KR101288298B1 - A rainwater and overflow water treatment apparatus using surplus sludge - Google Patents

Abstract

PURPOSE: An initial rainwater and overflowing water treatment device using surplus sludge is provided to maximize removal efficiency of floating matters and organic matters by utilizing surplus sludge for a coagulation nucleus forming a huge floc. CONSTITUTION: An initial rainwater and overflowing water treatment device (10) using surplus sludge comprises a rapid mixing tank (11), slow mixing tanks (13,15), an inclined plate precipitation facility (18), and a surplus sludge supply facility. The inclined plate precipitation facility includes a settling tank, an inclined plate unit (34), a scrapper (33), and a stirrer (37) and separates the sludge from inflow water. The surplus sludge supply facility supplies the surplus sludge for inside return in a bio-react process to the inflow water on an upstream side of the rapid mixing tank.

Description

Technical Field [0001] The present invention relates to an apparatus for treating an overflow water and an overflow water treatment apparatus using surplus sludge,

The present invention relates to an initial stormwater treatment apparatus and an overflow water treatment apparatus for reducing the suspended matter and organic matter load in inflow water such as initial precipitation and high concentration overflow occurring during initial rainfall, It is removed by the slope sedimentation facility installed to increase the surface area due to the presence of suspended material. Since the overflow water afterward contains suspended matter and organic material with low gravity type sedimentation efficiency, it is returned to the inside of the bioreactor in the sewage treatment plant The present invention relates to an apparatus for removing initial surplus and overflow water using surplus sludge that maximizes the efficiency of removing suspended solids and organic matter by utilizing the excess sludge utilized as an agglomeration nucleus for forming a giant fl ow through a reaction with a flocculant will be.

In order to improve facilities for rainwater disposal, we plan to implement measures such as improvement of sewage treatment facilities, improvement of water quality standards, and appropriate management of rainfall by 2015 by injecting about 130 billion won into the nation's public sewage treatment plant have. Especially, coliform bacteria concentration in summer rivers is more than five times higher than in winter, and initial pollution concentrations (BOD, SS, etc.) are increased by three to four times more than usual during rainfall.

However, most of the public sewage treatment plants are equipped with the capacity to handle additional rainwater at the time of rainfall in addition to the usual facility capacity. However, in the inflow water source, the inflow of sewage is blocked in advance, It is being discharged into rivers as it is, and there is concern about the deterioration of river quality in the whole country. Therefore, it is important to establish a safe and clean treatment system of rainwater through the improvement of inappropriate facilities.

In practice, the sewage treatment plant is designed to handle 3Q, which is three times the maximum amount of water Q introduced into the combined sewage treatment plant during rainfall. However, since only the maximum sewage amount can be treated at the time of the sewage treatment facility, And is by-passed from part to part, which is a very serious water pollutant source.

Therefore, in order to improve the water quality of the discharged stream, it is necessary to increase the efficiency of the sedimentation basin, to improve the treatment efficiency of the initial storm and the overflow water, and to improve the disinfection facility and treatment efficiency.

1. Korean Patent Registration No. 0842880 (June 25, 2008) 2. Korean Patent Registration No. 0958295 (2010.05.10) 3. Korean Patent Registration No. 0649180 (2006.11.16) 4. Korean Patent Registration No. 0779513 (November 20, 2007)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art and it is an object of the present invention to provide a high efficiency sloping sedimentation facility capable of increasing existing sedimentation efficiency and utilizing a narrow site area as much as possible, The present invention is to provide an initial stormwater and sewage water treatment apparatus using surplus sludge which satisfies the water quality standards of the effluent water without any trouble in operation and can handle the inflow sewage increased due to rainfall in a stable manner.

It is another object of the present invention to provide a method of forming a flock having a high specific gravity through an initial precipitation and an overflowing water by reacting with an aggregating agent and treating the flock and floating material through gravity- Which is transported in a biological treatment process to a part of excess sludge which is used in the biological treatment process to promote the formation of flocs with the flocculant and to increase the treatment efficiency in the slope plate sedimentation facility .

In order to solve the object of the present invention, there is provided an initial stormwater and sewage treatment apparatus using surplus sludge, comprising: a rapid mixing tank in which influent water reacts with a flocculant; A slow mixing tank installed downstream of the rapid mixing tank and mixing the influent water and the polymer reacted in the rapid mixing tank; An inclined plate sedimentation facility installed at a downstream end of the full mixing tank to separate sludge from the inflow water; And an excess sludge feeder for feeding the excess sludge for internal transportation of the bioreactor disposed downstream of the slope plate settling apparatus to the upstream side influent of the rapid mixing tank,

The inclination plate settling apparatus includes:

A sludge discharge pipe connected to the sludge discharging pipe to discharge the concentrated sludge; A swash plate unit including a plurality of swash plates installed inside the settling tank and inclined at a predetermined angle, left and right connecting plates connecting the plurality of swash plates, and outlet pipes coupled to upper ends of the plurality of swash plates; And a scrapper for collecting sludge falling down to the bottom of the settling tank in the direction of the sludge discharge pipe and an agitator for rotating the scrapers,

And the left and right connection plates are formed with side openings to allow the inflow water to flow into the side surfaces between the plurality of swash plates.

