KR20040048679A - Wastewater treatment device and method using module type filtration equipment - Google Patents

Abstract

PURPOSE: Provided are an apparatus and a method of treating wastewater using a module-type filter being comprised of filter member and an ejector for air-back washing. CONSTITUTION: The apparatus comprises a raw water tank(10); a pump(20) for pumping up raw water of the raw water tank(10) to a filter; a module-type filter(30) which includes an ejector(31) for supplying air introduced from an air duct(34) to a filter for air-back washing using the pump(20), suspended filter members(32), and a strainer(33) for keeping the suspended filter members(22); a treated water tank(40) installed above the module-type filter(30) for storing filtrate of the filter(30) during filtration and supplying the treated water to the filter(30) during backwashing; and a discharge pipe(50) for discharging pollutant from the filter(30).

Description

Wastewater treatment device and method using module type filtration equipment

The present invention relates to a wastewater treatment apparatus used for advanced treatment of effluents in wastewater treatment plant and pretreatment for reuse of wastewater. ; Modular treatment device for air backwashing by installing ejector for air back-up in modular filtration device filled with floating media such as EPP), sand, activated carbon, or fiber sand. By being located in the upper part of the filtration device, it is possible to reduce the investment cost and operating cost by eliminating the need for a back-flushing fan and a back-wash pump, and the modular filtration device, which can easily increase the capacity because of the modular filtration device, can stably supply the treated water quality. It relates to a wastewater treatment apparatus using.

The present invention also relates to a treatment method and a backwashing method of the above wastewater treatment apparatus employing a modular filtration device, an ejector for backwashing air, and a treatment tank disposed at the top for the downflow water backwashing.

In the conventional filtration apparatus, sand was used as a filter medium, but sand filtration has a small particle size of 0.3 to 1.2 mm, so that the filter differential pressure is increased by clogging the filter medium easily due to turbidity and suspended substances, and thus backwashing periodically. Should be. However, the air backwashing and the water backwashing require a backwashing blower and a backwashing pump, and thus, there is a problem in that the initial investment cost and the operating cost are high, resulting in poor economic efficiency.

The present invention is to solve the problems of the prior art as described above, an object of the present invention, such as EPP to prevent clogging of the filter due to suspended matter, turbidity, microbial flocs contained in the sewage water Modular filtration device filled with floating media, sand, activated carbon or fiber yarn, ejector for air backing located in the lower part of the modular filtration device, and modular filtration device for natural flow downflow water backwash By adopting the treatment tank located on the outside, there is no need for a back-flushing fan and back-flushing pump to simplify the installation, and as a result, to provide a wastewater treatment apparatus using a modular filtration device that can reduce initial investment and operating costs. .

Another object of the present invention is to provide a treatment method and a backwashing method of the wastewater treatment apparatus employing a modular filtration device, an ejector for backwashing air, and a treatment tank disposed at the top for downflow water backwashing. will be.

1 is a modular filtration device employing a modular filtration device using a floating filter, air backwash using an ejector, and a natural flow downflow water backwash using the water level of the treatment tank according to an embodiment of the present invention. The treatment system diagram schematically showing the wastewater treatment system and treatment method used.

* Description of the symbols for the main parts of the drawings *

10: raw water tank 20: raw water pump

30: modular filtration device 31: ejector

32: floating media 33: strainer

34: Songpungro 40: Treatment tank

50: drainage

In order to achieve the object as described above, the wastewater treatment apparatus using a modular filtration device according to the present invention, a raw water tank into which raw water is introduced; A raw water pump which is a power source for introducing raw water from the raw water tank into a filtration device; A modular filtration device in which raw water is introduced from the raw water pump, and when the back of the filtration device is used, the ejector installed in the lower part of the filtration device for backwashing the air by introducing external air from the air blower using the raw water pump, and a floating type. A modular filtration device comprising a filter medium and a strainer positioned above the filter medium filling layer of the filter device to trap the floating filter medium; Located in the outer upper portion of the filtration device, and stores the water filtered through the filtration device, the backwashing treatment tank for introducing the treated water into the modular filtration device when backwashing; And a drainage channel connected to the filtration device to discharge the pollutants discharged from the filtration device.

In the wastewater treatment apparatus using the modular filtration device according to the present invention, the modular filtration device is attached to the inner wall of 1 to 20 O-rings having a thickness of 1 to 10 mm, width 1 to 10 mm at intervals of 3 to 30 cm It is characterized by.

