KR20200016114A - Waste water advanced treatment system based on biological contact and circulation filtering - Google Patents

Abstract

The present invention relates to an advanced wastewater treatment system in a biological contact and recirculation method, which comprises: a reaction bath (10) for inducing the inflow of to-be-treated water; a reaction means (20) for dividing the reaction bath (10) into a weak aeration unit (21) and a strong aeration unit (22), and accommodating a filter material (26) inside the weak aeration unit (21); a circulation means (30) for inducing circulation of the to-be-treated water to a mixing dilution chamber (31) and a settling chamber (32) communicating with the reaction means (20); and a diffusion means (40) provided with a diffusing pipe (42) in the reaction means (20) and a circulation path of the to-be-treated water of the circulation means (30). Therefore, the advanced wastewater treatment system of the present invention is robust to a load change through advanced wastewater treatment of a biological contact and recirculation method, prevents degradation of treatment efficiency due to a decrease in water temperature in winter, and is simply operated and maintained to reduce expenses.

Description

Waste water advanced treatment system based on biological contact and circulation filtering

The present invention relates to an advanced wastewater treatment system, and more particularly, to an advanced wastewater treatment system for biological contact filtration for removing contaminants based on a batch reactor in a wastewater treatment facility.

Among the domestic wastewater treatment facilities, activated sludge method applied to sewage and sewage treatment including biological treatment has a large site area, and microbial activity decreases in case of load fluctuation such as long-term interruption of water to be treated and increase of inflow. The limitations in the removal of the solution are accompanied by many difficulties in terms of processing efficiency and maintenance. Therefore, high technology is required to measure the concentration of microorganisms in the reaction vessel, settleability, and confirm the formation of flocs. In particular, due to low water temperature in winter, the nitrification rate is lowered due to lowered microbial activity and insufficient removal of contaminants.

Most of the engineering methods applied to the high-altitude processing facilities in Korea, including the following Patent Publication No. 2017-0004019 and Patent Publication No. 041208, are divided into anaerobic tanks, anaerobic tanks, aerobic tanks, sedimentation tanks, etc. The initial investment is excessive because the configuration of various mechanical devices is complicated, and the required site is large.

In the case of the batch method to secure this, the required site can be reduced in one tank, but untreated water is generated in the aeration stop state during sedimentation and discharge, and it is fixed when the inlet and the outlet are separated by the longest to prevent it. Will be constrained by repaired copper routes.

On the other hand, the batch type of Korean Patent Publication No. 0942053 is resistant to load fluctuations such as inflow and concentration of raw water, by cultivating activated sludge supplied to the batch reactor and adjusting process conditions according to the inflow of raw water, and the sludge floc is hard. It is expected that the sedimentability will be improved and the wastewater treatment efficiency will be high and the quality of the effluent will be improved.

However, there is room for improvement in terms of reducing the time to recover from deterioration of water quality due to load fluctuations, improving the efficiency of preventing the activity of winter microorganisms, and lowering the dependence on high technical or professional personnel in operation.

Korean Laid-Open Patent Publication No. 2017-0004019 "Advanced Wastewater Treatment System" (published date: November 28, 2017) Korean Patent Publication No. 0441208 "Batch type wastewater treatment device using biofiltration technology and wastewater treatment method using the same" (published date: 2003.05.01.) Korean Patent Publication No. 0942053 "Advanced Wastewater Treatment Method and Treatment Apparatus by Batch Bioreactor" (Publication date: 2007.07.04.)

An object of the present invention for improving the conventional problems as described above, is to resist the load fluctuation due to the mixed dilution of the treated water is rapid recovery of deteriorated water quality, to secure a large amount of a variety of microorganisms in the reaction tank treatment efficiency by lowering the water temperature To prevent degradation, and to provide a highly biological wastewater treatment system of circulating filtration that can continuously and reliably treat the target water based on the simplicity of operation and maintenance.

In order to achieve the above object, the present invention provides a system for highly treating wastewater in a biocontact and circulating filtration method: a reaction tank for causing the inflow of the target water for treatment; A reaction means for dividing the reaction tank into a weak aeration portion and a strong aeration portion and accommodating a filter medium in the weak aeration portion; Circulation means for causing circulation of the target water to the mixed dilution chamber and the precipitation chamber in communication with the reaction means; And an air disperser having an air diffuser in the target water circulation path of the reaction means and the circulation means.

As a detailed configuration of the present invention, the reaction means 20 is characterized in that the weak aeration portion is formed as a partition wall in the center of the strong aeration portion, the media of the porous resin material is trapped in the weak aeration portion in the net.

