JP2008149308A - Wastewater purification apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wastewater purification apparatus which can enhance a back washing efficiency and can realize microfiltration in a small area by using an accordion-type filter. <P>SOLUTION: An accordion-type filter 11 is constructed hollow-cylindrically and stretchably in an accordion-like folded form. The accordion-type filter 11 is installed in a folded state by utilizing the force of a spring 14 in a normal state. In back washing, the filter 11 is stretched against the force of the spring 14. Thus, the back washing effect can be enhanced, and the deposit on the surface of the outer circumference of the filter 11 can be precipitated on a discharge belt conveyor 7. Consequently, the back washing effect can be enhanced, and microfiltration can be realized in a small area. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wastewater purification device that purifies wastewater.

The conventional backwash type filter folds the filter paper and arranges it in a ring shape. When purifying the wastewater, the wastewater flows from the outer peripheral surface to the inner direction. It was backwashed with purified water at a flow rate.
In addition, other conventional backwash type filters use a helical spring, and when purifying wastewater, the wastewater is circulated inward from the outer peripheral surface of the helical spring, and during backwashing, purified water is passed from the inside toward the outer peripheral surface. The back was washed by extending the spring.

Problems to be solved by the invention

The conventional backwash type filter is constructed as described above, and the filter paper folded and arranged in a ring shape can be microfiltered, but there is almost no backwashing effect, and the filter is immediately clogged. It does n’t fit.
On the other hand, a device using a helical spring can provide a backwashing effect, but has a small water flow area and is almost impossible to perform microfiltration, which is not suitable for the actual situation.

  The present invention comprises a bellows type filter, for example, a filter paper or a filter cloth, which is folded in a hollow cylindrical shape and a bellows shape that can be expanded and contracted, and is normally installed in a state folded by a spring force. And at the time of backwashing, it aims at providing the waste water purification apparatus which can raise a backwashing effect by extending a bellows type filter against a spring force, and can perform microfiltration with a small area.

  The means for solving the above problems are configured in a septic tank into which waste water is poured, a belt conveyor that discharges precipitates to the outside of the septic tank, a hollow cylinder, and a bellows that is telescopically folded. The bellows type filter that is folded by the inner surface and purifies by passing waste water from the outer peripheral surface to the inside, and backwashing from the inside of the bellows type filter to the outer surface during backwashing, resisting the spring force It was configured to stretch.

An embodiment of the present invention will be described below with reference to FIGS.
1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a front sectional view of FIG. 1, and in the figure, waste liquid 2 from a machine tool 1 is passed through an adsorbent storage container 3 to a septic tank 4. It is poured into the dirty tank 5.
In the adsorbent storage container 3, an adsorbent 6 containing magnesium hydroxide as a main component is placed, for example, in a cloth bag, and the waste liquid 2 is removed by OH groups eluted from the magnesium hydroxide into the waste liquid. While maintaining the pH value at 9 to 10 to prevent the waste liquid 2 from deteriorating, it always elutes so that the magnesium ion concentration in the waste liquid 2 is about 10 ppm to promote the aggregating action of the fine particles in the waste water 2.

FIG. 3 shows the charge zero point characteristics of magnesium hydroxide, the horizontal axis represents the pH value, and the vertical axis represents the concentration. Charge 0 point: In a liquid in a pH region lower than pH 12,
From the equilibrium of Mg (OH) ₂ = Mg (OH) ⁺ OH ⁻ , Mg (OH) ⁺ is likely to occur, the surface of Mg (OH) ₂ is charged to +, and OH ⁻ is increased in the liquid. Shows basicity.
For this reason, the pH value of the waste liquid 2 is maintained at 9 to 10, and a decrease in the pH value due to deterioration of the coolant liquid, the cleaning liquid, etc. is prevented, and it is possible to cope with the prevention of the occurrence of rust in the cooling pipes.
In addition, the fine particles, fine oil, etc. in the waste liquid 2 are charged to-, and are attracted to the surface of Mg (OH) ₂ charged to +, and the mutual distances between the fine particles, fine oil, etc. are mutually attractive. Becomes narrower than the working distance, and agglomerates to increase the precipitation rate of the fine particles in the waste liquid 2, and the fine oil floats to the liquid surface.
Further, Mg (OH) ₂ has a property of elution of magnesium ions so that the concentration of magnesium ions in the waste liquid is always about 10 ppm, and this magnesium ion promotes the aggregating action of fine particles in the waste liquid.

In this way, the fine particles in the waste liquid 2 settle on the belt conveyor 7 installed in the dirty tank 5 and are discharged out of the dirty tank 5.
For example, the belt conveyor 7 sets the moving speed for 1 minute as very slow as 10 cm so that the fine particles deposited on the belt conveyor 7 are not diffused into the waste liquid 2.
Further, a protrusion 8 is provided on the belt conveyor 7, and when the protrusion 8 comes out of the liquid surface 9 from the waste liquid 2 of the dirty tank 5, the upper surface of the protrusion 8 is substantially parallel to the liquid surface 9. Provided to prevent the fine particles deposited on the protrusions 8 from diffusing into the waste liquid 2.
The angle of the upper surface of the protrusion 8 with respect to the liquid surface 9 is ideally in a substantially parallel state, but it is necessary to have a slight angle so as to scavenge the fine particles deposited on the protrusion 8.

