JP3175010B2 - Solid-liquid separation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to pretreatment of high-concentration sewage such as manure and human waste, gray water and industrial effluent in a sewage treatment plant, and solid components from sewage containing fine solid particulate components. The present invention relates to a solid-liquid separation device for performing separation and removal.

[0002]

2. Description of the Related Art Conventionally, as a pretreatment for a combined septic tank, a small-scale facility has a structure in which solid-liquid separation is performed by a sedimentation separation layer, or a medium- or large-scale facility has a structure (for general domestic wastewater treatment). The pretreatment is standardized such that a bar screen with a coarse screen mesh width of 50 mm, a crusher or a fine screen automatic mesh width of 20 mm, and another machine installed in the auxiliary waterway as a spare,
Also, in advanced treatment (anaerobic treatment using a contact filtration material) and the like, two units must be provided as in the case of a bar screen of 2 mm (automatic fine-grained screen). There was such a problem.

[0003] First, in a rough screen, 50 mm
There are bar screens at intervals in the waterway or automatic frying type, etc., but in any case, the accumulation of filth and clogging occurs. It is a source of odor pollution and sanitary pests due to the inclusion of lump.

[0004] The fine screen is of the automatic frying type, but it is a source of pollution of the fouled filth as described above, and is a bar screen at intervals of 20 mm. Since the wool fiber material passed through, it was a source of accidents involving the flow control pump at the subsequent stage.

Further, the fine-grained screen is a source of pollution as described above, and is unsanitary since human waste must be disposed of, and in recent years, the purification effect has been enhanced from the viewpoint of environmental protection. For this reason, the use of a membrane separation method is being adopted in the spread of advanced treatment purification facilities.However, with this bar-type fine-mesh screen, most of the hair, lint, etc. pass through, causing an accident involving the membrane. In addition, in the current state of automation, with the advance of advanced processing, hair and thread debris are entangled with the sensor and cause a malfunction.

Further, in the livestock manure processing, there are manure mixing and manure scraping methods, etc., but all of them are stored in a storage tank and carried out using a vacuum truck to spray farmland, which causes odor pollution due to the manure being sprayed. At the present time, it overflows from the storage tank and penetrates into the underground to cause groundwater contamination.

[0007]

The problem to be solved by the present invention is to prevent clogging in all pretreatments of sewage treatment by using a required screen and utilizing bubbles rising in water to prevent clogging. A structure that separates high-concentration wastewater into solid and liquid, which can solve the above-mentioned problems all at once, and can reduce construction costs, ease of maintenance and operation, and reduce operation and management costs. The present invention provides a liquid separation device, in which all solid wastewater is pre-treated by the solid-liquid separation device.
It has immeasurable effects such as hygiene and environmental protection.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises a separation tank into which sewage is poured, a box disposed below the surface of the sewage in the separation tank, and a box provided at the bottom of the box. A base, an outer air ejection pipe connected to a blower provided on at least one peripheral edge of the base, and an inner air ejection pipe connected to a blower juxtaposed inside the outer air ejection pipe. The inside of a metal plate having a large number of fine holes attached to a metal plate having a large number of openings attached by inclining upward so as to fall down toward bubbles generated by the inside air ejection pipe, A screen, and an outer screen having a large number of pores in a metal plate attached to the metal plate attached to the upper surface by inclining outward so as to fall down toward bubbles generated by the outer air ejection pipe on the outer side of the inner screen, Pass the outer screen through the inner screen Is obtained by a the suction port of the filtrate suction tube is connected to a filtrate suction pump for feeding the wastewater to the outside or the air lift pump suction port.

[0009]

In the present invention, the sewage in the separation tank first flows toward the suction port of the filtrate suction pipe provided inside the box or the suction port of the air lift pump. Is provided with an eye screen of a required size, and sewage is filtered by the screen, that is, solids, residue, etc. larger than the size of the screen flow into the screen. Instead, it stops outside.

