KR20050115124A - Advanced wastewater treatment apparatus with using intraclarifier reactor and intra circulation - Google Patents

Abstract

The present invention is a sewage altitude treatment process in which a sedimentation basin built-in reaction tank is applied in which a sedimentation basin is installed inside a reaction tank in a high-treatment process of a total denitrification series such as MLE, AO, A ₂ O, and the like, and reaction and solid-liquid separation are performed in one structure. Regarding the apparatus, a sedimentation basin is installed inside the reactor, and the configuration of the apparatus is simple, and the sludge blanket is stably maintained so that the solid-liquid separation can be performed smoothly. Rectification means is provided to rectify and flow into the sedimentation basin and the sludge flows smoothly into the reaction tank, the sedimentation efficiency can be stabilized by installing a plurality of sludge blanket wall in the upper part of the rectification means in the sedimentation basin, the internal circulation facility It is economical and device configuration because the internal circulation and sludge conveyance of the reaction solution are performed in parallel It will provide a simple and highly advantageous in terms of processor utilization site

Description

Advanced Wastewater Treatment Apparatus with using Intraclarifier Reactor and Intra Circulation}

The present invention relates to an advanced wastewater treatment apparatus, and replaces the aerobic and sedimentation tanks with sedimentation built-in reaction tanks as final reaction tanks in the advanced treatment process of total denitrification system by internal circulation, eliminating sludge collectors and return pumps, and by internal circulation facilities. The present invention relates to an advanced treatment apparatus capable of carrying sludge conveyance in parallel.

In order to increase the sewerage rate with limited resources, it is necessary to develop an economical and efficient wastewater treatment system. However, MLE (Modified Ludzack & Ettinger Process, hereinafter referred to as "MLE"), A ₂ O (Anaerobic Anoxic Oxic Process, hereinafter referred to as "A ₂ O"), VIP, UCT, Bardenpho, Johannesburg Process In the advanced treatment process of the total denitrification system, the internal circulation of the reaction solution and the sludge conveyance were required together, which required a large amount of facility and operating costs.

Referring to the conventional A ₂ O process as an example, first, in addition to the biological reactors 102, 102a and 102b, as shown in Figure 1, the sedimentation pond 103, the sludge conveying facility 105, 105a and the internal circulation facility (107, 107a) Was needed.

The sludge conveying facility is a facility for conveying sludge from the sedimentation basin 103 to the anaerobic reaction tank 102a and includes a conveying pump 105 and a conveying pipe 105a.

The biological reaction tank in the A ₂ O process, which is one of the representative processes of the total denitrification method using the inflowed organic matter for the denitrification in relation to nitrogen and phosphorus removal, is an anaerobic reaction tank 102a in which phosphorus release reaction is performed, and an oxygen-free reaction tank in which denitrification reaction is performed. (B) composed of an aerobic reactor (102) in which nitrification and organic decomposition occur, and internal circulation facilities are required in addition to the sedimentation basin and sludge conveying facility, so that many driving parts are difficult and operation management is difficult, and the configuration of the device is complicated to apply to a small scale. Do.

In addition, in the conventional total denitrification-based advanced treatment process and activated sludge process, as shown in FIG. 1, the sedimentation pond 103 by a structure separate from the biological reactor 102 was required. The sedimentation basin 103 is a solid-liquid separation process for separating solids and clean treated water, and is provided with a sludge collector 106 and a driving device 106a. The sludge conveying facility conveys the sludge from the sedimentation basin 103 to the reaction tank 102a. It consists of the conveyance pump 105 and the conveyance piping 105a.

As such, the sewage treatment process, in which the sedimentation basin is separated from the reaction tank, requires a lot of additional facilities, and thus requires a large amount of facility costs and power costs, and the reaction vessel structure and the sedimentation basin structure are separately installed.

In order to solve this problem, various types of built-in sedimentation basins have been developed, but a boat-type sedimentation basin (Boat Clarifier) developed by United Industries of the United States, and a sedimentation basin embedded in the aeration tank of the sewage treatment apparatus invented and patented by the applicant (patent patent) 112614), settling oxidized bulb (patent No. 244328) and inclined plate immersion oxidized bulb (patent 225972), and Burns & McDonell (Burns & McDonell) developed in the United States, These built-in sedimentation basin has a problem that the application to the oxidation sphere forming the circulating water is limited.

