Classifications

• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/02—Aerobic processes
  • C02F3/12—Activated sludge processes
  • C02F3/22—Activated sludge processes using circulation pipes
  • C02F3/223—Activated sludge processes using circulation pipes using "air-lift"
• • 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
  • B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
• • 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
• • 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
  • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
  • B01D21/0042—Baffles or guide plates
• • 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
  • B01D21/0087—Settling tanks provided with means for ensuring a special flow pattern, e.g. even inflow or outflow
• • 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
  • B01D21/18—Construction of the scrapers or the driving mechanisms for settling tanks
  • B01D21/20—Driving mechanisms
• • 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
  • B01D21/2427—The feed or discharge opening located at a distant position from the side 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
  • B01D21/28—Mechanical auxiliary equipment for acceleration of sedimentation, e.g. by vibrators or the like
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W10/00—Technologies for wastewater treatment
  • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

• the present invention relates to a settling apparatus having an aeration tank built therein, and more particularly, to a settling apparatus, which includes an aeration tank integrally embedded in a central portion or on a side of a settling tank without the need of a power machine (hereinafter, referred to as "scraper") for collecting microorganisms (hereinafter, referred to as "sludge”) and a return pump for returning the sludge to the aeration tank.
• a power machine hereinafter, referred to as "scraper”
• sludge microorganisms
• a typical settling apparatus serves to settle sludge by gravity and discharge treated water (supernatant) through a wier after staying introduced sewage (including the sludge).
• the settled sludge is collected to a front end or the center of a settling tank by a scraper, and then, returned to an (organism) aeration tank by a pump and some sludge is wasted as a surplus sludge.
• the amount of the return sludge is 20 to 100 percent of a normal inflow amount, the return sludge increases a load of suspended solids to thereby have an influence on efficiency of the settling tank since the return sludge is ultimately re-introduced into the settling tank.
• the inflow amount of the introduced water is changed greatly, since the amount of the inflow water of the settling tank is increased due to the return sludge and the inflow amount, it has an adverse influence on a settling performance.
• the sludge exceeding a treatment capacity of the settling tank is discharged through the wier to thereby deteriorate the quality of water.
• the height of a sludge layer of the settling tank is sensitive to a change in the inflow amount of the introduced water. Accordingly, a little increase of the sludge layer by the change in the inflow amount of the introduced water may cause deterioration in the quality of discharged water. Furthermore, the conventional sewage treatment system has several problems in that it must keep a predetermined difference in water level since the aeration tank and the settling tank are separated from each other, and in that it requires devices and energies for collecting and returning the sludge.
• Korean Patent No. 0382810 discloses a technology for preventing deterioration in quality of outflow water since a settling tank has a sludge storing capacity to some extent even though the sludge layer rises.
• the treatment system since the treatment system has to simultaneously accept the amount of returned sludge and the inflow amount of the introduced water, it has a limitation in guaranteeing the quality of water according to a change in the inflow amount. Disclosure of Invention Technical Problem
• the present invention has been made in an effort to solve the above- mentioned problems occurring in the prior arts, and it is an object of the present invention to provide a settling apparatus having an aeration tank built therein, which includes a settling tank and an aeration tank integrated with the settling tank without the need of a scraper for collecting sludge.
• Another object of the present invention is to provide a settling apparatus having an aeration tank built therein, which performs only an internal return without any external return, thereby minimizing consumption of facilities and energies.
• sewage to be treated is defined as waste water
• water which is under treatment is defined as treating water
• water to be discharged after treatment is defined as treated water or supernatant.
• the present invention provides a settling apparatus having an aeration tank built therein comprising: (A) a main body having an outer wall and a base; (B) an aeration tank and a settling tank divided from each other by a partition, which is opened at a lower portion thereof, inside the main body; (C) sewage inducing means connected to the aeration tank; (D) at least one air diffusing means mounted in a lower portion of the aeration tank; and (E) treated water discharging means mounted on an upper portion of the settling tank.