The slow mixing tank is composed of a first full-speed mixing tank in which a polymer is supplied by a polymer injecting facility, a second full-speed mixing tank in which the polymer is installed at a downstream end of the first full mixing tank and in which a polymer having a large specific gravity is formed, And a buffering tank installed downstream of the second full-speed mixing tank for temporarily storing the influent water overflowed in the second full-speed mixing tank.

The side opening may have a plurality of openings to distribute the flow rate between the swash plate and the swash plate.

In the initial excellent stormwater and overflow water treatment apparatus according to the present invention, the flocculant and the organic matter removal efficiency can be obtained by the sloping sedimentation facility which increases the surface area load of the sedimentation tank after forming the flocs by the coagulation and mixing reaction In addition, a stable treatment efficiency can be secured by reusing a part of surplus sludge for internal transportation of a biological treatment process in an existing sewage treatment plant and using it as a condensation nucleus for increasing the treatment efficiency of fine suspended substances in abundance and overflow.

In addition, it is possible to secure a high processing speed, and there is no separate backwashing facility and no backwashing time, so that maintenance and other costs can be reduced, and a compact device requiring no additional external agglomeration auxiliary equipment for separate flocculation efficiency.

In addition, since the swash plate settling apparatus as a component of the present invention has a structure in which raw water flows into the side surface to rise, the mixed space of the sludge and the inflow water, which is a disadvantage of the conventional swash plate apparatus, is eliminated and high processing performance can be obtained, It has the advantage of increasing processing capacity by more than 25% compared to sedimentation facilities.

FIG. 1 is a block diagram for explaining a water treatment system including an initial stormwater and sewage water treatment apparatus using excess sludge according to an embodiment of the present invention.
2 is a view showing an apparatus for treating initial surplus and surplus water using surplus sludge according to an embodiment of the present invention.
Fig. 3 is a perspective view of the swash plate unit shown in Fig. 2 with the outflow pipe removed. Fig.
Fig. 4 is a side view for explaining the flow of treated water and sludge in the swash plate unit shown in Fig. 3; Fig.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail to the concrete inventive concept.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

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

FIG. 1 is a block diagram for explaining a water treatment system 100 including an initial stormwater and overflow treatment apparatus 10 using surplus sludge according to an embodiment of the present invention.

Referring to FIG. 1, the initial stormwater and the overflow water are introduced into the initial stormwater and overflow water treatment apparatus 10 of the present invention after passing through the screen tub 110 and removing large floats or contaminants. The treated water having passed through the initial stormwater and sewage treatment plant 10 is transferred to a known biological treatment process and then discharged. The known biological treatment process includes a primary settling tank 120, an aeration tank 130, a secondary settling tank 140 and an ultraviolet sterilization tank 150.

In the biological treatment process, surplus sludge is transported to the previous stage of the aeration tank 130 in the second settling tank (140). This surplus sludge is supplied to the shear inflow water of the initial stormwater treatment apparatus 10 by the surplus sludge supply facility 20. In this embodiment, the surplus sludge supply facility 20 means a sludge pipe 43 and a sludge pump (not shown). The sludge pipe 43 is connected to the inflow water pipe 41 (see Fig. 2).

2 is a view showing an initial stormwater and overflow treatment apparatus 10 using surplus sludge according to an embodiment of the present invention, and Fig. 3 is a view showing an outflow pipe 39 in the swash plate unit 34 shown in Fig. FIG. 4 is a view for explaining the flow of treated water and sludge in the swash plate unit 34 shown in FIG. 3; FIG.

2, an initial stormwater / overflow water treatment apparatus 10 using an excess sludge according to the present embodiment includes a rapid mixing tank 11, a primary and a secondary full mixing tank 13 and 15, 17, a swash plate settling facility 18, and a storage tank 45 for temporarily storing treated water.

The rapid mixing tank 11 is provided with a stirrer 25 so that the coagulant can react with the inflow water in a state where the coagulant injected by the coagulant feeder 21 reacts with the inflow water.