The fine particles that do not settle on the belt conveyor 7 are pumped into the clean tank 12 by the pump 10 through the bellows filter 11 together with the waste liquid 2 in the dirty tank 5, and the waste liquid flows inward from the outer peripheral surface of the bellows filter 11. 2 flows and is filtered on the outer peripheral surface of the bellows type filter 11.
The bellows type filter 11 is configured by folding a filter paper or a filter cloth into a hollow cylindrical shape and an accordion type or an Odawara lantern in a bellows shape so as to be freely stretchable. As shown in FIG. It is installed in a container 13 having a large number of gaps, and is always folded by the spring force of the spring 14.
At the time of backwashing, the pump 10 is rotated in the reverse direction so that the cleaning liquid in the clean tank 12 flows from the inside of the bellows type filter 11 toward the outer peripheral surface, and the bellows type is resisted against the spring force of the spring 14 as shown in FIG. The filter 11 is extended to perform backwashing effectively.
The fine particles deposited and deposited on the belt conveyor 7 by this backwashing are discharged out of the dirty tank 5 by the belt conveyor 7.
The purified water in the clean tank 12 thus purified is sent to the machine tool 1 by the pump 15.

FIG. 6 is a front sectional view showing another embodiment of the present invention. As shown in FIG. 7, the upper surface of the protrusion 8 is formed so that the fine particles 16 on the belt conveyor 7 are scooped together with the waste liquid 2 as shown in FIG. For example, 3 to 5 degrees with respect to the liquid level 9 in the width direction of the belt conveyor 7 as shown in FIG. The waste liquid 2 scooped together with the fine particles 16 is slowly returned to the dirty tank 5 so as not to diffuse the fine particles 16 into the waste liquid 2.
In this case, the distance of the protrusion 8 in the width direction of the belt conveyor 7 is long, and the waste liquid 2 scooped together with the fine particles 16 is slowly returned to the dirty tank 5 without diffusing the fine particles 16 into the waste liquid 2. Can do.

FIG. 9 is a front sectional view showing still another embodiment of the present invention. The adjuster 17 inclines the protrusion 8 in the width direction of the belt conveyor 7.
That is, the effect of the embodiment of FIG. 6 is obtained by providing the adjuster 17 in the embodiment of FIG.

In the above embodiment, the bellows type filter 11 is folded by the pressing force of the spring 14, but the bellows type filter 11 may be folded by the pulling force of the spring 14.
That is, for example, two springs 14 are suspended from the upper end of the wall surface of the dirty tank 5, and both ends of the support plate are attached to the lower ends of the two springs 14, and the bellows type filter 11 is attached to the support plate. The lower surface may be fixed, and the bellows type filter 11 may be folded by the pulling force of the spring 14 at all times, and the bellows type filter 11 may be extended against the pulling force of the spring 14 during backwashing.
In addition, the pump 10 is a pump that can be rotated in reverse, and one pump is used for both filtration and backwashing. However, a pump for filtration and a pump for backwashing are provided separately. May be.

The invention's effect

  The bellows type filter is configured to be folded in a hollow cylindrical and bellows shape that can be expanded and contracted, and is always installed in a folded state by a spring force. During backwashing, the bellows type filter is resisted against the spring force. By extending the length, it is possible to increase the backwashing effect and to constitute a waste water purification device capable of precision filtration with a small area.

  Side surface sectional drawing which shows one Example of the waste water purification apparatus of this invention.   FIG. 1 is a front sectional view of FIG.   The figure which shows the electric charge 0 point characteristic of magnesium hydroxide.   The figure which shows the state which the spring shown in FIG. 1 folded.   The figure which shows the state which the spring shown in FIG. 1 extended.   Front sectional drawing which shows another Example of the waste water purification apparatus of this invention.   FIG. 6 is a side sectional view of the protrusion shown in FIG.   The front view of the processus | protrusion shown in FIG.   Front sectional drawing which shows the further another Example of the waste water purification apparatus of this invention.

Explanation of symbols

2: Waste liquid 4: Septic tank 5: Dirty tank 6: Adsorbent 7: Belt conveyor 8: Protrusion 11: Bellows filter 12: Clean tank 14: Spring

Claims (1)

A belt conveyor installed in the septic tank into which the waste water is poured, and discharging the sediment out of the septic tank;
A bellows that is formed in a hollow cylindrical shape and is foldable into an accordion-like shape, and is normally folded by a spring force and installed in the septic tank, and purifies by passing waste water from the outer peripheral surface to the inside. With an expression filter,
At the time of backwashing, the liquid is caused to flow backward from the inside of the bellows type filter toward the outer peripheral surface, the bellows type filter is stretched against the spring force, and the adhering matter adhering to the outer peripheral surface of the bellows type filter, A wastewater purification apparatus characterized in that it is allowed to settle on the belt conveyor.

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