JP2005254116A - Waste water treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waste water treatment apparatus in which a rotary drum and its rotating mechanism are not necessitated so that a carrier is not involved in the rotary drum by the rotation of the rotary drum, waste water treatment is continued by preventing the clogging of a porous member for separating the carrier and suspended matter, the clogging is eliminated easily even when the porous member is clogged and consequently the treatment cost of waste water can be reduced. <P>SOLUTION: This waste water treatment apparatus is composed of: a treatment tank 1 for keeping the microbe-immobilized fluidization carrier 3 in a suspended state in waste water W; a cylindrical body 5 which is sunk vertically almost in the center of the treatment tank 1 and the upper and lower ends 5a, 5b of which are opened; an air supplying means 6 arranged in the lower part of the cylindrical body 5; a bottomed filter body 7 which is arranged in the upper part of the cylindrical body 5 and has a bottom 7b and an upper end 7a opened at the position equal to or higher than the water level L; and a treated water withdrawing pipe 8 extended from the inside of the bottomed filter body 7 to the outside of the treatment tank 1. It is preferable that the bottomed filter body is cylindrical, the cross-sectional area of the cylindrical body 5 is 40-60% of that of the treatment tank 1 and the bottom 7b of the bottomed filter body 7 is plugged. It is more preferable to arrange a water jetting means 9 in an opened portion of the upper end 7a of the bottomed filter body 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wastewater treatment apparatus for treating the wastewater with microorganisms in a treatment tank in which a fluid carrier (hereinafter simply referred to as “carrier”) in which microorganisms are immobilized is held in a suspended state in the wastewater.

  In a wastewater treatment device that treats wastewater with microorganisms in a treatment tank in which the carrier on which microorganisms are immobilized is kept floating, if the carrier on which microorganisms are immobilized flows out of the treatment tank together with the treated water, the wastewater treatment effect is obtained. Reduce. Therefore, it is necessary to replenish the amount of carrier that has flowed out of the processing tank.

  In order to prevent the carrier from flowing out together with the treated water from the treatment tank, it is necessary to separate the treated water and the carrier and take out only the treated water from the treated tank. Therefore, in general, a filter body made of a porous member or the like for solid-liquid separation is provided at the treated water outlet.

  However, if the wastewater treatment is continued, the carrier and suspended matter are collected in the filter body, the filter body is clogged, and at the same time, the carrier is unevenly distributed in the treatment tank, which is not preferable.

Conventionally, in order to solve the above problem, a rotating drum having a circumferential surface formed of a water-permeable porous material is installed in a wastewater treatment tank so that 1/2 to 2/3 is submerged, In addition, it has been proposed to provide a spray nozzle for injecting high-pressure water for detaching suspended substances attached to the outer periphery of the water-permeable porous material.
JP-A-8-215893

  The present invention eliminates the need for a driving mechanism such as a rotating drum and its rotating mechanism, does not cause the carrier to be involved with the rotation of the drum, and further provides a filter medium comprising a porous member or the like for separating the carrier and suspended substances. It is an object of the present invention to provide a wastewater treatment apparatus that prevents clogging and is easy to eliminate clogging when clogging is caused by continuing wastewater treatment and reducing wastewater treatment costs.

  In order to solve the above-described problems, a wastewater treatment apparatus according to the present invention includes a treatment tank that holds a carrier on which microorganisms are immobilized in a suspended state in wastewater, and an upper and lower submerged vertically in a substantially central portion of the treatment tank. A cylindrical body having an open end, an air supply means disposed at a lower portion of the cylindrical body, a bottomed filter body disposed at an upper portion of the cylindrical body and having an upper end opened above the water surface, and the bottomed filter body And a treated water take-out pipe led out from the inside of the treatment tank (claim 1).

  The carrier is a material that immobilizes microorganisms and flows in wastewater, preferably a sponge-like porous body having a specific gravity equivalent to that of wastewater and easily adhering to microorganisms or a structure having many gaps, For example, the span is 0.5 mm to 20 cm.

