KR101889710B1 - System for reusing sewage waste water - Google Patents

Abstract

The present invention relates to a wastewater reclaimed water production system for enhancing flocculation efficiency in a secondary treated wastewater and filtrating a fine suspended material to be used as domestic wastewater.
The present invention relates to a raw water transfer pump for pumping and transferring secondarily treated wastewater treatment water; A flocculating agent spraying unit for spraying and spraying the flocculant on the wastewater treatment water transferred by the raw water transfer pump; A sludge treatment unit for removing the sludge agglomerated by the flocculant; And a fine sludge filtration unit for performing a second filtration process on the fine particles in the treated water from which the sludge has been removed. In addition, since the pretreatment process is simplified, the installation site can be reduced, So that the reuse rate of the wastewater can be improved.

Description

{SYSTEM FOR REUSING SEWAGE WASTE WATER}

The present invention relates to a wastewater reclaimed water production system, and more particularly, to a wastewater reclaimed water production system that increases flocculation efficiency in a secondary treated wastewater and filtrates a fine suspended material to be used as domestic wastewater.

As the industry diversifies and becomes more sophisticated, a large amount of pollutants are released in various fields. As population density increases, domestic wastewater also continues to increase.

In particular, the amount of domestic sewage generated in the whole country is 15,441 thousand tons per day, for example, through 170 sewage treatment plants and 76,000 sewage treatment plants, and the sewage treatment rate is reduced from 73% to 80 %. In addition, there are 4,068,000 tons of industrial wastewater per day and 125,000 tons of livestock wastewater per day, but most of them are being discharged as they are.

In the past, it was common to discharge the sewage water discharged from the sewage treatment plant to the river. However, as the necessity of water resource development became important and the sewage treatment law was revised and the sewage treatment water was reused, the reuse rate gradually increased.

However, the sewage treatment water reuse rate is mainly used for intestinal washing water and cleaning water, and the off-site is used for river water holding water. In order to develop new types of water resources and cope with future water shortages appropriately, it is urgent to reuse large amounts of wastewater.

In the conventional pretreatment process for the effluent water of domestic and overseas sewage treatment plants, most of them are combined with drum filter filtration, multi-layer filtration, sand filtration, activated carbon, etc., but the removal of particulate matter is unstable, It is a situation.

In addition, the activated carbon filtration has a problem in that the replacement time of the activated carbon is generated even in a short time of operation, causing an increase in the operation cost and deterioration of the quality of the filtered water due to microbial propagation.

Therefore, conventional reuse of wastewater treatment effluent can only be used as washing water, cleaning water, and river maintenance water, and the wastewater treatment water quality is deteriorating, resulting in cost and site expenses for facility installation and operation And the use of reused water is avoided due to economic damages.

Document 1: Korean Patent Publication No. 2003-0092206

An object of the present invention is to provide a reusing water production system which can simplify the pretreatment process, reduce the installation site, improve the efficiency of removing fine suspended substances, and improve the reuse efficiency of wastewater.

In addition, the wastewater reclaimed water production system according to the present invention is intended to improve sludge treatment efficiency by improving coagulation efficiency.

In addition, the present invention provides a wastewater reclaimed water production system that filters raw materials by filtering a filter material, thereby filtering and desorbing sludge.

In order to solve the above problems, the present invention provides a raw water transfer pump for pumping and transporting secondary treated wastewater treatment water. A flocculating agent spraying unit for spraying and spraying the flocculant on the wastewater treatment water transferred by the raw water transfer pump; A sludge treatment unit for removing the sludge agglomerated by the flocculant; And a micro sludge filtration processing unit for performing a secondary filtration process on the fine foreign substances in the treated water from which the sludge has been removed.

According to an embodiment of the present invention, the coagulant jetting unit includes a rotating shaft that is rotated by the driving unit and a blush acceleration unit in the form of a brush or a screw provided on the rotating shaft, And a flocculant inlet port passing through the middle portion is further provided so that the flocculant injected into the flocculant inlet port is scattered and scattered by the rotating rotary shaft.

