KR100879788B1 - Apparatus for treatment of wastewater capable of removing pollutant produced by cso efficiently, method, and system thereof - Google Patents

Abstract

A wastewater treatment apparatus for efficiently removing contaminants due to first flush stormwater, a wastewater treatment method using the same, and a wastewater treatment system comprising the wastewater treatment apparatus are provided to reduce the operating cost by controlling the flow rate of wastewater flowing in a biological filter basin, thereby treating the wastewater to an extent observing the target water quality only. A wastewater treatment apparatus comprises at least one filter unit, a biological filter basin(69), and a flow distribution tank(61). The filter unit filters suspended solids contained in wastewater using a floating filter media. The biological filter basin removes dissolved organic matters contained in effluent flown out from the filter unit. The flow distribution tank controls the flow rate of wastewater supplied to the filter unit. The flow distribution tank includes a coagulation part(63) and an inflow pipe(65). The coagulation part increases the size of solids contained in the wastewater using a coagulant and air. The inflow pipe supplies effluent supplied from the coagulation part to the filter unit.

Description

Apparatus for treatment of wastewater capable of removing pollutant produced by CSO efficiently, method, and system approximately}

The present invention relates to a wastewater treatment apparatus, a method, and a system, and more particularly, to a wastewater treatment apparatus, a method, and a system capable of efficiently removing contaminants generated by initial rainwater.

In general, Combined Sewer Overflow (CSO) due to initial rainfall is greater than the amount of pollutants caused by sewage treatment plant effluent. For example, in urban areas, when rainfall occurs, pollutants accumulated on roads and pollutants accumulated in conduits are flown into sewage treatment plants at once due to increased flow rates due to rainfall.

In addition, the concentration of pollutants flowing into the sewage treatment plant during rainfall is 150 mg / L BOD (Suspended Solid) 250 mg / L and it is known that the concentration of pollutants is higher than that of sewage.

In order to reduce the amount of pollutants caused by the initial rainwater, the Korean sewage facility standard regulates the discharge of BOD and SS by less than 40mg / L.In order to improve the water quality of rivers and lakes, There is a need for a method for more efficiently removing pollutants generated by the process.

Accordingly, the technical problem to be achieved by the present invention is to provide a wastewater treatment apparatus, a method, and a system capable of efficiently removing contaminants generated by initial rainwater.

Waste water treatment apparatus for solving the above technical problem, at least one filtering means for filtering the suspended solids contained in the waste water by using the floating media; And it may include a biological filter for removing the dissolved organic matter contained in the effluent flowing out of the filtering means.

The wastewater treatment apparatus may further include a flow rate distribution tank configured to adjust an inflow amount of the wastewater supplied to the at least one filtration means.

The flow rate distribution tank, the flocculating unit for increasing the size of the solids contained in the waste water by using a flocculant and air; And it may include an inlet pipe for supplying the outflow water flowing from the aggregation unit to the at least one filtering means through the inlet pipe.

The inlet pipe may discharge the sludge discharged from the at least one filtration means to a backwash water discharge pipe.

The inlet pipe, the inlet valve for controlling the outflow water flowing from the aggregation unit is supplied to the at least one filtering means; And a backwash valve configured to control the sludge discharged from the at least one filtration means to be supplied to a backwash water discharge pipe.

The wastewater treatment apparatus may further include a water level variable partition wall formed between the at least one filtration means and the biofilter to control the flow rate of the at least one filtration means into the biofilter.

The wastewater treatment apparatus may be a primary sedimentation basin of a wastewater treatment system for removing contaminants included in initial rainwater.

Wastewater treatment method for solving the technical problem, the step of filtering the suspended solids contained in the wastewater using the floating filter; And it may include the step of removing the dissolved organic matter contained in the waste water.

The wastewater treatment method includes a separation step of separating solids contained in the wastewater by using a flocculant and air before filtering the suspended solids; And it may further comprise the step of outflowing the outflow water from the solids separated by the separation step through the inlet pipe.

The inlet pipe may also be used as a sludge pipe for discharging the sludge discharged by the step of filtering the suspended solids to the backwash water discharge pipe.

Waste water treatment system for achieving the technical problem, the primary sedimentation means for removing the suspended matter and dissolved organic matter contained in the incoming waste water; A biological reaction tank for decomposing and removing organic matter by reacting the effluent water from the primary precipitation means with microorganisms; And secondary sedimentation means connected to biological reaction means to separate sludge generated from the biological reaction and the treated water, wherein the primary sedimentation means uses the flotation media to collect the suspended solids contained in the wastewater. At least one filtering means for filtering; And it may include a biofilter for removing the dissolved organic matter contained in the effluent flowing out of the at least one filtering means.

