KR100504239B1 - The bioreactor combined with aeration and settling - Google Patents

Abstract

The present invention relates to a biological reaction tank having a aeration process and a precipitation process, the sewage is introduced, the bioreaction tank (100) to purify and discharge the sewage by aeration (Aeration) by mixing the sewage and activated sludge from the inside, It is formed by partitioning in the interior of the bioreactor 100, the aeration zone 10 is installed and the aeration device 13 is installed to abandon by mixing the sewage and activated sludge, is formed partitioned in the interior of the bioreactor (100) The outflow weir 22 and the outflow water are provided in connection with the settling zone 20 for injecting the treated water abandoned in the aeration zone 10 to settle the sludge, and both side walls partitioning the settling zone 20. The discharge means consisting of (21) and the bioreactor 100 in the longitudinal direction to separate the aeration zone 10 and the sedimentation zone 20, the lower portion is opened to give up in the aeration zone (10) Treated water flows into the settling zone (20). Raised, consisting of a longitudinal bulkhead 30 consisting of an opening 31 for introducing the sludge settled in the settling zone 20 back to the aeration zone 10, it is possible to reduce the settling tank construction cost and operating costs, It is economical because it is possible to save operating expenses such as construction cost and pump operation power cost for the installation of sludge conveying facilities (sludge take-off facility, conveying pumping station, pump facility, piping facility, etc.) necessary for conveying the sludge settled in the final load tank. It can be profitable.

In addition, since the sludge settled in the settling zone 20 can be reused as active microorganisms in the total aeration zone 10, not only can the treatment efficiency be improved, but also the purification of the treated water quality can be greatly improved. .

In addition, it is a very useful invention that can reduce the capacity of the reaction tank and can facilitate the expansion of facilities and the improvement and the upgrading of existing facilities.

Description

Bioreactor combined with aeration and settling

The present invention relates to a biological reaction tank having both aeration process and sedimentation process, and more particularly, it is possible to perform the aeration process and the precipitation process in the same reaction vessel during sewage treatment, thereby reducing construction cost and operating cost, and increasing sewage treatment efficiency. It is invented to be.

In general, when wastewater such as domestic sewage, livestock wastewater, phosphorus classification, industrial wastewater, etc. flows into a river or lake, the pollution is intensified. In order to prevent the stream or lake from being contaminated by the waste water, the influent wastewater should be purified.

In the general wastewater purification, it is well known in the art that suitable anaerobic and aerobic microorganisms can be used together to purify the contaminants contained in the wastewater.

In general, the decomposition process using anaerobic microorganisms refers to a process in which organic matters of contaminants are converted to carbon dioxide and methane by microorganisms in an oxygen-free environment.

Part of the organic matter is decomposed through the anaerobic treatment process and then oxidized through the aerobic treatment process using the aerobic microorganism to completely decompose the pollutants.

And, by repeating the above process once or several times, it is possible to remove contaminants (particularly organic matter) contained in the waste water.

In particular, nitrogen (N) and phosphorus (P) contained in the waste water cause eutrophication or green algae of rivers and lakes, and in order to purify livestock waste water, industrial waste water and domestic waste water, nitrogen and phosphorus can be effectively removed. There is an urgent need for a way to do this, and efforts are underway to remove nitrogen and phosphorus.

In the past, attempts were made to remove nitrogen and phosphorus using chemical methods, but this causes secondary pollution and enormous costs, and recently, nitrogen and phosphorus have been removed by biological treatment methods using microorganisms. to be.

On the other hand, when agitated while supplying sufficient oxygen to sewage or wastewater, aerobic microorganisms suitable for the sewage multiply to form floc, and when stopped, it adsorbs the dissolved substances and suspended substances in sewage and settles together to become dark brown sludge. This is called active slag.

In addition, activated sludge has very strong adsorption, cohesion, and oxidizing power of organic matter, and has good separability due to sedimentation. By using the characteristics of such activated sludge, it is mixed with sewage and activated sludge, and aeration is carried out. The treatment method for removing organic matter is called activated sludge method, and the reaction tank that gives up mixed wastewater and activated sludge is called aeration tank.

And, the activated sludge method is provided with aeration tank and sedimentation basin, as shown in Figure 1, abandoned by mixing the sewage and activated sludge in the aeration tank and transported to the sedimentation basin, a part of the sludge sedimented by separating the sludge and the symbol water in the sedimentation basin To return to the aeration tank.