It is economical and the site utilization efficiency can be increased by eliminating the power for the installation and operation of the sludge conveying facility in the non-circulating channel-type complete mixing reactor that is resistant to load fluctuations and toxic substances and complete mixing. Even under mixed conditions, the inside of the sedimentation basin is required to develop and disseminate the sedimentation basin built-in reactor and the advanced treatment apparatus using the sedimentation basin which can maintain the sedimentation efficiency in a steady state.

The present invention has been made to solve the above problems, the sedimentation efficiency is stable and excellent, the sludge collector and the sludge conveying facility is omitted, the resistance to load fluctuations and toxic substances, the sedimentation storage built-in type fully mixed type reaction tank and the inside excellent It is intended to provide an advanced treatment apparatus by circulation.

In order to achieve the above object, in the present invention, the application of the built-in sedimentation basin, which was limited to the oxidizing sphere, is installed in the reactor of the non-circulating channel type and the complete mixing reactor type, and the sludge flows in and out of the built-in sedimentation basin. Rectification means is provided to reduce the effects of turbulence caused by aeration and agitation.The sludge blanket wall divides the inside of the sedimentation basin into a plurality of lattice blocks so that the sludge blanket can be stabilized in the sedimentation basin. Aeration apparatus was installed in the reaction tank so as to circulate the liquid and to stir the reaction liquid.

In order to prevent sludge deposition at the bottom of the sedimentation basin, the sedimentation basin is divided into several small sedimentation basins and sludge circulation and water flow between the sedimentation basin and the sedimentation basin, between the wall of the sedimentation basin and the basin and the bottom of the basin and the basin bottom This is made smoothly, and the stirring force is also applied to the center of the lower bottom of the sedimentation basin to prevent sludge deposition, but the aeration device should be disposed so that bubbles and strong turbulence do not directly flow into the lower inlet of the sedimentation basin.

Rectification is installed in the lower portion of the sedimentation basin for the purpose of reducing the effect on the sludge blanket by the reaction liquid flows into the sedimentation basin from the reaction tank and the sludge sludge flows smoothly into the reactor, and the vortex of the reactor and the water flow flowing into the sedimentation basin The means may be constituted by an inclined flat plate, a triangular beam, a plate bent in a ∧ shape, and a ∧-shaped plate having a plurality of holes formed at its vertex.

In addition, the rectifying means may be configured by installing a plurality of static mixers at certain intervals to allow the solids contained in the reaction liquid to rise to the sedimentation basin to agglomerate so that the sludge is aggregated to favor the sedimentation.

Particularly, in the present invention, when the sedimentation basin is composed of one tank having a large water surface area, the sludge blanket is not stable and is swelled or partially swelled and ruptured, and the solid matter is separated from the sludge blanket and is generated in the sedimentation basin. In order to improve the problem, in the space in which the sludge blanket is formed between the symbolic water outlet of the sedimentation basin and the lower rectifying means, a sludge blanket wall composed of a plurality of lattice vertical walls is installed to provide two spaces in which the sludge blanket is formed. This is divided into a settling block that is a plurality of lattice space.

Therefore, the vortex caused by the water flow is weakened by the sludge blanket wall, so it is hydraulically stable and prevents channeling phenomenon inside the sedimentation basin.In addition, the sludge blanket is swung and partially formed in the narrow space inside the sedimentation block. The problem of swelling, bursting or rising is reduced, and the sludge blanket can be stabilized, so that the collection efficiency of the particles can be improved.

If the flatness of the sedimentation basin is large, the inflow and agitation force of the circulating water cannot be applied to the bottom of the reactor in the central part of the sedimentation basin, so sludge is deposited and floats or rises to the inner surface of the sedimentation basin, thereby reducing treatment efficiency.

Therefore, in order to solve this problem, in the present invention, when the sedimentation basin area, that is, the sedimentation basin capacity is large, the sedimentation basin is divided into a plurality of narrow small sedimentation basins, and between the sedimentation basin and the sedimentation basin and between the sedimentation basin and the reactor wall, the appropriate agitation force and the rising water flow. Or proper agitation force and horizontal water flow is formed to prevent sludge deposition at the bottom of the sedimentation basin reactor.