The primary precipitation means may further include a flow rate distribution tank for adjusting the flow rate of the waste water supplied to the at least one filtration means.

The flow rate distribution tank, the flocculating unit for increasing the size of the solids contained in the waste water by using a flocculant and air; And it may include an inlet pipe for supplying the outflow water flowing from the aggregation unit to the at least one filtering means through the inlet pipe.

The inlet pipe may be used as a sludge pipe for discharging the sludge discharged from the at least one filtration means to the backwash water discharge pipe.

The inlet pipe, the inlet valve for controlling the outflow water flowing from the aggregation unit is supplied to the at least one filtering means; And a backwash valve configured to control the sludge discharged from the at least one filtration means to be supplied to a backwash water discharge pipe.

The primary precipitation means may further include a water level variable partition wall formed between the at least one filtering means and the biofilter to control the flow rate of the at least one filtering means into the biofilter.

Therefore, the wastewater treatment apparatus, the method, and the system according to the present invention have an effect of efficiently removing contaminants caused by initial rainwater.

In addition, the wastewater treatment apparatus, the method, and the system according to the present invention can quickly remove solids and efficiently oxidize dissolved organic substances by using flotation media and biofilters in existing sedimentation basins for initial water treatment. It works.

In addition, the wastewater treatment apparatus, the method, and the system according to the present invention according to the present invention have an effect of stably obtaining the treated water even when the flow rate and load are changed by using the variable water level barrier wall, which is introduced into the biofilter. By adjusting the flow rate, the amount of treatment can be reduced to meet the target water quality, thereby reducing the operating cost.

In addition, the wastewater treatment apparatus, method, and system according to the present invention according to the present invention reduce the sewage treatment installation area and cost by using the inlet pipe for the purpose of discharging the backwash water including sludge as well as the outflow water. It can be effective.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only the embodiments are to make the disclosure of the present invention complete, and those skilled in the art to which the present invention pertains. It is provided to fully inform the scope of the invention, and the invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

1 is a block diagram schematically showing a primary sedimentation means of the sewage treatment system according to a comparative example of the present invention. Referring to FIG. 1, the primary sedimentation means 10 for removing solids of wastewater introduced into a sewage treatment system includes a sludge hopper unit 12, a rectifying plate 14, and a sludge collection unit 15. It may include.

The sludge hopper part 12 collects and stores the solids contained in the sewage in the form of sludge, and the rectifying plate 14 separates the solids generated for the sludge hopper 12 and sludges outflow water from which the solids are separated. The collection unit 15 transmits.

In addition, the sludge hopper unit 12 may flow out the sludge generated from the solids and the sludge collection unit 15 using a sludge drawing pump.

The sludge collection unit 15 transfers the sludge contained in the effluent flowing out through the rectifying plate 14 to the sludge hopper unit 12 using the sludge collector 16, and discharges the treated water from which the sludge has been removed. The overflow weir 18 may be used to transfer to the outside (eg bioreactor).

However, according to the primary sedimentation means 10 according to the comparative example of the present invention, when the flocculant is added to generate a precipitate, the area and cost of the apparatus are high, and thus, if there is no necessary site in the sewage treatment plant, the installation may not be possible. And, there may be a problem that can not remove the dissolved organic matter contained in the water.

Figure 2 is a block diagram schematically showing a primary sedimentation means of the sewage treatment system according to another comparative example of the present invention. Referring to FIG. 1, the primary settling means 10 for removing solids of wastewater introduced into a sewage treatment system includes a flow distribution tank 22, a filtration unit 24, and a sludge hopper unit 30. ).

The flow distribution tank 22 includes at least one flow distribution portion 22-1 to 22-4, and each of the at least one flow distribution portion 22-1 to 22-4 respectively corresponds to incoming wastewater. To the filtering means (for example, the first to fourth filtering means 24-1 to 24-4).

The filtration unit 24 includes at least one filtration means (first to fourth filtration means 24-1 to 24-4), and the at least one filtration means (first to fourth filtration means 24-24). 1 to 24-4) each may filter the suspended solids contained in the wastewater using the flotation filter.

The filter unit 24 transmits the suspended solids filtered using the backwashing pipe 26 to the sludge hopper unit 30, and the treated water filtered out of the suspended solids is transferred to the outside through an overflow weir 28. (E.g., bioreactor).

The sludge hopper unit 30 may transfer the backwash water including the sludge transferred from the filtration unit 24 to the outside using a sludge drawing pump.