However, in the conventional activated sludge method, a separate aeration tank and a sedimentation basin are installed as described above, and a sewage transfer facility for transporting the sewage that is abandoned by mixing the activated sludge in the aeration tank to the sedimentation basin, and the sludge settled in the sedimentation basin into the aeration basin. Sludge conveying equipment (pump station, pumping equipment, piping equipment, electrical equipment, etc.) for conveying is essential.

That is, a problem arises in that the construction cost for constructing the sewage transport facility and the sludge transport facility and the standing operation cost for operating the facilities are required.

On the other hand, the substrate consumption rate of the biological treatment process that removes contaminants in the water using microorganisms, that is, the removal rate of the contaminants is proportional to the microbial concentration and the MLSS concentration. Therefore, increasing the MLSS concentration of the reactor increases the capacity of the treatment facility. It is possible to increase the processing efficiency without increasing.

In the conventional activated sludge method of maintaining the MLSS concentration in the reaction tank while conveying the sludge settled in the sedimentation basin, the relationship between the reaction tank MLSS concentration and Returned Activated Sludge (RAS) is proportional to the amount of returned sludge inflow. It can be seen that the concentration is increased.

Therefore, in order to increase the efficiency of sewage treatment, and to carry out high-level treatment such as nitrogen and phosphorus removal, the MLSS concentration should be increased. In order to increase the MLSS concentration, the amount of return sludge is needed. Since the capacity of the pump to be returned must be increased, there is a closed end that requires facility costs.

In addition, there is a limit to increase the amount of conveying sludge conveyed to the limit of the capacity of the sedimentation basin, there is a problem that is difficult to apply.

The purpose of the present invention is to integrate the conventional aeration tank and the sedimentation tank to omit the sewage transfer process and the conveying sludge conveying process, it is possible to reduce the construction cost, such as the sedimentation facility construction cost, sewage transportation equipment costs, sludge conveying equipment costs, required for operating these facilities It is to provide a bioreactor that combines aeration process and sedimentation process, which can save the cost.

Another object of the present invention is to increase the MLSS concentration of the aeration tank without increasing the amount of return sludge from the sedimentation tank, to maximize the sewage treatment efficiency, and the advanced treatment without the increase of the final sedimentation basin and sludge conveying facilities when the existing facility is advanced. It is to provide a bioreactor with a possible aeration process and a precipitation process.

The object of the present invention is the sewage is introduced, the bioreactor (100) to purify and discharge the sewage by aeration (Aeration) by mixing the sewage and activated sludge inside;

Aeration zone 10 is formed by partitioning the inside of the bioreactor 100, aeration device 13 is installed to abandon by mixing the sewage and activated sludge;

A sedimentation zone (20) formed by partitioning inside the bioreactor (100) and allowing the treated water abandoned in the aeration zone (10) to precipitate sludge;

Outflow means consisting of an outlet weir 22 and an outlet water passage 21 provided on both side walls partitioning the sedimentation zone 20;

The bioreactor 100 is partitioned in the longitudinal direction to separate the aeration zone 10 and the precipitation zone 20, and the lower portion thereof is opened so that the treated water abandoned in the aeration zone 10 flows into the precipitation zone 20. It is achieved by consisting of a longitudinal bulkhead 30 consisting of an opening 31 which rises and introduces sludge settled in the precipitation zone 20 back into the aeration zone 10.

That is, the aeration zone 10 and the precipitation zone 20 are partitioned by the longitudinal bulkhead 30 in the bioreactor 100 so that the aeration process and the settling process are performed in the same reaction tank. It is not required to install equipment (sludge take-out equipment, conveying pump device, plumbing equipment, etc.) for conveying the settled sludge at the facility, which can reduce facility construction cost and operation cost.

In addition, since the total amount of activated sludge settled in the precipitation zone 20 can be reused in the aeration zone 10, the MLSS concentration of the aeration zone 10 can be maintained high, thereby improving sewage treatment efficiency.

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention.

FIG. 2 is a plan view illustrating the bioreactor of the present invention in a plan view, wherein the bioreactor is partitioned into an anaerobic zone, aeration zone and a precipitation zone by a transverse bulkhead and a longitudinal bulkhead, and is a mixed means installed in the anoxic zone. It shows the zone mixer, the inflow channel and inflow weir installed along the outer wall of the abandonment zone, and the outflow weir and the outflow channel, which are symbolic outlets installed in two longitudinal rows in the sedimentation zone.

