solid-liquid separation, discharging clear water, discharging precipitated magnetic sludge from a precipitation tank, enabling the flocs to be broken through high-speed shearing of the concentrated sludge, enabling the sludge to enter a magnetic separation recovery system, circularly adding the recovered magnetic seeds into the coagulation reaction system, and enabling nonmagnetic sludge to enter a dehydration system for treatment.
Usually, the lower part mud of magnetism sedimentation tank is concentrated the district and is provided with mud scraping mechanism or sludge bucket, and mud and water discharge together through the sludge pump under the static pressure effect, lead to the magnetic floc mud moisture content of exhaust high, lead to subsequent magnetism kind recovery system load big, the energy consumption is high, and magnetism kind recovery efficiency low loss is many, and the big working costs of magnetism kind replenishment volume is high, and retrieves the link at magnetism kind and cause environmental pollution along with the magnetism kind that non-magnetism mud runs off easily. One solution is to arrange a concentration tank to concentrate the high-water-content sludge discharged by magnetic precipitation, the concentrated sludge enters a magnetic seed recovery system, the separated magnetic seeds are circularly fed into a coagulation reaction system, and the separated non-magnetic sludge enters a dehydration system to be dehydrated. The arrangement of the concentration tank increases the occupied area and the investment and operation cost. The other solution is to arrange a sludge return system and directly return the sludge part of the sedimentation tank to the coagulation reaction tank, thereby reducing the load of the magnetic seed recovery system. Partial sludge directly flows back, and magnetic seeds and non-magnetic sludge are not effectively separated, so that the utilization efficiency of the magnetic seeds is reduced, the concentration of suspended matters in a coagulation reaction area is increased, the use amount of a medicament is correspondingly increased, and the operating cost is increased. Another solution is to connect a magnetic recovery device, usually a magnetic rod assembly, to the mud discharge end of the magnetic recovery device, and the slag removal of the magnetic rod assembly is usually performed manually, which makes it difficult to achieve continuous and efficient operation.
The invention patent with the publication number of CN211536652U found by retrieval discloses a mobile magnetic sedimentation device applied to the upgrading and transformation of a sewage plant, which comprises a magnetic sedimentation tank, a water inlet channel, a sludge discharge mechanism, a sludge conveying mechanism and a water outlet structure, wherein the water inlet channel comprises a water inlet hole and a diversion trench, and the diversion trench is inclined downwards; the sludge discharge mechanism is arranged on one side of the diversion trench, and a preset included angle is kept between the sludge discharge mechanism and the bottom surface; the mud conveying mechanism comprises a mud scraping component, a driving mechanism and a transmission mechanism, and the transmission mechanism comprises a first roller, a second roller and a magnetic conveying belt; the mud scraping component is arranged on one side of the magnetic conveying belt, which is provided with the first roller, and is in contact with the magnetic conveying belt; the water outlet structure comprises a clear water area, at least one water outlet weir is arranged in the clear water area, and water outlet holes which are in one-to-one correspondence with the water outlet weir and communicated with the water outlet weir are arranged on one side of the magnetic sedimentation tank, which is far away from the water inlet hole. The equipment has a complex structure, and the magnetic conveying belt arranged at the bottom has high cost, poor reliability and difficult maintenance.
Disclosure of Invention
Therefore, in order to overcome the defects, the invention provides the magnetic sedimentation tank with the functions of concentrating and discharging sludge and the sludge concentrating method, wherein the magnetic sedimentation tank is reasonable in design and ingenious in structure; the concentrated sludge discharge method and the magnetic sedimentation tank can improve the sludge discharge concentration of the sedimentation tank and reduce the water content of discharged sludge, thereby reducing the load of subsequent magnetic seed recovery equipment, improving the magnetic seed recovery efficiency and reducing the loss of magnetic seeds.
A method for concentrating and discharging sludge, which comprises the following steps,
arranging a magnetic field action area at a sludge discharge port of the magnetic sedimentation tank;
the sludge is concentrated in the magnetic field action area through magnetic adsorption and aggregation;
and a sludge discharge spiral mechanism is arranged in cooperation with the magnetic field action area to push the concentrated sludge to be discharged.
The method can be applied to sludge discharge of a magnetic sedimentation tank or sludge discharge of magnetic wastewater in a steel mill.
The method can obviously reduce the water content of the discharged sludge of the magnetic sedimentation tank, reduce the load of subsequent magnetic seed recovery equipment, improve the recovery rate of the magnetic seeds and reduce the operation cost.