However, according to the primary sedimentation means 20 according to the comparative example of the present invention, in order to transport the waste water to the flow distribution tank 22, a water channel should be installed in the horizontal direction, which may require a lot of space and cost. Problems may arise in that the dissolved organics in the water cannot be removed.

In addition, according to the primary sedimentation means 20 according to the comparative example of the present invention, the strength of each of the partition wall (문제점) can cause a problem that can not withstand the load of the influent can be applied to the field in reality Can be difficult.

Figure 3 shows a block diagram of a sewage treatment system according to an embodiment of the present invention, Figure 4 schematically shows the primary sedimentation means of FIG. 3 and 4, the sewage treatment system 50 includes a primary sedimentation means (or primary sedimentation basin 60), a bioreactor 80, and a secondary sedimentation means (or secondary sedimentation basin 90). It may include. The primary sedimentation means 60 can remove only the suspended substances contained in the waste water introduced.

The primary settling means 60 may comprise a flow rate distribution tank 61, a floating member filtration 67, a biofilter 69, and an overflow weir 71. The flow rate distribution tank 61 may adjust the amount of wastewater introduced into the floating member filtration unit 67.

In addition, the flow rate distribution tank 61 may increase the size of the solids contained in the waste water by using the flocculant and the air, and may transmit the treated water in which the solids are grown to the floating member filtration unit 67.

The flow rate distribution tank 61 may include an agglomeration part 63 and an inflow pipe 65. The agglomeration part 63 may grow the size of the solids contained in the waste water by using a flocculant and air, and the inflow pipe 65 is an outflow water (for example, the solids are grown) from the agglomeration part 63. Through the treated water) to the floating member filtration unit 67.

In more detail, the inlet pipe 65 is configured to filter outflow water (eg, treated water in which solids are grown) flowing from the agglomeration part 63 (eg, first to third filtering means 67-1). To 67-3).

Compared to the sewage treatment system 20 of FIG. 2, the sewage treatment system 50 according to the embodiment of the present invention has a flow rate distribution tank 61 and a flow rate distribution tank 20 of FIG. Located in Therefore, the installation work of the flow distribution tank 61 is easy, and the sewage treatment system 50 has a structurally safe effect.

At this time, the inlet pipe 65 may also be used for the purpose (ie, sludge pipe) for discharging the sludge discharged from the floating member filtration unit 67 to the backwash water discharge pipe.

More specifically, the inlet pipe 65 may discharge the sludge discharged from at least one filtering means (eg, the first to third filtering means 67-1 to 67-3) to the backwash water discharge pipe.

That is, the primary sedimentation means 60 according to the embodiment of the present invention uses the inlet pipe 65 for the purpose of discharging the backwash water including sludge as well as the outflow water, thereby reducing the installation area and cost of sewage treatment. This can have an effect.

The inlet pipe 65 may include an inlet valve V1 and a backwash valve V3. The inflow valve (V1) can be controlled so that the outflow water flowing from the flocculation unit 63 is supplied to the floating member filtering portion 67, the backwash valve (V3) is discharged from the floating member filtering portion (67) The backwashing water containing sludge may be controlled to be supplied to the backwashing water discharge pipe.

For example, if the loss head increases due to sludge stacking of the floating member filtering part 67 as the filtration proceeds, the inlet valve V1 is closed and the inlet pipe 65 is opened to the floating member filtering part 67. The stacked sludge may be discharged through the backwash water discharge pipe.

At this time, each of the inlet valve (V1) and the backwash valve (V3) can be automatically opened and closed by a separate valve controller (not shown), it can be opened and closed manually.

On the other hand, the flow distribution tank 61, the user can be installed a pedestrian management walking path 66 for the overall maintenance of the flow distribution tank 61 and the wastewater treatment system 50.

The floating member filtration unit 67 may include at least one filtration means (first to fourth filtration means 67-1 to 67-4), and is included in the effluent introduced through the inflow pipe 65. Suspended solids can be filtered.

The first filtering means 67-1 may filter the suspended solids contained in the outflow water introduced through the inlet pipe 65 using the floating member, and the filtered suspended matter may be reversed through the inlet pipe 65. It can be transferred to the waste water discharge pipe. In addition, the first filtering means 67-1 may transfer the treated water treated with the suspended solids to the second filtering means 67-2.

The second filtration means 67-2 may filter the suspended solids contained in the effluent introduced through the inflow pipe 65 and / or the first filtration means 67-1 by using a floating member, and filtering The suspended solids may be transferred to the backwash water discharge pipe through the inlet pipe 65. In addition, the second filtering means 67-2 may transfer the treated water treated with the suspended solids to the third filtering means 67-3.