[0010] Then, an air ejection pipe connected to the blower is provided to generate air bubbles below the outside of the screen.
The residue, SS, and the like, which are likely to become entangled with the screen, are pushed upward by the air bubbles to prevent the screen from being blocked, and the solids are larger than the coarseness of the screen stopped outside without flowing inward by the screen. The mold and SS are also pushed upward by the bubbles, so that the function of the screen does not deteriorate.

Also, the solid object temporarily stopped outside the screen is finely divided and solubilized by being hit by air bubbles or by contact with the screen when ascending.
When the suction port of the air lift pump is provided inside the box, the liquid is transferred by the air bubbles generated in the lower part, so that the clogging can be reduced.

[0012] By arranging a box in the center of the separation tank to generate a swirling flow in the sewage in the separation tank, air bubbles on the outside of the screen cause solid objects or SS, which do not pass through the screen, to flow. Sewage is moved by the swirling flow, heavy objects are settled, and light objects are collected at the center of the slow-flowing swirling flow so that they do not stop near the screen. It is something you never do.

Furthermore, a metal plate having a large number of large openings is used as a screen, and a resin film having a large number of fine holes is adhered to the metal plate. By using a plate, filtration is performed through pores while preventing the outer screen from being clogged by air bubbles, and then, while preventing screen from being clogged by air bubbles, finer and finer resin film is formed. Filtration is performed through holes to treat sewage highly.

Further, by inclining the screen 2 ° to 10 ° so as to fall down toward the air bubbles, the air bubbles rise along the screen, and tend to be entangled with the screen, thereby raising residues and the like. However, the air bubbles are prevented from passing through the screen, and are pushed by the air bubbles, so that the residue removed by filtration and the like do not pass through the screen.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the solid-liquid separation device of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a side view of a first embodiment of the solid-liquid separation device of the present invention, FIG. 2 is an explanatory diagram of the first embodiment of the solid-liquid separation device of the present invention, and FIG. FIG. 4 is a sectional view of the solid-liquid separation device of the present invention taken along line AA in FIG. 2, and FIG. 4 is a perspective view of the first embodiment of the solid-liquid separation device of the present invention;
FIG. 5 is a perspective view of a pretreatment device of the first embodiment of the solid-liquid separation device of the present invention, and FIG. 6 is an explanatory diagram showing a processing flow of the first embodiment of the solid-liquid separation device of the present invention. And FIG.
Is an explanatory view of a second embodiment of the solid-liquid separation device of the present invention, and FIG. 8 is a cross-sectional view of the second embodiment of the solid-liquid separation device of the present invention.

That is, as shown in FIG. 1, the solid-liquid separation device 1 of the present invention is mainly used for manure and human waste in a sewage treatment facility.
Pretreatment of high-concentration sewage such as gray water and industrial effluent, and separation and removal of solid components from sewage containing fine solid particles.

An inlet of a sewage inflow pipe 11 into which sewage flows is attached to an upper portion of the separation tank 9, and a tapered portion 9a is provided at a lower portion to collect sediment and sludge at a center of a bottom surface. The suction port of the advection tube 10a connected to the discharge pump 10b for taking out the accumulated sediment or sludge outside is mounted near the center of the bottom surface.

Next, as shown in FIGS. 1 to 4, the box is disposed below the surface of the sewage in the separation tank 9, and has a triangular prism shape composed of the base 2, the side plate 3, and the top plate 4. Alternatively, the blower 15 is a polygonal prism, and is a blower 15 for raising air bubbles provided on at least one peripheral edge of the base 2 into sewage.
a is provided with an air ejection pipe 7 connected to
That is, in the illustrated first embodiment, an inner screen 5 and an outer screen 6, which will be described later, are attached to two opposing side plates 3 of a rectangular column-shaped box.

Further, the air blow-out pipe 7 is connected to a blower 15a provided outside the separation layer 9 to blow out air, and is connected through an air blower pipe 15b connected to the blower 15a and a valve. Interposed with the air pipe 12,
The air ejection pipe 7 is provided at the tip of the air pipe 12, and has two stages to eject a large amount of air bubbles to an inner screen 5 and an outer screen 6, which will be described later.
Many are arranged.

