WO2018105851A1 - System for reclaiming sewage/wastewater for reuse - Google Patents

Abstract

The present invention relates to a system for reclaiming sewage/wastewater for reuse, wherein secondarily treated sewage/wastewater can be reclaimed to domestic water by improving coagulation efficiency and filtering even fine floating substances. The present invention can be implemented by comprising: a raw water transfer pump for pumping and transferring secondarily treated sewage/wastewater; a coagulant spray part for pulverizing a coagulant and spraying the coagulant to the treated sewage/wastewater transferred by the raw water transfer pump; a sludge treatment part for removing a sludge coagulated by the coagulant; and a fine-sludge filtering/treating part for secondarily filtering/treating fine foreign substances in the treated water from which the sludge has been removed. There is an advantage in that a pre-treatment process is simplified to reduce an installation site and the removal efficiency of fine floating substances is excellent, thus increasing the reuse rate of sewage/wastewater.

Description

Wastewater Recycling Water Production System

The present invention relates to a wastewater recycled water production system, and more particularly, to a wastewater recycled water production system for improving the cohesive efficiency of secondary treated wastewater and filtering fine suspended solids to be used as living water.

As the industry diversifies and advances, various and large amounts of pollutants are emitted from each sector, and as the population density increases, household wastewater also continues to increase.

In particular, domestic sewage generated in Korea is 15,441 thousand tons per day, and is treated through 170 sewage treatment plants and 76,000 sewage treatment facilities, and the daily sewage treatment rate is 80% from 73%. It is planned to increase to%. In addition, industrial wastewater, for example, 4,068 thousand tons per day and livestock waste is generated 15,000 thousand tons per day, but most of them are discharged as it is.

In the past, it has been common to discharge sewage treatment water discharged from sewage treatment plants into rivers, but as the need for water resource development emerges and the sewage law is revised, mandatory reuse of sewage treatment water is increasing.

However, the reuse rate of sewage treatment water is mostly used for intestinal washing and cleaning water, and for the outside, it is only used for river maintenance water. Accordingly, in order to develop new types of water resources and cope with future water shortages, it is urgent to reuse huge amounts of sewage treatment water.

The pre-treatment process of effluent from domestic and foreign sewage treatment plants, which has been used conventionally, is mostly performed by combining drum filter filtration or multilayer filtration, sand filtration, activated carbon, etc. Situation.

In addition, activated carbon filtration has a problem in that the replacement time of activated carbon occurs even in a short time of operation, causing an increase in operating costs and also causing deterioration of the filtered water due to microbial propagation.

Therefore, the reuse of the conventional sewage treatment effluent is only used for washing water, cleaning water, and stream maintenance water, and the cost, site, etc. of facility installation and operation due to deterioration of sewage treatment water quality are less than benefits due to reduced water usage. It is avoiding the use of recycled water due to high economic damage.

The present invention is to provide a recycled water production system that can simplify the pretreatment process, reduce the installation site as well as improve the efficiency of removal of fine suspended matter to improve the reuse efficiency of wastewater.

In addition, the wastewater recycled water production system according to the present invention is to improve the flocculation efficiency to improve the sludge treatment efficiency as its technical problem.

In addition, the wastewater recycled water production system according to the present invention is to coat the filter medium to suck the raw water to filter and desorb the sludge as its technical problem.

The present invention is a raw water transfer pump for pumping and transporting the secondary treated sewage treatment water to solve the above problems; A flocculant injection unit for pulverizing and injecting a flocculant into the sewage treatment water transported by the raw water transfer pump; A sludge treatment unit for removing sludge aggregated by the flocculant; And a fine sludge filtration treatment unit for performing secondary filtration on fine foreign matters in the treated water from which the sludge has been removed.

In addition, according to an embodiment of the present invention, the flocculant injection unit is provided with a drive unit, and includes a rotating shaft rotated by the drive unit and a mixing acceleration portion in the form of a brush or screw provided on the rotating shaft, the rotation axis in the longitudinal direction A coagulant inlet penetrating through the middle portion is further provided, so that the coagulant introduced into the coagulant inlet is pulverized while being scattered by the rotating shaft.