In the wastewater treatment apparatus using the modular filtration device according to the present invention, the floating media filled in the filtration device is selected from the group of expandable materials consisting of expanded polypropylene, expanded polystyrene, and expanded polyethylene.

In addition, the wastewater treatment apparatus using a modular filtration device according to the present invention, a raw water tank into which raw water is introduced; A raw water pump which is a power source for introducing raw water from the raw water tank into a filtration device; A modular filtration device in which raw water is introduced from the raw water pump, and when the back of the filtration device is used, the ejector, sand, installed in the lower part of the filtration device to backwash the air by introducing external air from the air blower using the raw water pump, A modular filtration device including a filter selected from activated carbon or fiber yarn, and a strainer positioned above the filter filler layer of the filter device to trap the filter material; A treatment tank for storing the water filtered through the filtration device; And a drainage channel connected to the filtration device to discharge the pollutants discharged from the filtration device.

Wastewater treatment method using a modular filtration device according to the present invention, the wastewater treatment method using a modular filtration device, the step of storing the wastewater of the wastewater treatment plant in the raw water tank; (B) feeding the raw water of the raw water tank using a raw water pump and then rapidly mixing and aggregating aluminum sulfate or polyaluminum chloride as a flocculant; After administering the coagulant of step (b), performing upflow filtration with a modular filtration device having a strainer-supported media filling layer (c); And storing (d) the final treated water filtered in step (c) in a treatment tank located above the modular filtration apparatus.

In the wastewater treatment method using the modular filtration device according to the present invention, the filter medium filled in the filtration device of the step (c) is a floating type selected from the group of expandable materials consisting of expanded polypropylene, expanded polystyrene, and expanded polyethylene. It is characterized in that any one selected from media, sand, activated carbon, or fiber yarn.

The backwashing method of a wastewater treatment apparatus using an air backwashing process and a downflow water backwashing process according to the present invention is a backwashing method of a wastewater treatment apparatus using a modular filtration apparatus, and is located at the bottom of a modular filtration apparatus filled with floating media. (A) backwashing the floating media filling layer by introducing external air using an installed ejector and a raw water pump; (B) introducing a treatment water from the upper portion of the modular filtration apparatus by a natural flow using the head of the treatment tank located on the outer upper portion of the modular filtration apparatus to backwash water; And (c) discharging the desorbed contaminants to the drainage through the bottom of the modular filtration apparatus.

In the backwashing method of a wastewater treatment apparatus using an air backwashing process and a downflow water backwashing process according to the present invention, the floating media filled in the filtration device of step (a) is expanded polypropylene, expanded polystyrene, and expanded polyethylene. It is characterized in that it is selected from the group of foamable materials to be configured.

The backwashing method of a wastewater treatment apparatus using an air backwashing process according to the present invention is a backwashing method of a wastewater treatment apparatus using a modular filtration apparatus, and includes a filter medium filled with media selected from sand, activated carbon, or fiber yarn. (A) backwashing the media filling layer by introducing external air using an ejector and a raw water pump installed in the lower portion; And (b) discharging the desorbed contaminants to the drainage channel through the lower portion of the modular filtration apparatus.

Hereinafter, the present invention will be described in detail by taking an example of a filtration device filled with a floating-type filter medium using an EPP that is a spherical foamable material.

In the wastewater treatment apparatus of the present invention, the fluid maintained at a high pressure by the raw water pump has a high flow rate and a low pressure while maintaining the vacuum state while passing through the nozzle of the ejector. After vigorously mixing with the fluid, small bubbles are injected into the interior of the modular filtration device.

The sprayed air bubbles are moved upward by the buoyancy of their own and pass between the floating media, forming a strong turbulence and collision between the media and removing the contaminants attached to the media.

The air backwashing using this ejector is equally applicable to not only a filtration apparatus using floating media, but also a filtration apparatus using a filtrate made of particles such as sand filtration, adsorption of activated carbon, and a filtration apparatus using fiber yarn.

The present invention performs the backwash in a natural flow type using the potential energy by the water level of the treatment tank located above the modular filtration apparatus after the air backwash is completed. In particular, by backwashing in a downflow manner, the turbidity-inducing substance attached to the filter medium can be removed in the direction of the particle weight of the particles, thereby improving the backwashing efficiency. The conventional general filtration apparatus which performs the backwash in the upflow type performs the backwash in the direction opposite to the self-weight direction of the turbidity-causing substance, so that the filtration process is performed without the turbidity substance being removed through the overflow trough. The upper part of is rapidly occluded. As a result, the differential pressure rises rapidly and the backwash cycle is shortened, making stable operation difficult.