The inner screen 5 is attached with its upper part inclined at an angle of 5 ° outward so as to fall down toward the air bubbles generated by the inner air ejection pipe 7 and has many large square openings. A resin film 5b having a large number of fine holes is adhered to a metal plate 5a formed as described above, and the outer screen 6 has an outward facing upward so as to fall down toward bubbles generated by the outer bubble generating means. And a metal plate having a large number of square openings, that is, the inner screen 5 and the outer screen 6 are attached so as to be parallel to each other. Is what it is.

Next, the filtrate suction pipe 13 is for sending out the filtered sewage in the box that has passed through the outer screen 6 and the inner screen 5 to the outside, and the filtrate suction pump 8 provided outside the separation tank 9. When the filtrate suction pump 8 is driven, the wastewater in the box passing through the outer screen 6 and the inner screen 5 is sucked through the suction port of the filtrate suction pipe 13, and the wastewater is further filtrated. Pump 8
The post-processing is performed by the advection pipe 14 for the post-processing connected to the second stage.

A first embodiment of the solid-liquid separation device 1 of the present invention is provided for treating manure of livestock of a certain livestock farmer in Shimabara district, Nagasaki prefecture, and is shown in FIGS. 1 to 6. As described above, a box is placed at the center of the vertical 2m x horizontal 2m x 2m high separation tank 9 into which the anaerobic tank and the aerobic tank of the sewage purification tank of the livestock farmer pour the sewage, and swirl the sewage in the separation tank 9 The outer screen 6 and the inner screen 5 are provided on the outer peripheral side of the box so as to generate a flow and the sewage is filtered, and the inner screen 5 has a large number of openings having a mesh width of 5 mm. A plate having a 20 μm resin film 5b adhered to a plate 5a is used.
Using a metal plate having a large number of square openings of m, air bubbles are generated by a large number of air ejection pipes 7 provided below the outside of each screen 5.6.

The pretreatment device 16 is provided with a pretreatment tank 16a below the inlet of the sewage inflow pipe 11 into which sewage flows into the separation tank 9, and has a mesh width of 5 mm so as to partition the inside of the pretreatment tank 16a. A pretreatment screen 16b having a large number of openings in a metal plate is provided at an angle of 5 °, and is connected to the blower 15a on the bottom surface of a pretreatment tank 16a below the inflow side of the pretreatment screen 16b. Is provided with a pretreatment tank air ejection pipe 16c, a bubble is generated by the pretreatment tank air ejection pipe 16c, and a sewage advection pipe 16e for sending filtered sewage downward is provided on the lower surface of the pretreatment tank 16a. Things.

Further, an air pipe 12 is connected to the air ejection pipe 7, and is connected so as to merge with an air pipe 16d of the pretreatment device 16 and further connected to an air blowing pipe 15b. One air pipe 12 is to be supplied with air by the same blower 15a as the air pipe 16d.

Next, the suction port of the filtrate suction pipe 13 is provided so as to be located between the two inner screens 5 opposed to each other in the box body. Then, the side plate 3 is provided on the side where the respective screens 5.6 are not provided, and the screen 5.6 is attached with water tightness so that the side ends of the respective screens 5.6 contact the side plate 3 without gaps. Further, the top plate 4 is provided so as to cover the upper part of the space surrounded by the inner screen 5 and the side plate 3.
Is attached with watertightness so that there is no gap between the upper end of the side plate 3 and the upper end of the screen 5.

In the first embodiment of the present invention, as described above, the box, the screen 5.6, and the bubble generating means are formed into one unit, so that the size can be reduced and the unit can be attached to the existing separation tank 9. This makes it possible to freely change the position in the separation tank 9, so that it is not necessary to make the shape corresponding to the separation tank 9 one by one, so that the cost can be reduced.

In this livestock farming farm, 1000 pigs (100 parent parents) are bred, and the feces of this pig are treated separately, but 6000 liters of human waste is discharged per day, and the discharged human waste is collected. The sewage inflow pipe 11 sends the wastewater to the separation tank 9 of the sewage treatment facility. The SS (suspended matter) of the sewage thus flown in at 2700 mg / liter is BOD (dissolved oxygen consumed by aerobic microorganisms).
Was 15000 mg / liter.

