KR100700129B1 - Waste Water Treatment System - Google Patents

Abstract

A waste water treatment system is provided to mount an adulteration crushing unit in flow rate control tanks for improving water treatment efficiency and use a dual stage filtering unit formed of sand and gravels, thereby lowering BOD(Biochemical Oxygen Demand) of finally treated water to 7ppm and SS(Suspended Substances) thereof to 7ppm or less. A waste water treatment system includes an adulteration crushing unit(200) having a slant adulteration crushing screen mounted to a wall(22) defining first and second flow rate control tanks(20,30) from each other, and a nozzle mounted at a lower part of the adulteration crushing screen for spraying air along a wall surface of the adulteration crushing screen, so that adulterations of waste water passing through the adulteration crushing screen is crushed. A filtering unit(100) is mounted at an end of the system and filters the treated water via dual layers of a gravel layer and a sand layer, wherein the gravels and sand are reused after cleaning without loss.

Description

Wastewater Treatment System {Waste Water Treatment System}

1 is a cross-sectional view showing a sewage treatment apparatus according to the present invention

FIG. 2 is a view showing a contaminant crushing device of FIG.

3 shows a filtration device.

* Explanation of symbols for main parts of drawings *

10: screen tank 20, 30: flow rate adjustment tank

40: flow meter tank 50, 60, 70: aeration tank

80: settling tank 100: filtration apparatus

110: inflow layer 120: gravel layer

130: sand layer 140; Discharge layer

142: through hole 144: overflow pipe

146: outlet 148: cover

200: contaminant crushing device 210: contaminant crushing screen

220: injection nozzle

The present invention relates to a sewage treatment device, and more specifically, to a flow rate adjusting tank, which includes a waste crushing device using air, and the treated water is filtered and discharged by using a two-stage filtration device of sand and gravel for final treatment. The present invention relates to a sewage treatment apparatus for improving the treatment efficiency so that the BOD of the water is 7 ppm and the SS is 7 ppm or less.

In recent years, eutrophication occurs in rivers and lakes, and red tide occurs in the oceans, polluting water and destroying water resources. The main factors in which eutrophication and red tide occur are organic substances, nitrogen, and phosphorus, which are generated at home and production sites. Wastewater / wastewater is a major factor.

In particular, sewage refers to water containing liquid or solid wastes discharged from flush toilets, baths and kitchens in relation to the daily life of a person. After discharge, it must be discharged.

In this way it looks at the schematic configuration of the sewage treatment apparatus for purifying and discharged sewage.

The conventional sewage treatment apparatus has a screen tank for filtering contaminants having a large specific gravity of sewage, and a flow rate adjusting and metering tank for mitigating flow fluctuations caused by the inflow of sewage through the screen tank and transferring a certain amount of sewage to the aeration tank. , Aeration of a certain amount of sewage through the flow rate adjustment and the metering tank to promote oxidation and digestion by aerobic bacteria, and to remove carbon dioxide, hydrogen sulfide, methane gas, etc. It consists of a sedimentation tank that precipitates contaminants, or sludge, from the water to obtain clean supernatant.

However, in the sewage treatment apparatus, the flow rate adjusting tank usually has sewage, so that anaerobic decay occurs due to a decrease in the amount of dissolved oxygen, which causes odor and deteriorates the quality of the final treated water.

In addition, when the amount of sludge precipitated in the settling tank is too large or not cleaned frequently, the sludge is not sufficiently precipitated in the settling tank, which causes a problem of being discharged as it is.

An object of the present invention for solving the above problems is to provide a contaminant crushing device using air in the flow rate adjustment tank to prevent the anaerobic decay occurs by improving the quality of the treated water due to the crushed contaminants and the amount of dissolved oxygen caused by the air supply The treated water is filtered and discharged using a two-stage filtration device of sand and gravel, which facilitates the cleaning of the filter medium and prevents the outflow of the filter medium, thereby reducing the biological oxygen demand (BOD) of the final treated water. The present invention provides a sewage treatment apparatus that improves treatment efficiency so that 7 ppm and insoluble suspended matter (SS) in water is 7 ppm or less.