The aeration device may be a combination of an acid pipe or a diffuser and an agitator, a pump ejector and a combination of a horizontal blower and an air blower, capable of simultaneously supplying air to the reaction tank and forming an air stream. It is available.

In addition, the sedimentation built-in reactor according to the present invention can simplify the facilities and improve the economics of all types of water treatment process consisting of the reaction tank and the sedimentation basin, including conventional standard activated sludge process, MLE or AO process and physicochemical flocculation sedimentation process. .

Integrated settler when having not therefore be solved this by applicable in the AO, MLE process as but adding concentrated functions required in the process in which the concentrated sludge requirements, as an example A ₂ O process to the sludge thickening function following same.

In order to realize the conventional A ₂ O process with simultaneous removal of biological nitrogen phosphorus, anaerobic and anoxic reaction tanks operated under constant aerobic agitation conditions from inflow of sewage are sequentially formed, and the sedimentation built-in reactor according to the present invention is sequentially constructed. In order to compensate for the lack of sludge enrichment in the built-in settler, the reaction solution is internally circulated from the sedimentation built-in reaction tank to the anaerobic reaction tank and the anoxic reaction tank. The solid-liquid separated filtrate was introduced into the anoxic reaction tank to perform denitrification of the nitrate nitrogen, and the solid-liquid separated high concentration sludge was introduced into the anaerobic reactor to perform the phosphorus release reaction under anaerobic conditions.

Here, the stirring means installed in the anaerobic reaction tank is a pump ejector, the solid-liquid separation means is composed of a gravity sedimentation basin, sludge precipitated in the lower portion of the gravity sedimentation basin is sucked through the secondary fluid suction port of the pump ejector to the anaerobic reaction tank By the transfer to, the pump ejector was improved to save the facility cost, operating cost and installation space by carrying out the sludge transfer and agitation of the anaerobic reactor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2, 2A and 2B are a plan view and a sectional view of an embodiment of a sedimentation basin built-in reaction tank in which a sedimentation basin is incorporated in a reaction tank.

In FIG. 2, in order to equalize the flow of water in the built-in sedimentation basin (2) embedded in the reaction tank (1) and to stabilize the sludge blanket to increase solids collection efficiency, the built-in sedimentation basin is divided into a plurality of lattice settling blocks (22). The sludge blanket wall 21 is provided. In addition, when the surface area of the sedimentation basin is large, a plurality of small sedimentation basins are installed, and the aeration device shows an embodiment using a combination device of a horizontal flow type stirrer 31, an diffuser 32, and a blower 33. .

2A is a cross-sectional view taken along the line A-A of FIG.

The sludge circulation means composed of the horizontal flow type agitator 31 according to this embodiment is installed in the space between the sedimentation basin and the sedimentation basin on the side of the sedimentation basin 2 and the space between the sedimentation basin and the reactor wall, and the water flow by the agitator is lower than the sedimentation basin. It is installed slightly higher than the rectifying means at the bottom of the sedimentation basin so as not to have a direct and strong influence on the rectifying means.

The reaction liquid is moved toward the reaction vessel wall on the opposite side of the sedimentation basin by the stirring force and horizontal water flow formed by the stirrer, and in the process, the mixing force also affects the lower portion of the sedimentation basin. A water stream is drawn out, and the horizontal water flow at the bottom side is converted into an upward flow by the reaction tank wall on the opposite side, and a horizontal water flow is formed from the upper part of the reaction tank toward the upper side of the sedimentation basin, and descends near the reaction tank wall at the sedimentation basin side. The down stream is formed to illustrate that the entire reaction tank can be stirred.

As such, the reaction tank is agitated by the rotating water flow and the stirring force rotating the entire reaction tank, and the sludge is drawn out and mixed in the lower part of the sedimentation basin to maintain and operate the reaction tank in the form of a completely mixed reactor. The stirrer may be installed to form a stream of water upward, or a centrifugal stirrer may be used. In addition, the stirrer rotating at a low speed can be maintained in the sedimentation basin sedimentation efficiency even if installed in the sedimentation basin.

As the aeration device of the sedimentation built-in reactor, the diffuser 31 and the blower 32 may be installed together with the stirrer 31, or a known device such as an diffuser, an underwater bubbler, a pump ejector, or the like may be used.