3 is a cross-sectional view taken along the line AA ′ of FIG. 2, showing a cross section of the oxygen-free zone.

4 is a cross-sectional view taken along the line B-B 'of Figure 2, showing the inlet channel, the inlet weir, the aeration zone with aeration device and the outflow passage, the sedimentation zone with a mixer for the outlet weir and aeration zone.

FIG. 5 is a cross-sectional view taken along the line CC ′ of FIG. 2, showing an oxygen free zone, a precipitation zone, and an internal circulation pump.

Hereinafter, as shown in FIG. 2, the bioreactor 100 of the present invention has a transverse bulkhead 41 installed therein, and forms an oxygen-free zone 40 on one side of the compartment in which sewage flows, and on the other side, The abandoned zone 10 and the precipitation zone 20 are formed by partitioning the directional partition 30.

In addition, the outer wall 14 of the aeration zone is provided with an inlet weir 12 and an inflow channel 11 connected to the anoxic zone 40 so that sewage flows into the aeration zone 10 evenly, and the transverse bulkhead An internal circulation pump 23 is installed at 41 to pump the circulating water from the precipitation zone 20 to the anoxic zone 40.

In addition, in the anoxic zone 40, an anoxic zone mixer 42 is provided to mix the nitric oxide contained in the circulated water introduced by the internal circulation pump 23 and the sewage introduced as shown in FIG. Is installed.

On the other hand, the longitudinal bulkhead 30 is installed in the longitudinal direction from the transverse bulkhead 41 to the inner wall of the bioreactor 100 to partition the aeration zone 10 and the precipitation zone 20, this longitudinal bulkhead The lower portion of the 30 is formed as an open opening 31 as shown in Figure 4 so that the sewage can be circulated to the aeration zone 10 and the precipitation zone (20).

In the aeration zone 10 partitioned by the longitudinal bulkhead 30, aeration device 13, which is an oxygen supply means, is installed, and the sludge that is settled in the precipitation zone 20 and flows through the opening 31 is introduced. Aeration zone mixer 15 is installed to mix well.

In addition, the sedimentation zone 20 partitioned by the longitudinal bulkhead 30 flows out to both side walls, that is, the inner surface of the longitudinal partition 30 partitioning the sedimentation zone outer wall 24 and the sedimentation zone 20. Outflow means consisting of the weir 22 and the outflow water passage 21 is provided, to discharge the supernatant water treated in this precipitation zone (20).

The sewage treatment process according to the present invention configured as described above is as follows.

The sewage once introduced into the anoxic zone 40 is mixed with the circulating water introduced from the precipitation zone 20 by the internal circulation pump 23 and the mixer 42 for the anoxic zone and nitrified in the circulation water. The denitrification reaction occurs by the liquid, and the denitrification reaction is promoted by the denitrification bacteria in the tank.

In addition, the reaction time in the anoxic zone 40 generally requires 1 to 1.5 hours, and the treated water treated in the anoxic zone 40 is introduced into the inlet passage 11 of the aeration zone 10 and is introduced therein. By overflowing the phosphorus inlet weir 12 is to be uniformly introduced to the shear surface of the aeration zone (10).

In addition, the sewage flowing into the aeration zone 10 is sewage and activated sludge, namely, by the action of the aeration zone mixer 15, which is a mixing means installed at the bottom of the aeration zone 10, and the aeration device 13, which is an oxygen supply means. In this case, the microorganisms are completely mixed and then aerated for a sufficient time. At this time, the contaminants in the water are removed by oxidation of the organic matter by the microorganisms and microbial cell synthesis.

The sewage treated in the aeration zone 10 is introduced into the sedimentation zone 20 by the opening 31 of the longitudinal bulkhead 30, and the sewage introduced due to no mixing of water flow in the sedimentation zone 20. As it rises at a very slow rate, the sludge settles and the symbol water rises, resulting in solid-liquid separation.

At this time, the settled sludge is sent to the aeration zone 10 by the aeration zone mixer 15 and reused as an active microorganism, and the symbol water flows over the outflow weir 22 and flows out evenly to discharge the flow path 21. Flows into the outflow zone, and the circulating water in the precipitation zone 20 is introduced into the oxygen-free zone 40 by the internal circulation pump 23 installed in the transverse bulkhead 41.

