KR100360535B1 - Apparatus for wastewater treatment - Google Patents

Abstract

The present invention relates to a wastewater treatment apparatus, comprising a sedimentation and oil-water separation tank (100) configured to separate oil and fine particles in the introduced wastewater by gravity, and the wastewater introduced from the sedimentation tank and the oil-water separation tank (100) at a predetermined water level. A water tank 200 for temporarily storing the water while maintaining it, and the waste water pumped from the water tank 200 is stored in the chemical supply tank 500 and then chemically reacts with a chemical supplied from the chemical supply pump 510. Line mixer 300 to form particles, a filter 400 which is supplied with wastewater containing the particles and is separated into particles containing contaminants and treated water, and is embedded in the filter 400 to contaminate the contaminants. The filter medium 410 for filtering the filter, a blower 600 for supplying air for separating the particles filtered between the filter medium 410, and the particle-sludge- separated from the filter medium by the blower 600 to the bottom is dewatered. artillery Dehydration apparatus 700 that was separated after dehydration using, and the treated water separated from the filter 400 is composed of a recycling tank 800 that can be used as reused water for washing, located in the downtown It is installed in a narrow place such as a car wash, and it is an effective and single-use wastewater treatment device.

Description

Apparatus for wastewater treatment

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment apparatus, and more particularly, to an improved wastewater treatment apparatus for effectively treating contaminants in car wash wastewater generated in a car wash in a downtown area.

With the recent development of the industry, air pollution is also a problem during the operation of vehicles as logistics increases and vehicle usage increases, but water pollution caused by the deterioration of water quality due to the discharge of wastewater generated by car washing into sewage is gradually increasing. It is an environmental problem.

Car wash wastewater generated when washing such a vehicle deteriorates the water quality due to various pollutants included even though it contains less pollutants than industrial wastewater generated in various industrial facilities. ) Increases COD (Chemical Oxygen Demand) and increases SS (Suspended Solids) by soil or dirt generated during car washes. The pH is increased or decreased by chemicals to make it acidic or alkaline, and the anionic surfactant is generated on normal-hexane (n-HEXANE) extract material and detergent used in car wash by oil or wax attached to car during car wash. have.

Approximate concentrations of pollutants generated during such car washes and emission limit standards by the Korean Environmental Law are shown in Table 1 below.

division Expected emission concentration Emission allowance standard Trigger Remarks Clean area "Go" area "Me" area JH 7 to 8 5.8-8.6 5.8-8.6 5.8-8.6 Chemicals COD 130 to 200 50 90 130 Detergent, wax Ss 100-200 40 80 120 Earth and sand N-H Extract 5 to 10 One 5 5 Oil, Detergent, Wax Anionic surfactant 3 to 10 3 5 5 Detergent

At present, as shown in Table 1, most wastewater treatment devices mainly used to treat car washes require not only a large space but also require trained professional management personnel to operate these devices. Moreover, there was a problem that these wastewater treatment devices are difficult to operate.

Accordingly, the present invention is to solve the above problems, while providing a car wash wastewater treatment apparatus to increase the treatment capacity while requiring less installation area to be installed in the car wash located in the city center, easy to manage according to its operation. The purpose is.

Wastewater treatment apparatus of the present invention for achieving the above object, the sedimentation and oil-water separation tank to separate the oil and fine particles in the incoming wastewater by gravity, and the wastewater introduced from the sedimentation tank and oil-water separation tank to a certain level A water tank which temporarily stores and maintains the wastewater, a line mixer in which waste water pumped from the water tank is stored in a chemical supply tank and chemically reacts with a chemical supplied from a chemical supply pump to form particles, and a wastewater including the particles. A filter which is supplied and filtered to separate particles containing contaminants and treated water, a filter which is built in the filter to filter contaminants, and a blower which supplies air for separating the filtered particles between the filters, Particles-sludge- separated from the media by blower to the lower part were dehydrated using a dehydration bubble and then separated. Is to the dewatering device and waste water treatment apparatus take introducing a number of separation from the said filter, consisting of a recycled water tank made available to be reused for washing.

The wastewater treatment apparatus of the present invention having such a configuration effectively treats the car wash wastewater in a very narrow installation space.

1 is a block process diagram showing a wastewater treatment apparatus according to the present invention;

2 is a flow chart schematically showing a wastewater treatment apparatus according to the present invention.

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

100: sedimentation and oil and water separation tank 200: water collection tank

300: line mixer 400: filter

500: chemical agent 600: blower

700: dehydration device 800: reuse water tank

Hereinafter, with reference to the accompanying drawings, an embodiment of the present invention will be described in detail.

