JPS61111187A - Apparatus for separating oil in waste water by aeration and flocculation - Google Patents

Abstract

PURPOSE:To purify waste water by allowing waste water to flow zigzag in the vertical direction by plural rectification baffle plates vertically arranged, blowing out air foam from the lower part of each partition, and sphering oil scum which is separated. CONSTITUTION:Plural rectification baffle plates 7', 7'', and 7''' arranged vertically and having alternately an clearance at the upper and the lower part are provided in a horizontal vessel 1 to allow waste water flowing into the vessel to flow zigzag in the vertical direction, and diffusers 8, 8', 8'', and 8''' for blowing out air foam are arranged at the lower part of each partition separated by the rectification baffle plate. The waste water in the partition is circulated by the air lift effect of the air foam blown out from the diffuser, the oil in the waste water in aerated, flocculated, sphered, and separated, the waste water successively purified is transferred to the succeeding partition, and finally the separated sphered oil scum is retained by baffle plates 9 and 10. The purified waste water is discharged from a discharge pipe 11.

Description

Detailed Description of the Invention (5) Field of Industrial Application The present invention relates to an apparatus for aerating and coagulating oil contained in domestic wastewater, and particularly for separating oil scum into spheres in a skillful and effective manner. This invention relates to a steam coagulation and separation device for oil in wastewater that is ideal for pollution prevention, resource saving, and energy saving, making it usable by cleaning and recycling.

(B) Prior art (A) Additional relationship The present invention is disclosed in Japanese Patent No. 119164 (Japanese Patent Publication No. 58-255
This is an additional patent for ``Flag Coagulation Separation Apparatus for Oil in Wastewater'' (No. 18), which uses the main components of the original patent as the main parts of the invention and achieves the same purpose.

That is, in the original patent, the drain oil tank is divided into several sections with a rectifying bubble plate, and the waste water is moved through the bottom and over the top, and in each section, air bubbles are released from a differential user located eccentrically from the bottom of the cylindrical tank. As a result, the waste water is circulated along the cylindrical wall to decompose organic matter such as kitchen waste, and the waste oil is oxidized and decomposed, thereby producing oil balls.The floating balls are scooped out several times a year to drain the oil. This is an energy-saving device that allows wastewater to be easily removed and waste water to be purified and recycled.

In the present application, we have confirmed that the purpose can be sufficiently achieved even if the shape of the tank is not limited or the position of the differential user is not limited, for example, by placing it in the middle of the bottom, and we have filed an additional application for these improvements.

(B) Conventional technology (B) General Conventionally, domestic wastewater from specific facilities such as cafeterias, school lunch centers, restaurants, hotels, and inns contained oil and other filth and was disposed of by transferring it to an oil storage tank. Food scraps settled and rotted in the oil separation tank, and floating material was generated from the oil removal, forming a scum that became a source of insects, insects, and other pests. In addition, the foul odor of toxic gas produced by decomposition was causing secondary pollution. In my senior years, I had managed to treat the wastewater by cleaning it several times using a Nokkyum truck, but it was incomplete and the purification of the wastewater was insufficient, so I needed help with other treatment methods. There was also a defect in the equipment that caused leaked oil to accumulate on the walls of the drain tube and block it.

In recent years, there has been a ``pressure flotation method'' that has advanced this method, but this method requires that the floating oil be pumped up and the purification of the wastewater is insufficient.

(Q Problems that the invention aims to solve As local governments have added stricter regulations to the standard for oil content in wastewater of 30 PPM, it has become difficult to obtain wastewater that passes the standard using conventional methods. There has been a deep desire for a device that can produce recyclable clean wastewater in a manner that does not require as much labor as possible, in order to prevent pollution, conserve energy, and conserve resources while adhering to high standards.

q Purpose Therefore, the purpose of the present invention is to prevent and save pollution by obtaining wastewater that does not cause secondary pollution such as bad odors, does not require the removal of floating oil scum, and has a sufficient cleanliness value suitable for recycling. An object of the present invention is to provide a waterfall coagulation separation device for oil in wastewater that is suitable for saving resources and energy.

Other objects and features of the present invention will become apparent from the following description and accompanying drawings.

(5) Means for solving the problem In the present invention, in order to bring the filth in the wastewater into sufficient contact with air, that is, aerate it, a vertical rectifying baffle plate is placed in the tank, and a differential user is installed in each compartment. The wastewater is circulated through the air bubbles, oxidized and decomposed, and the dirt and waste oil form a ball, which grows and floats.The wastewater passes over and under the rectifying nozzle plates in each compartment and is purified in each compartment. However, unlike the original patent, the feature of the present invention is that, as a means to achieve this purpose, improvements have been made to sufficiently achieve the purpose and purpose without limiting the shape of the tank and the position of the differential user. I'm glad I went there.

(F) Effect Next, the effect of aeration coagulation separation, which is the gist of the present invention, will be described below.

Conventional oil separation tanks not only require extra manpower to scoop up the floating oil and transfer it to the oil storage tank, but also cause secondary pollution due to decay, etc., as described above.

In this device, when there is no inflow of wastewater such as at night, the differential user attached to the tank is detected by the sensor 3 of the inflow pipe 2, and when air bubbles are released from the differential user 8, the wastewater rises due to the air lift effect of the air bubbles. 2nd and 3rd, guided by the wall
．． Circulation is performed in a circular motion as shown in Figure 4, and the air bubbles come into contact with oil etc. efficiently. As a result, organic matter such as rice grains is oxidized and decomposed, and the oil comes into rotational contact with the decomposed garbage due to the flow and grows into a ball shape. According to experiments, this growth results in a ball of about 5 CrrL in six months to a year, so if necessary, the ball can be automatically and easily scooped up from the manhole 12 with a net (not shown), and subsequent processing is also easy.

