JPH0463189A - Water mixture separator - Google Patents

Abstract

PURPOSE:To separate a water mixture into treated water with less impurities by providing a water evaporating dish, a heated air injection pipe and a steam condensing plate in an evaporation vessel, generating bubbles in the water mixture by the heated air and evaporating the extremely thin water film of the bubble below the b.p. of water. CONSTITUTION:A thin air injection pipe 21 having many air injection holes is provided above the evaporating dish 15 in an evaporation vessel 3, the air delivered from an air pump 4 is passed through an air heater 22, heated below the b.p. of water, e.g. at about 80 deg.C, and injected into a waste liq. from the injection pipe 21 to agitate the waste liq., and the waste liq. is frothed. As a result, innumerable bubbles are generated in the waste liq. and floated to form the bubble of an extremely thin water film on the water surface, the heat absorbing efficiency of the waste liq. is increased, the waste liq. is always agitated by the bubbles, and the evaporation of the water in the waste liq. is promoted. The water in the water mixture is efficiently separated as the treated water with less impurities.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention provides a method for separating water by evaporation from industrial waste liquids discharged from factories such as developer liquid, plating liquid, valve waste liquid, and water mixtures such as seawater. The present invention relates to a water mixture separation device.

(Background of the invention) The types of polluted water such as industrial wastewater discharged from factories are extremely diverse, and various conventional treatment methods have been used to a) separate solid and liquid (remove suspended solids) b) reduce organic matter and Various treatment devices have been put into practical use to achieve the basic objectives of oxidation of toxic substances (reduction of BOD and COD), neutralization (adjustment of pH), and removal of toxic substances (cyanide, heavy metal ions, etc.). has been done.

In particular, with the occurrence of various types of pollution during the formation of post-war industrialized society, very strict water quality standards for industrial waste liquid discharged from factories were established, and corporate managers were obliged to comply with these standards. However, it is not easy to separate solids suspended in industrial waste water.
The process generally requires considerable effort and, therefore, considerable expense.

In general, the coagulation-sedimentation method is used to treat wastewater containing inorganic suspended solids, and when the specific gravity of solids suspended in the wastewater is small, flotation separation is used. If organic matter is contained, treatment methods such as the activated sludge method, which uses microorganisms to decompose the organic matter, are adopted, but in particular, if the wastewater contains a large amount of suspended solids or has an abnormal pH, harmful substances exceeding the allowable value may be detected. , phenol, aldehyde, ketones, heavy metal ions or cyanide, multiple treatment steps such as pretreatment are required. Further, in the case of organic waste liquid with high BOD or high COD, a special treatment method is required, and a large amount of cost is required for processing waste liquid. Furthermore, industrial waste liquids that are difficult to treat due to processing costs have no choice but to be dumped into the ocean or
Alternatively, measures such as burying the waste underground have been taken, but secondary pollution may occur due to insufficient waste liquid treatment, dumping, and burying.
It leads to environmental destruction such as deterioration of the water quality of rivers, lakes, and groundwater, air pollution, and soil pollution, and has various negative effects on living things on earth.

Therefore, there is always hope for an efficient industrial wastewater treatment system that separates treated water containing as few impurities as possible from industrial wastewater, decomposes decomposable organic matter, and removes inorganic matter that cannot be decomposed by concentrating or drying and solidifying it. ing.

(Object of the Invention) A first object of the present invention is to solve the above-mentioned problems and provide a water mixture separation device that efficiently separates water contained in a water mixture into treated water with few impurities. That's true.

A second object of the present invention is also to provide a water mixture separation device that promotes water separation and organic matter decomposition.

(Features of the Invention) In order to achieve the first object, the present invention according to claim 1 provides an evaporation tank that receives a water mixture, an air pump that pumps air to the evaporation tank, and a an air heater that heats the air to below the boiling temperature of water at the front, and the inside of the evaporation tank is filled with the water mixture,
An evaporating dish for evaporating moisture, an air injection pipe for blowing the air heated by the air heater into the water mixture in the evaporating dish, and a steam condensing plate for condensing water vapor evaporated from the evaporating dish. The present invention is characterized in that air bubbles are generated in the water mixture by heated air, and an extremely thin ice film of the air bubbles is evaporated at a temperature below the boiling temperature of the water.

In addition, in order to achieve the above second object, the present invention as claimed in claim 2 further provides a magnetite addition system which is disposed between the air pump and the air heater, and which disperses and adds ultrafine particles of magnetite ore to the air. The present invention is characterized in that a device is provided so that the action of the ultrafine particles of magnetite as an auxiliary agent and the action of the magnetism of the ultrafine particles act on water and organic matter.

(Embodiment of the Invention) Figures 1 to 4 are external views of a water mixture separation device for a developer, which is an embodiment of the present invention, and Figure 1 is a front view;
FIG. 2 is a side view, FIG. 3 is a rear view, and FIG. 4 is a plan view.