• the settling apparatus includes an aeration tank and a settling tank divided from each other by a partition, which is opened at a lower portion thereof, and air diffusing means mounted in a lower portion of the aeration tank, so that sewage introduced into the aeration tank is circulated due to aeration by the air diffusing means and treated water is discharged through the discharging means from the upper portion of the settling tank.
• the outer wall, the base and the partition may be made of materials generally used in typical water treatment systems, for instance, concrete, synthetic resin or metal.
• the aeration tank and the settling tank may be respectively located at right and left sides of the main body, but it is preferable that the aeration tank is located at the center of the main body and the settling tank is located outside the aeration tank.
• the settling apparatus has a circular or a rectangular plane, and in this instance, the partition may be in a cylindrical form or a polyhedral form. That is, the aeration tank is located at the center of the main body and the settling tank surrounds the aeration tank by the cylindrical or polyhedral partition.
• the partition may be in a plate form.
• the aeration tank is located at the central portion of the main body and the settling tank is located outside the aeration tank by the two plate-type partitions formed at both sides of the main body.
• the inclined wall is mounted between the outer wall and the base so that the sludge settled in the settling tank can lower smoothly and circulated to the inside of the aeration tank.
• the laminar flow means for regulating water current between the aeration tank and the settling tank is mounted beneath the partition to circulate treating water between the aeration tank and the settling tank smoothly.
• the water current inducing means is mounted outside the air diffusing means to induce and control a circulation of the water current and sludge when bubbles rise by the air diffusing means of the aeration tank.
• forms of the laminar flow means and the water current inducing means are dependent upon the forms of the partition. That is, in case where the partition is in the cylindrical form, it is preferable that the laminar flow means is in an opened reverse-conical form and the water current inducing means is in a cylindrical form. Additionally, in case where the partition is in the plate form, it is preferable that also the laminar flow means and the water current inducing means are all in the plate form.
• a barrier for promoting the discharge of the treated water and restraining the discharge of the sludge is mounted on the upper portion of the settling tank.
• the barrier may be fabricated through a method that a supporter having a plurality of drain holes formed inclinedly or a plurality of water-permeable holes formed on upper and lower portions thereof is filled with floating filter media.
• the partition is variable in its height for a case that treatment conditions are changed according to changes in an inflow amount or component characteristics of sewage.
• One or all of the two partitions may be variable in height, and those skilled in the art can easily select one from related techniques in connection with the above.
• the partition lowers to reduce the internal circulation of the sludge (aeration tank ⁇ settling tank) in case where the height of a sludge layer of the settling tank excessively lowers according to a change of the conditions, the partition rises to increase the internal circulation of the sludge in case where the sludge layer rises excessively.
• the settling apparatus according to the present invention can be used in substitute for a conventional cuboid (rectangular) or cylindrical settling tank in a sewage treatment process, and hence, it can save equipment expenses and operating expenses since it does not need mechanisms and operating devices to collect the sludge at the center or the front end thereof.
• the settling apparatus according to the present invention can provide good economical efficiency and treatment efficiency owing to saving of energy since the quality of treated water can be greatly improved through filtering of the sludge layer.
• FIG. 1 is a view of a conventional settling tank.
• FIG. 2 is a sectional view showing examples of a settling apparatus having an aeration tank built therein according to the present invention.
• FIG. 3 is a plan view showing the examples of the settling apparatus having the aeration tank therein according to the present invention.
• FIG. 4 is a conceptual view of a sewage treatment system, to which the settling apparatus having the aeration tank therein according to the present invention is applied.
• FIG. 5 is a conceptual view of a nitrogen and phosphorus treatment system, to which the settling apparatus having the aeration tank therein according to the present invention is applied. [30] ⁇ Explanation of essential reference numerals in drawings>
• [31] 1 settling apparatus having an aeration tank therein (main body)
• FIG. 2 is a sectional view showing examples of a settling apparatus having an aeration tank built therein according to the present invention
• FIG. 3 is a plan view showing the examples of the settling apparatus.
• FIGS. 2 and 3 illustrate also unessential parts, for instance, laminar flow means 9, water current inducing means 10, and a barrier 11.
• the settling apparatus having the aeration tank therein includes: a main body 1 having an outer wall 12 and a base 13; an aeration tank 3 and a settling tank 4 divided by a partition 2, which is opened at a lower portion thereof, inside the main body 1 ; sewage inducing means 5 connected to the aeration tank 3; at least one air diffusing means 6 mounted in a lower portion of the aeration tank 3; and treated water discharging means 7 mounted on an upper portion of the settling tank 4.