The magnetic sedimentation tank in the method comprises
The water storage tank comprises a tank body and a water storage tank, wherein the tank body is provided with a containing cavity, and a water inlet and a water outlet are formed in the tank body;
sewage after magnetic coagulation reaction enters a containing cavity of the box body from a water inlet, the upper part of the containing cavity is a clear water area, the clear water area is provided with a water collecting tank, and the water collecting tank is communicated with a water outlet on the box body;
the lower part of the clear water area of the box body is provided with an inclined tube sedimentation area, the lower part of the inclined tube sedimentation area is provided with a sludge sedimentation area, and the lower part of the sludge sedimentation area is a sludge concentration area;
the sludge concentration area is provided with a sludge discharge spiral mechanism, the sludge discharge spiral mechanism comprises a spiral shaft, spiral blades and a driving motor, and the sludge discharge spiral mechanism is arranged in the sludge concentration area at the bottom of the box body;
an annular magnetic component is arranged at the discharge end of the sludge discharge spiral mechanism in a matching way, the magnetic component can generate an annular inward magnetic field action area, and sludge pushed out by the sludge discharge spiral mechanism is concentrated by magnetic adsorption in the magnetic field action area and then discharged; specifically, the magnetic component is arranged on the box body and communicated with the discharge end of the sludge discharge spiral mechanism; the helical blade is matched with the inner wall of the magnetic component, and the helical blade pushes the magnetic force to adsorb the concentrated sludge and discharge the concentrated sludge.
Preferably, the diameter of the screw shaft of the sludge discharge screw mechanism in the magnetic field action zone is gradually increased, and the arrangement aims to reduce the discharge amount of sewage through the magnetic field action zone and improve the sludge concentration effect.
Preferably, the magnetic component comprises an inner cylinder and an outer cylinder, a magnet assembly for generating an inward emission magnetic field is arranged between the inner cylinder and the outer cylinder, and the magnetic component is connected with the box body and communicated with the discharge end of the sludge discharge spiral mechanism; the inner cylinder is matched with a helical blade of the sludge discharge helical mechanism; the inner cylinder is made of a non-magnetic material (such as 304 stainless steel), and the outer cylinder is made of a material (such as carbon steel) capable of shielding a magnetic field.
Preferably, the magnet assembly is a whole, or is formed by uniformly arranging a plurality of small magnetic blocks, or is formed by uniformly arranging a plurality of magnetic bars.
The magnetic sedimentation tank is reasonable in design and ingenious in structure, has a function of concentrating and discharging sludge, and reduces the water content of the discharged sludge by adopting the cooperation of the sludge discharge spiral mechanism and the magnetic component, so that the load of subsequent magnetic seed recovery equipment is reduced, the magnetic seed recovery efficiency is improved, and the loss of magnetic seeds is reduced; the invention provides a sedimentation and sludge concentration integrated device, a concentration tank is not required to be additionally arranged, and the occupied area is reduced; the necessity of sludge backflow is reduced by concentrating and discharging sludge, and a sludge backflow system can be eliminated; the invention can obviously reduce energy consumption, investment and operation cost.
Drawings
FIG. 1 is a side schematic view of the present invention;
FIG. 2 is a schematic elevation view of the present invention;
FIG. 3 is a schematic cross-sectional view of a first configuration of a magnetic element of the present invention;
FIG. 4 is a schematic cross-sectional view of a second configuration of a magnetic element of the present invention;
FIG. 5 is a schematic cross-sectional view of a third configuration of a magnetic element of the present invention;
FIG. 6 is a schematic cross-sectional view of a fourth configuration of the magnetic element of the present invention;
in the figure: 1. a water inlet; 2. a sludge settling zone; 3. an inclined tube settling zone; 4. a clear water zone; 5. a water outlet; 6. a sludge discharge screw mechanism; 7. a magnetic member; 71. an outer barrel 72, an inner barrel; 8. a magnet assembly.
Detailed Description
In order to realize the concentration of the magnetic sludge discharge, the embodiment of the invention provides a concentrated sludge discharge method applied to a magnetic sedimentation tank, in particular,
arranging a magnetic field action area at a sludge discharge port of the magnetic sedimentation tank;
the sludge is concentrated in the magnetic field action area through magnetic adsorption and aggregation;
and a sludge discharge spiral mechanism is arranged in cooperation with the magnetic field action area to push the concentrated sludge to be discharged.