  The shape of the treatment tank is arbitrary, and may be a circle, a rectangle, or other polygons in plan view. Moreover, the said processing tank uses the raw material which does not corrode by the substance contained in waste_water | drain, for example, what gave the corrosion-resistant coating to the steel plate. Furthermore, it is composed of a material that can withstand strength even when the internal drainage is strongly stirred, and a reinforcing member that is provided to withstand the stirring as required.

  The cylindrical body opened at the upper and lower ends provided in a state of being vertically sunk in the substantially central portion of the treatment tank is such that the open portion at the upper end is below the water surface and the open portion at the lower end is not in contact with the bottom. Provided.

  Furthermore, like the said processing tank, it is comprised with the raw material which is not corroded by the substance contained in waste_water | drain, The shape is also arbitrary, but an internal diameter is made constant. In addition, the said cylinder is supported by the approximate center part of the said processing tank by the support arm etc. which were provided from the inner surface of the said processing tank, or also from the bottom part.

  The air supply means arranged at the lower part of the cylindrical body is made of a material that is not affected by the substance contained in the waste water, like the treatment tank and the cylindrical body. And it arrange | positions in the inside of the lower end of the said cylinder, or just under, but considering the oxygen supply efficiency to microorganisms, it is desirable to arrange | position as close to the bottom part of the said processing tank as possible.

  The air supply means may have any structure as long as it has a function of sending air or oxygen bubbles into the waste water. That is, a perforated pipe, a vibrating disk diffuser, an air diffuser that ejects air bubbles from the pores, and the like may be used together with a structure or a crushing device that physically crushes the generated air bubbles. The speed of the water flow generated inside the cylindrical body by the air supply means is preferably about 10 m / s or more.

  The bottomed filter body disposed at the upper part of the cylindrical body and having the upper end opened above the water surface is composed of a porous member that is not affected by substances contained in the waste water, like the treatment tank, the cylindrical body, and the air supply means. , And arranged on the upper part of the cylinder. That is, it is arranged at the inner center or directly above the upper end of the cylindrical body, and the open portion at the upper end is positioned above the water surface. Preferably, the open portion at the upper end is appropriately protruded above the water surface so that the inside can be easily cleaned with a brush or the like.

  Moreover, it is preferable that the bottomed filter body forms a vertical lattice by arranging bars or thin plates that are not affected by substances contained in the waste water. The inner diameter shape and height of the bottomed filter body are not particularly defined. Moreover, it is preferable that the bottomed filter body has a circular or square cylindrical shape (Claim 2), and may have an inverted conical shape (Claim 3).

However, it is necessary to secure a wetted area so that the carrier does not concentrate too much with respect to the amount of treated water and the amount of the carrier. For example, the wetted area per 1 m ³ / hr of treated water is approximately 10 cm ^2. The diameter and height are determined so as to be above. Further, the opening is made smaller than the minimum span of the carrier. For example, when the span is 0.5 mm, the aperture is 0.3 mm.

  The removal of the treated water from the inside of the bottomed filter body by the treated water extraction pipe led out of the treatment tank may be carried out by using a pump in addition to the natural flow down.

  One embodiment of the present invention is characterized in that, in the above invention, the cross-sectional area of the cylindrical body is 40 to 60% of the cross-sectional area of the treatment tank (Claim 4). According to this embodiment, a preferable fluid circulation of the carrier is performed in the treatment tank and the cylinder, and the wastewater treatment effect is enhanced.

  Still another embodiment of the present invention is characterized in that, in the above invention, the bottom of the tubular bottomed filter body is closed (Claim 5). That is, the bottom portion of the cylindrical bottomed filter body is not made porous like the outer peripheral surface, but is completely closed with a plate material or the like.

  According to this embodiment, since the lower surface of the bottom of the cylindrical bottomed filter body is a smooth surface, the carrier and suspended solids raised together with the wastewater by the air supply means are the bottomed filter body. It will not be collected or adhered to the bottom surface of the bottom of the.

