KR20120046809A - Integrated sewage disposal device for removing total phosphorus in treated sewage - Google Patents

Abstract

PURPOSE: An integrated sewage treating apparatus for eliminating total phosphorus from sewage treated water is provided to simplify the structure of the apparatus by integrating a line mixer, a settling basin, and a separating membrane bath. CONSTITUTION: An integrated sewage treating apparatus for eliminating total phosphorus from sewage treated water includes a line mixer(120), a settling basin(130), and a separating membrane bath(140). Sewage treated water is introduced into the line mixer. Granulated active carbon is introduced into the line mixer. The line mixer rapidly mixes the materials. The sewage treated water containing the granulated active carbon is introduced into the upper side of the settling basin. The settling basin generates vortex to settle sludge, and supernatant is discharged from the settling basin. A separating membrane(141) is installed in the separating membrane bath and filters the supernatant.

Description

INTEGRATED SEWAGE DISPOSAL DEVOSAL DEVICE FOR REMOVING TOTAL PHOSPHORUS IN TREATED SEWAGE}

The present invention relates to an integrated sewage treatment apparatus for total phosphorus removal in sewage treatment water, and in particular, by administering a flocculant to sewage treatment water to aggregate and precipitate total phosphorus, and solid-liquid separation through a separation membrane to maximize total phosphorus removal. An integrated sewage treatment apparatus for removing phosphorus in sewage treatment water.

The settling clarifier is divided into primary sedimentation basin and secondary sedimentation basin. In the case of sewage treatment plant, the first sedimentation basin is the first process to remove various solids in the incoming sewage, and in the case of waste water treatment plant, The chemical sedimentation basin installed to remove the floc condensed at the rear end of is called primary sedimentation basin. On the other hand, the secondary sedimentation basin means the sedimentation basin installed for the purpose of removing the microbial sludge proliferated in the biological treatment process by installing in the water spray bed or aeration tank.

Much of municipal sewage and factory wastewater sinks to the bottom of the sedimentation basin as suspended solids (SS).

The rate of sedimentation of suspended suspended solids in a gravity sedimentation basin depends on the size and specific gravity of the condensate, the concentration of particles, the temperature of the wastewater, the residence time, the type of sedimentation basin, the effective depth, and the surface condition. While 60% of SS and 30% of BOD are generally removed in gravity settler for 2 hours residence time, the removal efficiency of factory wastewater varies greatly depending on the characteristics of the wastewater.

As described above, the sedimentation basin is a very important unit process in the whole sewage / wastewater treatment process, and a larger treatment plant is designed and operated in a rectangular shape rather than a circular shape. However, suspended solids and soluble contaminants with similar or lighter specific gravity than water are not removed from the sedimentation basin even if the residence time is long, but they flow into the river or sea with treated water, causing secondary pollution such as eutrophication, green algae, and red tide. .

In particular, the efficient removal of phosphorus, which is a major factor of eutrophication and acts as the most sensitive factor, is very important. Therefore, the global trend is that the regulation of “T-P” among the water quality standards of effluent is becoming stricter day by day.

Representative nutrients that cause eutrophication include phosphorus, nitrogen, and carbon. The rate at which these components cause green algae bloom red tide As P: N: C = 1: 7: 40, the content of the phosphorus component shows the highest sensitivity, and a trace amount of the phosphorus component at a concentration of 0.1 mg / L is known to be a sufficient concentration to cause green algae. As described above, "T-P" is acting as a major cause of algae growth, and organic water pollution due to algae is estimated to occupy 25 to 30% of the total organic load. Therefore, in the case of urban sewage treatment plants, the effluent water quality standard for total phosphorus is 8 → 2 → 0.5 → 0.3 → 0.2 mg / L, which is strictly strengthened at home and abroad.

Among the water pollutants, the phosphorus component is more than 90% removed by the sludge drawing.In order to effectively remove the phosphorus component due to the sludge drawing, the soluble phosphorus component in the water is excessively absorbed (intake, uptake) into the microorganism by the mechanism of the microorganism. Along with the sludge, it is condensed into flocs with a specific gravity greater than water and settles well in the settling basin to be removed. However, flocs formed with a specific gravity lower than water are difficult to expect gravity sedimentation and susceptibility to changes in temperature, such as susceptibility to changes in water temperature. It is only 8-8% (average 70%, discharge water quality 0.46-1.417 mg / L). However, if the chemical flocculation process is additionally performed, the total treatment efficiency is improved to 92.1 to 96.5% (average 94%, discharged water quality 0.122 to 0.236 mg / L), and if it is added to the filtration facility, the total treatment efficiency is up to 99%. It is reported by domestic and foreign environmental organizations that can be expected.