As a detailed configuration of the present invention, the circulation means is characterized in that the mixed dilution chamber is formed on the lower side of the weak aeration portion, the precipitation chamber formed on the lower side of the strong aeration portion, a strong aeration portion, characterized in that to form a circulation path of the target water do.

As a detailed configuration of the present invention, the diffuser means includes a plurality of diffusers and nozzles on the mixed dilution chamber and the settling chamber, and the settling chamber is arranged to densely arrange the nozzles of the diffuser rather than the mixed dilution chamber.

As a modification of the present invention, the reactor further comprises a plurality of wing pieces protruding spirally on the bulkhead of the strong aeration unit, a floater for fluidly supporting a drainage device connected to an upstream end of the drain pipe.

As described above, according to the present invention, it is resistant to load fluctuation through the advanced treatment of wastewater in the biological contact circulation filtration method, prevents the treatment efficiency from lowering the winter water temperature, and reduces the overall costs by simple operation and maintenance. have.

1 is a schematic diagram illustrating a system according to the invention in a planar state;
2 is a schematic diagram illustrating a system terminated in accordance with the present invention.
3 is a schematic diagram illustrating main parts of a system according to the present invention;

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

The present invention proposes a system for highly treating wastewater by biocontact and circulation filtration. Wastewater is meant to include industrial wastewater and wastewater, as well as general treated water containing organic components including sewage. Living organisms are meant to include aerobic and anaerobic microorganisms to cause degradation of organic matter. The present invention is directed to, but not necessarily limited to, a system for highly treating subject water based on biocontact and circulating filtration.

According to the present invention, the reactor 10 is a structure that causes the inflow of the target water for treatment. The reactor 10 has a structure in which a reaction space is formed by connecting the bottom 11 and the outer wall 12, and an inner wall 13 is added to the inside to utilize a part of the reaction space as a raw water space. The source space serves as both a catchment tank and an anaerobic tank. Since the separate collection tank or agitator is excluded, the initial investment cost can be reduced by reducing the required site area.

At this time, a raw water pipe 15 and an input pipe 16 are installed in the raw water space of the reaction tank 10. The input tube 16 injects the target water into the reaction space of the reaction tank 10. Through the water pipe 15, the target water for daily treatment is introduced periodically.

In addition, according to the present invention, the reaction means 20 divides the reaction tank 10 into a weak aeration portion 21 and a strong aeration portion 22, a structure for accommodating the filter medium 26 in the weak aeration portion 21 Has The reaction means 20 is a structure in which the weak aeration portion 21 and the strong aeration portion 22 are arranged adjacent to each other in a set area in one reactor 10. The strong aeration portion 22 is an upstream region where a relatively strong water flow is formed, and the weak aeration portion 21 is a downstream region where the flow velocity and the water pressure are reduced. The filter medium 26 is formed of a sphere having a diameter of about 10 cm and is introduced into the weak aeration part 21 to cause biological filtration.

As a detailed configuration of the present invention, the reaction means 20 forms a weak aeration portion 21 as a partition wall 23 at the center of the strong aeration portion 22, and the media material 26 of the porous resin material is a weak aeration portion 21. It is characterized by being trapped in the network (25). 1 and 2 illustrate a state in which a strong aeration portion 22 formed in a substantially circular shape is disposed in a central region of the weak aeration portion 21 formed in a substantially rectangular shape. Of course, the shape of the weak aeration portion 21 and the strong aeration portion 22 may be formed somewhat differently depending on the situation of the site.

It is preferable that the area of the strong aeration part 22 is set to 50% or less than the area of the weak aeration part 21. The partition 23 forming the strong aerator 22 is installed at a height lower than that of the outer wall 12 or the inner wall 13. In FIG. 2, the upper setting water level indicated by "H" and the lower setting water level indicated by "L" are shown. The upper end of the input pipe 16 is installed at the water level indicated by "H", the partition 23 is installed at a height corresponding to the water level "L".

The weak aeration part 21 accommodates the countless media 26 in the area | region set by the upper net body 25 and the lower net body 25. As shown in FIG. The media 26 is formed of PE or PP material to maintain strength while having sufficient voids at the center and the outer circumferential surface. Organic decomposing microorganisms are implanted into the medium 26 in different kinds, and then randomly filled in the aeration part 21 to induce active breeding. By holding a large number of microorganisms in the filter medium 26, it is possible to treat a large amount of wastewater with a small capacity, and is advantageous for removing nitrogen even in winter. Aerobic microorganisms are activated at the surface portion of the filter medium 26, while oxygen-free and anaerobic regions are generated according to the consumption of oxygen toward the center. Sludge trapped in the center generates an almost anaerobic biofilm.