FIG. 2B is a cross-sectional view taken along line B-B in FIG.

The upper portion of the sedimentation basin (2) is provided with a symbol water collecting means 23 consisting of a perforated pipe or V-groove overflow wear, the effluent flowing out of the plurality of collecting means is discharged through the symbol water outflow passage 24, the In the lower part, a rectifying means of which a turbulent solid suspension mixture in the reaction tank is converted into a rectified state favorable for sedimentation so that the reaction liquid inlet and the sediment sludge outlet are installed at regular intervals. 26) is provided, the at least one sludge blanket wall 21 is installed vertically in the settling space between the symbol water collecting means and the rectifying means a plurality of two or more planes in which the sludge blanket 25 is formed in the sedimentation basin The built-in sedimentation basin configured to be divided into two sedimentation blocks 22 is illustrated.

The rectifying means 26 is installed in the lower portion of the built-in sedimentation basin using a plurality of triangular cross-section beams, a plurality of flat plate installed to be inclined, a flat plate having a plurality of holes formed near the upper vertex, or as a sedimentation basin It is possible to use a plurality of static mixers (not shown) capable of stirring so that the solids contained in the incoming reaction solution collide with each other.

3 is a conceptual diagram of a first embodiment of the advanced treatment system using the sedimentation built-in reactor and the internal circulation according to the present invention.

This embodiment applies the advanced treatment process for nitrogen removal by AO (Anoxic Oxic Process) or MLE process (Modified Ludzack & Ettinger Process) consisting of anoxic reaction tank, aerobic reaction tank and settling basin. Will be improved.

From the inflow of sewage, an anoxic reactor (11) operating under constant aerobic agitation conditions and the sedimentation built-in reaction tank (1) according to the present invention operated in an aerobic condition are sequentially connected to constitute a device, from the sedimentation built-in reaction tank The reaction solution is internally circulated to the oxygen-free reaction tank. Therefore, in the reaction tank 1 in which the sedimentation basin is embedded, organic matter oxidation and nitrification are performed under aerobic conditions, and in the anoxic reaction tank, denitrification reaction of nitrogen oxide contained in the internal circulating water is performed. The sludge of the anoxic reactor is maintained by internal circulation from the sedimentation built-in reactor.

4 is a conceptual diagram of a second embodiment of an advanced treatment apparatus using the sedimentation built-in reactor according to the present invention.

This embodiment is an embodiment in which the sedimentation built-in reactor according to the present invention is applied to a conventional A ₂ O process (Anaerobic Anoxic Oxic Process) as a process equipped with biological nitrogen phosphorus removal.

Anaerobic reactor 12 and anoxic reactor 11 and a sedimentation built-in reactor according to Figs. 2 to 2b of the present invention sequentially operated from the inflow of sewage, and the anaerobic reaction from the sedimentation built-in reactor The reaction solution is internally circulated to the reaction tank and the anaerobic reaction tank, and the liquid-liquid separation means 14 is provided in the transfer line of the reaction solution so that the filtrate separated into the liquid-liquid flows into the anoxic reaction tank and the solid-liquid separated sludge flows into the anaerobic reaction tank. to be.

Therefore, in the anaerobic reaction tank in which phosphorus is released from the sludge, the sludge concentration can be maintained by the solid-liquid separation means to improve the phosphorus emission efficiency. In addition, the solid-liquid separation means may use a conventional solid-liquid separation means such as gravity sedimentation basin, centrifugal concentrator, hydrocyclone and the like.

Here, the stirring means installed in the anaerobic reactor may use a rotary stirrer, but in the case of the rotary stirrer, a separate pump facility for drawing and transporting sludge from the anaerobic reactor is required. Therefore, in the present invention, the agitation means of the anaerobic reaction tank is an ejector 35 and the solid-liquid separation means is a gravity sedimentation basin, and the sludge deposited on the gravity sedimentation basin is sucked through the secondary fluid inlet of the ejector and ejected from the anaerobic reaction tank. By the agitation, the sludge is transported by the pump 34 and the ejector 35 together with the agitation of the anaerobic reactor, so the configuration of the device is simple and economical.

