JP2011218266A - Microbubble sewage regenerating apparatus having scum mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a microbubble sewage regenerating apparatus having a scum mechanism that can discharge scum effectively.SOLUTION: The microbubble sewage regenerating apparatus having a scum mechanism includes: a water treatment tank 1 in which water to be treated flows; a plurality of partition plates 2 disposed in the water treatment tank 1; an ozone gas injection device 4 in which a part of the water to be treated in the water treatment tank 1 is extracted and mixed with ozone gas; a high pressure pump 5 in which the gas-liquid two-phase flow mixed by the ozone gas injection device 4 raises voltage; a microbubble generator 6 in which the gas-liquid two phase flow with raised pressure by the high pressure pump 5 is jetted from a plurality of small holes to generate microbubbles; and a scum outlet 10 in which a helical water stream guide is provided inside to remove generated scum during the microbubbles generated by the microbubble generator 6 flow down in the water treatment tank 1.

Description

  The present invention relates to a microbubble sewage system provided with a scum mechanism capable of removing scum adhering to a wall surface of a scum discharge port attached to a microbubble sewage regeneration apparatus and a scum that is enlarged and cannot get over the edge of the discharge port. The present invention relates to a playback device.

  The microbubble sewage reclaiming device is a device that purifies treated water by making ozone into fine bubbles.

  According to [Non-Patent Document 1], fine bubbles are bubbles having a diameter of 50 micrometers or less and are generally called microbubbles. Bubbles of such a size dissolve completely in the surrounding fluid and are completely dissolved in about 2 minutes by shrinking in the liquid. The fine bubbles are dissolved in the surrounding liquid and the diameter thereof is reduced, so that the pressure becomes high at a high temperature due to the effect of increasing the surface tension. In addition, since the surface area ratio with respect to the volume increases as the bubbles become finer, the dissolution efficiency increases, and the dissolution is further promoted according to Henry's law in which the solubility increases in proportion to the pressure of the gas. It is said that fine bubbles generate radicals having sterilizing power when they disappear, and these radicals can sterilize and decompose organic substances, so that they can be purified, sterilized and disinfected.

  According to [Non-Patent Document 2], it is reported that oil particles are adsorbed on the surface of microbubbles and float along with the oil particles.

  Even in a sewage recycling apparatus using microbubbles, it can be observed that a fine turbid film (hereinafter referred to as scum) contained in sewage is formed. In order to provide good quality recycled water, it is necessary to remove this scum periodically.

"Characteristics of water and new utilization technology", NTS Corporation, 2004 "The latest technology of fine bubbles", ENTS Co., Ltd., 2006

  In the sewage recycling device using microbubbles, a scum removing device is provided. However, at the scum discharge port, there is a problem that the scum adhering to the wall surface of the treated water tank or the enlarged scum cannot get over the discharge port. Remains, adheres to the vicinity of the scum outlet and cannot be discharged.

  An object of the present invention is to provide a microbubble sewage recycling apparatus having a scum mechanism that can effectively discharge scum.

  In order to achieve the above object, a microbubble sewage regeneration apparatus equipped with a scum mechanism of the present invention includes a water treatment tank into which water to be treated flows, a plurality of partition plates installed in the water treatment tank, and a water treatment An ozone gas injection device that extracts a portion of the water to be treated in the tank and mixes it with ozone gas, a high-pressure pump that boosts the gas-liquid two-phase flow mixed by the ozone gas injection device, and a gas-liquid two boosted by the high-pressure pump A microbubble generator that generates microbubbles by ejecting a phase flow from a plurality of small holes, and a scum that is generated when the microbubbles generated by the microbubble generator flow down the water treatment tank. It has a scum outlet with a spiral water flow guide on the inside.

  According to the present invention, a vortex can be generated in the drainage at the scum discharge port to effectively remove the scum near the scum discharge port, and the scum can be discharged smoothly.

The block diagram of a micro bubble sewage reproduction | regeneration apparatus. The perspective view which expanded the scum discharge port. The processing flowchart when discharging scum.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of the water treatment facility of this embodiment.

  The water treatment tank 1 is provided with a plurality of partition plates 2a to 2c, and the water treatment tank 1 is partitioned into a plurality of zones. The partition plate 2 has partition plates 2a and 2c with fixed upper portions and partition plates 2b with fixed lower portions alternately installed. From the upper side of the water treatment tank 1 on the upstream side of the partition plate 2a, sewage treated water (hereinafter, covered) Treated water).

  Outside of the water treatment tank 1, the ozone generator 3, the pipe 16 for guiding the ozone gas generated by the ozone generator 3 to the ozone gas injection device 4, and the water to be treated partially extracted from the lower part of the water treatment tank 1 are taken in. The ozone gas injection device 4 that mixes ozone gas guided by the pipe 16 into the water to be treated, the high-pressure pump 5 that boosts the gas-liquid two-phase flow mixed by the ozone gas injection device 4, and the gas-liquid two that is pressurized by the high-pressure pump 5 The microbubble generation device 6 that guides the phase flow through the pipe 17 and ejects from a plurality of small holes to generate microbubbles, and the microbubbles generated by the microbubble generation device 6 to the upstream side of the partition plate 2 a of the water treatment tank 1. A pipe 18 for guiding is installed.

  Here, the ozone gas injection device 4 is of an ejector type, a diffuser type, or a gas-liquid mixing type that directly mixes, and the high pressure pump 5 has a vortex pump excellent in two-phase flow discharge performance. Although desirable, common pumps can also be used.

