JPS6025197B2 - Alcohol waste treatment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, an electrolytic cell 1 is divided into a plurality of compartments la, lb, and lc, and heated alcohol waste liquid is introduced into the electrolytic cell 1 and sequentially sent to the plurality of compartments la, lb, and lc. , suspended solids suspended in the waste liquid are transferred to multiple compartments la, lb, l of the electrolytic cell 1.
Coagulation and separation are carried out in sequence in c, and each compartment la, lb, l
This alcohol waste liquid is characterized in that the scum and bubbles generated in c are collected and sent to the floating substance frame tank 8, and the waste liquid that is returned to a liquid state by being collected in the floating substance fly frame tank 8 is returned to the branch room. The purpose of this invention is to provide a method for treating alcohol waste liquid that can be processed with little power consumption when recovering suspended substances present in alcohol waste liquid.

The present invention will be explained in detail below with reference to Examples.

The alcohol waste liquid that is discarded during the distillation stage of the alcohol produced from Nukamitsu contains impurities such as proteins, sugars, and ash in the form of colloids, making it black and cloudy. The sugar content is approximately 2%, the ash content is approximately 2.3%, the solid content is approximately 8%, and the remainder is water. FIG. 1 shows a schematic process diagram for removing suspended substances present in these alcohol waste liquids. 2 in the figure is the raw water tank, which holds approximately 1 part of the raw alcohol waste solution in water.
It is designed to be diluted 1:1. The alcohol waste liquid that has been diluted in the raw water tank 2 is sent to the heating tank 3, heated to about 40 060cc by the heater 3a, and then heated to the heating tank 3.
The electrolyte is then introduced into an electrolytic cell 1 suitable for use in the electrolysis cell, where an inorganic flocculant such as aluminum hydroxide or polyaluminum chloride is added. The electrolytic cell 1 has aluminum electrode plates 4, 4
A plurality of electrode plates 4 are arranged at appropriate intervals, and a DC power source 5 that can variably apply a voltage of about 30 V between each electrode plate 4 is connected to the electrode plate 4. Each electrode plate 4, 4
When a voltage is applied between them, mountain ions are eluted into the waste liquid at the anode, and hydroxide ions in the waste liquid combine with these AI ions to produce aluminum hydroxide, and the aluminum hydroxide acts as a flocculant. , the suspended solids in the heated alcohol waste liquid are coagulated on the surface of aluminum hydroxide. At the cathode, hydrogen ions in the waste liquid are supplied with electrons to generate hydrogen bubbles, and floating substances with low specific gravity in the waste liquid are adsorbed to these bubbles and separated by flotation. Further, at this time, the organic substances in the heated alcohol waste liquid are oxidized by the electrons supplied from the electrode plate 4, and the organic substances are oxidized and decomposed to decolorize the turbidity in the waste liquid. The electrolytic cell 1 is divided into a plurality of compartments la, lb, and lc by a partition plate 6, and the waste liquid treated in the electrolytic cell 1 is transferred from the through hole 7 at the lower end of each partition plate 6 to the subchamber next to Hiharaji. It is designed to be sent to 8 in the diagram
is a suspended matter tank, which collects scum and bubbles that have surfaced in each compartment and returns the waste liquid to a complete liquid state to the first compartment la of electrolytic cell 1. . 9 in the diagram
1 is a flocculation tank, in which the waste liquid coagulated and separated in the electrolytic tank 1 is collected, an organic flocculant is added thereto, and it is poured into a tank. The waste liquid washed here advances to a sedimentation tank 10, the supernatant liquid purified by sedimentation is introduced into a treated water tank 11, and the treated water is discharged to the outside. Here, a part of the treated water in the treated water tank 11 is returned to the flocculation rope slag tank 9 again, and the flocculation loss slag tank 9
It is designed to improve the coagulation rate. The sludge settled in the settling tank 10 has a water content of about 40~
The water content is adjusted to about 50% and accumulated in one place, and the water generated in the dehydrator 12 is also returned to the coagulation rope frame tank 9. In this embodiment, an example is shown in which the alcohol waste liquid is stored in the raw water tank 2 and then sent to the heating tank 3, but the alcohol waste liquid may be immediately put into the heating tank 3 together with water. Figure 1 is a graph showing the relationship between the wastewater temperature and the power consumption per night of wastewater when a certain amount of alcohol waste liquid is treated by the above process.
Fox (L) x 14 Skin (W) x 25 Enemies (H) 1 to 1 electrolytic tank
Arrange 4 electrode plates 4 of 6 skins x 13 skins at intervals of 3 sides, dilute 1.5 ml of undiluted alcohol waste solution with 1.5 ml of water,
A voltage of 5 V to 8 V was applied and a current of 10 A to 1 hi was applied for about 1 hour without adding an inorganic flocculant. This result C. 0. The alcohol waste liquid, which was black due to blood with D of 4200, was C. 0. D is 16,000 skin, the color is competitive white, and as is clear from the graph, when the temperature of the alcohol waste liquid reaches about 30°C or higher, a noticeable trend in the decrease in power consumption begins to appear, and when it reaches about 50°C or higher, the power consumption decreases. The power settles to a low, approximately constant value. Figure 3 is a graph showing the relationship between the power consumption per night of alcohol waste liquid and the amount of inorganic flocculant added, obtained from an experiment conducted under the same conditions as above except for the addition of an inorganic additive. The temperature of the waste liquid is about 5
The test was carried out at 0°C. As a result, it was found that power consumption does not decrease even if an inorganic flocculant is added above a certain value, and therefore there is no direct proportional relationship between the addition of a flocculant and the reduction in power consumption, and the power consumption is lower than that of alcohol waste liquid. It is thought that it is influenced only by temperature. In this embodiment, a heater 3a is provided in the heating tank 3 to heat the alcohol waste liquid to approximately 40 to 60 o'clock and then send it to the electrolytic tank 1. Since the alcohol waste liquid is discharged at a temperature of about 70 to 80 degrees, the alcohol waste liquid may be directly fed into the electrolytic cell 1 while maintaining its temperature without being cooled. As described above, the present invention divides an electrolytic cell into a plurality of subchambers, puts heated alcohol waste liquid into the electrolytic cell and sequentially sends it to the plurality of subchambers, and removes suspended substances suspended in the waste liquid from the electrolytic cell into a plurality of subchambers. Since coagulation and separation are performed sequentially in the separate chambers, the power consumption required to coagulate and separate a certain amount of alcohol waste liquid can be significantly reduced compared to the case where coagulation and separation is performed without heating. Alcohol waste liquid treatment can be performed with a small amount of power consumption, and the cost required for alcohol waste liquid treatment can be significantly reduced.