1 is a view showing a process block diagram of a wastewater treatment apparatus according to the present invention, Figure 2 is a view showing a schematic configuration of the wastewater treatment apparatus according to the invention, gravity and oil particles in the incoming wastewater gravity The sedimentation and oil water separation tank 100 to be separated by, and the water collection tank 200 to temporarily store the waste water introduced from the sedimentation tank and oil water separation tank 100 while maintaining a constant water level, pumped from the water collection tank 200 The wastewater is stored in the chemical supply tank 500 and is chemically reacted with the chemical supplied from the chemical supply pump 510 to form particles. The filter 400 which is separated by the particles containing the material and the treated water, the filter medium which is built in the filter 400 to filter contaminants, and separates the filtered particles between the filter medium 410 Above Blower 600 for supplying a single air, the dewatering apparatus 700, and the filter 400 to be separated after dewatering the particles-sludge- separated from the media by the blower 600 by using a dehydrator. Received from the treated water separated from the recycled water tank 800 that can be used as a reuse water wash.

When explaining the operation method of the present invention step by step

(Iii) Sludge discharge step: the water collecting tank 200 temporarily stores the pre-washed wastewater introduced through the sedimentation and oil-water separation tank 100 to perform the flow adjustment and buffer role. When a large amount of wastewater enters, it temporarily stores it to mitigate impact loads, while also acting as a buffer to keep the wastewater treatment system running at a constant speed.

Therefore, the pump 220 installed inside the sump tank 200 detects the position of the water surface of the sump tank as "up and down" and operates by a level gauge sensor (LEVEL GAUGE SENSOR, 220) to operate when the water level becomes high. This automatically starts to operate, first, when the water level of the sump tank 200 becomes higher and the water level gauge sensor 220 detects, the automatic valve 440 of the lower line of the filter 400 opens to the lower hopper portion of the filter 400. Sludge accumulated in the discharged to the dehydration apparatus 700, the automatic valve 440 is automatically closed by the automatic valve timer 450 after a predetermined time.

(Ii) Media rinsing step: When the automatic valve 440 of step (iii) is closed, the raw water transfer pump 210 of the sump tank 200 operates to operate the 3-way automatic valve timer 430 for an initial predetermined time. In order to remove some remaining contaminants in the inner filter medium 410 of the filter 400, the 3-way automatic valve 420 of the discharge line is opened in the drain direction to flow into the oil / water separation tank 100 for reprocessing.

(Iii) Chemical reaction and particle filtration step: After the rinsing step is completed, the 3-way automatic valve 420 is opened in the discharge line direction by the operation of the 3-way automatic valve timer 430 and at the same time the chemical supply tank 500 The chemical is introduced into the filter 400 by chemical reaction with the wastewater in the line mixer 300 by the supply of the chemical supply pump 510.

Meanwhile, unlike the conventional downflow filter, the filter 400 uses a floating filter 410. The filter 410 is a foamed polystyrene resin (EPS) having a size of about 1 to 2 mm and a specific gravity of about 0.3. 400) the wastewater flows in from the lower side, and the wastewater flows upwardly and is filtered so that the water level gauge 220 performs filtration until the water tank level is sensed to be lower, and the water level gauge 220 is lower. When detecting the raw water feed pump 210 and the chemical supply pump 510 is stopped and the 3-way automatic valve 420 of the discharge line is also closed, the main reaction process chemical reaction and filtration process is finished.

(Iii) Filter backwashing step: Backwashing to desorb contaminant particles filtered between the filter media 410 of the filter 400 is started. The start of backwashing is when the water level level gauge 220 of the sump tank 200 detects a lower part, the operation of the raw water supply pump 210 stops and the blower 600 is operated to introduce air into the filter 400. , The blower timer 610 by desorbing the aggregated particles attached to the media in the water for a predetermined time and the blower 600 is stopped. When the blower 600 stops operating, the aggregated particles detached from the filter medium 410 are deposited into the lower hopper part of the filter 400, and the cleaned filter material is raised to the upper portion, and the back washing is also finished.

When the step (ⅳ) is repeated in this step (처리) is processed continuously and the treated water of the filtration tank 400 is introduced into the reuse tank 700 is reused in the car wash and when the water level of the reuse tank 700 is higher By minimizing the use of water by discharging, and installing the wastewater treatment apparatus of the present invention, the minimum civil engineering structures such as various tanks and plumbing facilities are installed in the basement, if only the minimum management facilities on the ground, the installation area It can be minimized.

The pilot plant was manufactured with the configuration of FIG. 2 and tested as follows.

Wastewater is precessed wastewater, the average concentration of pollutants was 170mg / l for chemical oxygen and 170mg / l for suspended solids.

Experimental Example 1. Removal efficiency according to the property of EPS

In the test conditions, the filter wire velocity was set at 20 m / H, and the dose of the drug was 0 mg / l.

division Suspended solids (SS) Remarks Concentration (mg / l) Removal efficiency (%) Diameter 3 ~ 4mm Specific gravity 0.032 77 55 1-2 mm diameter 0.032 58 66 3 to 4 mm diameter 0.3 56 67 1 to 2 mm diameter 0.3 44 74

Experimental Example 2. Removal Efficiency According to Filtration Line Speed

Test conditions were selected as the size of the filter medium to 1 ~ 2mm and the specific gravity is about 0.3, and the results of the experiment without the chemical input amount is shown in Table 3 below.