The third filtration means 67-3 may filter the suspended solids contained in the effluent introduced through the inflow pipe 65 and / or the second filtration means 67-2 by using the floating member. The suspended solids may be transferred to the backwash water discharge pipe through the inlet pipe 65. In addition, the third filtering means 67-2 may transmit the treated water treated with the suspended solids to the biofilter 69.

The biofilter 69 may remove the dissolved organic matter contained in the effluent flowing out of the floating member filtration unit 67, and may remove the ammonia nitrogen contained in the effluent.

At this time, the dissolved organic matter and / or ammonia nitrogen to be removed to the biofilter 69 may be transferred to the backwash water discharge pipe through the inlet pipe (65).

Biofilter 69 may be composed of a multi-layered biofilter. The biofilter of the multilayer filter biofiltration process is a composition as disclosed in Korean Patent No. 10-0591541-0000 (the lower filter layer composed of a fixed bed filter having a larger specific gravity than water and a portion having a smaller specific gravity and a larger size than the fixed bed filter Multi-layer media floating floating wastewater treatment device having an upper media layer composed of a common sense media) can be employed.

The biofilter 69 may be provided with a facility (not shown) for injecting air to separate the dissolved organic matter adhering to the biofilter 69 and may be injected with air.

Alternatively, the biofilter 69 is provided with a flocculant injection facility (not shown) for agglomerating solids and phosphorus contained in the effluent flowing out of the floating member filtration unit 67 and a facility (not shown) for air injection to provide a flocculant. And air may be injected.

At this time, the filter medium of the biological filter paper (69) is preferably 5 to 15mm in diameter because the increase in inflow flow rate can be very fast depending on the initial rainfall, but is not limited thereto. In addition, the shape of the media may be a variety of spheres, squares, and molds, but may be preferably in the form of a sphere in order to minimize the head of the loss, the uniformity factor is preferably 1.5 or less.

On the other hand, between the floating member filtration unit 67 and the biological filter paper 69 may be formed of a variable water level barrier wall (73 of Figure 5).

5 and 6 are views schematically showing the primary precipitation means according to another embodiment of the present invention, respectively, the primary precipitation means 60 'of FIGS. 5 and 6 is the primary precipitation means 60' of FIG. In addition, the water level variable partition wall (73 of FIG. 4) is further included between the floating member filtering portion 67 and the biofilter paper (69).

The variable water level partition wall 73 (FIG. 4) may control the flow rate of the floating member filtration unit 67 into the biofilter 69. For example, FIG. 5 is a view showing the operation of the variable water level barrier 73 when the amount of wastewater introduced is relatively small. When the head of water is increased and the flow rate flowing into the biofilter 69 decreases, the remaining flow rate is automatically determined. The water level may be discharged via the discharge weir 71 beyond the variable barrier wall 73.

In addition, Figure 6 is a view showing the operation of the water level variable barrier wall 73 when the amount of wastewater introduced is relatively large, and increases the height of the water level variable barrier wall 73 when the flow rate to be treated in the biological filter paper 69 increases. The water treatment load of the filter paper 69 can be reduced.

In addition, the water level variable partition wall 73 is the inflow rate into the biofilter 69 when the water quality of the discharged water discharged through the discharge weir (71) is less than the water quality standard (for example, BOD is more than 40mg / L) When the quality of the discharged water is lower than the water quality standard (eg, when the BOD is 30 mg / L or less), the inflow amount of the biofilter 69 may be reduced.

That is, the primary sedimentation means (60 ') according to the embodiment of the present invention has the effect of reducing the operating cost by treating only the flow rate to be treated in the biological filter paper 69 to comply with the treated discharge water quality standards.

Referring again to FIGS. 3 and 4, the overflow weir 71 may transfer the treated water treated by the biofilter 69 to the bioreactor 80.

The bioreactor 80 may decompose and remove organic matter by reacting the effluent from the primary precipitation means 60 with microorganisms.

More specifically, the biological reaction tank 80 may serve to decompose and remove organic matter by reacting the effluent water from the primary precipitation means 60 with the microorganisms. The biological reaction tank 80 may be composed of an anaerobic tank, an anoxic tank, an aerobic tank, a reaction tank, and combinations thereof, and may include a plurality of anoxic tanks, an aerobic tank, and the like, in consideration of decomposition efficiency of organic matter, residence time, and the like.

The secondary precipitation means 90 may be connected to the biological reactor 80 to separate the sludge and the treated water produced by the biological reaction. At this time, the sludge separated by the secondary precipitation means 90 may be re-transmitted to the biological reaction tank (80).