In addition, according to one embodiment of the present invention, the sludge treatment unit is provided in the inner middle portion, the solid sludge separator for separating the water and the solid sludge is passed through the water from the raw water containing the sludge; A high pressure filtration unit for sucking water passing through the solid sludge separator at a high pressure to filter fine sludge by a filter material coated on an outer wall and to filter out only fine water; And a rotating shaft penetrating the center portion of the solid sludge separator vertically up and down, and having a separating screw integrally rotated at the lower end to aggregate the sludge and guide the sludge downward. The high pressure filtering part includes an upper support part and the upper part. It is characterized in that it comprises a filtration suction filter portion connected to the lower end of the support portion and the sludge is filtered and passing only the filtered water and the filtration water discharge port connected to the upper support portion to discharge the filtered water filtered by the filtration suction filter portion.

In addition, according to an embodiment of the present invention, the filtration suction filter portion is connected to the elastic spring long under the fastening table, the outer side of the elastic spring is covered with a cylindrical fine mesh filter, raw water by the high pressure pump of the high pressure filter In the case of suction, the elastic spring is compressed to narrow pores of the fine mesh filter, and when the pump of the high pressure filter is stopped, the elastic spring is stretched by elasticity and the sludge attached to the outside of the fine mesh filter is detached by the impact. It is characterized by.

In addition, according to an embodiment of the present invention, the high-pressure filter is provided with a plurality, so that the suction of the high-pressure filter of one side to remove the sludge attached to the outside of the fine mesh filter while the other high-pressure filter to continue filtering Characterized in that to be made.

In addition, according to an embodiment of the present invention, the fine sludge filtration treatment unit includes a filter ash dilution tank and a fine sludge filtration unit, the fine sludge filtration unit, the filter plate is formed in the outer edge of the raw water inlet and the outlet is formed in the center Stacked in multiple stages, the filter medium screen is coupled between the filter plate and the filter plate to pass only the water from the filter medium dilution liquid supplied from the filter medium dilution tank, the filter medium to be coated, and then to filter the fine foreign matter contained in the raw water It features.

The present invention has the advantage that the pretreatment process can be simplified to reduce the installation site as well as the removal efficiency of the fine suspended solids is improved to improve the reuse rate of the wastewater.

In addition, the wastewater recycled water production system according to the present invention has the advantage that the flocculant is finely supplied by injection to improve the coagulation efficiency and the sludge treatment efficiency.

In addition, the wastewater recycled water production system according to the present invention has an advantage of improving the filtration performance by allowing fine filtration and the filtered sludge to desorb while passing raw water through the coated filter medium.

1 is an overall conceptual diagram of a sewage recycled water production system according to an embodiment of the present invention

Figure 2 is an exemplary cross-sectional view showing the brush and screw shape of the flocculant injection unit in the wastewater reused water production system according to an embodiment of the present invention

Figure 3 is a schematic diagram showing a sludge treatment unit of the wastewater reused water production system according to an embodiment of the present invention

Figure 4 is an enlarged conceptual view showing the separation of the high pressure filter of the sludge treatment unit of the wastewater recycled water production system according to an embodiment of the present invention

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the term "comprising" embodies a particular characteristic, region, integer, step, operation, element, and / or component, and other specific characteristics, region, integer, step, operation, element, component, and / or group. It does not exclude the presence or addition of.

Unless defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Commonly defined terms used are additionally interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined.

Embodiments of the invention described with reference to the drawings specifically illustrate an ideal embodiment of the invention. As a result, various modifications of the drawings, for example, manufacturing methods and / or specifications, are expected. Thus, the embodiment is not limited to the specific form of the illustrated region, but includes, for example, modification of the form by manufacture. For example, regions shown or described as flat may have properties that are generally rough and / or rough. Also, portions shown to have sharp angles may be rounded. Accordingly, the regions shown in the figures are only approximate in nature, and their forms are not intended to depict the exact form of the regions and are not intended to narrow the scope of the invention.

In general, the secondary treated water in the sewage treatment plant refers to the secondary sedimentation effluent before the chlorine disinfection process in the water treatment process for removing contaminants contained in the sewage treatment water.

Referring to Figure 1 to Figure 4 to explain in more detail the configuration of the wastewater recycled water production system according to an embodiment of the present invention, the raw water transfer pump 100, the flocculant injection unit 200 and the sludge treatment unit 300 And, it may include a fine sludge filtration treatment unit (400).

Here, the raw water transfer pump 100 is for pumping the sewage treatment water treated secondly to move to the wastewater reused water production system side of the present invention.