In this way, the weak aeration unit 21 reduces the construction cost by exerting the combined effects of aerobic tank, anaerobic tank and anaerobic tank into one.

At this time, although not shown, the filter medium 26 is preferably kept in a semi-fixed state in the weak aeration portion 21 of the reaction tank (10). If we restrict the movement of the media 26 to some extent by weaving wires or the like on the inner wall 13, the partition 23, and the mesh 25, the durability and the crack may be prevented by the collision.

In addition, according to the present invention, the circulation means 30 is a structure that causes the circulation of the target water to the mixed dilution chamber 31 and the precipitation chamber 32 in communication with the reaction means 20. The circulation means 30 serves to increase treatment efficiency by increasing the aeration time which is the main process in the batch reactor 10. The mixed dilution chamber 31 and the precipitation chamber 32 are installed in the region adjacent to the bottom 11 in the reaction tank 10. The downstream end of the input pipe 16 is led to the mixed dilution chamber 31. Downstream of the mixed dilution chamber 31 is connected to the precipitation chamber 32.

As a detailed configuration of the present invention, the circulation means 30 is a mixed dilution chamber 31 formed on the lower side of the weak aeration portion 21, the precipitation chamber 32 formed on the lower side of the strong aeration portion 22, a strong aeration portion (22), the aeration portion 21 forms a circulation path of the target water. The mixed dilution chamber 31 is formed at a constant height (depth), and the precipitation chamber 32 is formed deeper than the mixed dilution chamber 31. The lower portion of the sedimentation chamber 32 is less affected by the circulating water flow to generate sedimentation. The sedimentation chamber 32 is installed with a submersible pumping unit 35, the discharge pipe 33 for discharging the sludge to the upper side is connected.

Accordingly, the object water rises to the strong turbulent flow by the pumping unit 35 from the strong aeration section 22, and reaches the weak aeration section 21 in a relatively large area beyond the partition 23, and the flow rate is reduced. After passing through the filter medium 26 in a laminar flow state in the weak aeration unit 21, the liquid is circulated back to the strong aeration unit 22 after reaching the settling chamber 32 through the mixed dilution chamber 31.

In other words, the circulating water flow repeatedly collides with the media 26 in multiple directions, resulting in a change in dissolved oxygen concentration. The emergence of biologics due to changes in the water quality along with the diversification of the upper and lower biomass of the media 26 continues activation in the food chain process in which large microorganisms prey small microorganisms. Since large microorganisms are generated in the center of the mediator 26 to erode or self-extinguish the aerobic and anaerobic bacteria that have grown, the amount of surplus sludge discharged to the discharge pipe 33 is very small, resulting in power saving and ease of operation and maintenance. Indicates.

On the other hand, the transfer pipe 38 is branched in the middle of the discharge pipe 33, and the sludge is returned to the raw water space of the reactor 10 again. The discharge pipe 33 and the conveyance pipe 38 are provided with each opening / closing valve downstream of a branch point. The circulated object water and the sludge returned are diluted while passing through the raw water space and the mixed dilution chamber 31 in order to mitigate the impact on the microorganism of the weak aeration part 21. Even if the high concentration of target water flows in at a moment, mixing and dilution occurs twice, which shows strong characteristics against load fluctuations. Even without a separate stirring device, a smooth stirring (denitrification) process proceeds.

Further, according to the present invention, the diffuser means 40 is provided with a diffuser 42 in the target water circulation path of the reaction means 20 and the circulation means 30. The air diffuser 40 is provided with the diffuser 42 connected to the air diffuser 48 with a blower etc. adjacent to the bottom 11 of the reaction tank 10. As shown in FIG. The air supplied to the weak aeration part 21 and the strong aeration part 22 through the diffuser 42 induces the activation of aerobic microorganisms.

As a detailed configuration of the present invention, the diffuser means 40 includes a plurality of diffusers 42 and nozzles 44 on the mixed dilution chamber 31 and the settling chamber 32, and the settling chamber 32 is It is characterized in that the nozzle 44 of the diffuser 42 is arranged more densely than the mixing dilution chamber 31. 1 and 2 illustrate a state in which a plurality of diffusers 42 are radially connected to the mixing dilution chamber 31 and the settling chamber 32 via an air supply pipe 46. The nozzle 44 concentrated in the sedimentation chamber 32 strengthens the upward flow of water due to the strong aeration in the strong aeration portion 22 and causes the target water to spread widely above the partition 23 to the upper side of the weak aeration portion 21. The nozzle 44 disposed in the mixed dilution chamber 31 prevents the closing of the filter medium 26 in the weak aeration portion 21 and blocks the decay of the microbial group sedimented and captured.

