JPH031078B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewage treatment apparatus, and particularly to a clarifier having a gap for removing oil and grease in an oxidation waterway.

Circulating waterways or oxidation waterways are used to remove sugars and other carbohydrates, proteins and other nitrogen compounds, and other pollutants from domestic wastewater, industrial wastewater, and the like.

Generally, circulating sewage treatment equipment has an elongated tank. The tank consists of two side walls and at least one bulkhead. This bulkhead is disposed vertically within the tank and approximately parallel to the two side walls. Moreover, since this partition wall is arranged at a distance from the end of the tank, a circulation type waterway or an oxidation waterway is formed, and a portion of the wastewater is retained in this waterway. In conventional oxidation waterway devices, wastewater is constantly allowed to flow through the waterway and at the same time aeration is performed to decompose pollutants using microorganisms. An example of such a device is U.S. Pat.
There is one disclosed in No. 3846292. In this example, the wastewater present in the waterway is removed after aeration and transferred into a conventional clarifier.
Heavy solid particles are separated and removed within this clarifier. Since such treatment equipment is expensive, equipment in which a clarifier is placed in the waterway has been developed. One example is the device disclosed in US Pat. No. 4,303,516.

However, in these devices, the separation step increases the cost of the water channel and the clarifier, and also causes turbulence in the clarifier, so the efficiency of these devices is not good. Therefore, the applicant of the present invention improved the clarifier and obtained US Pat. Nos. 4,362,625 and 4,383,922. This invention relates to an improvement in the wastewater treatment method made possible by the Clarifire of the aforementioned patent. More particularly, this invention relates to an improved skimmer for removing oil, grease and other airborne particles from clarifiers. This gap allows oil etc. to be removed even if the water level in the oxidation channel and the clarifier changes.

Therefore, an object of the present invention is to provide an efficient method for treating wastewater.

Another object of the invention is to provide a wastewater treatment method that is both fast and inexpensive.

Another object of this invention is to provide a gap. Even if the water level in the oxidation channel and the clarifire changes, if you use this clarifiia,
Oil, grease, and other airborne particles can be removed from the surface of the fluid within the clarifier.

Another object of the invention is to provide a gap to maintain a constant amount of fluid flowing out of the clarifier.

Another object of this invention is to provide a skimmer whose openings are operated solely by the action of the fluid within the clarifier to release the clarified phase into the waste water.

Further objects and advantages of the invention will become apparent from the following detailed description of the invention.

The equipment used for the clarifier installed in the oxidation channel consists of a valve arrangement with a buoyant gate. The gate is disposed adjacent the inner wall of the clarifier and floats within the fluid within the clarifier. Note that an opening is formed in the side wall of the clarifier so that fluid can flow out from the clarifier into the oxidation waterway, and the device is attached to this opening.

In another embodiment of this invention, the wastewater clarification process is as follows. The first step is to divert a portion of the flow to an oxidation channel with a clarifier. Here, the clarifier has a rear opening for introducing a portion of the flow and a bottom opening for discharging fluid out of the clarifier. Second
The step is to flow the introduced fluid toward the front of the clarifier. The third step is to flow the fluid through the rear opening in a direction opposite to the flow direction of the part of the fluid. The reason for this step is to provide a sufficient flow distance to separate part of the flow into a clear phase and a sludge phase. The fourth step is to remove the sludge phase through the bottom opening and discharge the clarified phase into the waste water stream.

Next, one embodiment of the present invention will be described with reference to the drawings. Referring to FIG. 1, sewage in stream 1 is transferred by pump 3 through conduit 2 and introduced into an oxidation channel 4 formed by concrete walls 5,6. The introduced wastewater circulates within the oxidation waterway 4 in the direction of arrow A. If the flow rate of wastewater introduced into the oxidation waterway 4 is so slow that a sufficient flow rate cannot be obtained within the oxidation waterway 4, a conventional device can be used to obtain a predetermined flow rate.

Clarifier 7 is US Patent No.
4,362,625 and 4,383,922. In this case, the front part 8 (front side and arcuate part) of the clarifier eye 7 faces the water flow direction of arrow A. As shown in FIGS. 2 and 3, an opening 9 is formed in the rear part 10 (rear side and tail part) of the clarifier eye 7. As shown in FIGS. This opening 9 is preferably formed at the tail, and further preferably at a position where it is completely submerged below the water level B of the waste water in the oxidation waterway 4.
A plurality of rows of openings 1 are provided at the bottom 12 of the clarifier 7.
1 is formed. In a preferred embodiment of the clarifier 7, as shown in FIG. 3, cisterns 13 formed by sloping side walls 14 are arranged in parallel. In this case, the opening 11 is formed at the bottom of the water tank 13.