Here, as shown in FIG. 2, the flocculant injection unit 200 is a device for allowing the injected flocculant to quickly mix with the organic material. The rotating shaft 220 and the rotating shaft 220 includes a mixing accelerator 230 for accelerating the mixing of the flocculant. The mixing accelerator 230 may be implemented in the form of a brush, or may be implemented in the form of a screw. In addition, the rotating shaft 220 may be further provided with a flocculant inlet 240 to inject a flocculant.

Here, the sludge treatment unit 300 partitions the inside up and down, as shown in FIG. 3, the lower portion of the solid sludge separator 310 for rapidly separating the floating sludge A, and the upper portion of the solid sludge separator 310. It is partitioned into a high pressure filtration unit 320 to filter the water passing through the suction at high pressure.

Solid sludge separator 310 is the sludge block 311 to prevent the sludge (A) from rising to the top, and the raw water inlet 312 for introducing the raw water, and the sludge discharge port for discharging the sludge in the sludge treatment unit 300 ( 313). The sludge blocking unit 311 is installed in the inner middle portion of the sludge treatment unit 300 serves to partition the solid sludge separator 310 and the high pressure filter 320, the sludge is introduced into the high pressure filter 320. Block it. The sludge blocking block 311 is formed with a strainer 314 formed with fine pores so as to block sludge and discharge only filtered water.

Referring to Figure 4 in more detail the configuration of the high-pressure filtration unit 320, is formed in the upper end of the sludge treatment unit 300, a plurality of filtration suction filter unit 322 at the bottom of the upper support portion 321 is in communication with each other Is connected and fastened so as to, the upper portion of the upper support portion 321 is formed by combining the filtered water outlet 323 and a high pressure pump (not shown).

In particular, the filtration suction filter 322 is provided with a fastening table 325 is formed to be fastened to the upper support 321, the elastic spring 326 is connected to the lower side of the fastening table 325 long downward. . The outer side of the elastic spring 326 is covered with a micro mesh filter 327 in the form of a micro mesh to be cylindrical. In addition, 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, the high pressure filtration unit 320 of the sludge treatment unit 300 is provided with a plurality so that even when the operation of one high pressure filtration unit 320 is stopped, the other high pressure filtration unit 320 continues to operate so that filtration is performed. can do.

On the other hand, it is also preferable to further include a rotary shaft 330 penetrating up and down the center portion of the sludge blocking unit 311 of the sludge treatment unit 300. Separation screw 331 is formed at the lower end of the rotary shaft 330, so as to rotate integrally with the rotary shaft 330.

In addition, the washing nozzle 340 is provided on the inner wall surface of the sludge treatment unit 300 to spray high pressure water, thereby detaching the sludge (A) attached to the bottom surface of the sludge blocking unit 311 and filtering the high pressure filter 320. Desorbs the sludge attached to it.

Here, the fine sludge filtration treatment unit 400 may include a filter medium supply tank (T) and the fine sludge filter 420. In particular, the fine sludge filtration unit 420 is composed of a filter medium filter net 422 is coupled between each of the multi-stage filter plate 421 and the filter plate 421. A raw water inlet 423 is formed at an outer edge of the filter plate 421 and an outlet 424 is formed at the center thereof.

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

The present invention provides a stable removal of residual organic matter, including nitrogen and phosphorus, and filtration to meet water quality standards for each use, such as river maintenance water, agricultural water, urban water, or industrial water, so that secondary wastewater can be reused more effectively. Aimed at processing.

In particular, pollutants in the sewage treatment secondary water are largely classified into organic matter and nutrients nitrogen and phosphorus represented by biochemical oxygen demand (BOD). Conventionally, sewage treatment plants have organic substances as main treatments, and nitrogen as nutrients A large portion of the wine was not removed, but there was a problem that it is discharged to the river, the lake or the water system such as the ocean. This causes eutrophication in rivers and lakes, and causes red tide when introduced into the ocean. In addition, severe eutrophication causes odors, aggravates water pollution, and limits the use of drinking water and waterways.

Therefore, the present invention is to improve the coagulation efficiency in order to sufficiently remove nitrogen and phosphorus in the contaminants of the sewage treatment secondary water in order to prevent the above conventional problems, and to effectively filter the aggregated soluble organic matter.

