JP2002177948A - Water cleaning plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly and efficiently obtain a water cleaning plant which efficiently clarifies the water to be treated, such as factory waste water, with a smaller floor area. SOLUTION: After coarse solids in the water to be treated are separated away by a coarse solid-liquid separator 1, particulates and colloidal particles are separated away by a precision solid-liquid separator 2 and finally, the water is subjected to decoloring treatment in decoloring equipment 3, by which the water is cleaned. The precision solid-liquid separator 2 is provided with an outer cylinder 2a, double inner cylinders 2d and 2e, a central cylinder 2f, filter sections 2i and 2j formed at the double inner cylinders, a circulating path 2k and an upper conical section 2f' and pendent cylinder 2f" of the central cylinder 2f in order to separate away the particulates and the colloidal particles by the centrifugal separation effect by swirling flow and the particulate capturing effect by the static pressure fall and bubble intrusion by inner and outer double vortex generating means 2g and 2m which are reverse in swirling directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification apparatus for efficiently purifying water to be treated, such as industrial wastewater, in a short space and in a short time.

[0002]

2. Description of the Related Art Conventionally, solids and organic colloidal substances (for example, having a particle
m, specific gravity of about 1.2)
Water purification equipment such as sand filtration, a pressure floatation tank, and a coagulation settling tank are used.

[0003]

The conventional water purification equipment has a problem in that it requires a large installation area and requires a long time for the treatment.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a water purification apparatus for efficiently purifying water to be treated, such as factory wastewater, in a space-saving manner in a short time. .

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a crude solid-liquid separation apparatus for adding a flocculant to treated water to separate coarse solids in the treated water. A precision solid-liquid separation device that separates the water to be treated, into which fine solids have been separated and removed by a liquid separation device, into fine particle concentrates and treated water, and a decolorizing agent is added to the treated water separated by the precision solid-liquid separation device. A decolorizing device for purifying water, and disposing the precision solid-liquid separator in an outer cylinder formed of a cylindrical body, a pair of lids for closing both ends of the outer cylinder, and the inside of the outer cylinder. A double inner cylinder is provided, a center cylinder disposed in the double inner cylinder, and an inner cylinder inside the outer cylinder so as to swirl and flow the water to be treated while generating bubbles along the outer cylinder. Vortex generating means for supplying the water to be treated mixed with gas to the outside, and a centrifugal force acting according to the swirling flow of the water to be treated. A concentrate discharge passage for discharging the separated fine particle concentrate to the outside, and separated water from which the fine particle concentrate has been separated is allowed to pass through the double inner cylinder, and at this time, the fine particles in the separated water are covered with the separated water. A filtration unit comprising a large number of through holes formed in the double inner cylinder for collecting and filtering and separating by bubbles in the treated water, and separating the separated water permeated into the double inner cylinder together with the bubbles with the above. By swirling in the opposite direction, the air bubbles are moved to the center side according to the static pressure difference generated in the radial direction to generate a gas-water mixing vortex, and the fine particles are concentrated by the gas-water mixing vortex and doubled. Discharged from the upper part of the inner cylinder to the outside from the upper part of the inner cylinder and discharged as a fine particle concentrate from the concentrate discharge path, and the remaining separated water is again circulated from the upper center of the double inner cylinder via the circulation path to the double inner cylinder. Eddy current generated by tangential reflux from below in the middle And the step is disposed in the double inner tube of, in which the treated water fine particles are collected separated by bubbles of said steam-water mixing vortex flow is constituted by a central cylinder to derive from the lower to the outside.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of the entire water purification apparatus of the present invention, FIG. 2A is an enlarged explanatory view of a precision solid-liquid separation apparatus,
(B) is an explanatory view showing a state of particulate collection and separation at the upper part of the center cylinder.

In FIG. 1, reference numeral 1 denotes a crude solid-liquid separator, 2 denotes a precision solid-liquid separator, and 3 denotes a decolorizer.

The coarse-solid-liquid separation device 1 is a device for adding a coagulant to water to be treated and aggregating and separating coarse solids in the water to be treated. As shown in FIG. 1a
, A coagulant addition section 1c provided in the middle of the introduction path 1b, a discharge path 1d for discharging coarse solids coagulated and separated in the separation tank 1a, and a separation tank 1b.
and a derivation path 1e for deriving water to be treated from a.