A water mixture separation device 1 which is an embodiment of the present invention includes a waste liquid tank 2 that stores various waste liquids that are water mixtures, an evaporation tank 3 that evaporates water contained in the waste liquid, and a heating process in the waste liquid sent to the evaporation tank 3. An air pump 4 for blowing air, a magnetite addition device 5 for dispersing and adding ultrafine particles of magnetite into the air, a final treatment tank 6 for post-processing water separated by evaporation, a waste liquid transport pipe 7, and a first pneumatic conveyor. A pipe 8, a second pneumatic pipe 9, a first drain pipe 10, a second drain pipe 11, a solenoid valve 12 that adjusts the amount of waste liquid to be fed to the evaporation tank 3, and a residue from which water is separated. A residue discharge port 13 for taking out the residue to the outside of the evaporation tank 3, and a mechanism inside the evaporation tank 3 for taking out the residue to the outside of the evaporation tank 3 (
(described later with reference to FIG. 5).

As shown in FIG. 5 as a sectional view taken along line AA' in FIG. 4, and as shown in FIG. 6 as a sectional view taken along line BB° in FIG. 4,
The evaporation tank 3 includes an evaporation dish 15, a steam condensation plate 16, a gutter 17, a steam collection bottom 18, a residue collection section 19, and a screw conveyor 2.
0, an air injection pipe 21, and an air heater 22. Note that the air heater 22 may be provided outside the evaporation tank 3.

The periphery and bottom of the evaporation tank 3 are surrounded by a heat insulating material 23.

Various waste liquids, which are water mixtures temporarily stored in the waste liquid tank 2, are
By operating the electromagnetic valve 12, the amount of liquid introduced into the evaporation tank 3 per unit time is automatically controlled so that the liquid depth in the evaporation dish 15 is kept constant.

As shown in FIG. 5, the evaporating dish 15 of the evaporating tank 3 is slightly inclined and has a smooth surface, so that the depth of the waste liquid on the evaporating dish 15 is made as shallow as possible. ,
Evaporation efficiency is improved, and impurities (solid matter) separated by water evaporation naturally move toward the residue accumulation section 19.

A thin air injection pipe 21 having a large number of air injection holes is provided above the evaporation dish 15, and air that is sent out from the air pump 4 and heated to about 80 degrees Celsius by passing through an air heater 22 is injected. The waste liquid is blown out from the trachea 21, and the waste liquid is agitated with air to form bubbles. In addition, the air injection pipe 21
may be provided in plural numbers.

In this way, when water contained in various waste liquids that are water mixtures are evaporated, the high-temperature air supplied from the air inlet pipe 21 is injected into the waste liquid, and the waste liquid is agitated with the air, causing numerous particles to form in the waste liquid. bubbles are generated, which rise to form bubbles in an ultra-thin water film on the water surface, which improves the heat absorption efficiency of the waste liquid, and also because the bubbles keep the waste liquid in a dynamic state. Evaporation of water inside is promoted.

In the case of evaporation, which involves evaporating water at a temperature close to the boiling point of water, this is due to the physical characteristics of the various substances contained in the waste liquid.

Various impurities with a boiling point of up to 100 degrees Celsius also vaporize together with water, but if air heated to about 80 degrees Celsius is injected into the waste liquid and the waste liquid is evaporated at a temperature of about 60 degrees Celsius, the water mixture Various impurities other than water present in the waste liquid do not evaporate due to the low temperature; only water evaporates.

Then, the evaporation of water from the waste liquid, which is a water mixture, is approximately 6 degrees Celsius.
Since the treatment is carried out at 0 degrees Celsius, water can be efficiently evaporated and separated from impurities without requiring a high amount of heat to boil the waste liquid.

According to experiments, compared to the method of boiling the waste liquid, which is a water mixture, to evaporate the water, heating air at about 80 degrees Celsius is injected into the waste liquid, and the waste liquid is not kept in a static state, but is kept in constant motion by air agitation. It has been confirmed that energy efficiency can be improved approximately 50 times by evaporating the waste liquid in a temperature environment of approximately 60 degrees Celsius.

Impurities separated by evaporation of moisture are collected in a residue accumulation section 19.
Since it accumulates in water, it is discharged to the outside of the evaporation tank 3 by the screw conveyor 20, and is further dried by secondary evaporation if necessary.

The water vapor evaporated from the evaporating dish 15 collides with the inside of the vapor condensing plate 16 provided at the top, where it is naturally cooled and converted into water.
It is collected in a gutter 17 along the inside of the steam layer III plate 16, led to the final treatment tank 6 through the first drain pipe 10, and further subjected to post-treatment by filtration and precipitation in the final treatment tank 6. , is discharged from the second drain pipe 11.