In the first full-speed mixing tank 13, a polymer is added to the reacted influent water overflowing from the rapid mixing tank 11 by the polymer injection equipment 23 to promote the formation of flocs. An agitator (27) is installed so that the polymer is agitated to mix well with the influent and forms a flock.

The second full-speed mixing tank 15 is formed of a flock having a large specific gravity while the influent water flows along with the flock formed in the first full-speed mixing tank 13 and continues to be stirred by the stirrer 29.

The buffering tank 17 is a place for temporarily storing inflow water formed with flocks before entering the swash plate settling facility 18 and inflow water flows into the swash plate settling facility 18 through the openings 31.

2 to 4, the swash plate settling apparatus 18 includes a settling tank 19, a swash plate unit 34 provided inside the settling tank 19, and a stirrer 37 for stirring the scrapers 33 do.

The sedimentation tank 19 has an opening 31 formed at one side thereof to allow inflow water to flow from the buffering tank 17 and a sludge discharge pipe 47 to discharge the concentrated sludge to the bottom.

3 and 4, the swash plate unit 34 is provided with a plurality of swash plates 35 installed in the settling tank 19 and inclined at an angle of 55 degrees with respect to the vertical line, and each of the swash plates 35 Are spaced apart from each other at regular intervals, and both side surfaces are connected by the left and right connection plates 57 and 59. An outflow pipe 39 is connected to the upper end of the plurality of swash plates 35 to discharge the treated water separated from the sludge. A plurality of side openings 61, 63, 71, and 73 are formed in the left and right connection plates 57 and 59 that connect the left and right sides of the swash plate 35. Two side openings are formed between each of the swash plate 35 and the swash plate 35 in each of the openings 61, 63, 71, and 73 to distribute the flow rate of the inflow water evenly. Therefore, the inflow water flows into the lower side surface between the swash plate 35 and the swash plate 35 through the side openings 61, 63, 71, and 73 and is moved upward.

The upper end and the lower end between the swash plate 35 and the swash plate 35 are opened to form the lower gap 55 and the upper gap 53. The separated sludge is discharged to the lower gap 55 and the treated water flows to the upper gap 53 and is discharged to the storage tank 45 through the discharge pipe 39. The scrapper 33 installed in the lower part of the sedimentation tank 19 is rotated by the agitator 37 to collect the sludge falling from the swash plate unit 34 at the lower end of the sedimentation tank and discharged through the concentrated sludge line 47.

Hereinafter, the process of treating the initial stormwater and the sewer water by the initial stormwater / sewage treatment device 10 using the surplus sludge according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

 The initial stormwater and the overflow water that have passed through the screen tank 110 are flown into the rapid mixing tank 11 at a constant flow rate by a natural flow and a transfer pump (not shown) (arrow a in FIG. 2).

1 and 2, the pipeline 41 through which the initial storm flows is connected to the surplus sludge supply pipe 43 and the surplus sludge supply facility 20, and is connected to the second sedimentation tank 140 of the general biological treatment tank And a part of the generated excess sludge is supplied to the incoming initial storm (arrow b in Fig. 2). The reason why the excess sludge is supplied to the influent in the previous stage of the rapid mixing tank 11 is to increase the removal efficiency of the small and low specific gravity contained in the influent water. In other words, the surplus sludge for internal transportation of the existing bioreactor process is supplied to the initial storm inflow side to serve as a condensation nucleus, and the weight of the sludge passing through the rapid mixing tank 11 and the first and second slow mixing tank 13, Facilitating the separation of suspended solids with a low specific gravity by facilitating the large flocs. That is, the surplus sludge supplied increases the sedimentation efficiency of the storm water and the overflow water by acting as a condensation nucleus in the flocculation reaction, and allows the suspended suspended material in the inflow water to be easily flocculated, Can be maximized. This is in contrast to the conventional artificial addition of a weighted flocculant, which is different from a system requiring a separate weighted flocculant and a device for separating suspended solids. Further, the additional addition method of the prior art is continuously required to be costly due to loss, and maintenance is difficult due to complicated facility structure.

The rapid mixing tank (11) and the first full-speed mixing tank (13) are divided into intermediate separation walls and flowed by the overflow. The coagulant is injected into the rapid mixing tank 11 by the coagulant feeder 21 and stirred by the stirrer 25 so that the suspended substances and the organic substances and the coagulant in the influent water are easily reacted by the rapid turbulence.

The reacted influent is then passed over to the primary and secondary full admixture vessels 13,15 and mixed with the polymer added by the polymer injection facility 23 and the agitators 27,29, And formation of a specific-gravity flock progresses.

The inflow water formed with the fl ow is flowed into the buffer plate 17 and then flows into the swash plate settling facility 18.