The method can obviously reduce the water content of the discharged sludge of the magnetic sedimentation tank, reduce the load of subsequent magnetic seed recovery equipment and improve the recovery rate of the magnetic seeds.
The method can be applied to the sedimentation sludge discharge of the wastewater containing magnetic substances in a steel mill to realize the concentration and discharge of the wastewater containing the magnetic substances, has the same principle as the concentration sludge discharge principle of a magnetic sedimentation tank, and realizes the sludge discharge concentration by adopting the cooperation of a sludge discharge spiral mechanism and a magnetic component.
The magnetic sedimentation tank will be described in detail with reference to the accompanying drawings, as shown in fig. 1, the magnetic sedimentation tank comprises a tank body, a sludge discharge screw machine mechanism 6 and a magnetic force component 7,
the box body is provided with a water inlet 1 and a water outlet 5, sewage (containing magnetic waste water in a steel mill) after magnetic coagulation reaction enters the box body from the water inlet 1 of the box body, the upper part of the box body is a clear water area 4, the clear water area 4 is provided with a water collecting tank, and the water collecting tank is communicated with the water outlet 5 on the box body; 4 lower parts in the clear water district of box are provided with pipe chute settling zone 3, and the lower part in pipe chute settling zone sets up to sludge settling zone 2, and sludge settling zone's lower part is the mud and concentrates the district, delivery port 1 sets up in sludge settling zone 2, delivery port 5 is located the clear water district.
As shown in fig. 2, a sludge discharge screw mechanism 6 is arranged in a sludge concentration area at the bottom of the tank body, and comprises a screw shaft, a screw blade and a driving motor, wherein the driving motor drives the screw blade arranged on the screw shaft to rotate; at row's mud screw mechanism's discharge end, cooperate and be provided with annular magnetic force component 7, this magnetic force component 7 is installed on the box and is linked together with row's mud screw mechanism 6 discharge end to can produce the inward magnetic field effect district of annular, row's mud screw mechanism 6 promotes mud and adsorbs the concentration through magnetic field effect district magnetic force, row's mud screw mechanism 6 helical blade cooperatees with magnetic force component's inner wall, and helical blade promotes the concentrated mud of magnetic force adsorption and discharges from the discharge gate.
In this embodiment, the diameter of the screw shaft of the sludge discharge screw mechanism 6 is gradually increased in the magnetic field acting section, and the screw blade is engaged with the inner wall of the magnetic member.
As shown in fig. 3-6, in this embodiment, the magnetic member 7 comprises an inner cylinder 72 and an outer cylinder 71, a magnet assembly 8 for generating an inward-emitting magnetic field is arranged between the inner cylinder 72 and the outer cylinder 71, and the magnetic member 7 is connected with the box body and communicated with the discharge end of the sludge discharge screw mechanism 6; the inner cylinder 72 is matched with a helical blade of the sludge discharge helical mechanism 6; the inner cylinder 72 is made of a non-magnetic conductive material (e.g., 304 stainless steel), and the outer cylinder 71 is made of a material (e.g., carbon steel) capable of shielding a magnetic field.
In the present embodiment, as shown in fig. 3, the magnet assembly 8 is formed by a plurality of axial magnetic bars uniformly arranged in a circular array; or as shown in fig. 4, the magnet assembly 8 is formed by uniformly arranging a plurality of magnetic blocks with tile-shaped cross sections; or as shown in fig. 5, the magnet assembly 8 is formed by uniformly arranging a plurality of magnetic blocks with rectangular cross sections; or as shown in fig. 6, the magnet assembly is an integral ring magnet.
As shown in fig. 1 and 2, when the magnetic sedimentation tank is used, sewage (or wastewater containing magnetic substances in a steel mill) after magnetic coagulation reaction enters the tank body from the water inlet 1, sludge is settled in the sludge concentration area under the action of the inclined tube sedimentation area and the inclined tube sedimentation area, and water in the clean water area 4 is discharged through the water collecting tank through the water outlet 5; after the sludge is settled, the sludge is concentrated by magnetic adsorption in a magnetic field action area and the concentrated sludge is pushed to be discharged by a sludge discharge screw mechanism.
The sludge gathering and concentrating process is that the driving motor drives the screw shaft to rotate, the rotating screw shaft drives the screw blades to push the sludge to enter the magnetic field acting area, and the sludge is gathered and concentrated on the inner wall of the magnetic component through magnetic absorption;
the process that the sludge discharge screw mechanism pushes the concentrated sludge to be discharged is that the screw blade positioned in the magnetic field action area continuously rotates to push the concentrated sludge to be discharged, and meanwhile, the diameter of the screw shaft positioned in the magnetic field action area is gradually increased, so that the discharge amount of sewage through the magnetic field action area can be reduced, and the sludge concentration effect is improved.
