JP2000334212A - Solid-liquid separation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid-liquid separation device simple in configuration, small in size and capable of effectively separating a solid from a liquid. SOLUTION: This device is provided with a solid-liquid separation section 10 agitated with jet streams having perforated plates 11 inserted vertically with respect to the flow direction of raw water to which a flocculant is added and a membrane separation section 30 for performing solid-liquid separation by a separation membrane 31 successively on the downstream side of the section 10. A sedimentation promoting section comprising a slant pipe or the like is also provided between the section 10 and the section 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-liquid separation device, and more particularly, to a small-sized solid-liquid separation device having excellent solid-liquid separation efficiency.

[0002]

2. Description of the Related Art As a coagulating sedimentation device in a water treatment facility, a stirring pond and a stirrer (such as a flocculator) for forming flocs with a coagulant.
And a sedimentation tank (settling tank) that sediments the formed flocs
Are known. However, this device requires a drive source for the stirrer and the like, and also requires a space for installing a stirring tank and a sedimentation tank.

[0003] Under such circumstances, a jet-stirred solid-liquid separation device has been developed as a coagulation-sedimentation device capable of obtaining a stirring action without using a stirrer. This jet-stirring solid-liquid separation device is to jet raw water to which a coagulant has been added from a through-hole of a perforated plate to obtain a stirring action by the energy of the jetted water, and to install an appropriate number of perforated plates in a water stream. Since the jet agitation can be performed only by using the above, there is an advantage that a driving source is not required.

[0004] Further, flocks having a high sedimentation property are formed by jet agitation of the perforated plate, so that the flocs are settled in a channel portion where the perforated plate is installed. Therefore, floc formation and sedimentation can be performed simultaneously only by installing a perforated plate perpendicular to the water flow in an appropriate flow path, which is advantageous in terms of installation space.

[0005] It is an object of the present invention to provide a solid-liquid separation device that can further improve the separation efficiency by using the above jet-stirred solid-liquid separation device.

[0006]

In order to achieve the above object, the solid-liquid separation apparatus of the present invention inserts a perforated plate perpendicular to the flow direction of raw water to which a flocculant has been added, and passes through the perforated plate. On the downstream side of the jet-stirred solid-liquid separation unit that forms and precipitates flocs by the stirring action of the water jet ejected from the holes, a membrane separation unit that performs solid-liquid separation by a separation membrane is connected, and further, A sedimentation promoting unit such as an inclined tube is provided between the jet agitation solid-liquid separation unit and the membrane separation unit.

[0007]

FIG. 1 is a schematic sectional view showing a first embodiment of a solid-liquid separation device according to the present invention. The solid-liquid separation device includes a jet-stirred solid-liquid separator 10, a membrane separator 30 connected to the jet-stirred solid-liquid separator 10 via a partition 20, a jet-stirred solid-liquid separator 10, The raw water to which the coagulant is added is fed from the inflow unit 2 through the mixer 1 such as a static mixer (line mixer) to the jet agitation solid / liquid separation unit 10. Flows into.

The jet-stirring solid-liquid separation section 10 has a plurality of perforated plates 11 inserted perpendicular to the flow direction of raw water. Raw water mixed with a coagulant is provided at a predetermined position on the perforated plate 11. Spouts are ejected to the downstream side from the plurality of through-holes 12 formed, and a floc having a high sedimentation property is formed by the stirring action by the energy of the ejected water. The formed flocks settle at the bottom of the tank and are discharged from a mud discharge valve (not shown).

The raw water that has passed through the lower opening 21 of the partitioning section 20 from the jet agitation solid-liquid separating section 10, ascends the sedimentation promoting section 40 and flows into the membrane separating section 30 is converted into a nonwoven fabric, a microfiltration membrane, and an ultrafiltration membrane. The final solid-liquid separation is performed by a flat-membrane-like separation membrane such as that described above, or an immersion-type separation membrane 31 using a fine eye screen, and fine flocs in water are captured by the separation membrane 31, and the separation membrane is separated. The treated water that has passed through 31 flows out of outlet 3.

As described above, the floc is formed in the jet agitation solid-liquid separation unit 10, and most of the formed floc is settled and separated, so that the final solid-liquid separation is performed in the membrane separation unit 30. Thus, effective solid-liquid separation can be performed in one treatment tank. Further, since the jet-stirred solid-liquid separator 10 and the membrane separator 30 are connected via the partition 20, the water treated by the jet-stirred solid-liquid separator 10 is pumped to the membrane separator 30 by a pump or the like. In comparison with this, the flocs remaining in the raw water are not mixed again, and the amount of flocs in the raw water to be treated in the membrane separation unit 30 can be reduced, so that the load on the separation membrane 31 can be greatly reduced. Processing performance can be improved.

FIGS. 2 to 5 show a second embodiment of the solid-liquid separation apparatus of the present invention. FIG. 2 is a sectional front view, FIG. 3 is a plan view, and FIG. 4 is a sectional side view of a membrane separation section. FIG. 5 is a sectional side view of the jet agitation solid-liquid separation unit.

This solid-liquid separation apparatus has a jet-stirred solid-liquid separation section 10 in which a plurality of perforated plates 11 are installed, a first partition plate 23 having an opening 22 at the top, and a second partition plate 23 having an opening 24 at the bottom.
A partition part 20 composed of a partition plate 25 and a immersion type separation membrane 31
And a sedimentation promoting unit 40 provided below the membrane separation unit 30.