3 and 4, the inflow water flowing into the lower portion of the swash plate 35 is scattered toward both sides of the swash plate 35 while crossing the width of the swash plate 35 while hitting the swash plate 35, and flows in an upward flow in the laminar flow state 63, 71, and 73 formed at the lower portions of the left and right connection plates 57 and 59 at the portions between the swash plate 35 and the swash plate 35 (arrow f in FIG. 4). The solid matter (sludge) 79 is precipitated by the swash plate 35 inclined at an angle of 55 degrees (arrow g in FIG. 4) and the clean supernatant (treated water) separated is subjected to the shearing process of the existing sewage treatment plant (Biological treatment process). 4, the arrow f indicates the direction of movement of the treated water, and the arrow g indicates the direction of movement of the sludge 79 separated from the treated water. At this time, the outflow pipe 39 is disposed directly above each swash plate 35 and is distributed equally among the swash plates 35, and the solids are collected along the slope to the lower part, that is, the lower part of the settling tank 19.

This compact structure of the present invention not only reduces the installation site to less than half the existing treatment facility, but also facilitates the increase and maintenance of the treatment efficiency.

The apparatus 10 for treating initial surplus and residual water using the surplus sludge of the present invention has the following features.

In the case of the existing slope sedimentation facility, influent water flows into the lower part of the swash plate and flows upwardly along the swash plate. In the opposite direction, the sludge flows down to the lower part of the swash plate. However, at this time, due to the opposite flow of the influent water and the sludge, mixing and poor sedimentation are caused. However, the present invention has a structure for supplying inflow water to the side surface of the swash plate, thereby improving the performance and utilizing the settled area utilization of the swash plate due to the change of the position of the opening through which the inflow water at the lower end flows. This makes it possible to solve the phenomenon of reduction of treatment efficiency by mixing and mixing the influent water and the concentrated sludge.

Further, the present invention is characterized in that the 25% processing capability is improved compared to the conventional slope plate settling facility. That is, in the existing slope sedimentation facility, the mixed water (mixed region) is formed by colliding and mixing with the sludge which is moved downward by the gravity to the bottom of the slope plate. This eventually accounts for 20% of the swash plate area, resulting in a reduction in processing capacity. By improving the flow rate change, the mixing area can be minimized and the processing capacity improvement result of about 25% can be obtained.

10: Early storm and overflow treatment device 11: Rapid mixing tank
13, 15: primary and secondary full speed mixing tank 17: buffering tank
18: swash plate settling facility 19; Sedimentation tank
20: Surplus sludge supply facility
21: coagulant injection facility 23: polymer injection facility
25, 27, 29: stirrer 31: opening
33: Scrapper 34: Swash plate unit
35: swash plate 37: stirrer
39: outlet pipe 41: inflow water pipe
43: surplus sludge pipe 45: storage tank
47: concentrated sludge pipe 53: upper cap
55: Lower cap 57: Left connection plate
59: right connection plate 61, 63, 71, 73:
79: sludge 110:
120: primary settling tank 130: aeration tank
140: Second settling tank 150: Ultraviolet sterilization tank

Claims (3)

A rapid mixing tank in which influent and flocculant react;
A slow mixing tank installed downstream of the rapid mixing tank and mixing the influent water and the polymer reacted in the rapid mixing tank;
An inclined plate sedimentation facility installed at a downstream end of the full mixing tank to separate sludge from the inflow water; And
And an excess sludge feeder for feeding the excess sludge for internal conveyance of the biological reaction process installed at the downstream end of the slope plate settling facility to the upstream side influent of the rapid mixing tank,
The inclination plate settling apparatus includes:
A sludge discharge pipe connected to the sludge discharging pipe to discharge the concentrated sludge;
A swash plate unit including a plurality of swash plates installed inside the settling tank and inclined at a predetermined angle, left and right connecting plates connecting the plurality of swash plates, and outlet pipes coupled to upper ends of the plurality of swash plates; And
A scrapper for collecting sludge falling down to the bottom of the settling tank in the direction of the sludge discharge pipe, and an agitator for rotating the scrapers,
Wherein the left and right connection plates are formed with side openings for introducing the inflow water into the side surfaces between the plurality of swash plates.
The method according to claim 1,
The slow mixing tank is composed of a first full-speed mixing tank in which a polymer is supplied by a polymer injecting facility, a second full-speed mixing tank in which the polymer is installed at a downstream end of the first full mixing tank and in which a polymer having a large specific gravity is formed, Respectively,
Further comprising a buffering tank installed downstream of the second full-speed mixing tank for temporarily storing the influent water overflowed in the second full-speed mixing tank.
3. The method of claim 2,
Wherein the side opening has a plurality of openings for uniformly distributing the flow rate between the swash plate and the swash plate.

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