In addition, since the suspended solids suspended in the waste liquid are coagulated and separated in sequence in multiple compartments of the electrolytic cell, the alcohol waste liquid is not coagulated and separated in a single cell, but is coagulated and separated in multiple compartments in sequence. As a result, the electrolysis efficiency can be significantly improved.In addition, the scum and foam generated in each subchamber are collected and sent to the floating waste tank, and the floating waste waste tank is used to collect them and turn them into a liquid state. Since the returned waste liquid is sent back to the separate chamber, the coagulation and separation of suspended solids in the electrolytic cell can be performed more effectively. There is an advantage.

[Brief explanation of the drawing]

Figure 1 is a schematic process diagram showing one embodiment of the present invention, Figure 2 is a graph showing the relationship between the power consumption and the temperature of the alcohol waste liquid, and Figure 3 is the power consumption and the amount of flocculant added. FIG. 4 is a schematic perspective view showing an electrolytic cell used in the above experiment, and 1 is an electrolytic cell. Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 Divide the electrolytic cell into multiple compartments, put the heated alcohol waste liquid into the electrolytic tank, and sequentially send it to the multiple compartments.
The suspended solids suspended in the waste liquid are sequentially coagulated and separated in multiple compartments of the electrolytic cell, and the scum and foam generated in each compartment are collected and sent to the suspended solids stirring tank, where they are agitated. A method for treating alcohol waste liquid, characterized in that the waste liquid is returned to a liquid state through a process and then returned to a separate chamber.