The configuration of the reaction tank 10, the reaction means 20, the circulation means 30, the acid means 40 of the present invention is continuously and continuously performed mechanically, physically, and biologically self-cleaning, like a stream, by organically connecting with each other. do.

As a modification of the present invention, the reaction vessel 10 is a plurality of wing pieces 37 protruding in a spiral to the partition 23 of the aerator 22, the drainage device connected to the upstream end of the drain pipe 53 It is characterized in that it further comprises a floater (55) for fluidly supporting). The wing piece 37 and the floater 55 of this invention can selectively be equipped with at least one according to the site situation.

Referring to FIG. 3, it illustrates a state in which a plurality of wing pieces 37 spirally protrude on the inner surface of the partition 23 forming the strong aeration portion 22. A wing piece 37 having a set width and length is disposed on the spiral path to assist the aeration process and the spread to the weak aeration part 21 by adding a rotational force with turbulence of the object water.

2 and 3, the drainage 51 and the drain pipe 53 can be installed in a variable position in accordance with the situation of the site, thereby reducing the constraints of the repaired copper wire. When the drainage device 51 is installed in a floating state via the floater 55, the flexibility of process management is increased. The drain pipe 53 does not necessarily have to penetrate the outer wall 12 and may be at least partially replaced by a flexible hose. Continuous injection of the target water is possible so that there is no reduction of the inflow and the water level, there is no floating phenomenon of the floating material by the inflow water is always discharged only clear water to the drain pipe (53).

It is apparent to those skilled in the art that the present invention is not limited to the described embodiments and that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the claims of the present invention.

10: reactor 13: inner wall
15: raw water pipe 16: input pipe
20: reaction means 21: weak aeration
22: the river donation 23: bulkhead
25: Manche 26: Media
30: circulation means 31: mixed dilution room
32: settling chamber 33: discharge pipe
35: pumping unit 37: wing
38: return pipe 40: air diffuser
42: diffuser 44: nozzle
46: supply pipe 48: diffuser
51: drainage 53: drainage pipe
55: floater

Claims (5)

In a system for advanced treatment of wastewater by biocontact and circulation filtration:
A reaction tank 10 causing inflow of the target water for treatment;
A reaction means (20) for dividing the reaction tank (10) into a weak aeration portion (21) and a strong aeration portion (22) and accommodating a filter medium (26) in the weak aeration portion (21);
Circulation means 30 for causing circulation of the target water to the mixed dilution chamber 31 and the precipitation chamber 32 in communication with the reaction means 20; And
Bio-contact circulation filtration advanced wastewater treatment system, characterized in that it comprises a; air dispersing means 40 having a diffuser 42 in the target water circulation path of the reaction means 20 and the circulation means 30 . The method according to claim 1,
The reaction means 20 forms a weak aeration portion 21 as a partition wall 23 at the center of the strong aeration portion 22, and the media material 26 of the porous resin material is trapped in the weak aeration portion 21 by the net 25. Advanced wastewater treatment system of bio-contact circulation filtration characterized in that. The method according to claim 1,
The circulation means 30 is a mixed dilution chamber 31 formed at the lower side of the weak aeration portion 21, a precipitation chamber 32 formed at the lower side of the aeration aeration portion 22, a strong aeration portion 22, a weak aeration portion ( 21) Advanced wastewater treatment system of biological contact circulating filtration characterized in that to form a circulation path of the target water. The method according to claim 1,
The diffuser means 40 includes a plurality of diffusers 42 and nozzles 44 on the mixed dilution chamber 31 and the settling chamber 32, and the settling chamber 32 is less than the mixed dilution chamber 31. The wastewater advanced treatment system of the biological contact circulation filtration method, characterized in that the nozzle 44 of the diffuser 42 is arranged densely. The method according to claim 1,
The reactor 10 is a part for fluidly supporting a plurality of wing pieces 37 protruding spirally on the partition wall 23 of the aerator 22, the drainage device 51 connected to the upstream end of the drain pipe 53. Advanced wastewater treatment system of biological contact circulation filtration characterized in that it further comprises an organic (55).

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