JPH09276606A - Method of settling and filtering foul water and tank for settling and filtering sewage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To demonstrate a high clarification performance with simple and small scaled equipment by introducing sewage into a settling and filtering tank, discharging sediment from a bottom and filtering sewage from which the sedi ment has been before being discharged as clarified water. SOLUTION: When foul water such as water from rivers and lakes is treated, the sewage is introduced into a settling and filtering tank 1 from an introducing hose 2 and flow rate is controlled by an introducing valve 2a. A precipitating and flocculating agent is added to the foul water so that flocculated sediment is formed from the sewage, and the sediment is allowed to settle and accumulate on a bottom of the settling and filtering tank 1. The sediment is discharged and separated through a sediment discharging outlet 3 and discharging timing and discharging quantity are controlled by opening and closing a discharging valve 3. Supernatant water after removal of the sediment is made to pass through a screen 4, 4' and filtered with the aid of flow of the foul water continuously introduced through the introducing hose 2 so that water from which fine solid polluting substances are removed is made to flow through a clarified water discharging outlet 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the addition of a flocculating settling agent to sewage, and when the sewage is purified by sedimenting and filtering the pollution-causing substances contained therein, the sewage can be continuously treated in one settling tank. TECHNICAL FIELD The present invention relates to a method for purifying a precipitate and a precipitate filtration tank.

[0002]

2. Description of the Related Art Purifying sewage means separating mud, sludge, etc., which are pollutant-causing substances such as river or lake water or mud at civil engineering sites, from sewage.

Conventionally, sewage containing a flocculating settling agent is allowed to stand in a settling tank for a certain period of time, the pollutant is allowed to settle due to its own weight, and then the tap water is discharged, after which it remains at the bottom of the settling tank. The collected precipitate was collected. In addition, in order to dispose of the collected precipitates such as incineration at a predetermined disposal site, it was suctioned by a vacuum car and transported to the disposal site, or dehydrated by a centrifuge and then transported by a truck or the like.

[0004]

However, it takes a long time for the flocculated pollutant to settle due to its own weight, and the volume of the settling tank should be treated to secure a long residence time. It had to be increased depending on the amount of dirty water.

Further, in the treatment by the vacuum vehicle, continuous suction cannot be performed unless the sedimentation tank is at least two tanks, and a wide space is required as a wastewater treatment facility. On the other hand, when transporting the sediment, suction with a vacuum car sucks a large amount of water together with the sediment, and wasteful labor and cost are spent on the transportation and final disposal at the treatment site, resulting in It was also a cause of lowering the reprocessing efficiency.

[0006]

The present application has been made in view of the above-mentioned problems. Sewage containing a flocculating and precipitating agent is continuously flowed into a settling filtration tank to precipitate a flocculating reaction product, that is, a precipitate. The waste water discharged from the bottom of the filter tank, while the remaining clean water is forcibly filtered by the water pressure generated by the flow in the precipitation tank caused by the inflow of sewage water and the outflow of purified water, thereby purifying the sewage. A method and a settling filter are provided. According to the present invention, the purified water that has been purified through a single treatment step and that is continuously discharged from the settling tank can be directly returned to a river or the like or reused in a factory or the like. In this way, despite its simple and small-scale equipment, it exhibits high purification treatment capacity and purification treatment efficiency,
It solves the above-mentioned problem of collecting only the pollutant contained in the sewage.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A sediment filtration method and a sediment filtration tank thereof according to the present invention will be described with reference to the drawings.

FIG. 1 shows a precipitation filtration method and a precipitation filtration tank according to the present invention. Sewage to be treated is
It flows into the settling tank 1 from the inflow hose 2, and the flow rate is adjusted by the inflow valve 2a. Sewage is introduced continuously or intermittently or in large amounts or in small amounts depending on the type and treated amount of the pollutant causing substance.

The sedimentation filtration method and sedimentation filtration tank according to the present invention can control the sewage treatment capacity depending on the inflow amount, but specifically, the treatment up to 250 Kg / min to 6000 Kg / min is possible. Further, the time from the addition of the sedimentation coagulant to the sewage until the first purified water is obtained is a short time of 1 to 3 minutes depending on the capacity of the pump used.

The wastewater to which the flocculation-sedimentation agent has been added continues to form a flocculation sediment even while staying in the sedimentation filtration tank 1, and is settled by its own weight and deposited on the bottom of the sedimentation filtration tank 1.

The accumulated coagulated sediment can be discharged from the sediment discharge port 3 and separated, and the timing and amount of this discharge can be adjusted by opening and closing the discharge valve 3. The removal of the precipitate (reaction product in the coagulation-sedimentation reaction) also has a secondary effect of promoting the reaction of forming the precipitate in the precipitation filtration tank.

On the other hand, the clean water after removing the precipitate is pushed by the flow of waste water continuously flowing from the inflow hose 2,
It is filtered through screen 4 and screen 4 '.
The number of screens, the roughness of the screen, the interval between the screens, and the like can be appropriately set depending on the type and amount of wastewater to be purified.