• the sewage inducing means 5 may adapt a typical pipe, a perforated drain pipe having a plurality of holes formed on the wall surface of the pipe, or a pipe body constructed through a combination of the pipe and the perforated drain pipe may be adapted. Furthermore, as shown in FIG. 2, the sewage inducing means 5 can be mounted in such a way that it penetrates a side wall of the main body 1 or locked at the inner center of the main body 1.
• the treated water discharging means 7 may adapt a pipe, or a discharge pipeline and a wier having a projecting jaw, which are mounted on an upper face of the settling tank 4 as shown in FIG. 1. The wier may be mounted along an outer wall 12 or the partition 2 formed on the upper portion of the main body or at the center of the settling tank 4.
• FIG. 2(A) shows an example that an inclined wall 8 is not formed
• FIGS. 2(A) and 2(B) show examples that the aeration tank 3 is located at the center of the main body 1 and the settling tank 4 is located outside the aeration tank 3, and FIG. 2(C) shows an example that the aeration tank 3 and the settling tank 4 are respectively located on right and left sides of the main body 1.
• treating water (mixture of water and sludge), from which pollutants are removed by microorganisms, in the aeration tank 3 is introduced into the settling tank 4 through the lower portion of the partition 2.
• Sludge performs auto-flocculation in the lower portion of the settling part 4 to form a sludge layer to thereby improve the quality of the finally treated water since the sludge layer serves as a filtering layer when the treating water passes therethrough.
• the sludge is settled and the separated treating water is discharged through the treated water discharging means 7.
• the settled sludge is aerated and moved and circulated into the aeration tank 3 due to a flow of water, and hence, it provides a sludge return effect.
• microorganisms (sludge) settled and concentrated in the settling tank are returned to the aeration tank 3 by using separate devices and energies.
• Fbwever in the settling apparatus according to the present invention, the return of the microorganisms (sludge) is automatically achieved due to power of water current through an aeration action of the aeration tank 3.
• the main body 1 of the settling apparatus has a rectangular plane and includes the cuboid aeration tank 3 formed at the center thereof and the settling tank 4 formed at both sides of the aeration tank 3 by means of the two plate-type partitions 2.
• the main body 1 of the settling apparatus has a circular plane and includes the circular aeration tank 3 formed at the center of the main body 1 and the settling tank 4 surrounding the aeration tank 3 by means of the circular partition 2.
• the form of the aeration tank 3 shown in FIG. 3(A) and the form of the aeration tank 3 shown in FIG. 3(B) may be exchanged for each other.
• the partition 2 may be vertically movable.
• that the partition 2 is downwardly movable is indicated into a dotted line (the reference numeral 2' designates a partition indicated by the dotted line).
• a surface loading rate of the settling apparatus having the aeration tank therein reaches 5 mVm 2 • day, and it means that the settling apparatus can properly treat an increase of the inflow amount of the introduced sludge even though the inflow amount is increased up to seven times of the minimum treatment capacity.
• the settling apparatus having the aeration tank therein according to the present invention may be used alone according to conditions of the sewage to be treated, or used in combination with various water treatment devices, which were known before.
• FIG. 4 conceptually shows a sewage treatment system, in which the settling apparatus having the aeration tank therein according to the present invention, a settling reactor, and an additional aeration tank are combined with one another, wherein FIG. 4(A) is a conceptually sectional view of the sewage treatment system and FIG. 4(B) is a conceptually plan view of the sewage treatment system.
• FIG. 5 conceptually shows a nitrogen/phosphorus treatment system in which the settling apparatus having the aeration tank therein according to the present invention, a settling reactor, and an anaerobic tank are combined with one another.
• the settling apparatus can substitute for the cuboid (rectangular) settling tank or the circular settling tank, and can provide excellent economical efficiency since it can greatly improve the quality of water of the treating water through filtering and save equipment expenses and operating expenses.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Life Sciences & Earth Sciences (AREA)
• Biodiversity & Conservation Biology (AREA)
• Microbiology (AREA)
• Hydrology & Water Resources (AREA)
• Engineering & Computer Science (AREA)
• Environmental & Geological Engineering (AREA)
• Water Supply & Treatment (AREA)
• Organic Chemistry (AREA)
• Separation Of Suspended Particles By Flocculating Agents (AREA)
• Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
• Treatment Of Biological Wastes In General (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=40002749

Family Applications (1)

Country Status (2)

Cited By (4)

Citations (3)

Family Cites Families (1)

• 2008
  • 2008-05-09 KR KR20097020624A patent/KR20090130283A/ko not_active Application Discontinuation
  • 2008-05-09 WO PCT/KR2008/002630 patent/WO2008140229A2/en active Application Filing

Patent Citations (3)

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