In order to completely remove the phosphorus component that is the main cause of algae generation as described above, even if there are changes in the external environment such as water temperature change, more stable and efficient floc formation method and effective removal method for all formed flocs should be sought. do.

In order to remove the total phosphorus, Korean Laid-Open Patent Publication No. 2002-0057592 (name: high speed agglomeration inclined plate settling device connected to the rapid reaction tank and slow agglomeration tank) was developed and applied.

As shown in FIG. 1, the rapid reaction tank and the slow aggregation tank connected to the rapid aggregation tank settle down device, the rapid reaction tank 30, the slow aggregation tank 32, the flow path 4, the gradient plate 5, and the settling tank 39. Consists of.

One side of the rapid reaction tank 30 is the raw water to be purified, the first water flow guide plate 1 is provided to guide the flow of raw water. The first water flow guide plate 1 is configured such that the flow of raw water flows from the bottom to the top for the optimum speed gradient in the rapid reaction tank 30. Rapid reaction tank 30 is a square, the raw water is supplied from the bottom is discharged to the upper portion and the first stirrer (2) is installed in the central upper portion. And, one side of the recycle pipe 34 is extended to the rapid reaction tank 30, it is possible to inject some sludge into the rapid reaction tank (30).

The slow agglomeration tank 32 has a square shape and is connected in series with the rapid reaction tank 30, so that water discharged through the upper portion of the rapid reaction tank 30 is introduced into the slow agglomeration tank 32, and the slow agglomeration tank 32 is used. It is configured to discharge through the lower part of the). A second stirrer 3 is installed at the center upper portion of the slow aggregation tank 32 to stir so that aggregation is effectively performed. In addition, the upper one side of the slow aggregation tank 32 is configured to be able to administer the organic polymer coagulant.

The upper part of the settling tank 39 has a rectangular shape and the lower part has a substantially cylindrical shape, and a scraper 7 and a sludge collection pit 8 are installed at the lower part, and a plurality of inclined plates 5 and a treated water overflow wear channel at the upper part. The apparatus 6, the scraper drive device 36, and the process water discharge port 38 are provided.

The inclined plate 5 is a large upflow split type inclined plate, which is maintained at an angle of 50 to 70 degrees with respect to the horizontal direction, and the intermediate region is bent. Each side of the inclined plate 5 has a trapezoidal corrugation form at regular intervals. A plurality of such inclined plates 5 are arranged while maintaining a constant interval. Therefore, the space between each inclined plate 5 becomes a structure which has a cross section (foot column), and a series of parallel flow paths are formed.

However, the conventional fast reactor and slow agglomeration tank is connected to the high-speed aggregation inclined plate settled device is complicated device configuration, difficult to install and maintain, there is a problem that the power costs are relatively high to drive each device.

The present invention is to solve the above problems, by administering a flocculant to the sewage treatment water to aggregate and precipitate the total phosphorus, to maximize the removal of the total phosphorus by solid-liquid separation through the separation membrane, integrated line mixer, sedimentation tank and membrane membrane It is an object of the present invention to provide an integrated sewage treatment apparatus for total phosphorus removal in sewage treatment water to simplify the configuration and to facilitate installation and maintenance.

Another object of the present invention is to provide an integrated sewage treatment apparatus for removing phosphorus in sewage treatment water, which can be used as a washing tank when cleaning the separation membrane by separating the separation tank by a sedimentation tank and a partition wall.

Features of the present invention for achieving the above object,

A line mixer into which sewage treatment water is introduced, and a coagulant and granular activated carbon as a coagulant are introduced to rapidly mix them; The sedimentation tank is formed in a rectangular shape, the bottom is narrowed, and the sewage treatment water in which the flocculant and the granular activated carbon are mixed from the line mixer is introduced into the upper portion, while precipitating sludge while overflowing the sewage, and discharging the supernatant; And it is formed in a rectangular shape so as to share any one side wall of the settling tank, the lower end is formed in a narrow shape, the separator is installed inside is characterized in that consisting of a separation membrane tank for filtering and discharge the supernatant water flowing from the settling tank .