Purified water from which fine solid pollution-causing substances have been removed by the screens 4 and 4'is discharged from the purified water outlet 5. The amount of water discharged from the purified water outlet 5 is
It can be adjusted according to the amount of sewage flowing in from the inflow hose 2 and the amount of sediment discharged from the sediment discharge port 3. By adjusting the inflow and outflow rates, the sedimentation filtration tank 1
The residence time of the dirty water inside and the water pressure on the screen 4 can be adjusted. Thus, in the present invention,
By appropriately opening and closing the inflow valve 2a, the purified water outflow valve 5a, and the sediment discharge valve 3a, and adjusting the roughness and the number of meshes of the screen 4, various kinds of pollution-causing substances and the degree of pollution can be obtained in one facility. Can correspond to.

FIG. 2 shows the precipitate discharged from the bottom of the settling tank 1 when the settling precipitate is discharged and removed by a bag 6 for collecting precipitates provided in the precipitate discharge port 3. 1 shows a precipitation filtration method and a precipitation filtration tank to be collected. This bag is preferably made of a water-permeable material and is replaceable. With this bag 6 for collecting precipitates, the precipitate can be handled in bags, and the precipitation filtration method and precipitation filtration tank according to the present invention are suitable for both small-scale processing and large-scale processing.

Further, if the sediment collecting bag 6 is made of a water-permeable material, excess water contained in the sediment can be removed when the sediment is discharged, and a large amount of water can be removed together with the sediment. Wasteful labor and cost for the transportation and the final disposal at the treatment plant can be reduced as compared with the treatment by the vacuum car which sucks.

FIG. 3 shows a precipitation filter tank for filtering the wastewater after discharging the precipitate from the precipitate discharge port 3 through one or more screens. As described above, the number of screens and the roughness of the screen can be set according to the type and amount of waste water to be treated, and the roughness of the screen from the inflow hose 2 side toward the purified water outlet 5 side. By making the value smaller, more efficient processing becomes possible.
Furthermore, by replacing the clogged screen, a constant processing efficiency can be maintained.

The precipitation filtration method and the purification capacity of the precipitation filtration tank according to the present application will be specifically described. The following concentration measurement test was conducted by Muroran Test Analysis Center Co., Ltd. (measurement certification office registered with the Governor of Hokkaido) for water quality survey of river water.

Table 1 shows the measurement results of raw water.

[0019]

[Table 1] Table 2 shows the sediment filtration method for wastewater according to the present application and the measurement results after treatment with the sediment filtration tank.

[0020]

[Table 2] According to the results in the table above, the amount of suspended solids contained in the sewage raw water was 665 mg / l to 4 mg / l due to the treatment of the present application.
Has been reduced to. This difference is so remarkable that it can be visually recognized.

FIG. 4 shows an embodiment of the screen 4. This embodiment is a simple one in which a water-permeable mat is sandwiched between wire nets, and is suitable when the amount of waste water to be treated is small or where the place where it can be used for a sedimentation filtration tank is limited.

One embodiment of the precipitation filter tank 1 shown in FIG.
The bottom of the sedimentation filtration tank is inclined so that the sediment to be discharged is collected in the sediment discharge port 3. The angle of inclination and the size of the precipitate discharge port 3 can be set according to the size and state of the lump of the aggregated precipitate generated.

FIG. 6 shows an embodiment in which the settling filtration tank 1 is of an assembly type. By assembling five panels, which are made of resin such as rubber, as a packing, on the outer edges of the panels so as not to leak water, by the bolts and the U-shaped clip bolt shown in FIG. 7, it is possible to easily assemble. This U-shaped clip bolt is, as shown in FIG.
A crank portion connected to a U-shaped portion formed in a substantially U-shape on the Y surface is a bolt bent in the Z-axis direction. The U-shaped clip bolts and bolts allow the panels to be easily fixed. Further, in this assembly type sedimentation filtration tank, the inflow hose 2, the sediment discharge port 3,
The purified water outlet 5 and the screen 4 can be appropriately provided.

[0024]

Industrial Applicability As described above, according to the present invention, wastewater to which a flocculating settling agent is added is continuously flown into a sedimentation filtration tank, only the sedimented sediment is discharged, and the water is filtered to continuously produce the wastewater. Can be purified. This continuous treatment does not require a facility for storing wastewater for coagulation sedimentation,
Regardless of the amount of sewage, the entire settling process can be done with a single settling filter. In addition, sewage is continuously introduced from one end of the settling filter tank, and purified water is discharged from the other end of the settling filter tank to generate a directional flow in the settling filter tank. To improve its purification efficiency.

By collecting only the precipitate, which is the agglutination reaction product settled from the bottom of the settling filter tank, in a replaceable bag or the like, it is possible to save the labor and cost involved in its transportation and reprocessing.