Openings 15 and 16 are formed in the rear side walls 17 and 18, respectively, in order to facilitate the removal of oil, grease, etc. that have accumulated on the surface of the fluid within the clarifier 7. The fluid near the surface is returned to the oxidation waterway 4 through the openings 15 and 16. In the preferred embodiment, a V-shaped rear buffle 19 is disposed between the rear side walls 17 and 18. This rear buttful 19 is located in front of the openings 15, 16, and its V-shaped apex 20 faces the tail 21. In this embodiment, the rear baffle 19 is disposed with a part of it immersed under the surface of the fluid, so that the dirty water in the deep part is removed from the arcuate part 2.
Flows to the 2nd side. Oil, grease, and the like are introduced into the openings 15 and 16 by this baffle 19 and are discharged to the outside of the clarifier eye 7. In a further preferred embodiment, a front baffle 23 is disposed between the front side wall 25 and the front side wall 26. The apex 24 of this front buttful 23 faces the tail 21. Oil, grease, etc. are introduced into the openings 27 and 28 by this front buffle 23. This is because, as will be described later, oil, grease, etc. do not float to the surface of the fluid until the phases are almost completely separated.

The clarifier 7 is fixed to the concrete walls 5, 6 by support members 29. Oxidation waterway 4
A skimmer (filter) is provided in front of each opening 27, 28 so that the flow velocity outside the clarifier 7 can be kept constant even if the water level of the fluid inside the clarifier 7 changes. A preferred embodiment of the gap 30 is shown in FIGS. 2 and 3. In this embodiment, the gap 30 includes side plates 31 and 32 arranged in parallel and a bottom plate 33 joined to the lower ends of the side plates 31 and 32. This side plate 31,
32 partially protrudes above the water surface 34 of the fluid in the opening 15 and the clarifier eye 7. A gate 35 is arranged between the side plate 31 and the side plate 32. This gate 35 is rotatably attached by a pin 36. A slot 37 is formed in the gate 35. This slot 37 is a notch formed in the upper end 38 of the gate. A float 40 is attached to the back surface 39 of the gate 35. This float 40 is on the water surface 34
Since it is disposed lower and has sufficient buoyancy, the upper end 38 of the gate can be held at the same position relative to the water surface 34 even if the water surface 34 changes. It is desirable that leakage of fluid from between the side plate 31 and the gate 35 be as small as possible, and it is also desirable that the gate 35 be able to freely rotate around the pin 36. Due to this gap 30, the fluid flowing out from the opening 15 is kept almost constant even if the water level 34 changes.

The movement of wastewater into the clarifier 7 through the opening 9 is in the direction of flow C, which is opposite to the direction of arrow A. By changing the direction of the flow in this way, turbulence is less likely to occur in the clarifier 7, and the wastewater is quickly separated and the sludge phase 4
8 and a clear phase 49.

After a predetermined amount of wastewater has been introduced into the clarifier 7, the opening 9 can be closed and the treatment can be carried out in a batch manner, but it is preferable that this treatment be carried out in a continuous manner. This treatment takes place between the bottom 12 and the bed 50 of the oxidation channel 4. The flow velocity in this part is faster than the flow velocity in other parts of the oxidation waterway 4. In this way, the high flow rate creates a pressure difference between the fluid in the clarifier 7 and the fluid in the oxidation channel 4, and as a result, the waste water, particularly the sludge phase 48, is drawn out of the clarifier 7 through the opening 11. The flow rate of wastewater drawn out from the opening 11 can be adjusted as appropriate. The first method is to change the total cross-sectional area of the openings 11 through which the waste water passes,
The second method is to change the pressure difference between the level of wastewater in the clarifier 7 and the level B of the wastewater in the oxidation channel 4. In a preferred embodiment, the pressure difference is adjusted by raising and lowering the clarifier 7 within the oxidation waterway 4. That is, the pressure difference is adjusted by changing the cross-sectional ratio of the flow of wastewater inside the clarifier 7 to the front surface of the clarifier 7. When the clarifier 7 is raised within the oxidation waterway 4, the flow rate of wastewater flowing out from the opening 11 increases. Correspondingly, the flow rate of the sludge phase passing through the openings 11 also increases.