Here, a flow rate adjusting tank for adjusting the flow rate of the sewage treatment water is provided at the front end of the line mixer.

Here, the settling tank and the separation membrane tank is connected to the sludge discharge pipe for discharging the sludge settled.

Here, the activated carbon recovery apparatus collects granular activated carbon and some of the sludge contained in the sludge into the sludge discharge conduit and feeds it into a conduit connecting the line mixer and the settling tank through a return conduit to use as a seed for flocculation. It is further provided.

Here, the settling tank is provided with a wall or wall of a round or square shape vertically from the upper surface, the stirrer is installed in the center of the upper surface.

Here, at least one outlet for discharging the supernatant to the separation tank is formed at the upper end of any one side wall of the settling tank.

According to the integrated sewage treatment apparatus for the removal of phosphorus in the present invention sewage treatment water configured as described above, by administering a flocculant to the sewage treatment water to aggregate and precipitate the total phosphorus, and maximize the removal of the total phosphorus by solid-liquid separation through the separation membrane, The line mixer, the settling tank and the separation membrane tank can be integrally formed to simplify the configuration and facilitate installation and maintenance.

In addition, according to the present invention by separating the separation membrane tank by the settling tank and the partition wall can be utilized as a cleaning tank for cleaning the chemical of the separation membrane.

1 is a view showing the configuration of a high speed flocculation inclined plate sedimentation apparatus is connected to the conventional rapid settling tank and the slow flocculation tank.
2 is a system diagram showing the configuration of an integrated sewage treatment apparatus for removing phosphorus in sewage treatment water according to the present invention.
Figure 3 is a plan view showing the configuration of the sedimentation tank and separation membrane of the integrated sewage treatment apparatus for removing phosphorus in the sewage treatment water according to the present invention.

Hereinafter, the configuration of an integrated sewage treatment apparatus for removing phosphorus in sewage treatment water according to the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

2 is a system diagram showing the configuration of an integrated sewage treatment apparatus for total phosphorus removal in sewage treatment water according to the present invention, Figure 3 is a sedimentation tank and separation membrane of the integrated sewage treatment apparatus for total phosphorus removal in sewage treatment water according to the present invention. It is a top view which showed the structure.

2 and 3, the integrated sewage treatment apparatus 100 for total phosphorus removal in the sewage treatment water according to the present invention includes a flow rate adjusting tank 110, a line mixer 120, a settling tank 130, It consists of a membrane tank 140 and an activated carbon recovery device 150.

First, the flow adjustment tank 110 adjusts the flow volume of sewage treatment water. Here, the agitator 111 is installed in the flow rate adjusting tank 110, and supplies the sewage treatment water to the line mixer 120 to be described below through the pump 113.

The sewage treatment water is introduced into the line mixer 120, and a coagulant (alum, polyaluminum chloride (PAC), ferric chloride (FeCl 3), and the like) and granular activated carbon as a coagulant are added thereto to mix them rapidly. Here, the line mixer 120 may adjust the injection amount and the inflow rate of the flocculant and the flocculant.

In addition, the settling tank 130 is formed in a rectangular shape, the bottom is formed in a narrow shape, and when the sewage treatment water mixed with the flocculant and granular activated carbon from the line mixer 120 is introduced into the upper portion, the sludge is precipitated while overflowing Discharges supernatant, ie, fresh water Here, the settling tank 130 is provided with a wall or wall 131 of the circular or rectangular shape vertically from the upper surface, the stirrer 133 is installed in the center of the upper surface. Here, at least one outlet 137 for discharging the supernatant to the separation membrane tank 140 to be described later is formed at the upper end of any one side wall 135 of the settling tank 130.

In addition, the separation membrane tank 140 is formed in a square shape so as to share any one side wall 135 of the precipitation tank 130, the bottom is formed in a narrow shape, the separation membrane 141 is installed inside the precipitation tank 130 The filtered supernatant water discharged from the overflow wall 131 is discharged. Here, the separation membrane tank 140 is provided with a backwashing chemical storage tank 143 on the discharge conduit side so that the backwashing chemical is introduced during cleaning.