To this end, first, the raw water transfer pump 100 is operated to pump the sewage treated water that has been treated secondly, and then transferred to the flocculant injection unit 200 to be mixed with the flocculant at high speed.

In addition, the flocculant supplied from the separate flocculant supply tank to the flocculant injection unit 200 is introduced through the flocculent inlet 240 of the flocculant injection unit 200 and is supplied through the space between the rotation shafts 220 to rotate the rotation shaft 220. By the mixing acceleration portion 230 is made of a brush or screw that rotates at the same time with the), while the rapid mixing with the raw water is made, the efficiency of the aggregation is improved.

Therefore, while the soluble organics contained in the raw waste water are agglomerated by the mixing of the coagulant, the soluble organics dissolved in the sewage water can be easily removed.

The raw water, which has been agglomerated, is introduced into the sludge treatment unit 300 again, and the solid sludge is blocked by the sludge blocker 311 of the solid sludge separator 310, and the filtered water is passed through the strainer 314 to filter the high pressure. It is moved to the unit 320. At this time, the raw water introduced into the solid sludge separator 310 is agglomerated while the coagulation operation continues while flowing by the rotational force of the rotary shaft 330, and sinks to the bottom side by its own weight. Then, the aggregated sludge is discharged to the sludge discharge port 313 at the bottom.

Water introduced into the high pressure filter unit 320 is sucked into the filtration suction filter unit 322 which is suctioned at a high pressure, and the sludge is filtered, and only the filtered water is discharged to the filtered water outlet 323 by the suction pressure of the high pressure pump.

In more detail, when the high pressure pump is operated, water is sucked through the micro network filter 326 of the plurality of filtration suction filter units 322 fastened to the upper support part 321, and a separate filter supply tank T The filter medium introduced into the sludge treatment unit 300 is also sucked and coated on the outer wall of the fine mesh filter 326. And, the raw water passing through the solid sludge separator 310 is also sucked into the fine mesh filter 326 of the filtration suction filter 322, the fine sludge is filtered through the pores of the filter medium attached to the outer wall.

At this time, the filter material and the sludge is attached to the outside of the fine mesh filter 326 to increase the pressure inside the filtration suction filter unit 322, the fine mesh filter 326 is pulled upward while being compressed, the fine mesh filter ( The elastic spring 325 inside the 326 is also compressed at the same time. Then, the pores of the compressed micro network filter 226 becomes smaller and filtered to fine sludge.

Water introduced through the plurality of fine mesh filters 326 is discharged to the filtered water outlet 323 through the upper support portion 321 of the filtration suction filter 322 to be collected or used as a separate filtration tank Will be transported to the place.

On the other hand, in the present invention, a plurality of high-pressure filtration unit 320 is formed, the filtration by the high-pressure filtration unit 320 on one side of the fine mesh filter 326 due to the sludge filtered by the fine network filter 326 Pore clogging may reduce filtration efficiency. At this time, when the operation of the high-pressure filtration unit 320 on one side is stopped while the pressure inside the filtration suction filter unit 322 is released, the compressed elastic spring 325 is lowered by the elastic force and the fine mesh filter 326 is also lowered. It is instantly restored to its original state and restored. And, the sludge attached to the outside of the fine mesh filter 326 is to be detached.

When the filtration of one side of the high pressure filtering unit 320 is stopped in this way, the filtration is continuously performed in the high pressure filtering unit 320 on the other side, and the filtration and backwashing are repeatedly performed in the high pressure filtering unit 320 on both sides. The filtration can be prevented from stopping.

Then, by supplying backwash water into the high pressure filtration unit 320 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 improve the desorption of the sludge. It is also possible.

In addition, the high pressure water is injected from the washing nozzle 340 to detach the sludge attached to the bottom surface of the sludge blocking block 311 and the fine mesh filter 326 of the high pressure filter 320.

Water filtered by the sludge treatment unit 300 is subjected to secondary filtration while passing through the fine sludge filtration unit 420 of the fine sludge filtration treatment unit 400. To this end, first, when the filter medium dilution liquid from the filter medium supply tank (T) to the fine sludge filtration unit 420, the filter medium dilution liquid is divided and moved through the raw water inlet 423 formed in each filter plate 421, The filter medium is caught and applied to the filter medium 422 and only water is discharged through the outlet 424. Thereafter, the raw water introduced from the sludge treatment unit 300 through the raw water inlet 423 passes through the pores of the filter medium applied to the filter medium filter 422 of each filter plate 421 to filter fine foreign matter.