In other words, if the sewage is introduced into the bioreactor 100, the above process is repeated and can be purified to clean the waste water.

According to the configuration of the present invention described above, in the activated sludge process for purifying wastewater by using activated sludge (microorganism), the aeration process and the precipitation process can be combined in the same bioreactor.

That is, to separate the aeration tank and the sludge from the treated water, which is removed by abandoning the organic matter in the water, and clean water is discharged into the supernatant water, the sludge is settled, some of which are discarded and some are returned to the aeration tank. The sedimentation tank is not set aside, and the inside of the bioreactor is partitioned with a longitudinal bulkhead so that the aeration process and the precipitation process can be performed in the same reactor.

Therefore, it is possible to reduce the construction cost and operating cost of the sedimentation tank, and to install the sludge conveying facilities (sludge extracting facility, conveying pump station, pump facility, plumbing facility, etc.) necessary for conveying the sludge settled in the final load tank, pumps It is possible to save driving expenses such as driving power costs, which can give economic benefits.

In addition, because the sludge settled in the sedimentation zone can be reused as active microorganisms in the total aeration zone, not only can the treatment efficiency be improved, but also the purification of the treated water quality can be greatly improved.

In addition, it is a very useful invention that can reduce the capacity of the reaction tank and can facilitate the expansion of facilities and the improvement and the upgrading of existing facilities.

1 is a view showing a process diagram of a conventional activated sludge sewage treatment method.

Figure 2 is a plan view showing the bioreactor of the present invention in a planar state.

3 is a cross-sectional view taken along the line AA ′ of FIG. 2.

4 is a cross-sectional view taken along the line BB ′ of FIG. 2.

5 is a cross-sectional view taken along the line CC ′ of FIG. 2.

* Description of the major symbols in the drawings *

10-Abandonment Zone 11-Influent Channel

12-Inlet weir 13-Aeration device

14-Outer Wall Outer 15-Outer Zone Mixer

20-sedimentation zone 21-runoff

22-Outflow weir 23-Internal circulation pump

24-Outer Wall 30-Longitudinal Bulkhead

31-Opening 40-Anaerobic Zone

41-transverse bulkhead 42-mixer for anaerobic zones

100-bioreactor

Claims (3)

A bioreactor 100 for purifying and discharging sewage by introducing sewage into the aeration by mixing sewage and activated sludge inside; Aeration zone 10 is formed by partitioning the inside of the bioreactor 100, aeration device 13 is installed to abandon by mixing the sewage and activated sludge; A sedimentation zone (20) formed by partitioning inside the bioreactor (100) and allowing the treated water abandoned in the aeration zone (10) to precipitate sludge; Outflow means consisting of an outlet weir 22 and an outlet water passage 21 provided on both side walls partitioning the sedimentation zone 20; The bioreactor 100 is partitioned in the longitudinal direction to separate the aeration zone 10 and the precipitation zone 20, and the lower portion thereof is opened so that the treated water abandoned in the aeration zone 10 flows into the precipitation zone 20. Bioreactor having an aeration process and a precipitation process, characterized by consisting of a longitudinal bulkhead 30 consisting of an opening part 31 which rises and introduces sludge settled in the precipitation zone 20 back into the aeration zone 10. . The method of claim 1, characterized in that the aeration zone mixer 15 is installed in the aeration zone 10 so that the sludge settled in the settling zone 20 is introduced through the opening 31 is mixed well. Bioreactor combined with aeration process and precipitation process. The bioreactor 100 has a transverse bulkhead 41 installed therein and forms an oxygen-free zone 40 on one side of which is divided into the sewage inflow, and the longitudinal bulkhead 30 on the other side. The aeration zone 10 and the precipitation zone 20 are formed, and the inlet weir 12 and the inflow channel 11 connected to the anoxic zone 40 are formed on the outer wall 14 of the aeration zone. Sewage is evenly introduced into the aeration zone 10, and an inner circulation pump 23 is installed in the transverse bulkhead 41 to circulate the circulating water from the precipitation zone 20 to the anoxic zone 40. Biological reaction tank having an aeration process and a precipitation process, characterized in that the pressure feeding.