  A scum discharge port 10 is installed in the upper part of the partition plate 2b between the partition plate 2a and the partition plate 2c, a discharge pipe 20 is provided in the center of the scum discharge port 10, and a scum discharge is provided in the discharge pipe 20. A valve 11 is attached. As shown in FIG. 2, the scum discharge port 10 is provided with a spiral guide 30. The scum discharge valve 11 is connected to a drain pit 24 by a pipe 22.

  A float type water level gauge 13a is installed between the partition plate 2a and the partition plate 2c at a position higher than the scum discharge port 10, and detects whether the water level has reached the scum discharge port position 13b. ing.

  The upper part of the water treatment tank 1 is provided with a roof (not shown) for collecting ozone that has not reacted with the water to be treated, and the collected exhaust ozone passes through an exhaust ozone pipe 7 and is an activated carbon layer. 8 is absorbed by activated carbon and then released into the atmosphere by an exhaust fan 9.

  The treated water treated in the water treatment tank 1 is stored in the storage tank 25 as reclaimed water via the reclaimed water valve 12 and the pipe 23.

  A signal from the water level gauge 13a is fed back to the control device 14, and a signal for driving the inverter of the high-pressure pump 5, a signal for controlling the opening and closing of the scum discharge valve 11, and a signal for controlling the opening and closing of the regenerative water valve 12 are output. It is supposed to be.

  When water to be treated is injected into the water treatment tank 1 from the sewage treatment facility and the ozone generator 3 and the high pressure pump 5 are driven, an ozone gas injection device is added to the water to be partially extracted from the lower part of the water treatment tank 1. 4, the ozone gas from the ozone generator 3 is mixed to form a gas-liquid two-phase flow, which is sucked into the high-pressure pump 5 and pressurized, and then flows into the fine bubble generating device 6.

  The gas-liquid two-phase flow mixed with the ozone gas discharged from the high pressure pump 5 reaches the fine bubble generating device 6 while being partially pressurized and dissolved in the liquid, and is provided in the fine bubble generating device 6. Out of several small holes. When passing through this small hole, pressure loss occurs and the flow rate increases, so as can be seen from Bernoulli's theorem, the pressure rapidly decreases and the pressure is reduced. The so-called microbubbles are blown into the water treatment tank 1. In addition, since the flow path area increases on the downstream side, the pressure recovers, but the pressure becomes unstable due to a sudden change in the flow path area, and the bubbles further collapse into fine bubbles.

  While the fine bubbles generated in this manner sequentially flow between the wall surface of the water treatment tank 1 and the partition plate 2a, between the partition plate 2a and the partition plate 2b, and between the partition plate 2b and the partition plate 2c. In addition, it adheres to the turbidity contained in the water to be treated and floats on the water surface, and accumulates on the upper part of the partition plate 2b as accumulated turbidity, that is, scum.

  A processing procedure for periodically removing the accumulated scum is shown in FIG. In step 100, the control device 14 closes the regeneration water valve 12. By closing the regeneration water valve 12, the water level in the water treatment tank 1 rises.

  In step 101, the control device 14 that has fed back the signal from the water level gauge 13 a determines whether or not the water level is higher than the scum outlet 10. When the water level becomes higher than the scum discharge port 10, in step 102, the control device 14 opens the scum discharge valve 11 and drains the water to be treated in the water treatment tank 1 from the scum discharge port 10. Since the spiral guide 30 is provided in the scum discharge port 10, the scum adhering to the wall surface in the water treatment tank 1 and in the vicinity of the scum discharge port is effectively generated by the energy of the vortex flow due to the drainage. Can be removed.

  The controller 14 measures the scum discharge time in Step 103, and when the set time has elapsed, in Step 104, the regeneration water valve 12 is opened to lower the water level, and in Step 105, the scum discharge valve is closed.

  As described above, according to the present embodiment, the spiral water flow guide is provided inside the scum discharge port, so that a vortex flow is generated during drainage, and the scum adhering to the water treatment tank wall surface and the vicinity of the scum discharge port is removed. It can be effectively removed.

DESCRIPTION OF SYMBOLS 1 Water treatment tank 2 Partition plate 3 Ozone generator 4 Ozone gas injection device 5 High pressure pump 6 Fine bubble production | generation apparatus 10 Scum discharge port 11 Scum discharge valve 12 Reclaimed water valve 13 Water level meter 14 Control device

Claims (2)

  A water treatment tank into which the water to be treated flows, a plurality of partition plates installed in the water treatment tank, an ozone gas injection device for extracting a part of the water to be treated in the water treatment tank and mixing it with ozone gas; , A high-pressure pump that boosts the gas-liquid two-phase flow mixed by the ozone gas injection device, and microbubble generation that generates microbubbles by ejecting the gas-liquid two-phase flow pressurized by the high-pressure pump from a plurality of small holes And a scum having a scum discharge port provided with a spiral water flow guide on the inside for removing scum generated when the microbubbles generated by the fine bubble generating device flow down in the water treatment tank A microbubble sewage recycling device equipped with a mechanism.   The water treatment tank includes a reclaimed water valve for opening and closing a pipe for discharging reclaimed water, a water level meter for detecting a water level, and a scum discharge valve for opening and closing a discharge pipe connected to the scum discharge port, When removing the water, the control device closes the regeneration water valve and controls the scum discharge valve to be in an open state for a set time when it is determined that the water level measured by the water level gauge is higher than the scum discharge port. A microbubble sewage recycling apparatus comprising the scum mechanism according to Item 1.

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