According to another aspect of the present invention, there is provided a sludge treatment system comprising: a solid sludge separator provided in an inner middle portion of a sludge treating apparatus for separating solid sludge from water containing sludge; A high-pressure filtration unit for sucking the water having passed through the solid sludge separation tank at a high pressure and filtering the fine sludge by a filter material coated on the outer wall to filter only the high-quality raw water; And a rotary shaft vertically penetrating the central portion of the solid sludge separator and having a separating screw integrally rotated at its lower end to coagulate the sludge and guide the sludge downwardly, wherein the high pressure filtration portion includes an upper support portion, And a filtration water discharge port connected to the lower end of the support part for filtering the sludge and allowing only the filtration water to pass therethrough and the filtration water discharge port connected to the upper support part to discharge the filtration water filtered by the filtration suction filter part.

According to an embodiment of the present invention, the filter suction filter unit includes an elastic spring connected to a lower portion of the fastening band, and a cylindrical fine mesh filter is attached to an outer side of the elastic spring. By the high pressure pump of the high- When the pump of the high-pressure filtration unit is stopped, the elastic spring is tensioned by elasticity, and the sludge attached to the outside of the fine mesh filter is tared by the impact, .

According to an embodiment of the present invention, the high-pressure filtration unit is provided in a plurality of the high-pressure filtration units to block the suction of the high-pressure filtration unit at one side, thereby removing the sludge adhered to the outside of the fine mesh filter, And the like.

According to an embodiment of the present invention, the fine sludge filtration processing unit includes a filter medium dilution tank and a fine sludge squeeze portion, wherein the fine sludge squeezing portion has a raw water inlet formed at an outer edge thereof and a discharge port formed at a central portion thereof The filtration material is passed through a dilution tank of filtration material to pass only the water and the filtration material is coated so that fine foreign substances contained in the raw water are filtered out .

The present invention is advantageous in that the pretreatment process is simplified to reduce the installation site as well as the removal efficiency of the fine suspended material is good and the reuse rate of the wastewater is improved.

In addition, the wastewater reclaimed water production system according to the present invention is advantageous in that the flocculation agent is finely sprayed and supplied to improve the flocculation efficiency and the sludge treatment efficiency.

In addition, the wastewater reclaimed water production system according to the present invention is advantageous in that the filtered filtration material is subjected to microfiltration while raw water passes, and the filtered sludge is desorbed to improve filtration performance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual diagram of a wastewater reclaimed water production system according to an embodiment of the present invention; FIG.
FIG. 2 is a cross-sectional view illustrating a brush and a screw form of the coagulant injecting unit in the wastewater reclaimed water producing system according to the embodiment of the present invention. FIG.
3 is a conceptual diagram schematically showing a sludge treatment unit of a wastewater reclaimed water production system according to an embodiment of the present invention.
FIG. 4 is a conceptual view showing an enlarged view of a high-pressure filtration unit of a sludge treatment unit of a wastewater reclaimed water production system according to an embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view of the micro-sludge filtration treatment unit of the wastewater reclaimed water production system according to the embodiment of the present invention,

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

The embodiments of the present invention described with reference to the drawings specifically illustrate an ideal embodiment of the present invention. As a result, various variations of the illustration, for example variations in the manufacturing method and / or specification, are expected. Thus, the embodiment is not limited to any particular form of the depicted area, but includes modifications of the form, for example, by manufacture. For example, the regions shown or described as being flat may have characteristics that are generally coarse / rough and nonlinear. Also, the portion shown as having a sharp angle may be rounded. Thus, the regions shown in the figures are merely approximate, and their shapes are not intended to depict the exact shape of the regions, nor are they intended to limit the scope of the present invention.

Generally, the second treated water of the wastewater treatment plant refers to the second settling water runoff prior to the chlorination disinfection process in the water treatment process for removing contaminants contained in the wastewater treatment water.

The raw water transfer pump 100, the coagulant spraying unit 200, and the sludge disposal unit 300 are installed in the sludge disposal unit 300, , And a fine sludge filtration processing unit (400).

Here, the raw water transfer pump 100 is for pumping the secondary treated wastewater treatment water to move it to the wastewater reclaimed water production system of the present invention.