This sewage is supplied to a sewage inflow pipe 1 as shown in FIG.
1, the pretreatment tank 16a is sent into the pretreatment tank 16a, and the pretreatment tank 16a is provided with the pretreatment screen 16b so as to partition, so that both sides partitioned by the pretreatment screen 16b have the same water level. The sewage flows through the pretreatment screen 16b provided with a large number of square openings having a mesh width of 5 mm, so that the sewage is filtered, and thus the sewage such as hair and straw chips is removed. Rough substances such as pre-treatment screen 16
These substances, which do not pass through b, are periodically removed.

The pretreatment screen 16b is inclined by 5 ° to the inflow side of the waste water, and air bubbles are blown out from the air blowing pipe 16c located near the lower end of the pretreatment screen 16b and hit by the air bubbles. A swirl flow is generated in the wastewater on the inflow side of the pretreatment screen 16b,
Hairs and straw debris that do not pass through the pre-processing screen 16b due to the generated swirling flow are raised by the rising bubbles of air, so that the pre-processing screen is not blocked and is melted by hitting the bubbles. The material that has been crushed and has become finer than the pre-processing screen 16b passes through the pre-processing screen 16b.

Also, since the pre-processing screen 16b is inclined by 5 ° toward the inflow side, the residue and the like are removed from the pre-processing screen 1b.
Air bubbles hit so that they do not become entangled with 6b, and the air bubbles are prevented from passing through the pretreatment screen 16b, are removed by air bubbles, and the residue is not forcibly passed.
Heavy sediment and sludge of the sewage that has passed through the pretreatment screen 16b settles downward through the advection pipe 16e and moves to the bottom surface of the separation tank 9. At this time, below the separation tank 9, Since the tapered portion 9 a is provided, sediment and sludge are collected at the center of the bottom of the separation tank 9.

Further, among the sewage that has passed through the pretreatment screen 16b, even light ones can be changed by the water level difference.
Through the separation tank 9 as shown in FIG.
Screen 5 inside the solid-liquid separator 1 located at the center of the
By the operation of the filtrate suction pump 8 connected to the filtrate suction pipe 13 whose suction port is located in the space surrounded by the side plate 3, the top plate 4, and the base 2, the waste water inside the inner screen 5 is sucked. A pressure difference is generated between the inside and outside of the screen 6 so that sewage water outside the screen 6 tends to flow into the inside.

As a result, the sewage in the separation tank 9 flows toward the respective screens 5.6 of the solid-liquid separation device 1.
An air ejection pipe 7 provided on the outer side near the lower end of the outer screen 6 to the solid-liquid separation device 1 and an air ejection pipe 7 provided on the outer side near the lower end of the inner screen 5, respectively. As shown in FIG. 1 and FIG. 2, air bubbles are ejected obliquely upward, whereby the separation tank 9
The sewage near the sides on both sides of the solid-liquid separation device 1 located at the center of the tank rises, and a swirl flow occurs in which the sewage near the wall of the separation tank 9 descends.

When the sewage flows toward the outer screen 6, the screen 6 has a large number of square openings having a mesh width of 2 mm in the metal plate. Does not pass through the outer screen 6 and is swept upwards by the bubbles, thus moving the solids that do not pass through the outer screen 6 one after the other to form each screen 5.6. There is no clogging, and furthermore, bubbles are hit and solubilization proceeds due to resistance with water by flowing by convection,
Alternatively, the material that has been crushed and has become smaller than the opening of the outer screen 6 passes through the outer screen 6 and moves toward the inner screen 5.

Next, the inner screen 5 has an eye width of 5 m.
A metal plate having a large number of square openings of m
m, the solid matter 31 larger than the opening does not pass through the inner screen 5 but flows upward by air bubbles even when passing through the outer screen 6. Bubbles hit the solid object 31 and flow by convection. The solid object 31 receives resistance to water and is further crushed by miniaturization or solubilization, and becomes smaller than the opening of the inner screen 5. Is to pass through the outer screen 6 or the inner screen 5 again to reach the space of the box surrounded by the inner screen 5, the side plate 3, the top plate 4, and the base 2.