The magnetic sedimentation tank reduces the water content of discharged mud by matching the mud discharge spiral mechanism with the magnetic component, thereby reducing the load of subsequent magnetic seed recovery equipment, improving the magnetic seed recovery efficiency and reducing the loss of magnetic seeds; the invention provides a sedimentation and sludge concentration integrated device, a concentration tank is not required to be additionally arranged, and the occupied area is reduced; the sludge concentration and discharge also reduces the necessity of sludge backflow, and a sludge backflow system can be eliminated.
In this embodiment, the magnetic sedimentation tank body may be a steel structure, a glass fiber reinforced plastic structure, or a concrete structure in specific implementation.
Claims (10)
1. A concentrated sludge discharge method is characterized by comprising the following steps:
arranging a magnetic field action area at a sludge discharge port of the magnetic sedimentation tank;
the sludge is concentrated in the magnetic field action area through magnetic adsorption and aggregation;
a sludge discharge spiral mechanism is arranged in cooperation with the magnetic field action area and pushes the concentrated sludge to be discharged.
2. Use of the method according to claim 1 for the sludge concentration in the sludge precipitation of wastewater containing magnetic substances from steel mills.
3. A magnetic sedimentation tank as claimed in claim 1 or 2, wherein: comprises that
The box body is internally provided with a containing cavity which is sequentially divided into a clear water area, a sludge settling area and a sludge concentration area from top to bottom;
the sludge discharge spiral mechanism is arranged in the sludge concentration area; and
the magnetic force component is matched with the mud discharging spiral mechanism and is installed in the box body, wherein the discharge end of the mud discharging spiral mechanism is communicated with the magnetic force component, and an annular inward magnetic field action area is formed inside the magnetic force component.
4. A magnetic sedimentation tank as claimed in claim 3, wherein: the magnetic component comprises an inner cylinder and an outer cylinder, and a magnet assembly capable of generating an inward emission magnetic field is arranged between the inner cylinder and the outer cylinder.
5. A magnetic sedimentation tank in accordance with claim 4, wherein: the magnet assembly is a whole, or is formed by uniformly arranging a plurality of magnetic blocks, or is formed by uniformly arranging a plurality of magnetic bars.
6. A magnetic sedimentation tank in accordance with claim 5, wherein: the cross section of the magnetic block is tile-shaped or rectangular.
7. A magnetic sedimentation tank in accordance with claim 4, wherein: the inner cylinder is made of a non-magnetic material, and the outer cylinder is made of a material capable of shielding a magnetic field.
8. A magnetic sedimentation tank as claimed in claim 7, wherein: the inner cylinder is made of 304 stainless steel and the outer cylinder is made of carbon steel.
9. A magnetic sedimentation tank as claimed in claim 3, wherein: the mud discharging screw mechanism comprises a screw shaft, a screw blade matched with the screw shaft and a driving motor for driving the screw shaft to rotate, wherein the diameter of the screw shaft in a magnetic field action section is gradually increased, and the screw blade positioned in the magnetic field action section is matched with the inner wall of the magnetic component.
10. A magnetic sedimentation tank as claimed in claim 3, wherein: a water inlet and a water outlet are arranged on the box body, wherein the water inlet is arranged in the sludge settling area, and the water outlet is positioned in the clear water area;
the clear water area is provided with a water collecting tank which is communicated with a water outlet on the box body;
and an inclined tube settling zone is arranged at the lower part of the clean water zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111267237.2A CN113877252A (en) | 2021-10-29 | 2021-10-29 | Concentrated sludge discharge method and application and magnetic sedimentation tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111267237.2A CN113877252A (en) | 2021-10-29 | 2021-10-29 | Concentrated sludge discharge method and application and magnetic sedimentation tank |
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| CN113877252A true CN113877252A (en) | 2022-01-04 |
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| CN202111267237.2A Pending CN113877252A (en) | 2021-10-29 | 2021-10-29 | Concentrated sludge discharge method and application and magnetic sedimentation tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114573080A (en) * | 2022-02-16 | 2022-06-03 | 中节能兆盛环保有限公司 | Magnetic material retrieval and utilization hoisting device |
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