When the wastewater flows into the clarifier 7 through the opening 9, the flow rate of the wastewater decreases and the heavy particles settle towards the bottom 12. As a result, a liquid or sludge phase containing a high proportion of unnecessary particles is formed near the bottom 12 of the clarifier 7. This sludge phase then flows out through the openings 11. The flow rate in the clarifier 7 is preferably a maximum of 0.1 feet/second (3.0 cm/second), and by appropriately determining the size and position of the opening 11, the volume ratio of the sludge phase 48 and the clarified phase 49 to be removed can be set to 1:1. or 2:1. Light particles (oil, grease, etc.) float to the surface of the fluid and are guided into the openings 15,16. This is because the floating lightweight particles are directed toward the rear buffle 19 by the fluid flow. All of these operations are performed without any external force, and the clarifier 7 does not use a powered scraper or the like to operate on its surface. In addition, a powered device or the like that creates special turbulence in the fluid in the clarifier 7 is installed in the gap 30.
There is no need to attach it to.

Finally, the clarified phase 49 is pumped into conduit 51 by a conventional pump (or gravity or siphon device) 52.
and returned into stream 1.

In another embodiment, a baffle plate 53 is disposed at an angle on the outer surface of the rear side walls 17, 18, so that the clarifi
It is becoming difficult for sewage to flow into the building.

Furthermore, the buoyant gate 35 floats when turbulence occurs in the oxidation channel 4 and prevents backflow into the clarifier 7, so that backflow does not contaminate the clarified phase.

This invention may be modified in many ways and is not limited to the embodiments disclosed herein.
Accordingly, the scope of the invention is limited by the scope of the claims.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view of a clarifier according to the present invention using a clearance, Fig. 2 is a detailed view of the clearance according to the invention, and Fig. 3 is a sectional view taken along the line -- of Fig. 1 to show a preferred embodiment of the clearance. , FIG. 4 is a sectional view taken along the line -- in FIG. 1. 1...Flow, 4...Oxidation channel, 7...Clarifier, 9...Opening, 10...Rear, 11,1
5, 16, 27, 28...opening, 12...bottom,
14... Side wall, 17, 18... Rear side wall, 19...
...Rear bump full, 20, 24... Apex, 21...
Tail part, 22... Arcuate part, 23... Front buttful,
25, 26... Rear side wall, 30... Clearance, 3
1, 32...Side plate, 33...Bottom plate, 34...Water surface, 35...Gate plate, 37...Slot, 40
...Float, 48...Sludge phase, 49...Clear phase.

Claims (1)