The precision solid-liquid separator 2 is for separating the water to be treated, from which coarse solids have been separated and removed by the coarse and solid-liquid separator 1, into fine particle concentrates and treated water, as shown in FIG. An outer cylinder 2a formed of a cylindrical body, a pair of lids 2b and 2c for closing both ends of the outer cylinder 2a, and the outer cylinder 2a
The inner cylinder 2d, 2e disposed in the inner cylinder, the center cylinder 2f disposed in the inner cylinder 2d, 2e, and the outer cylinder 2
a outer vortex flow generating means 2g for supplying the water to be treated mixed with gas into the outer cylinder 2a so that the water to be treated is swirled while generating air bubbles along the line a. And a concentrate discharge passage 2h for discharging the fine particle concentrate separated by centrifugal force acting outside, and the separated water from which the fine particle concentrate has been separated is passed through the double inner cylinders 2d and 2e. At this time, in order to collect the fine particles in the separated water by bubbles in the water to be treated and to separate them by filtration, the filtration units 2i, 2j formed of a large number of through holes formed in the double inner cylinders 2d, 2e; The separated water permeated into the double inner cylinders 2d and 2e is swirled in the opposite direction together with the air bubbles to move the air bubbles toward the center according to the static pressure difference generated in the radial direction. A mixed vortex is generated, and this gas-water mixed vortex Ri to concentrate the microparticles double inner cylinder 2
d and 2e are discharged to the outside from the upper periphery and discharged as fine particle concentrate from the concentrate discharge passage 2h, and the remaining separated water is again passed through the circulation passage 2k from the upper center of the double inner cylinders 2d and 2e. Inside vortex generating means 2m for tangentially recirculating from the lower portion between the double inner cylinders 2d and 2e, and fine particles formed in the double inner cylinders 2d and 2e by bubbles in the gas-water mixed vortex. And a central tube 2f that leads the treated water from which water has been collected and separated to the outside from below.

The double inner cylinders 2d and 2e are disposed over the entire length of the outer cylinder 2a in the vertical direction, and are configured so that the upper part is reduced to a conical shape to increase the efficiency of separating fine particles. ing.

The filtration units 2i and 2j are composed of double inner cylinders 2d and 2d.
The upper part is formed from the conical part of e.

The center tube 2f is disposed below the filtration units 2i and 2j in the double inner tubes 2d and 2e. As shown in FIG. 2B, the upper end of the center tube 2f is formed as a conical portion 2f ', and has a drooping tube 2f "which is drooped downward at the center thereof, and a lower portion of the center tube 2f. Is connected to an outlet 2n for treated water.

The outer vortex flow generating means 2g supplies the treated water from which coarse solids have been separated and removed by the coarse / solid liquid separating apparatus 1 to an outlet path 1e.
A tangential flow is introduced into the outer cylinder 2a from the lower part thereof through the introduction path 2o connected to the outer cylinder 2a to generate a swirling flow in the outer cylinder 2a.
p is provided.

The decolorizing device 3 performs a decoloring process by adding an appropriate decolorizing agent (eg, lime) to the treated water separated by the precision solid-liquid separating device 2. As shown in FIG. A tank 3a and an introduction path 3b for introducing the treated water derived from the discharge path 2n of the precision solid-liquid separation device 2 into the decolorization treatment tank 3a.
And a decolorizing agent adding section 3c provided in the middle of the introduction path 3b.
And an outlet 3d for extracting purified water from the decolorizing tank 3a.

The embodiment of the water purification apparatus of the present invention has the above-described configuration, and the operation will be described next.

First, in the crude solid-liquid separation device 1, coarse solids contained in the water to be treated are separated and removed. A coagulant is added to facilitate this separation and removal. Next, the water to be treated, from which coarse solids have been separated and removed by the crude solid-liquid separator 1, is introduced into the precision solid-liquid separator 2. Here, first, fine particles having a large specific gravity contained in the water to be treated are discharged outward from the vortex in accordance with the centrifugal force and the static pressure difference generated by swirling the water to be treated in the outer cylinder 2a by the outer vortex generating means 2g. And discharged to the outside from the concentrate discharge path 2 at the upper side, and the fine particles having a low specific gravity contained in the water to be treated are moved to the center of the vortex, and the air bubbles generated in the center together with the air bubbles generated at the center Fine particles having a small specific gravity are lifted and discharged to the outside from the concentrate discharge passage 2 above.
Then, when the separated water generated by the separation of the fine particles having a large specific gravity by the outer vortex flow generating means 2g passes through the filtration units 2i and 2j of the double inner cylinders 2d and 2e,
Since the fine particles in the separated water are collected by the bubbles, the fine particles having a small specific gravity are prevented from being entrained in the permeated water. That is, the filtration units 2i, 2 of the double inner cylinders 2d, 2e
In j, the fine particles are collected by bubbles attached so as to cover a large number of through-holes, so that the filtration is performed well.