The sewage containing the fine solid matter that has reached the space of the box body is passed through the suction port of the filtrate suction pipe 13 through the filtrate suction pipe 13.
Into the advection tube 1
4 to be sent to the post-processing.

The SS of the sewage filtered by the solid-liquid separator 1 according to the first embodiment of the present invention is 270 mg.
/ Liter and 90% has been removed.
D is 4500 mg / liter, 70% of which has been removed, and the pretreatment of sewage can be performed at a very high level.

That is, clogging is prevented by the action of air bubbles on the inflow side of each screen 5.6, the need for maintenance is reduced, and the failure of the pump due to entanglement of residue or dirt can be reduced. The sediment / sludge stored on the bottom of the separation tank 9 is transferred to a sludge storage tank and a fertilizer house by a discharge pump 10b by an advection pipe 10a as required, and is sprayed on a field by a pump or a vacuum truck. However, since the residue is being removed, it emits only a small amount of odor.

Next, a second embodiment of the solid-liquid separation device of the present invention is shown in FIGS.
The air lift pump 2 for sending out the sewage in the box body to the outside instead of the suction port of the filtrate suction pipe 13 connected to the filtrate suction pump 8 for sending out the sewage inside the box body of the embodiment.
0 suction port.

In the present embodiment, the solid-liquid separation device 1 is provided with the respective screens 5.6 only on one surface of the outer periphery of the box, and the air lift pump 20 extends downward from the inside of the box and the lower end is closed. The outer tube 20b is provided.
An inner pipe 20a is provided inside the inside of the vessel, and the inner pipe 20a extends to above the separation tank 9, and the vicinity of the upper end thereof is an advection pipe 1 for post-processing.
4 and a lift air feed pipe 20c is provided inside the inner pipe 20a. Sewage that is filtered by the respective screens 5.6 and located inside the box body is discharged to the outside. It moves downward by water pressure from the suction port of the pipe 20b,
The inner tube 20a moves upward to the surface of the water.

When air is ejected from the lower end of the lift air feed pipe 20c in this state, the sewage in the inner pipe 20a is moved upward by the rising force of the air, and the sewage in the box body is continuously removed. It is sent upward and sent to the post-processing by the advection pipe 14.

The air lift pump 20 has no blade,
Since the particles are filtered through a fine-grained screen, troubles due to entanglement of filth are unlikely to occur, and the device is very easy to use.

In the solid-liquid separation device 1 according to the second embodiment, each screen 5.6 of the box is provided only on one surface and is installed near the side wall of the separation tank 9. The installation position of the can be determined according to the state of the tank to be installed and the relationship with other devices, other symbols, configuration,
The operation and usage are the same as in the first embodiment, and are omitted. .

[0044]

According to the present invention, solid-liquid separation can be reliably performed without causing clogging, the failure of the pump due to entanglement of residue or dirt is reduced, the filter medium is not clogged, and maintenance work is performed. It can be attached to the existing separation tank, is low in cost, does not generate strong odor when manure of livestock is sprayed on the field, etc., and enables advanced filtration processing in the subsequent stage. Yes, the one with the air lift pump inside the box can be used as a solid-liquid separation device that has less trouble and reduces maintenance work. The means provided in two stages can send the highly filtered sewage to the subsequent stage to increase the efficiency of the subsequent treatment,
An arrangement in which the treatment facility can be made smaller and a box is disposed in the center of the separation tank so as to cause a swirling flow in the wastewater in the tank can further increase the efficiency of treating the wastewater.

Furthermore, a metal plate having a large number of large openings and a resin film having a large number of fine holes adhered thereto is used as an inner screen, and pores are formed outside the inner screen as an outer screen. Those using a large number of metal plates can send highly-filtered sewage to the subsequent stage to increase the efficiency of the subsequent treatment and reduce the size of the treatment facility. 2 ° to 10 ° so that the processing screen falls down toward the bubbles.
° The tilted screen discharges the sediment stored at the bottom of the tank, which can reduce the maintenance work because the screen does not cause clogging and can surely remove the residue and solid matter of a specified size or more. The apparatus provided with the apparatus is capable of efficiently taking out sludge and sediment and using it as compost, and is a practical and very effective invention.