Filtration linear velocity (m / H) Suspended solids (SS) Remarks Concentration (mg / l) Removal efficiency (%) 40 77 55 30 49 71 20 44 74 10 41 76

Experimental Example 3. Removal Efficiency According to Chemical Dose

The test conditions were the same as in Experimental Example 2, the filter medium, the filter line speed to 30m / H and the results are shown in Table 4 below.

Drug amount (mg / l) Chemical oxygen demand (COD) Suspended solids (SS) Remarks Concentration (mg / l) Removal efficiency (%) Concentration (mg / l) Removal efficiency (%) 0 139 18 49 71 20 107 37 24 86 50 90 47 17 90 100 87 49 15 91

As can be seen from the above test results, it can be seen that the wastewater treatment can be appropriate to the emission standard if the chemical input amount is adjusted according to the filter line speed and the media type is properly adjusted.

Wastewater treatment apparatus of the present invention can be configured in a compact system can be installed enough in a small installation space, unlike the conventional method can be treated with a small amount of a single drug, so reducing the drug use costs and the amount of sludge generated accordingly This reduces post-processing costs. In addition, since the wastewater treatment operation is automatically operated, maintenance is also easy because there is no need for a manager to reside.

In addition, the water required for car wash can be recycled and recycled by itself, thereby minimizing the use of water, thereby preventing environmental pollution, and the facility is simple and compact, requiring a small footprint.

Claims (2)

Sedimentation and oil and water separation tank 100 to separate the oil and fine particles in the incoming waste water by gravity, and the water collection tank for temporarily storing the waste water introduced from the sedimentation tank and oil and water separation tank 100 while maintaining at a constant water level ( 200), the wastewater pumped from the sump tank 200 is stored in the chemical supply tank 500 and chemically reacts with the chemical supplied from the chemical supply pump 510 to form particles. A filter 400 which is supplied with a wastewater containing the particles and is separated into particles containing contaminants and treated water, and a filter 410 which is built in the filter 400 to filter contaminants. Blower 600 for supplying air for separating the filtered particles between the 410, the particles-sludge-separated from the media by the blower 600 to the lower by dehydration using a dewatering bubble to separate mask Water device (700), wastewater treatment device consisting of a recycling water tank (800) that can be used as reused water to wash the inflow of the treated water separated from the filter (400). According to claim 1, In order to operate the wastewater treatment apparatus, (Ⅰ) When the level gauge (LEVEL GAUGE SENSOR, 220) of the sump tank 200 detects the upper water level, the automatic valve 440 of the lower line of the filter 400 is opened, which is deposited on the lower hopper of the filter 400. Sludge is discharged to the dewatering device 700, the automatic valve 440 is a sludge discharge step is automatically closed after a predetermined time by the automatic valve timer 450, (Ii) When the automatic valve 440 of the lower portion of the filter 400 is closed, the raw water transfer pump 210 of the water collecting tank 200 operates to operate the 3-way automatic valve timer 430 for an initial predetermined time. Filter rinsing step of opening the 3-way automatic valve 420 of the discharge line in the drain direction in order to remove the contaminants remaining in the internal filter 410 of 400 to flow into the oil water separation tank 100 to be reprocessed, (Iii) When the rinsing step is completed, the 3-way automatic valve 420 is opened in the discharge line direction by the operation of the 3-way automatic valve timer 430, and at the same time, the chemical in the chemical supply tank 500 is supplied with the chemical supply pump 510. The chemical reaction with the waste water in the line mixer 300 is supplied to the filter 400 by the supply of), and the filter 400 uses a floating filter 410 unlike the conventional downflow filter. The filter medium 410 is a foamed polystyrene resin (EPS) having a size of about 1 to 2 mm and a specific gravity of about 0.3. The waste water flows from the lower part of the filter 400 to the lower part of the filter 400 so that the waste water flows upward. The chemical reaction and particle filtration step to perform the filtration until the water level gauge (220) detects the water tank level as a lower level, (Iii) Backwashing is started to desorb contaminant particles filtered between the filter medium 410 of the filter 400. The start of backwashing is when the water level level gauge 220 of the sump tank 200 detects the lower part, the raw water transfer pump 210 stops operation and at the same time the blower 600 is operated to introduce air into the lower part of the filter 400. , The blower timer 610 by desorbing the aggregated particles attached to the media in the water for a predetermined time and the blower 600 is stopped. When the blower 600 stops operating, the aggregated particles detached from the filter medium 410 are deposited into the lower hopper part of the filter 400, and the cleaned filter medium is floated to the upper portion, and the backwashing operation is also completed. Waste water treatment apparatus, characterized in that using the method.