According to the present invention, the built-in sedimentation basin is installed inside the aerobic reactor to reduce the structure, omit the sludge collector and the conveying facility, and apply the sludge conveyance by the internal circulation facility by applying the denitrification-based advanced treatment method. By providing the device, the utilization of the site is high, the cost of constructing the structure is reduced, and the sludge collector and the sludge conveying facility are omitted, so that the high-cost processing device in terms of facility cost and maintenance cost can be realized.

1 is a schematic configuration diagram of a conventional A ₂ O process by total denitrification;

2 is a plan view and a cross-sectional view of an embodiment of a sedimentation built-in reactor according to the present invention;

FIG. 2A is a cross-sectional view taken along the line “A-A” of FIG. 2;

FIG. 2B is a cross-sectional view taken along the line “B-B” of FIG. 2;

3 is a schematic configuration diagram of a first embodiment of an advanced treatment apparatus using a sedimentation built-in reactor and internal circulation according to the present invention;

4 is a schematic configuration diagram of a second embodiment of an advanced treatment apparatus using a sedimentation built-in reactor and internal circulation according to the present invention.

※ Explanation of code about main part of drawing ※

1: Reactor 2: Built-in sedimentation basin

11: anoxic reaction tank 12: anaerobic reaction tank

14: solid-liquid separation means 21: sludge blanket wall

22: sedimentation block 23: symbolic water collecting means

24: symbolic water outflow passage 25: sludge blanket

26: rectification means 31: agitator

32: diffuser 33: blower

34: pump 35: ejector

Claims (5)

At least one anoxic reaction tank for denitrification, at least one aerobic reactor for aerobic decomposition and nitrification of organic matter, and a high-treatment method for the total denitrification system comprising a combination of a settling basin, a sludge conveying facility and an internal circulation facility, and In the advanced processing apparatus is composed of the addition of one or more anaerobic reactor to the phosphorus release reaction, Skip the installation of the final aerobic reactor at the sedimentation basin and pre-sedimentation stage, and replace it with one or more built-in sedimentation basin and sludge built-in reactor equipped with aeration device that prevents sludge deposition and mixes the reaction liquid smoothly. And a sludge conveyance and internal circulation of the reaction solution from the sedimentation built-in reaction tank to the anaerobic reaction tank and the anoxic reaction tank. The method of claim 1, wherein the advanced treatment process is composed of an oxygen-free reaction tank and the sedimentation built-in reaction tank, the reaction liquid is internally circulated from the sedimentation built-in reaction tank to the anoxic reaction tank, the advanced by the internal circulation and the sedimentation built-in reaction tank. Processing unit. The process of claim 1, wherein the advanced treatment process comprises an anaerobic reaction tank, an anoxic reaction tank, and a sedimentation built-in reaction tank in sequence, and returns sludge from the sedimentation built-in reaction tank to the anaerobic reaction tank and the anoxic reaction tank and circulates the reaction solution. The liquid transport line is provided with a solid-liquid separation means, and the filtrate separated from the solid-liquid flows into the anoxic reaction tank and the sludge, which is the solid-liquid separated solids, flows into the anaerobic reaction tank and the advanced treatment apparatus by internal circulation. . The method of claim 1, wherein the upper part of the embedded sedimentation battery is provided with a symbolic water collecting means consisting of an underwater orifice tube or V-groove wallware, and the reaction liquid inlet of the embedded sedimentation battery is a solid-state suspension mixture in the reaction tank is rectified. Rectification means is provided with a plurality of ∧-shaped cross-section plate to be introduced into the sedimentation basin and the sludge is discharged into the reaction tank spaced at regular intervals to form a plurality of slit-type openings, the symbol water collecting means and One or more sludge blanket walls are installed in the sedimentation space between the rectifying means so that the internal space of the sedimentation basin in which the sludge blanket is formed is divided into two or more sediment blocks, and the aeration device includes a pump ejector, an acid pipe, and an underwater device. Advanced treatment plant by sedimentation built-in reactor and internal circulation, characterized in that the abandoned phase Chi. The anaerobic reactor according to claim 3, wherein the agitation means installed in the anaerobic reactor is a pump ejector and the solid-liquid separation means is a gravity sedimentation basin, and the sludge deposited on the gravity sedimentation basin is sucked through the secondary fluid suction port of the pump ejector. The apparatus for treating sludge built-in reaction tanks and internal circulation, wherein the sludge is transported and the anaerobic reaction tank is agitated by the pump ejector.