A feature of the present invention for achieving the above object is a sewage treatment apparatus comprising a screen tank, a flow adjustment and metering tank, aeration tank, sedimentation tank, the sludge crushing screen is installed inclined inside the flow adjustment tank, At the bottom of one contaminant crushing screen is a sewage treatment apparatus in which a spray nozzle for injecting air along the wall of the contaminant crushing screen is installed to crush the contaminants of filthy water passing through the screen.

In addition, the end of the sewage treatment apparatus is formed in a tubular shape to form an inlet layer, a gravel layer, a sand layer, an outlet layer partitioned by a partition wall through which holes are perforated from the bottom to the top, and an inlet at the bottom of the inlet layer. And the back washing nozzle is installed to the upper side, and a plurality of through holes are drilled at the lower side of the discharge layer, and an overflow pipe is installed at the upper side to the lower side, and a cover having a discharge port formed at the side is spaced apart from the wall surface. Thus, the treated water introduced through the inlet formed in the lower inlet layer is filtered while passing through the gravel layer and the sand layer and discharged through the outlet formed in the upper discharge layer, and the supernatant overflowed by the backwasher during the cleaning through the backwashing tube. And sand is discharged through the overflow pipe and sand is put back through the air hole or cleaned. To A so that the input material is collected to be provided with a filtering device to prevent the loss of the filter material (sand) is not generated.

An embodiment of the present invention having the above characteristics will be described in more detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a sewage treatment apparatus according to the present invention, FIG. 2 is a view showing a contaminant crushing device of Figure 1, Figure 3 is a view showing a filtration device.

The sewage treatment apparatus according to the present invention is largely divided into the screen tank 10, the flow adjustment tank 20, 30 and the flow metering tank 40, the aeration tank 50, 60, 70, sedimentation tank 80 and filtration It comprises a device 100.

In the above-described configuration, the screen tank 10 has a 30 mm bath screen 12 and a 10 mm three screen 14 installed in series to filter out impurities from the introduced sewage.

In addition, the flow regulating tanks 20 and 30 are divided into primary and secondary, and the lower surface of the secondary flow adjusting tank 30 is provided with 32 for supplying oxygen to always supply a small amount of air to anaerobic sewage of sewage. It prevents and maintains the water quality evenly, and is further provided in the inside of the primary flow control tank 20, the debris crusher 200 shown in Figure 2 to circulate the sewage while crushing the contaminants in the sewage to increase the amount of dissolved oxygen, The contaminant crushing device 200 is attached to the wall surface 22 separating the lower half-flow control tank 20, 30, the upper portion is inclined to be spaced apart from the wall surface 22, and a plurality of The horizontal through hole 212 is installed in the lower part of the contaminant crushing screen 210 and the above-mentioned contaminant crushing screen 210 is configured to include a spray nozzle 220 for spraying air along the wall of the contaminant crushing screen 210 do.

In addition, a flow metering tank 40 is installed at the upper portion of the secondary flow adjusting tank 30 so that filthy water is introduced into the aeration tank 50 by a predetermined amount, and microorganisms are formed in the aeration tanks 50, 60, 70. Contact media (52) (62) (72) is installed and aeration pipes (54) (64) (74) are installed at the bottom to contact the microorganism contact media (52) (62) (72). The aeration tanks 50, 60, and 70 are divided into three chambers, and the first half aeration tanks 50, 60 and the sedimentation tank are installed in front of the sedimentation tank 80. It consists of the reaeration tank 70 provided in the back of 80.

The sedimentation tank 80 is formed with a concave lower portion and a sedimentation sludge transfer pipe 80 connected to the first flow rate adjustment tank 20. It is conveyed to the adjustment tank 20, and only the processed water is discharged | emitted without the float by the upper overflowware 84.

And, the rear end of the settling tank 80 is provided with a re-aeration tank 70 provided with the diffuser 74 and the microorganism contact medium 72, the rear end of the re-aeration tank 70 is provided with a filtration device 100. .

As shown in FIG. 3, the filtration device 100 is formed in a tubular shape and spaced by partition walls 114, 124, 134 through which holes 112, 122, 132 are perforated from bottom to top, respectively. The partitioned inlet layer 110, the gravel layer 120, the sand layer 130, and the discharge layer 140 are formed.