The steam collecting bottom 18 is provided to prevent water vapor from condensing before colliding with the steam condensing plate 16 and falling back into the evaporating tray 15, and reduces the chimney effect by narrowing the area through which the water vapor passes during evaporation. This increases the rate of rise of steam and improves the efficiency of recovering evaporated water.

The exhaust port 24 provided at the top of the evaporation tank 3
It is a relief valve to avoid pressure rise inside the tank, and also functions to open and release steam to the atmosphere when water is not being recovered. The entire steam condensing plate 16 may be removed.

Furthermore, in the water mixture separation device 1 according to the present invention, in order to efficiently perform water separation processing, high-temperature air is injected into the waste liquid to evaporate water while stirring the waste liquid with air. Further, the air sent out from the air pump 4 is passed through a magnetite addition device 5, heated, and then injected into the waste liquid.

The magnetite adding device 5 contains acid-treated magnetite ore with a diameter of 5
It is packed with granules of about mm size, and the air is pumped into the magnetite addition device 5 by an air pump 4.

By adding such a treatment process to the air to be injected into the waste liquid, the air discharged from the air injection pipe 21 into the waste liquid contains superabundance of magnetic divalent iron salts and trivalent iron salts. The fine particles will be dispersed as a gas sol.

High-temperature air in which ultra-fine particles of magnetite ore are dispersed promotes separation and decomposition of waste liquid, and experiments have shown that high-temperature air containing ultra-fine particles of magnetite ore is injected into waste liquid to agitate the waste liquid. According to this method, the energy efficiency associated with the process of separating water from the waste liquid, which is a water mixture, is improved by about 80 times compared to the method of simply boiling and evaporating the waste liquid.

In addition, according to a method in which the water in the waste liquid is evaporated by injecting high-temperature air in which ultrafine particles of magnetite ore are dispersed into the waste liquid,
It is also possible to decompose organic substances that cannot be decomposed by the above-mentioned method of simply injecting high-temperature air into the waste liquid and evaporating the water in the waste liquid while stirring the air.

(Effect of the invention) As explained above, according to the present invention as set forth in claim 1,
It comprises an evaporation tank that receives a supply of a water mixture, an air pump that pumps air to the evaporation tank, and an air heater that heats the air to a temperature below the boiling temperature of water before the evaporation tank. an evaporation dish filled with the water mixture to evaporate water inside the evaporation tank; an air inlet pipe for blowing the air heated by the air heater into the water mixture in the evaporation dish; A steam condensing plate is provided to condense the water vapor evaporated from the evaporating dish, so that air bubbles are generated in the water mixture using heated air, and the extremely thin ice film of the air bubbles is evaporated at a temperature below the boiling temperature of water. Water contained in a water mixture can be efficiently separated as treated water with few impurities.

Further, according to the present invention as set forth in claim 2, there is further provided a magnetite adding device which is disposed between the air pump and the air heater and which adds ultrafine particles of magnetite ore to the air.
Since the action of the ultrafine particles of magnetite as an auxiliary agent and the action of the magnetism of the ultrafine particles act on water and organic matter, separation of water and decomposition of organic matter can be promoted.

[Brief explanation of the drawing]

Fig. 1 is a front view of a water mixture separation device which is an embodiment of the present invention, Fig. 2 is the same (side view), Fig. 3 is the same rear view,
4 is a plan view, FIG. 5 is a sectional view taken along the line AA' in FIG. 4, and FIG. 6 is a sectional view taken along the line BB' in FIG. 4. 1... Water mixture separation device, 2... Waste liquid tank, 3... Evaporation tank, 4... Air pump, 5... Magnetite addition Apparatus, 6... Final treatment tank, 7... Waste liquid transport pipe, 8... First pneumatic pipe, 9... Second pneumatic pipe for use, 1o...
・First drain pipe, 11...Second drain pipe, 12
...Solenoid valve, 13...Residue discharge port, 1
4...Motor,]5...Evaporating dish, 16
...Steam condensing plate, 17...Gutter, 18.
...Steam collection eaves, 19...Residue accumulation section,
20... Screw conveyor, 21...
・Air injection pipe, 22...Air heater, 23...
...Insulation material, 24...Exhaust port.

Claims (2)

[Claims] (1) A water mixture separation device that evaporates and separates water from a water mixture, comprising: an evaporation tank that receives the water mixture; an air pump that pumps air to the evaporation tank; an air heater that heats the air to a temperature below the boiling temperature of water; an evaporating dish filled with the water mixture to evaporate moisture in the evaporating tank; and an evaporating dish that evaporates water by filling the water mixture with the water mixture in the evaporating dish. A water mixture separation device characterized in that an air inlet pipe for blowing the air heated by the air heater and a steam condensing plate for condensing water vapor evaporated from the evaporating dish are provided therein. (2) The water mixture separation device according to claim 1, further comprising a magnetite adding device disposed between the air pump and the air heater for dispersing and adding ultrafine particles of magnetite to the air.