As shown in FIG. 4, the perforated plate 11 provided in the jet-stirring solid-liquid separation unit 10
A large number of through holes 12 are provided on one upper side of a plate having an outer shape corresponding to the internal shape of the jet stirrer. In the jet-stirred solid-liquid separation unit 10, the positions of the through holes 12 are alternated. is set up.

Therefore, the mixture is mixed with the flocculant in the mixer 1,
Raw water flowing from the inflow section 2 into the jet agitation solid-liquid separation section 10 sequentially passes through the through holes 12 of each perforated plate 11 to form a meandering flow as shown in FIG.
The flocs are formed by being stirred by the energy of the water spouting through the. The formed flock is
The sediment is settled at the bottom of the tank between the perforated plates 11, and is appropriately discharged from a mud discharge valve 13 provided as shown in FIG.

The raw water subjected to floc formation and sedimentation separation in the jet-stirring solid-liquid separation unit 10 overflows the upper opening 22 of the first partition plate 23 and descends between the two partition plates 23, 25. 2 flows out from the lower opening 24 of the partition plate 25,
It flows below zero. At this time, by overflowing the upper opening 22 of the first partition plate 23, the flocs in the raw water flowing from the jet-stirred solid-liquid separation unit 10 to the sedimentation promoting unit 40 are settled at the final stage of the jet-stirred solid-liquid separation unit 10. And the amount of flocs flowing downstream can be reduced.

The sedimentation promoting section 40 is formed by arranging a large number of pipes or plate members at a predetermined angle, and has an action of promoting sedimentation of flocs remaining in raw water. Therefore, while the inclined floe portion of the sedimentation promoting section 40 is raised, the sedimentation of the flocs remaining in the raw water is promoted, and most of the flocs are separated from the raw water and settle and settle on the tank bottom 41, and the drainage valve It is discharged as appropriate from.

The raw water from which most flocs have been separated by ascending the sedimentation promoting unit 40 is further separated into the membrane separating unit 3
The solid-liquid separation treatment is performed by the separation membrane 31 of No. 0, and the treated water becomes clean treated water and flows out of the outflow portion 3.

As described above, by providing the sedimentation promoting section 40 below (upstream side) the membrane separating section 30, the membrane separating section 3 is provided.
Since the amount of flocs remaining in the raw water to be treated at 0 can be reduced and the load on the separation membrane 31 can be greatly reduced, not only the processing performance is improved but also the cost required for cleaning the separation membrane 31 and the like. Can also be reduced.

In the present embodiment, the part where the membrane separation part 30 and the settling promoting part 40 are installed is replaced with the jet stirring solid-liquid separation part 10.
Since it extends downward, the space between the membrane separation unit 30 and the settling promoting unit 40 can be sufficiently secured. Thereby, the area of the separation membrane 31 can be made sufficiently large, and the flow path length of the sedimentation promoting part 40 can be made sufficiently long, so that the processing performance in the membrane separation part 30 and the sedimentation promoting part 40 can be improved. it can. The sedimentation promotion part 4
Since the outer shell 43 of 0 is formed in an inclined state according to the outer shape of the sedimentation promoting part 40, the dead space near the sedimentation promoting part 40 can be reduced.

The addition and mixing of the coagulant into the raw water can be performed with any equipment. For example, when the raw water is pumped into the solid-liquid separator, the pump for pumping may be a booster pump, and the coagulant may be added and mixed here.

The number and intervals of the perforated plates 11 in the jet agitation solid-liquid separation unit 10, the shape of the through holes 12, the number of the perforations 12, and the like can be appropriately set according to the state of the raw water. Similarly, the structure of the sedimentation promoting unit 40 can be appropriately set according to the state of the raw water and flocs. Further, the membrane separation unit 30 may be provided with equipment for performing membrane cleaning or the like, for example, an air diffuser. Also, the separation membrane 31
May be performed as it is by stopping the flow of raw water, or may be taken out to another cleaning tank.

Further, the jet-stirring solid-liquid separation unit 10, the sedimentation promoting unit 40 and the membrane separation unit 30 may be provided in parallel at the same level via an appropriate partition or pipe.

[0023]

As described above, according to the solid-liquid separation device of the present invention, effective solid-liquid separation can be performed with a small device having a simple structure.

[Brief description of the drawings]

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

FIG. 2 is a sectional front view showing a second embodiment of the solid-liquid separation device of the present invention.

FIG. 3 is a plan view of the same.

FIG. 4 is a cross-sectional side view of the membrane separation unit.

FIG. 5 is a cross-sectional side view of the jet agitation solid-liquid separation unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mixer, 2 ... Inflow part, 3 ... Outlet part, 10 ... Jet stirring solid-liquid separation part, 11 ... Perforated plate, 12 ... Through hole, 13 ... Drain valve, 20 ... Partition part, 21 ... Lower opening, 22 ... upper opening,
Reference numeral 23: first partition plate, 24: lower opening, 25: second partition plate, 30: membrane separation unit, 31: separation membrane, 40: sedimentation promoting unit, 41: tank bottom, 42: drain valve, 43: outside shell

Claims (2)

[Claims] 1. A jet stirrer in which a perforated plate is inserted perpendicularly to the flow direction of raw water to which a coagulant has been added, and floc formation and sedimentation are performed by the stirrer of a water flow spouted from a through hole of the perforated plate. A solid-liquid separation device, wherein a membrane separation unit that performs solid-liquid separation by a separation membrane is provided downstream of the liquid separation unit. 2. The solid-liquid separation device according to claim 1, wherein a sedimentation promoting unit such as an inclined tube is provided between the jet stirring solid-liquid separation unit and the membrane separation unit.