The present invention applies the ejector to the air backwash of the modular filtration device by the floating filter medium, and by performing the water backwash in a downflow flow by natural flow, eliminating the installation of the backwash blower and backwash pump required for the existing filtration device Initial investment costs and operation costs can be reduced.

In addition, O-rings having a thickness of 1 to 10 mm, a width of 1 to 10 mm, preferably a thickness of 2 to 5 mm, and a width of 2 to 5 mm are attached to the inner wall of the modular filtration apparatus, so that the suspended particles in the filtration process. Do not allow them to easily drain into the treated water on the inner wall. The O-ring attachment position may be anywhere on the inner wall of the filter, but the spacing is 3-30 cm, preferably 5-20 cm, and the number is preferably 1-20.

Since the filtration device is a modular module of the same standard, it is possible to expand the processing capacity by installing up to 1 to 100 units according to the processing capacity.

1 is a view illustrating a wastewater treatment apparatus using a modular filtration apparatus according to the present invention, in which a filtration apparatus is filled with floating media using EPP, which is a spherical foam material.

As shown in FIG. 1, in the wastewater treatment method using the modular filtration apparatus according to the present invention, first, the target wastewater of the wastewater treatment plant is stored in the raw water tank 10 and pumped using the raw water pump 20. At this time, the raw water pump may be a centrifugal pump, a diaphragm pump, a vortex pump and the like. Thereafter, a flocculant such as aluminum sulfate or polyaluminum chloride is added to rapidly mix and agglomerate, and the upflow type filtration is performed using a modular filtration device 30 having a packed bed of the floating media 32 supported by the strainer 33. To remove turbidity, suspended solids and microbial flocs contained in raw water. After filtration, the final treated water is stored in the treated water tank 40 located at the top outside the modular filtration device.

After a certain time of operation, when the packed bed occluded by the contaminants of the raw water reaches a predetermined pressure difference, the backwashing process of the wastewater treatment apparatus using the air backwashing process and the downflow water backwashing process is performed. Backwashing consists of air backwashing and water backwashing. In the air backwashing step, the raw water is introduced through the ejector 31 by operating the raw water pump 20 and external air is introduced from the lower portion of the modular filtration device 30 and floated. The turbidity and suspended solids are effectively detached from the surface of the media by the collision between the media and the turbulence and vibration caused by the flow of air.

In the next step of water backwashing, the treated water flows from the upper portion of the modular filtration device 30 in a natural flow by the water level of the treatment tank 40 located higher than the modular filtration device, and the backwash is carried out in the downstream. The backwashing process and the suspended matter separated by the discharged to the drain through the lower portion of the modular filtration device 30 is completed backwashing process.

As described above, the air backwash ejector used in the present invention can be applied not only to a filtration device using the floating filter medium, but also to a filtration device using filtrate or fibrous material composed of particles such as sand filtration and adsorption of activated carbon.

Hereinafter, the configuration and the effects of the present invention will be described in more detail with reference to Examples. The following examples illustrate the content of the invention, but the content of the invention is not limited thereto.

<Example 1>

In this embodiment, as shown in Fig. 1, six O-rings having a thickness of 3 mm and a width of 3 mm were attached to the inner walls of four cylindrical modules having a diameter of 20 cm and a height of 200 cm at intervals of 20 cm. The EPP, which is a floating media supported by a 3 mm size strainer, was filled to a depth of about 120 cm, an ejector was installed at the bottom, and the whole filtration process was performed by introducing wastewater using a centrifugal pump.

Although the present invention has been described in detail with reference to the drawings and embodiments shown, it will be apparent to the inventors that various modifications and changes are possible within the scope and spirit of the present invention, and such modifications and modifications are attached thereto. It is also natural that the claims belong.

As described above, in the existing filtration apparatus, a blower is required to perform air backwashing, and a backwash pump is required to carry out water backwashing, but the wastewater treatment apparatus using the modular filtration apparatus of the present invention. By installing an ejector inside the modular filtration apparatus, and introducing air using a raw water pump used in the filtration process to perform air backwashing, a conventional blower is unnecessary, and a treatment tank installed at the top of the modular filtration apparatus. By performing water backwashing using the natural flow type using the water level, the conventional backwash pump is unnecessary, so that the investment cost and the operating cost can be reduced.