As described above, in the wastewater recycled water production system of the present invention, the suspended solids are aggregated by the flocculant injection unit 200 and the sludge A is aggregated by the sludge treatment unit 300 to separate the solid sludge. In addition, the water filtered in the sludge treatment unit 300 is again filtered fine sludge in the high-pressure filtration unit 320, the secondary filtration is made by the fine sludge filtration unit 400 can be produced high quality recycled water, By managing the progress of each of these processes by a separate control unit, a warning may be generated in case of abnormal operation.

Claims (7)

1. Raw water transfer pump for pumping and transporting the secondary treated sewage treatment water;

   A flocculant injection unit for pulverizing and injecting a flocculant into the sewage treatment water transported by the raw water transfer pump;

   A sludge treatment unit for removing sludge aggregated by the flocculant; And

   And a fine sludge filtration treatment unit for performing secondary filtration treatment of fine foreign matters in the treated water from which the sludge has been removed.
2. The method of claim 1, wherein the flocculant injection unit,

   A driving unit is provided, and includes a rotating shaft rotated by the driving unit and a mixing acceleration part in the form of a brush or a screw provided on the rotating shaft, and the rotating shaft further includes a coagulant inlet penetrating the intermediate part in a longitudinal direction, and into the coagulant inlet. Wastewater reused water production system, characterized in that the flocculant to be injected is crushed while being scattered by the rotating shaft.
3. According to claim 1, The sludge treatment unit,

   A solid sludge separator provided in the inner middle part to pass water upward from the raw water including sludge and to separate the solid sludge;

   A high pressure filtration unit for suctioning the water passing through the solid sludge separator at a high pressure to block and filter fine sludge by the filter material coated on the outer wall and to discharge only high quality filtered water; And

   And a rotary shaft penetrating the center portion of the solid sludge separator vertically up and down, and having a separation screw integrally rotated at the lower end to aggregate the sludge and guide the sludge downward.

   The high pressure filtration unit is connected to the upper support portion and the lower end of the upper support portion, the filter suction filter unit for filtering sludge and passing only the filtered water and the upper support unit connected to the upper support portion to discharge the filtered water filtered by the filtration suction filter unit. Wastewater reused water production system, characterized in that it comprises a filtered water outlet.
4. The method of claim 3, wherein

   The filtration suction filter portion is connected to the lower elastic spring is long, the outer side of the elastic spring is covered with a cylindrical fine mesh filter, when the raw water is sucked by the high pressure pump of the high pressure filter the elastic spring is compressed to fine When the pore of the network filter is narrowed and 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 detached by the impact.
5. The method according to claim 3 or 4,

   The high-pressure filtration unit is provided with a plurality, so as to block the suction of the high-pressure filtration unit on one side to remove the sludge attached to the outside of the micro network filter, while at the same time the high-pressure filtration unit on the other side to produce wastewater reused water characterized in that the filtration is continued. system.
6. The method of claim 1, wherein the fine sludge filtration treatment unit,

   It includes a filter medium dilution tank and fine sludge filtration,

   The fine sludge filter part,

   A filter plate having a raw water inlet at an outer edge and a discharge port at a central part thereof is stacked in multiple stages, and a filter medium screen is coupled between the filter plate and the filter plate, so that only water passes from the filter medium diluted from the filter dilution tank. After that, the wastewater recycled water production system, characterized in that to filter the fine foreign matter contained in the raw water.
7. According to claim 6, The sludge treatment unit,

   A solid sludge separator provided in the inner middle part to pass water upward from the raw water including sludge and to separate the solid sludge;

   A high pressure filtration unit for sucking the water passing through the solid sludge separator at a high pressure to block and filter fine sludge and to discharge only high quality raw water; And

   And a rotary shaft penetrating the center portion of the solid sludge separator vertically up and down, and having a separation screw integrally rotated at the lower end to aggregate the sludge and guide the sludge downward.

   The high pressure filtering unit is connected to the upper support portion, the lower end of the upper support portion and the filtration suction filter portion for filtering the sludge and passing only the filtered water, and the filtration water filtered by the filtration suction filter portion connected to the upper support portion Wastewater recycled water production system comprising a discharged filtered water outlet and a high pressure pump.

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