On the other hand, the sludge discharge pipe 160 for discharging the sludge discharged is installed at the lower discharge side of the sedimentation tank 130 and the separation membrane tank 140, the granular activated carbon and the sludge part contained in the sludge discharge pipe 160 The activated carbon recovery unit 150 is further installed to collect the collected material and to use it as a seed necessary for coagulation by inputting it into a pipeline connecting the line mixer 120 and the settling tank 130 through the conveying pipe 151. In addition, a recovery pump 153 for recovering granular activated carbon and a part of sludge is provided on the sludge discharge conduit 160 which is a front end of the activated carbon recovery device 150.

Hereinafter, an operation of the integrated sewage treatment apparatus for removing phosphorus in sewage treatment water according to the present invention will be described in detail with reference to the accompanying drawings.

First, when the sewage treated water flows into the line mixer 120, the line mixer 120 adds granular activated carbon as a coagulant and a coagulant and rapidly mixes them and discharges them to the settling tank 130.

Then, the sewage treatment water mixed with the flocculant and the granular activated carbon introduced into the sedimentation tank 130 is slowly stirred in the sedimentation tank 130, whereby flocs are formed, and the sludge is precipitated downward.

Then, the supernatant, that is, fresh water flows into the overflow wall 131 of the settling tank 130, and the fresh water is continuously disposed on one sidewall 135 of the settling tank 130 through the discharge port 137. To be discharged.

Then, the separation membrane tank 140 is discharged to the outside by removing the foreign matter and sludge through the separation membrane 141 installed inside, the sludge is precipitated to the bottom.

On the other hand, the sludge at the bottom of the sedimentation tank 130 and the separation membrane tank 140 is discharged to the outside through the sludge discharge pipe 160, a part is recovered to the activated carbon recovery device 150 by the recovery pump 153. do.

In addition, the activated carbon recovery device 150 uses the recovered granular activated carbon and a part of the sludge into a pipe connecting the line mixer 120 and the settling tank 130 through the conveying pipe 151 to be used as a seed for flocculation.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

110: flow adjustment tank 120: line mixer
130: sedimentation tank 140: separation membrane tank
150: activated carbon recovery device

Claims (6)

A line mixer into which sewage treatment water is introduced, and a coagulant and granular activated carbon as a coagulant are introduced to rapidly mix them;
The sedimentation tank is formed in a rectangular shape, the bottom is narrowed, and the sewage treatment water in which the flocculant and the granular activated carbon are mixed from the line mixer is introduced into the upper portion, while precipitating sludge while overflowing the sewage, and discharging the supernatant; And
Sewage is formed in a rectangular shape so as to share any one side wall of the settling tank, the bottom is narrowed, the separation membrane is installed therein is composed of a separation membrane tank for filtering and discharge the supernatant water flowing out of the settling tank Integrated sewage treatment apparatus for removing phosphorus in treated water. The method of claim 1,
In front of the line mixer,
An integrated sewage treatment apparatus for removing phosphorus in sewage treatment water, characterized in that a flow rate adjustment tank for adjusting the flow rate of sewage treatment water is provided. The method of claim 1,
In the settling tank and the membrane tank,
An integrated sewage treatment apparatus for total phosphorus removal in sewage treatment water, characterized in that the sludge discharge pipe for discharging the sludge discharged is connected. The method of claim 3, wherein
The sludge discharge pipe,
Sewage treatment characterized in that the activated carbon recovery device is further provided to recover the granular activated carbon and a part of the sludge contained in the sludge, and put it into a pipe connecting the line mixer and the settling tank through a return pipe to use as a seed for flocculation. Integrated sewage treatment device for removal of phosphorus in water. The method of claim 1,
The settling tank,
An integrated sewage treatment apparatus for total phosphorus removal in sewage treatment water, characterized in that a vertical or circular wall wall is installed in the upper surface, and a stirrer is installed in the center of the upper surface. The method of claim 5, wherein
At the upper end of any one side wall of the settling tank,
Integrated sewage treatment apparatus for total phosphorus removal in the sewage treatment water, characterized in that at least one outlet for discharging the supernatant to the separation membrane tank.

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