JPS6322875B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for efficiently foaming, separating, and removing surfactants contained in water.

In waste water such as sewage and factory wastewater,
Many cases contain large amounts of surfactants discharged from human activities or production processes. This activator is a common method for treating organic matter. "Biological oxidation"
However, it is difficult to decompose and is extremely difficult to handle for water treatment. As a method for removing surfactants, a method using activated carbon is generally used, but the adsorption characteristics vary depending on the pH, temperature, molecular weight of the active agent, etc., and the cost is extremely high. I end up.

The present invention aims to generate bubbles in surfactant-containing water to foam and separate the surfactant from the water.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus according to an embodiment of the present invention, its operation, and processing will be described in detail below with reference to the drawings. FIG. 1 is a layout diagram of the main parts of the device, and FIG. 2 shows its processing status.
Reference numeral 1 denotes a conduit for guiding wastewater containing a surfactant, and the conduit 1 is connected to a foaming tank 2. All of the foaming tank 2 is connected with joint pipes 3 ₁ and 3 ₂ for foam growth. When sewage is sucked into ₁ , air is drawn in as shown in Figure 2, and the mixture of sewage and air causes a foaming effect.

When wastewater passes through the pipe 3 ₁ , air bubbles grow and become larger within the pipe 3 ₁ .

The sewage containing the grown bubbles is led from one end of the pipe 3 ₁ to the pipe 4 , which extends downward almost perpendicularly to the pipe 3 ₁ . ) Separate into separated water and bubbles in step 6. A water conduit 7 and a bubble pipe 8 are connected to the valve 6, and the separated water accumulated in the separation tank 5 via the water conduit 7 is drained and taken from a drain pipe 9.

The connection state of the valve 6, water conduit 7, and bubble pipe 8 is as shown in Fig. 4, and the sewage that falls at the valve 6 further generates bubbles, and the angle of inclination (α = 15° ± 5° is convenient). ), the water flows downward into the water conduit 7 and accumulates in the separation tank 5.

The grown bubbles that have fallen into the valve 6 advance through the bubble tube 8 due to the pressure caused by the falling force of the sewage, and reach a branch point 10.
The remaining water passes through the water conduit 11 and accumulates in the separation tank 5.

The bubbles containing the surfactant then proceed to the upper part of the water conduit 11 and are pushed out into the defoaming tank 13 from the outlet of the bubble conduit 12 shown in FIG. Reference numeral 14 denotes a defoaming agent storage tank, which is suctioned by a pump 15 and is injected into the defoaming tank 13 through a pipe 16 to defoam. It has been found that by providing an inclination angle of approximately 15°±5° in portions A, B, and C shown in FIG. 4, the water and air bubbles can be effectively separated. Further, by appropriately changing the inclination angle β of the bubble conduit 12 shown in FIG. 5, water droplets and bubbles can be separated, and the separation ratio of water droplets and bubbles can be changed by changing the angle β. In other words, if β is set to zero, the amount of bubbles will be large, but the amount of water droplets included will also increase, and as the angle increases, the amount of bubbles will decrease and the number of water droplets will decrease further, allowing only the bubbles to be discharged at any angle. Water droplets are injected into the water conduit 11.

When lens processing wastewater was treated using the surfactant removal device according to the present invention, the conventional COD value (chemical oxygen demand) of 3.4 ppm became 134 to 250 ppm with this device, and the TOC value ( The amount of organic carbon (organic carbon content) was about 7 ppm, but it was possible to extract it as concentrated water with a concentration of 100 to 200 ppm.

[Brief explanation of the drawing]

FIG. 1 is a layout diagram showing an example of an apparatus according to an embodiment of the present invention. FIG. 2 is an explanatory diagram showing the operation and processing status of the apparatus shown in FIG. 1. FIG. 3 is an explanatory diagram showing how sewage and air are mixed in the foaming tank shown in FIG. 2. Fourth
The figure is an explanatory diagram showing the state of the piping in the vicinity of the valve 6 in Fig. 2 and the separation pattern of sewage and air bubbles. FIG. 5 is an explanatory diagram showing the state of bubbles and water droplets near the branching point 10 in FIG. 2. 1... Sewage conduit, 2... Foaming tank, 3 ₁ , 3 ₂ ... Conduit (relay pipe), 5... Separation tank, 7, 11... Water conduit pipe.

Claims (1)

[Scope of Claims] 1. A foaming tank containing wastewater containing a surfactant is provided with a joint pipe for introducing air into the wastewater, and a foam growth joint pipe is connected to the joint pipe to lead the wastewater into a separation tank, A water conduit is provided in the separation tank substantially parallel to the foam growth joint, and a vial is connected between the foam growth joint and the water conduit while maintaining an upward slope in the direction of the water conduit. . An underwater surfactant removal device, characterized in that the upper end side of the water conduit pipe is configured to lead to a defoaming tank.