As shown in FIG. 2, the coagulant jetting unit 200 is a device for rapidly mixing an input coagulant with an organic matter. The coagulant jetting unit 200 includes a driving unit 210 for applying a high rotational force and a driving unit 210 for rotating And a mixing accelerating unit 230 provided on the rotating shaft 220 and accelerating the mixing of the flocculant. The blend accelerator 230 may be implemented as a brush or as a screw. In addition, the rotating shaft 220 may further include a flocculant input port 240 so that the flocculant can be input.

3, the sludge disposal unit 300 includes a solid sludge separator 310 for rapidly separating sludge A floating at its lower end, a solid sludge separator 310 at its upper end, And a high-pressure filtration unit 320 for sucking the water having passed through the filtration unit 320 at a high pressure.

The solid sludge separator 310 includes a sludge barrier 311 for preventing the sludge A from rising upwardly and a raw water inlet 312 for introducing raw water and a sludge discharge port for discharging sludge in the sludge treatment unit 300 313). The sludge barrier 311 is installed in the middle part of the sludge treatment unit 300 and divides the sludge into a solid sludge separator 310 and a high pressure filtration unit 320. The sludge is introduced into the high pressure filtration unit 320 It blocks things. The sludge barrier 311 is formed with a strainer 314 through which fine pores are formed to cut sludge and discharge only filtered water.

4, a configuration of the high-pressure filtration unit 320 will be described in more detail. A plurality of filtration suction filter units 322 are formed at the lower end of the upper support unit 321 and formed at the upper end of the sludge treatment unit 300, And a filtration water outlet 323 and a high-pressure pump (not shown in the figure) are coupled to the upper portion of the upper support portion 321.

Particularly, the filtration suction filter unit 322 is provided with a fastening band 325 which is fastened to the upper support part 321 so as to be fastened, and an elastic spring 326 is connected to the lower part of the fastening band 325 . A mesh-like fine mesh filter 327, which is cylindrical, is placed on the outside of the elastic spring 326. A spring oil tool 328 is coupled to the lower end of the elastic spring 326 to support the elastic spring 326 and the fine mesh filter 327.

At this time, a plurality of high-pressure filtration units 320 of the sludge treatment unit 300 are provided so that even when the operation of one high-pressure filtration unit 320 is stopped, the other high-pressure filtration unit 320 is continuously operated to perform filtration can do.

It is also preferable to further include a rotating shaft 330 passing through the center of the sludge barrier 311 of the sludge treatment unit 300 up and down. At the lower end of the rotating shaft 330, a separating screw 331 is formed to rotate integrally with the rotating shaft 330.

A cleaning nozzle 340 is provided on the inner wall surface of the sludge processing unit 300 to discharge sludge A attached to the bottom of the sludge barrier 311 by spraying high pressure water, Thereby removing the sludge adhered to the sludge.

Here, the fine sludge filtering unit 400 may include a filter medium supply tank T and a fine sludge filter 420. Particularly, the fine sludge squeezing part 420 is formed by connecting a filtering material drawing net 422 between the multi-stage filtering plate 421 and the filtering plate 421. A raw water inlet 423 is formed at the outer edge of the filter plate 421 and an outlet 424 is formed at the center.

Hereinafter, the operation relationship of the present invention configured as described above will be described in more detail.

In order to more effectively reuse the wastewater secondary treatment water, the present invention provides a filtration system that can reliably remove residual organic matter including nitrogen and phosphorus, and meet the water quality standards for each use such as river water, agricultural water, city water, It is aimed at processing.

In particular, the pollutants in the wastewater secondary treatment water are classified into organic matter expressed by biochemical oxygen demand (BOD) and nitrogen and phosphorus, which are nutrient salts. In the conventional sewage treatment plant, organic matter is mainly treated and nitrogen And a considerable part of phosphorus can not be removed but is discharged as it is to the water system such as river, lake or ocean. This causes eutrophication phenomena in streams such as rivers and lakes, and causes red tides when they enter the ocean. In addition, if the eutrophication becomes worse, not only bad odor and water pollution are increased but also the use of drinking water and water can be limited.

Therefore, in order to prevent the above-mentioned problems, the present invention intends to improve coagulation efficiency and effectively treat the coagulated soluble organic matter in order to sufficiently remove nitrogen and phosphorus among pollutants in the wastewater secondary treatment water.