[Brief description of the drawings]

FIG. 1 is a side view of a first embodiment of a solid-liquid separation device of the present invention.

FIG. 2 is an explanatory diagram of a first embodiment of a solid-liquid separation device of the present invention.

FIG. 3 is a view showing the solid-liquid separation device according to the present invention in FIG.
It is sectional drawing of the -A line.

FIG. 4 is a perspective view of a first embodiment of the solid-liquid separation device of the present invention.

FIG. 5 is a perspective view of a pretreatment device according to a first embodiment of the solid-liquid separation device of the present invention.

FIG. 6 is an explanatory diagram showing a processing flow of the first embodiment of the solid-liquid separation device of the present invention.

FIG. 7 is an explanatory diagram of a second embodiment of the solid-liquid separation device of the present invention.

FIG. 8 is a sectional view of a solid-liquid separation device according to a second embodiment of the present invention.

[Description of Signs] 1 Solid-liquid separation device 2 Base 3 Side plate 4 Top plate 5 Inner screen 5a Metal plate 5b Resin film 6 Outer screen 7 Air ejection pipe 8 Filtrate suction pump 9 Separation tank 9a Tapered portion 10a Sediment / sludge 10b Discharge pump 11 Sewage inflow pipe 12 Air pipe 13 Filtrate suction pipe 14 Convection pipe for post-processing 15a Blower 15b Air blowing pipe 16 Pretreatment device 16a Pretreatment tank 16b Pretreatment screen 16c Air emission pipe for pretreatment tank 16d Air pipe 16e Sewage advection pipe 20 Air lift pump 20a Inner pipe 20b Outer pipe 20c Lift air feed pipe

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI B01D 29/38 580A 29/42 510 520

Claims (2)

(57) [Claims] 1. A separation tank into which sewage is poured, a box disposed below the surface of the sewage in the separation tank, a base provided at the bottom of the box, and air bubbles provided on at least one peripheral edge of the base. Outside air jet pipe connected to a blower for raising water into the sewage, and the inside of the outside air jet pipe connected to the blower for raising air bubbles arranged inside the outside air jet pipe into the sewage. A fine hole is formed in a metal plate having a large number of large opening portions which are attached by inclining outward at an angle of 2 ° to 10 ° so as to fall down toward the air bubbles generated by the inner air ejecting tube. And an inner screen to which a resin film having a large number of the air bubbles is attached, and 2 ° to 10 ° so as to fall down toward the bubbles generated by the outer bubble generating means outside the inner screen.
An outer screen having a large number of fine pores larger than the fine holes on a metal plate attached with the upper portion inclined outward, and wastewater in the box passing through the outer screen and the inner screen is sent out. A solid-liquid separation device comprising a filtrate suction pipe connected to a filtrate suction pump. 2. A separation tank into which sewage is poured, a box disposed below the surface of the sewage in the separation tank, a base provided on the bottom of the box, and air bubbles provided on at least one peripheral edge of the base. Outside air jet pipe connected to a blower for raising water into the sewage, and the inside of the outside air jet pipe connected to the blower for raising air bubbles arranged inside the outside air jet pipe into the sewage. A fine hole is formed in a metal plate having a large number of large opening portions which are attached by inclining outward at an angle of 2 ° to 10 ° so as to fall down toward the air bubbles generated by the inner air ejecting tube. And an inner screen to which a resin film having a large number of the air bubbles is attached, and 2 ° to 10 ° so as to fall down toward the bubbles generated by the outer bubble generating means outside the inner screen.
An outer screen having a large number of fine pores larger than the fine holes on a metal plate attached with the upper portion inclined outward, and wastewater in the box passing through the outer screen and the inner screen is sent out. A solid-liquid separation device comprising a suction port of an air lift pump.