[Claims] 1. A step of circulating wastewater in an oxidation waterway in which a clarifier is installed, a step of converting a portion of the sewage into the clarifier, and a step of converting a portion of the sewage into a clarified phase and a sludge phase. flowing a portion of the wastewater at a sufficient velocity and over a sufficient distance for separation; and applying the surface of the portion of the wastewater to a buttful disposed between the side walls of the clarifier; A sewage treatment method comprising the steps of: removing the sludge phase from the clarifier; and removing the clarified phase from the clarifier, the front part of the clarifier being opposite to the flow direction of the sewage; The clarifier is disposed at a position that can reduce the cross-sectional area of the sewage in the oxidation waterway in which the clarifier is installed, and the clarifier has an opening in a side wall for discharging the surface portion of the sewage to the outside of the clarifier. A method for treating sewage water, characterized in that a baffle is provided to introduce the sewage in the surface portion into the opening. 2. The sewage treatment method according to claim 1, wherein the sewage on the surface portion flows out from the opening at a constant speed. 3. A sewage treatment device having a flow rate adjustment device for adjusting the amount of fluid flowing out from an opening formed in a side wall of a clarifier installed in an oxidation waterway, wherein the flow rate adjustment device has a gate. and a first member operably attached to the gate, the valve device being adjustably mounted adjacent the opening to adjust the amount of fluid exiting the opening; A sewage treatment device characterized in that the first member has a sensing mechanism for sensing a change in the water level of the fluid in the clarifier. 4. The sewage treatment apparatus according to claim 3, wherein the first member is a buoyant member attached to the gate. 5. The valve device comprises a parallel side plate and a bottom plate, the side plate is attached to the inside of the side wall, the bottom plate is attached to the bottom of the side plate and the inside of the side wall to form a recess, and the 4. The sewage treatment apparatus according to claim 3, wherein the gate is disposed within the recess, and the gate is a flat plate rotatably and vertically attached between the parallel side plates. 6. The sewage treatment apparatus according to claim 5, wherein both end surfaces of the flat plate are adjacent to the parallel side plates. 7. The device according to claim 5, wherein the gate protrudes above the fluid surface in the clarifier, and the gate is formed with a slot that allows the fluid in the clarifier to flow out into the opening. Sewage treatment equipment. 8. A buttful is disposed between the side walls of the clarifier, and the buttle is disposed at a position where fluid can be introduced into the opening, and a portion thereof is immersed below the water surface of the fluid in the clarifier. The sewage treatment apparatus according to claim 3, characterized in that: 9. The sewage treatment apparatus according to claim 8, wherein the baffle is V-shaped, and the apex of the baffle faces the direction of fluid flow within the clarifier. 10. The sewage treatment system of claim 9, wherein each of said side walls has an opening, and wherein said valve device having said gate is operably mounted adjacent each of said openings. 11 Two pairs of apertures are formed in said side wall, one pair of apertures being formed in the rear side wall of the clarifier and another pair of openings being formed in the front side wall of the clarifier, and each side wall having a respective pair of apertures. 4. The sewage treatment apparatus according to claim 3, wherein one of the openings is provided respectively. 12. The sewage treatment system of claim 11, wherein the valve device having the gate is operably mounted adjacent each of the openings. 13 a first baffle and a second baffle are disposed between side walls of the clarifier, the first baffle being disposed between each pair of apertures for introducing fluid into the pair of apertures; and said second
The baffle is disposed at a position where fluid can be introduced into the another pair of openings, and the first buffle and the second buffle are both disposed so that a portion thereof is immersed below the surface of the fluid in the clarifier. A sewage treatment device according to claim 12, characterized in that it is provided with: 14. Claim 1, wherein each of the baffles is V-shaped, with their vertices facing in the direction of fluid flow within the clarifier.
The sewage treatment device according to item 3. 15 A step of circulating wastewater in an oxidation waterway in which a clarifier is installed, a step of converting a portion of the sewage into the clarifier, and a step of circulating the sewage in order to separate a portion of the sewage into a clear phase and a sludge phase. A sewage treatment method comprising the steps of: flowing a part of the sludge phase at a sufficient speed and over a sufficient distance; removing the sludge phase from the clarifier; and removing the clarified phase from the clarifier. The front part of the clarifier is opposed to the flow direction of the sewage, and the clarifier is disposed at a position that can reduce the cross-sectional area of the sewage in the oxidation waterway in which the clarifier is installed. wastewater treatment method. 16. The sewage treatment method according to claim 15, wherein the sludge phase is removed from the clarifier through an opening formed in the bottom of the clarifier. 17. The method according to claim 16, characterized in that the volume of the part of the wastewater diverted into the clarifier is adjusted by varying the total cross-sectional area of the openings through which the sludge phase passes. Sewage treatment method. 18. The volume of the sludge phase removed from the clarifier via the opening is regulated by varying the pressure difference based on the water level within the clarifier and the level of sewage outside the clarifier. A sewage treatment method according to claim 16. 19. A wastewater treatment method according to claim 18, characterized in that the pressure difference is varied by vertically operating the clarifier. 20 The flow rate of the portion of wastewater introduced into the clarifier is a maximum of 0.1 feet/second (3.0 cm/second).
The sewage treatment method according to claim 16, characterized in that: 21 The sludge phase and the clarification phase are continuously removed from the clarification iron, and a volume of wastewater equal to the volume of both removed is converted into the clarification iron, and the amount of sewage in the clarification iron is always maintained constant. The sewage treatment method according to claim 15, characterized in that: 22. The sewage treatment method according to claim 21, wherein the volume ratio of the sludge phase to the clarified phase to be removed is 1:1 to 2:1. 23. The sewage treatment method according to claim 15, wherein the part of the sewage is diverted through an opening formed at the rear of the clarifier. 24. The sewage treatment method according to claim 23, wherein the opening is formed at a position such that it is completely submerged below the water level of the sewage in the oxidation waterway. 25. The sewage treatment method according to claim 23, wherein the rear part is located at the tail of the clarifier.