First, the raw water transfer pump 100 is operated to pump the secondarily treated wastewater treatment water, and then the wastewater treatment water is transferred to the coagulant sprayer 200 for high-speed mixing with the flocculant.

The flocculant supplied from the separate flocculant supply tank to the flocculant spray unit 200 is introduced through the flocculant inlet port 240 of the flocculant spray unit 200 and supplied through the space between the rotating shafts 220, And the blending accelerating part 230, which is a brush or a screw rotating at the same time as the blending accelerating part 230, is rapidly mixed with the raw water, and the efficiency of coagulation is improved.

Therefore, the soluble organic substances contained in the raw wastewater water are agglomerated by the coagulation of the flocculating agent, so that the soluble organic substances dissolved in the wastewater can be easily removed.

The flocculated raw water flows into the sludge disposal unit 300 again and the solid sludge is first blocked by the sludge barrier 311 of the solid sludge separator 310 so that the filtered water passes through the strainer 314, (320). At this time, the raw water flowing into the solid sludge separator 310 is moved by the rotational force of the rotating shaft 330, and the flocculation operation is continued, so that the raw water is gathered and sinks to the bottom side by its own weight. Then, the sludge is discharged to the lower sludge discharge port 313.

The water introduced into the high-pressure filtration unit 320 is again sucked into the filtration suction filter unit 322, which is sucked at a high pressure, so that the sludge is filtered and only the filtration water is discharged to the filtration water outlet 323 by the suction pressure of the high-

More specifically, when the high pressure pump is operated, water is sucked through the fine mesh filter 326 of the plurality of filtration suction filter units 322 fastened to the upper supporter 321, The filter medium flowing into the sludge processing unit 300 is also sucked together and coated on the outer wall of the fine mesh filter 326. The fine sludge is filtered by passing through the pores of the filter medium attached to the outer wall of the fine mesh filter 326 of the raw water filtration suction filter unit 322 that has passed through the solid sludge separator 310.

At this time, the filter medium and the sludge are attached to the outside of the fine mesh filter 326 to raise the pressure inside the filtration suction filter unit 322. The fine mesh filter 326 is pulled upward while being compressed, The elastic springs 325 in the inner ring 326 are compressed at the same time. Then, as the pores of the squeezed fine mesh filter 226 become smaller, the fine sludge is filtered.

The water that has passed through the plurality of fine mesh filters 326 and is introduced into the inside is discharged to the filtered water outlet 323 through the upper support portion 321 of the filtration suction filter portion 322 to be collected into a separate filtration tank, And is transported to a place.

In the present invention, a plurality of high-pressure filtration units 320 are formed, filtration is performed by the high-pressure filtration unit 320 on one side, and the sludge filtered by the fine mesh filter 326 causes the fine mesh filter 326 The pore is clogged and the filtration efficiency is lowered. At this time, when the operation of the high-pressure filtration unit 320 of one side is stopped, the pressure inside the filtration suction filter unit 322 is released, and the compressed elastic spring 325 is lowered by the elastic force and the fine mesh filter 326 It is instantly restored to its original state. The sludge adhered to the outside of the fine mesh filter 326 is desorbed.

Even when the filtration of the one-side high-pressure filtration unit 320 is stopped, filtration continues in the other high-pressure filtration unit 320, and filtration and backwashing are repeatedly performed in the high-pressure filtration unit 320 on both sides , So that the filtration can be prevented from being interrupted.

By supplying the backwash water into the high-pressure filtration unit 320 by using a separate pump, high-pressure water is injected from the inside of the fine mesh filter 326 of the filtration suction filter unit 322 to the outside to improve desorption of the sludge It is also possible.

In addition, the sludge adhered to the bottom surface of the sludge barrier block 311 and the fine mesh filter 326 of the high-pressure filtration part 320 can be desorbed by spraying high-pressure water from the cleaning nozzle 340.