The inner vortex generating means 2m is configured to generate a vortex in the opposite direction to the outer side inside the double inner cylinders 2d and 2e. Fine particles having a large specific gravity are sequentially separated to the outside in accordance with the centrifugal force generated by the swirling flow of water, and are sequentially discharged from the top through the concentrate discharge path 2h. Double inner cylinder 2
The water permeated between and inside d and 2e rises by forming a gas-water mixed vortex while collecting fine particles by bubbles contained in the permeated water, and again from the circulation path 2k, the double inner cylinder 2d, 2e
During which time filtration is performed. In the upper part of the central cylinder 2f, as shown in FIG. 2B, air bubbles adhere to the upper surface of the conical portion 2f ', and the air bubbles are contained in water flowing down from the central hanging cylinder 2f ". The water traps the trapped fine particles and rises together with the air-water mixing vortex formed in the center to reach the circulation path 2k. On the other hand, the water passing through the hanging cylinder 2f " And flows down the central cylinder 2f while being discharged into the air-water mixed vortex, and is drawn out from the lower outlet path 2n.

The treated water led out from the outlet 2n is:
After being introduced into the decolorizing treatment tank 3a from the introduction path 3b, the decolorizing agent is added from the decolorizing agent adding section 3c on the way, and subjected to the decolorizing treatment in the decolorizing processing tank 3a, it is led out from the lead-out path 3d.

[0019]

As described above, according to the present invention,
After the coarse solids in the water to be treated are separated and removed by the coarse and solid-liquid separator, the fine solids and colloid particles are precisely separated and removed by the precision solid-liquid separator to prevent overload of the precision solid-liquid separator. For a long period of time, continuous operation is possible, and finally, the water can be purified by decolorizing treatment with a decoloring device.
In the precision solid-liquid separation device, the structure is simple due to the centrifugal force separating action by the swirling flow and the static pressure drop by the inner and outer double vortex generating means in the opposite swirling direction and the fine particle collecting action by the inclusion of bubbles. An apparatus suitable for separating and removing fine particles and colloid particles having a small specific gravity can be obtained, and a water purification apparatus for efficiently purifying water to be treated such as industrial wastewater in a short time in a small space can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of the entire water purification apparatus of the present invention.

FIG. 2A is an enlarged explanatory view of a precision solid-liquid separation device,
(B) is an explanatory view showing the state of particulate collection and separation at the upper part of the center cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coarse solid-liquid separation apparatus 1a Separation tank 1b Introduction path 1c Coagulant addition part 1d Solid discharge path 1e Outlet path 2 Precision solid-liquid separation apparatus 2a Outer cylinder 2b, 2c Lid 2d, 2e Double inner cylinder 2f Center cylinder 2f 'conical portion 2f "hanging tube 2g outer vortex generating means 2h concentrate discharge path 2i, 2j filtering section 2k circulating path 2m inner vortex generating means 2n outlet path 2o introduction path 2p gas mixing section 3 decolorizing device 3a decolorizing treatment tank 3b Introductory path 3c Decolorizing agent addition section 3d Outgoing path

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D015 BA19 BA23 CA20 EA02 FA13 4D037 AA11 AB02 BA03 CA08 4D062 BA19 BA23 CA20 EA02 FA13

Claims (1)

[Claims] 1. A crude solid-liquid separator for adding a flocculant to treated water to separate coarse solids in the treated water, and a treated solid water separated from the treated solids by the coarse solid-liquid separator. A precision solid-liquid separation device for separating into fine particle concentrate and treated water, and a decolorization device for adding a decolorizing agent to the treated water separated by the precision solid-liquid separation device to purify the water; The separating device comprises an outer cylinder formed of a cylindrical body, a pair of lids for closing both ends of the outer cylinder, a double inner cylinder disposed in the outer cylinder, and a double inner cylinder. A central cylinder disposed in the cylinder, and an outer vortex flow generating means for supplying the water to be treated mixed with gas into the outer cylinder so as to swirl and flow the water to be treated while generating bubbles along the outer cylinder. And a concentrate discharging device for discharging the fine particle concentrate separated by centrifugal force acting according to the swirling flow of the water to be treated to the outside. Channel, the separated water from which the fine particle concentrate is separated is allowed to pass through the double inner cylinder, and at this time, the fine particles in the separated water are collected by bubbles in the water to be treated and filtered and separated. A filtration section consisting of a large number of through holes formed in the double inner cylinder, and the separated water permeated into the double inner cylinder is swirled in the opposite direction to the above together with the bubbles, thereby being generated in the radial direction. The air bubbles are moved toward the center according to the static pressure difference to generate a gas-water mixing vortex, and the particles are concentrated by the gas-water mixing vortex and discharged from the upper periphery of the double inner cylinder to the outside to concentrate the particles. Inner vortex flow generating means for discharging the remaining separated water from the concentrate discharge passage as a material and returning the remaining separated water from the upper center of the double inner cylinder via the circulation path and again tangentially from the lower portion between the double inner cylinders And the air-water mixing vortex disposed in the double inner cylinder and A water purification device, comprising: a central cylinder that guides treated water, in which fine particles are collected and separated by air bubbles in a flow, to the outside from below.