  At the same time, the carrier that has been raised by the air supply means and reached the bottom of the bottomed filter body has a closed bottom, so that the carrier has an outer peripheral surface that is orthogonal to or intersects with the water permeation direction of the bottomed filter body. Accordingly, clogging of the outer peripheral surface of the bottomed filter body is prevented, and solid-liquid separation by the bottomed filter body is effectively performed.

  Still another embodiment of the present invention is characterized in that, in the above invention, the bottomed filter body is detachable (Claim 6). According to this embodiment, the bottomed filter body can be easily cleaned or replaced, and the apparatus can be easily maintained.

  Still another embodiment of the present invention is characterized in that water injection means is provided in an open portion at the upper end of the bottomed filter body (Claim 7). According to one embodiment of the present invention, when the drainage treatment is continued and clogging of the bottomed filter body due to the carrier and suspended solids is confirmed, the water can be removed without removing and cleaning the bottomed filter body. Water can be sprayed into the bottomed filter body by the spraying means and collected on the outer peripheral surface of the bottomed filter body, or adhering carriers and suspended solids can be separated to easily eliminate clogging. The water injection means includes manual water injection in addition to the fixed injection structure.

  According to the present invention, since a driving mechanism such as a rotating drum and its rotating mechanism is not required, the carrier does not get involved with the rotation of the drum, and the filtration is made of a porous member or the like for separating the carrier and the suspended substance. Clogging of the body is prevented, and it is easy to eliminate clogging when clogging occurs by continuing the wastewater treatment, and the wastewater treatment cost can be further reduced.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic longitudinal sectional view of the present invention. In the same figure, 1 is a processing tank, The shape is arbitrary, In one Embodiment of drawing, although the bottom part 2 is formed in planar shape, it is good also as a mortar shape which made the center part low.

  In the figure, reference numeral 3 denotes a carrier on which microorganisms are immobilized, and is held in a floating state in the waste water W in the treatment tank 1. In the figure, reference numeral 4 denotes a drainage supply pipe for supplying the drainage W from above the treatment tank 1.

  In the present invention, the cylindrical body 5 with the upper and lower ends opened is provided in the vertical direction in the substantially central portion of the processing tank 1 in a submerged state. The cylindrical body 5 may have any shape, but the inner diameter is constant, and preferably the cross-sectional area is 40 to 60% of the cross-sectional area of the treatment tank 1.

  The cylindrical body 5 is provided such that the upper end 5 a is positioned below the water surface L and the lower end 5 b is not in contact with the bottom 2 of the processing tank 1. The cylindrical body 5 is supported at the approximate center of the processing tank 1 by a support arm (not shown) provided from the inner surface of the processing tank 1 or from the bottom 2.

  Next, air supply means 6 for sending air or oxygen bubbles into the drainage W and inside the cylinder 5 is provided at the lower part of the cylinder 5.

  Further, a cylindrical bottomed filter body 7 having a bottom portion 7b closed and an upper end 7a opened above the water surface L is provided on the upper portion of the cylinder body 5. The bottomed filter body 7 is supported at the upper center of the tubular body 5 by the support body (not shown) or the like provided from the tubular body 5 or further from the inner surface of the processing tank 1.

  In the figure, 8 is an inner end 8 a located in the bottomed filter body 7, and a treated water take-out pipe led out of the treatment tank 1, 9 is an open upper end 7 a of the bottomed filter body 7. Water jetting means B provided in the part is a bubble.

  FIG. 2 shows another embodiment of the bottomed filter body 7. That is, it is a case where the said bottomed filter body 7 is made into the reverse cone shape, and another structure is the same as that of one Embodiment of the said FIG.

  FIG. 3 shows an embodiment in which the bottomed filter body 7 is configured to be detachable. That is, the inner end 8 a of the treated water discharge pipe 8 is extended through the cylindrical body 5 through the cylindrical body 5, and the inner end 8 a is vertically upward in the cylindrical body 5. The flange 10 and the seal member 11 are provided at appropriate positions.