In addition, since the filtration apparatus used in the wastewater treatment apparatus of the present invention is a modular filtration apparatus, it is possible to easily increase the capacity and stably supply the treated water quality.

Claims (9)

A raw water tank into which raw water flows; A raw water pump which is a power source for introducing raw water from the raw water tank into a filtration device; A modular filtration device in which raw water is introduced from the raw water pump, and when the back of the filtration device is used, the ejector installed in the lower part of the filtration device for backwashing the air by introducing external air from the air blower using the raw water pump, and a floating type. A modular filtration device comprising a filter medium and a strainer positioned above the filter medium filling layer of the filter device to trap the floating filter medium; Located in the outer upper portion of the filtration device, and stores the water filtered through the filtration device, the backwashing treatment tank for introducing the treated water into the modular filtration device when backwashing; And The sewage treatment apparatus using a modular filtration device is connected to the filtration device and comprises a drainage channel for discharging the pollutants discharged from the filtration device. The method of claim 1, The modular filtration device is a wastewater treatment apparatus using a modular filtration device, characterized in that 1 to 20 O-rings having a thickness of 1 to 10 mm, width 1 to 10 mm attached to the inner wall at intervals of 3 to 30 cm. The method of claim 1, Floating filter medium filled in the filtration device is a wastewater treatment apparatus using a modular filtration device, characterized in that selected from the group of the expandable material consisting of expanded polypropylene, expanded polystyrene, and expanded polyethylene. A raw water tank into which raw water flows; A raw water pump which is a power source for introducing raw water from the raw water tank into a filtration device; A modular filtration device in which raw water is introduced from the raw water pump, and when the back of the filtration device is used, the ejector, sand, installed in the lower part of the filtration device to backwash the air by introducing external air from the air blower using the raw water pump, A modular filtration device including a filter selected from activated carbon or fiber yarn, and a strainer positioned above the filter filler layer of the filter device to trap the filter material; A treatment tank for storing the water filtered through the filtration device; And The sewage treatment apparatus using a modular filtration device is connected to the filtration device and comprises a drainage channel for discharging the pollutants discharged from the filtration device. Wastewater treatment method using a modular filtration device, (A) storing the target wastewater of the wastewater treatment plant in a raw water tank; (B) feeding the raw water of the raw water tank using a raw water pump and then rapidly mixing and aggregating aluminum sulfate or polyaluminum chloride as a flocculant; After administering the coagulant of step (b), performing upflow filtration with a modular filtration device having a strainer-supported media filling layer (c); And And (d) storing the final treated water filtered in the step (c) in a treatment tank located above the modular filtration device. The method of claim 5, The filter medium filled in the filtering device of step (c) may be any one selected from flotation media, sand, activated carbon, or fiber yarns selected from the group of expandable materials including expanded polypropylene, expanded polystyrene, and expanded polyethylene. Wastewater treatment method using a modular filtration device characterized in that. As a backwashing method of sewage treatment system using a modular filtration device, (A) backwashing the floating media filling layer by introducing external air by using an ejector and a raw water pump installed in the lower portion of the modular filtering apparatus filled with the floating media; (B) introducing a treatment water from the upper portion of the modular filtration apparatus by a natural flow using the head of the treatment tank located on the outer upper portion of the modular filtration apparatus to backwash water; And A method for backwashing wastewater treatment apparatus using an air backwashing process and a downflow water backwashing process comprising the step of (c) discharging the contaminant which has been detached to a drainage channel through a lower portion of the modular filtration apparatus. The method of claim 7, wherein The floating media filled in the filtration device of step (a) is selected from the group of foamed materials consisting of expanded polypropylene, expanded polystyrene, and expanded polyethylene, and wastewater using an air backwashing process and a downflow water backwashing process. Backwashing method of processing unit. As a backwashing method of sewage treatment system using a modular filtration device, (A) backwashing the filter medium filling layer by introducing external air by using an ejector and a raw water pump installed in a lower portion of the modular filtration device filled with filter medium selected from sand, activated carbon, or fiber yarn (a); And Backwashing the wastewater treatment apparatus using an air backwashing process comprising the step of (b) discharging the contaminated desorbed material through the lower portion of the modular filtration device.