7 is a flow chart of the sewage treatment method according to an embodiment of the present invention. 3, 4, and 7, the flow distribution tank 61 increases the size of the solids contained in the wastewater using the flocculant and the air (S10), and the effluent from which the solids are grown by the step S10 is It flows out to the floating member filtering part 67 through the inflow pipe 65 (S12).

The floating member filtering unit 67 removes suspended matter from the treated water by the step S12 using the floating filter (S14), and the biofilter 69 removes the dissolved organic matter contained in the treated water by the step S14. Remove (S16).

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a block diagram schematically showing a primary sedimentation means of the sewage treatment system according to a comparative example of the present invention.

Figure 2 is a block diagram schematically showing a primary sedimentation means of the sewage treatment system according to a comparative example of the present invention.

Figure 3 shows a block diagram of a sewage treatment system according to an embodiment of the present invention.

4 schematically shows the primary precipitation means of FIG.

5 and 6 schematically show the primary precipitation means according to another embodiment of the present invention, respectively.

7 is a flow chart of the sewage treatment method according to an embodiment of the present invention.

Claims (16)

At least one filtering means for filtering the suspended solids contained in the wastewater by using the floating media; And Biofiltration paper to remove the dissolved organic matter contained in the effluent flowing out of the filtering means; And It includes a flow rate distribution tank for adjusting the flow rate of the waste water supplied to the at least one filtering means, wherein the flow rate distribution tank, Aggregation unit for growing the size of the solid contained in the waste water using a flocculant and air; And Wastewater treatment apparatus comprising an inlet pipe for supplying the outflow water flowing from the agglomeration unit to the at least one filtering means through the inlet pipe. delete delete According to claim 1, The inlet pipe, Wastewater treatment device for discharging the sludge discharged from the at least one filtering means to the backwash water discharge pipe. The method of claim 4, wherein the inlet pipe, An inlet valve controlling the outflow water flowing from the agglomeration part to be supplied to the at least one filtering means; And And a backwash valve configured to control the sludge discharged from the at least one filtration means to be supplied to a backwash water discharge pipe. The wastewater treatment apparatus of claim 1, And a water level variable barrier formed between the at least one filtering means and the biofilter to control the flow rate of the at least one filtering means into the biofilter. The wastewater treatment apparatus of claim 1, Wastewater treatment system, which is the primary sedimentation point of the wastewater treatment system for removing contaminants included in initial rainwater. In the wastewater treatment method for removing contaminants contained in the wastewater by the initial rainwater in the primary sedimentation basin of the wastewater treatment system, An agglomeration step of growing the size of the solids contained in the wastewater using a flocculant and air; Distilling outflow water containing the solids grown by the flocculation step through an inlet pipe; Filtering the suspended solids contained in the effluent using a flotation filter; And Wastewater treatment method comprising the step of removing the dissolved organic matter contained in the effluent. delete The method of claim 8, wherein the inlet pipe, Wastewater treatment method also used as a sludge pipe for discharging the sludge discharged by the step of filtering the suspended solids to the backwash water discharge pipe. Primary precipitation means for removing the suspended solids and dissolved organic matter contained in the incoming waste water; A biological reaction tank for decomposing and removing organic matter by reacting the effluent water from the primary precipitation means with microorganisms; And In connection with the biological reaction means includes a secondary precipitation means for separating the sludge and the treated water produced by the biological reaction, the primary precipitation means, At least one filtering means for filtering the suspended solids contained in the wastewater by using a floating filter; And Biofilters for removing the dissolved organic matter contained in the effluent flowing out of the at least one filtering means, The primary precipitation means, It includes a flow rate distribution tank for adjusting the flow rate of the waste water supplied to the at least one filtering means, wherein the flow rate distribution tank, Aggregation unit for growing the size of the solid contained in the waste water using a flocculant and air; And Waste water treatment system comprising an inlet pipe for supplying the outflow water flowing from the agglomeration unit to the at least one filtering means through the inlet pipe. delete delete The method of claim 11, wherein the inlet pipe, Wastewater treatment system also used as a sludge pipe for discharging the sludge discharged from the at least one filtering means to the backwash water discharge pipe. The method of claim 14, wherein the inlet pipe, An inlet valve controlling the outflow water flowing from the agglomeration part to be supplied to the at least one filtering means; And And a backwash valve configured to control the sludge discharged from the at least one filtration means to be supplied to a backwash water discharge pipe. The method of claim 11, wherein the primary precipitation means, And a water level variable partition wall formed between the at least one filtering means and the biofilter to control the flow rate of the at least one filtering means into the biofilter.

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