The inlet layer 110 has an inlet 116 formed at a lower portion thereof, a reverse nozzle 118 is installed upward, and a through hole 119 is drilled at a side surface thereof.

Gravel 126 and sand 136 is added to the gravel layer 120 and sand layer 130, respectively.

And, the discharge layer 140 is installed so that a plurality of through-holes 142 in the lower side of the side and the overflow pipe 144 on the upper side toward the lower side and the cover 148 formed with the outlet 146 on the side It is installed to be spaced apart from the wall surface (150).

Accordingly, the treated water introduced through the inlet 116 formed in the lower inlet layer 110 is filtered while passing through the gravel layer 120 and the sand layer 130 and then discharged through the outlet 146 formed in the upper outlet layer 140. In the case of cleaning through the backwash nozzle 118, the supernatant and sand overflowed by the backwashing air are discharged through the overflow pipe 144 and then introduced again through the through-hole 142 or sand in the cleaning process. The collection and return to the filtration system should be such that no loss of filter media (sand) occurs.

On the other hand, the inlet 116 is further provided with a transport pipe 160 for transporting the separated sand.

According to the present invention configured as described above BOD concentration of 250ppm or more, SS concentration of 200ppm or more and inflow BOD 5.0kg / day, SS 4kg / day influent water discharged by treating the BOD and SS concentration of 7ppm or less.

At this time, looking at the amount of air required for each group, firstly the primary flow rate adjustment tank 20 60 L / min, the secondary flow rate adjustment tank 30 40 L / min, aeration tanks 50, 60, 70 200 L / min, sedimentation tank 80 requires 40 l / min.

According to the present invention configured as described above, by treating the sewage by the suspension microorganism contact method in the aeration tank, by adjusting the flow rate, the BOD and SS concentration of the discharged water is treated to 7ppm or less, the sewage reduction efficiency is very excellent.

In addition, the wastewater is circulated while crushing the contaminants by the contaminant crushing device in the flow rate adjusting tank, so that anaerobic decay does not occur and the treatment efficiency is improved.

In addition, the filtration device removes contaminants of the final treated water through the double filtration of gravel and sand to improve the purification efficiency, and when the gravel and sand is blown through the backwash nozzle when the gravel and sand is cleaned, the gravel and sand are mixed. The contaminants are discharged to the top, and the sand discharged through the overflow pipe can be collected and reused in the cleaning process, thereby improving the use efficiency of the filter medium and improving the purification efficiency.

Claims (3)

In the sewage treatment apparatus comprising a screen tank, a flow control tank, a flow metering tank, aeration tank, sedimentation tank, Sewage treatment device is installed inclined to the inside of the flow rate adjustment tank, and the spray nozzle for injecting air along the wall of the crushed crushed screen to the lower part of the crushed crushed screen. In the sewage treatment apparatus comprising a screen tank, a flow control tank, a flow metering tank, aeration tank, sedimentation tank, The end of the sewage treatment apparatus is formed in a tubular shape to form an inlet layer, a gravel layer, a sand layer, an outlet layer in which the space is partitioned by a partition wall through which holes are perforated from bottom to top, and an inlet is formed at the bottom of the inlet layer. The back washing nozzle is installed toward the upper side, and the discharge layer is installed so that a plurality of holes are drilled at the lower side of the side, and an overflow pipe is installed at the upper side toward the lower side, and a cover formed with an outlet at the side is spaced apart from the wall surface. Sewage treatment apparatus, characterized in that to install the device. Screen, A flow regulating tank having a sludge crushing screen installed obliquely therein, and a spray nozzle for injecting air along the wall of the crushing crushing screen at the lower part of the crushing crushing screen; Flow metering tank connected to the flow adjusting tank, Aeration Tank, Sedimentation Tank, It is installed at the end of the sewage treatment process, and is formed in a tubular shape to form an inflow layer, a gravel layer, a sand layer, and an outlet layer partitioned by a partition wall having perforated holes from the bottom to the top, and an inlet at the bottom of the inflow layer. The back washing nozzle is installed to the upper side, and a plurality of through holes are drilled at the lower side of the discharge layer, and the overflow pipe is installed at the lower side of the upper side, and the cover having the outlet is formed at the side so that the side is separated from the wall surface. Sewage treatment apparatus comprising a filtration device.

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