  On the other hand, a sealing material 12 is also provided on the bottom surface of the bottom 7b of the bottomed filter body 7 as necessary. Further, a through-hole 13 through which the inner end 8a of the treated water discharge pipe 8 is inserted is formed in the bottom portion 7b of the bottomed filter body 7. The bottomed filter body 7 is lowered from above, and the bottom portion 7b The formed through-hole 13 is adapted to be supported by the inner end 8a of the treated water outlet pipe 8 bent vertically upward.

  Further, the bottomed filter body 7 is supported in a state in which it can be pulled out upward from a support arm (not shown) provided from the cylindrical body 5 or from the inner surface of the treatment tank 1. It is. According to the said structure, the said bottomed filter body 7 is detachable, and when progress of clogging is remarkable, it can remove and clean or replace | exchange, and the maintenance of an apparatus is also easy. The removable structure of the bottomed filter body 7 is not limited to the above.

  In the present invention having the above-described configuration, the waste water W is supplied from the waste water supply pipe 4 to the treatment tank 1, and the carrier 3 is held in a floating state in the waste water W having a predetermined amount. At the same time, air or oxygen is supplied from the air supply means 6 into the waste water W, and bubbles B of the air or oxygen are raised in the cylinder 5.

  As a result, when the carrier 3 and suspended solids are raised in the cylindrical body 5 together with the drainage W and reach the bottomed filter body 7, the carrier 3 and suspended matter in the drainage W are removed from the bottomed filtration. It is raised along the outer peripheral surface orthogonal to or intersecting with the water permeation direction of the body 7 and does not cause clogging.

  Then, the waste water W, the carrier 3 and the suspended substance are discharged radially from the upper end 5a of the cylindrical body 5 toward the inner peripheral wall surface of the processing tank 1, and further circulated to the bottom of the processing tank 1, so that the cylindrical body 5, the inside of the cylinder 5 is raised again, and the circulation is repeated, and the wastewater is treated by the microorganisms immobilized on the carrier 3.

  Waste water is treated by repeating the circulation, and the treated water in the bottomed filter body 7 separated into solid and liquid is led out of the treatment tank 1 through the treated water discharge pipe 8.

  As described above, when the drainage process is continued and clogging of the bottomed filter body 7 is confirmed, the water injection means 9 provided at the open portion at the upper end of the bottomed filter body 7 The clogging can be easily eliminated by jetting water. Moreover, if necessary, the bottomed filter body 7 can be removed and cleaned or replaced. Furthermore, the present invention can reduce wastewater treatment costs without a special drive mechanism.

It is a schematic sectional drawing of the waste water treatment equipment concerning the present invention. It is a schematic sectional drawing which shows other one Embodiment of this invention. It is a schematic sectional drawing which shows one form of the attachment or detachment structure of a bottomed filter body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Treatment tank 3 Fluid carrier 5 Cylinder 6 Air supply means 7 Bottomed filter body 8 Treated water extraction pipe

Claims (7)

A treatment tank that holds a fluid carrier in which microorganisms are fixed in a waste state in a wastewater, a cylindrical body that is submerged in a vertical direction at a substantially central portion of the treatment tank, and an open upper and lower ends, and a lower part of the cylindrical body. Arranged air supply means, bottomed filter body disposed above the cylindrical body and having an upper end opened above the water surface, and treated water take-out pipe led out of the treatment tank from the inside of the bottomed filter body And a wastewater treatment apparatus characterized by comprising: The wastewater treatment apparatus according to claim 1, wherein the bottomed filter body is cylindrical. The wastewater treatment apparatus according to claim 1, wherein the bottomed filter body has an inverted conical shape. The wastewater treatment apparatus according to any one of claims 1 to 3, wherein a cross-sectional area of the cylindrical body is 40 to 60% of a cross-sectional area of the treatment tank. The wastewater treatment apparatus according to claim 2, wherein a bottom portion of the bottomed filter body is closed. The wastewater treatment apparatus according to any one of claims 1 to 5, wherein the bottomed filter body is detachable. The waste water treatment apparatus according to any one of claims 1 to 6, wherein water injection means is provided in an open portion at an upper end of the bottomed filter body.

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