The type and number of screens and water-permeable bags can be selected and set in accordance with the type of wastewater and the degree of pollution. Therefore, for any wastewater treatment with a single settling tank, for example, factory wastewater, sewage, river or lake water. Alternatively, it can be used to purify seawater, mud and sewage in civil engineering and construction sites, washing water for vegetables, washing water for raw plants and various sewage such as night soil. Furthermore, the present invention is a simple and compact facility,
Since the screen and the water-permeable bag are also removable, the entire equipment can be assembled, and it is suitable for transportation and storage regardless of location for disassembly and assembly.

In the purification treatment of sewage water, the treatment of the pollution-causing substance removed in consideration of the environment and the reduction of the collected water are important issues. ADVANTAGE OF THE INVENTION According to the settling filtration method and settling tank of the wastewater according to the present invention, only the pollutant-causing substance can be quickly and completely removed in one continuous process, and the collected wastewater can be returned as purified water to a river or the like. .

[Brief description of drawings]

FIG. 1 shows a settling filtration tank for wastewater according to the present invention.

FIG. 2 shows an example of a sedimentation filtration tank having a sediment collection bag provided at a sediment discharge port.

FIG. 3 shows an example of a precipitation filtration tank provided with a screen.

FIG. 4 shows an example of a screen.

FIG. 5 shows an example of a settling filter tank with a sloping bottom.

FIG. 6 shows an example of an assembly-type sedimentation filtration tank.

FIG. 7 shows a U-shaped clip bolt for hooking each panel of the assembly-type sedimentation filtration tank.

Claims (16)

[Claims] 1. A method of settling filtration for purifying sewage, comprising injecting sewage into a settling filter tank, discharging a precipitate that has settled from the bottom of the settling filter tank, and removing the sewage after removing the precipitate. A method for precipitating filtration of sewage, which comprises filtering and purifying purified water after the filtration from the precipitation filtration tank. 2. A sedimentation filtration method for purifying sewage, comprising adding a coagulating sedimentation agent to sewage, flowing the sewage after the addition of the coagulation sedimentation agent into a sedimentation filtration tank, and sedimenting from the bottom of the sedimentation filtration tank. A method of settling filtration of wastewater, wherein the precipitate is discharged, the wastewater after removing the precipitate is filtered, and the purified water after the filtration is allowed to flow out from the settling tank. 3. The method for sedimentation filtration of wastewater according to claim 1 or 2, wherein, in the process of flowing the wastewater into the sedimentation filtration tank, the inflowing amount of the wastewater is adjusted to flow in. 4. The method according to claim 1, wherein in the process of discharging the sedimented sediment from the bottom of the sedimentation filtration tank, the discharged sediment is collected in a replaceable, water-permeable bag. The precipitation filtration method described in 3 above. 5. One or more replaceable sewage water after removing the precipitate in the process of filtering the sewage after discharging and removing the sedimented sediment from the bottom of the sedimentation filtration tank. The method of settling filtration according to any one of claims 1 to 4, wherein the filtration is performed using the screen of claim 1. 6. A settling filter for purifying sewage, a means for causing sewage to flow into the settling tank, and a means provided at the bottom of the settling filter for discharging settled precipitate from the settling tank. A means for filtering the wastewater after removing the precipitate, a means for causing the purified water after the filtration to flow out from the precipitation filter tank,
Settling filter tank consisting of. 7. A sedimentation filtration tank for purifying sewage, a means for adding a coagulation-sedimentation agent to sewage, a means for flowing sewage to which the coagulation-sedimentation agent has been added into the sedimentation filtration tank, and the sedimentation filtration tank Means for discharging the sedimented sediment from the sedimentation filtration tank, a means for filtering the sewage after removing the sediment, and a means for discharging the purified water after the filtration from the sedimentation filtration tank. ,
Settling filter tank consisting of. 8. The settling filter according to claim 6 or 7, wherein the means for causing the waste water to flow into the settling filter is adjustable with respect to the inflow amount. 9. The method according to claim 6, wherein the means for discharging the settled precipitate from the settling filtration tank has a container or a bag for collecting the discharged precipitate. Settling filter. 10. The container or bag for collecting the discharged precipitate is made of a water-permeable material.
The settling filter described. 11. The precipitation filtration tank according to claim 9 or 10, wherein a container or bag for collecting the discharged precipitate is replaceable. 12. The precipitation filter tank according to claim 6, wherein the means for filtering the wastewater after removing the precipitate has one or more screens. 13. The settling filter according to claim 12, wherein the screen is replaceable. 14. The settling filter tank according to claim 6, wherein the bottom surface of the settling filter tank for purifying the sewage is inclined so that the settled sediment collects at the discharge means. 15. The settling filter according to claim 6, wherein the settling filter for purifying the wastewater is an assembly type. 16. A sedimentation filter tank for purifying the sewage can be assembled from four or more panels, a plurality of bolts for locking the panels, and a plurality of pins for locking the panels. The sedimentation filter tank according to claim 15, wherein a resin such as rubber is applied to an outer edge of the first panel to prevent water leakage, and the pin is a pin having a crank portion and a U-shaped portion.