Furthermore, when the time during which no wastewater flows in is short, such as at night, and it is difficult to perform aeration, coagulation, and separation completely, it is desirable to set up a tank in parallel operation and switch the tank so that sufficient aeration is achieved and the effect of the present invention is carried out.

(One Embodiment The present invention will be described below with reference to the drawings. Figure 1 is an explanatory sectional elevation view showing one embodiment of the apparatus of the present invention, and Figures 2, 3, and 4 are the same (explanatory diagram showing air bubbles and water flow). FIG.

In Figure 1, 1 is a tank made of a copper body that can handle large volumes of wastewater such as F, R, and P, which has an approximately circular shape and a rectangular cross section. It enters the tank through pipe 2.

Controller (not shown) is connected to the inlet pipe using code 4.
There is a sensor 3 connected to the drain, and when the waste water stops flowing in, the water is turned on to produce steam, which will be described later.

The tank 1 is divided into several sections by a plurality of rectifying baffle plates 7, 7', and 7'' that alternately have space above and below, and the wastewater flows through these sections in a quiet laminar flow, and the oil 6 is brought to the water surface by aeration, coagulation, and separation. Finally, due to the interaction between the nozzle plate 9 and the oil scum baffle plate 10, the oil scum remains in the tank and purified waste water is discharged through the discharge pipe 11.

Figure 2 shows an example in which the differential user is positioned in the center of the bottom of a roughly circular cross-sectional tank to perform two circulations, and Figure 3 shows an example in which the differential user is positioned near the tank wall for cross-sectional angle vehicle inspection. In addition, an example is shown in which a corner member 14 is provided at the corner of the tank to facilitate circulation, and Fig. 4 also shows an example in which a differential user is provided at the center of the bottom of the square tank to effect two circulations. This shows that the object of the present invention can be achieved by providing sufficient reflux through air bubbles without being greatly influenced by the shape of the tank or the position of the differential user.

(6) Effects In the present invention, the organic matter in the wastewater is oxidized and decomposed, and the oil is solidified into balls and removed, so the components of the wastewater are highly purified and can be recycled and reused. Become. Furthermore, when a small amount of a flocculant such as aluminum sulfate or a cleaning agent such as activated sludge is added during aeration, coagulation and separation, the additives will adhere to and grow on the balls, and the wastewater may be further purified.

This device has a simple structure, is easy to manufacture, and is inexpensive.Although it is simple to operate, it is extremely effective.It performs aeration, flocculation, and two-separation treatment to remove organic waste such as oil when it is not in use, such as at night, and eliminates harmful odors. It has great effects in preventing misplacement, making oil harmless and odorless as waste oil balls, making it easier to handle, and highly cleaning wastewater, contributing to pollution prevention, resource saving, and energy saving.

4. Additional related matters This application is patent No. 170289 (Japanese Patent Publication No. 58-25518
) is an additional patent application, which achieves the same purpose by making the main constituent features of the original patent under Article 31, Paragraph 1 of the Patent Act into the main constituent features of the present invention.

[Brief explanation of the drawing]

Fig. 1 is an explanatory sectional view showing the structure of an embodiment of the present invention, and Figs. FIG. 3 shows an example in which the differential user is located at the center of the lower part. Figure 3 shows the circulation when the tank is square and the differential user is placed near the side wall. Figure 4 is an explanatory cross-sectional view showing the circulation with the differential user at the center of the lower part. Next, the main symbols in the figure and their indicated parts are shown. 1... Tank, 2... Inflow pipe, 3... Sensor 4...
・Code, 5...Water surface, 6...Oil, 7...Rectification)
Full plate, 8... Def knee 4.9... No ζ full plate, 10... Oil scum full plate, 11
...Radiation N, pipe, 12...manhole, 13...bracket, 14...corner material. Fig. 2 12' p14 vortex sweet Fig. 1. ,” 1.1 1f

Claims (3)

[Claims] (1) The tank 1 placed horizontally has a plurality of rectifying baffle plates 7, 7', and 7'' installed vertically with space alternately above and below to flow the inflowing wastewater in a zigzag pattern up and down. Diffusers 8, 8', 8'' for blowing out air bubbles are provided at the bottom of each compartment, which are approximately separated by the baffle plate.
, 8''', and the air lift effect of the air bubbles blown out from this diffuser causes the wastewater in the compartment to circulate, causing the oil in the wastewater to form and separate in the form of waterfall agglomeration spheres, and the purified wastewater is sequentially passed through the compartment. A device for coagulating and separating oil in wastewater, characterized by a structure including an oil scum baffle plate 10 for moving and finally separating oil scum into spherical shapes in a tank and draining it. (2) The cross section perpendicular to the flow of tank 1 placed horizontally is circular, elliptical,
The apparatus for coagulating and separating oil in waste water according to claim 1, characterized by a square or polygonal structure. (3) The apparatus for coagulating and separating oil in wastewater as set forth in claim 1, characterized by having a structure including a diffuser 8 that blows out air bubbles provided in a substantially separated compartment in order to cause the wastewater to flow back into the compartment. .