The water filtered by the sludge processing unit 300 is subjected to secondary filtration while passing through the fine sludge filtering unit 420 of the fine sludge filtering unit 400. First, when the filter medium dilution liquid is supplied from the filter medium supply tank T to the fine sludge filter 420, the filter medium dilution liquid is divided and moved through the raw water inflow port 423 formed in each filter plate 421, The filter material is applied to the filter material drawing net 422 and only the water is discharged through the discharge opening 424. [ The raw water flowing through the raw water inlet 423 from the sludge disposal unit 300 similarly passes through the pores of the filter material applied to the filter material sifter 422 of each filter plate 421 so that fine foreign matters are filtered to be filtered.

As described above, in the wastewater reclaimed water producing system of the present invention, the suspended solids are coagulated by the coagulant spraying unit 200, and the sludge A is aggregated by the sludge disposal unit 300 to separate the solid sludge. Further, the water filtered in the sludge disposal unit 300 is filtered again by the high-pressure filtration unit 320, and secondary sludge is filtered by the sludge filtration unit 400 to produce high-quality reusable water, By controlling the progress of each of these processes by a separate control unit, a warning may be generated in the case of abnormal operation.

100: raw water transfer pump 200: coagulant dispenser
210: driving part 220:
230: Acceleration accelerator 240: Flocculating agent inlet
300: sludge treatment unit 310: solid sludge separator
311: sludge block 312: raw water inlet
313: Sludge outlet 314: Strainer
320: high pressure filtration part 321: upper support part
322: Filtration suction filter unit 323: Filtration water outlet
325: Fastener
326: elastic spring 327: fine mesh filter
330: rotating shaft 340: cleaning nozzle
400: fine sludge filtration treatment unit 410: filtration material supply tank
420: fine sludge squeeze portion 421: filtration plate
422: Filter material drawing net 423: Raw water inlet
424: Outlet

Claims (7)

A raw water transfer pump for pumping and transferring the second treated wastewater treatment water;
And a bladed or screw-shaped blending accelerating portion provided on the rotating shaft, wherein the blending accelerating portion is provided with a driving portion for crushing the flocculant in the wastewater treatment water conveyed by the raw water transfer pump, A flocculating agent injecting unit for further flocculating the flocculating agent injected into the flocculating agent inlet through a rotary shaft while being scattered by the flocculating agent injecting unit;
A sludge separator for separating the solid sludge from the raw water containing the sludge by passing water through the sludge, and a filter medium coated on the outer wall by sucking the water having passed through the solid sludge separator at a high pressure, A high pressure filtration unit for filtering and filtering only the high quality filtered water; a rotating shaft for vertically passing the center of the solid sludge separator and cooperating to rotate the separating screw integrally to coagulate the sludge and to guide the sludge downward; The high pressure filtration unit includes an upper support unit and a filtration suction filter unit that is connected to the lower end of the upper support unit in a large number of communication so as to filter the sludge and allow only filtration water to pass therethrough and a filtration suction filter unit that is connected to the upper support unit and is filtered by the filtration suction filter unit. A filtration water outlet for discharging the filtrate, Sludge processor to remove the agglomerated sludge treatment; And
Wherein the filtration material dilution tank and the fine sludge squeezing portion are stacked in a multi-stage filtration plate in which a raw water inlet is formed at an outer edge of the fine sludge squeeze portion and an outlet is formed at a central portion thereof, And a fine sludge filtration unit for passing only water from the filter medium dilution tank through the filtration material dilution tank and allowing the filtration material to be coated and then subjecting the microfilament to secondary filtration treatment with the treated water from which the sludge has been removed,
In the filtration suction filter unit, an elastic spring is connected to the lower portion of the fastening band, a cylindrical fine mesh filter is attached to the outside of the elastic spring, and when the raw water is sucked by the high pressure pump of the high pressure filtration portion, Wherein when the pump of the high-pressure filtration unit is stopped, the elastic spring is tensioned by elasticity, and the sludge attached to the outside of the fine mesh filter is desorbed by the impact when the pump of the high-pressure filtration unit is stopped. The method according to claim 1,
Wherein the high pressure filtration unit is provided with a plurality of the high pressure filtration units to block the suction of the high pressure filtration unit on one side so as to desorb the sludge adhered to the outside of the fine mesh filter while allowing the high pressure filtration unit on the other side to continue filtration. system. delete delete delete delete delete

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