JPS60175589A - Floc floating and separation apparatus - Google Patents

Abstract

PURPOSE:To almost perfectly separate and remove residual floc, by providing a fluidized tank for floating separating floc by imparting buoyancy to the same and a static flow tank for floating and separating the floc remaining in treated water in the fluidized tank. CONSTITUTION:Floc slightly containing treated water discharged from an electrolytic treatment apparatus 1 and a float separation apparatus 2 is sent to an auxiliary separation tank 3. Said floc containing treated water is sent into said separation tank 3 from an inflow port 38 and flooded over the upper end of the inside 40 thereof to be flowed into the inside 40 and only floc is flowed into a floc collector 43 from the upper opening thereof and sent to a waste oil tank B provided to the outside of said separation tank 3. On the other hand, treated water, from which almost all of floc is removed, is discharged from a discharge port 42 to be returned to an oil-containing waste water treatment tank A. Furthermore, final treated water, from which floc is almost perfectly removed, is stored in a storage tank 5 through the float separation apparatus 2 and appropriately discharged to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a treatment device for treating oil-containing wastewater containing oily content, such as bilge discharged from ships.

Generally, the oily content contained in bilge etc. is treated in an oil-water separator using a suitable F material that takes advantage of the difference in specific gravity, but the oily content is emulsified by the surfactant of the detergent used during cleaning. Therefore, it is difficult to completely separate them, especially since the marine effluent standard, which used to be 100 ppm or less, has been raised to 15 ppm or less, and the land sewage discharge standard has been raised to sppm or less. It became almost impossible to carry out processing that would pass the standards.

Therefore, in order to treat such oil-containing wastewater, a method is generally used in which aluminum or an alloy thereof is used for the anode, iron or nutless is used for the cathode, and the wastewater is subjected to direct current electrolysis. This method utilizes the floc aggregation effect of activated aluminum hydroxide generated by aluminum dissolved from the anode during electrolytic treatment, and also causes the flocs to float by adsorbing fine gases generated by the electrolytic reaction to the flocs. It is intended to be separated.

With this method, pollutants including oily substances in wastewater are formed into flocs and separated by flotation, but some of the flocs are so fine that they do not have enough buoyancy and mix into the treated water. .

In such cases, the l [111 flocs remaining in the treated water after electrolytic treatment (hereinafter referred to as raw water) are conventionally removed using a flotation separation tank that moves the raw water further up and down to separate the flocs in the raw water. The raw water is further passed between insoluble electrodes, and the flocs are adsorbed by the generated gas, giving them buoyancy and being actively floated and separated. Since the upper and lower wJs are separated, there is a problem in that the remaining fine flocs are not floated up but are dragged into the treatment water, making it impossible to remove the flocs sufficiently.

The present invention has been made in view of the above points, and its purpose is to provide a flotation separation device that can reliably separate even minute flocs that do not have sufficient buoyancy.The present invention is characterized by: This is a flotation separation device for flotation separation of unseparated flocs remaining in raw water after electrolytic treatment of oil-containing wastewater, which includes a fluidized tank for flotation separation by imparting flotation blades to the flocs, and a fluidized flow tank for flotation separation of flocs, and Each of the fluidized flow tanks has at least one static flow tank for flotation and separation of flocs remaining in the pre-processed water as a post-membrane treatment under static flow. An electrolytic cylinder communicating with the inlet is erected in the tank, and at least one pair of electrodes is attached to the lower part of the electrolytic cylinder, and has a floc collection float for a fluidized tank which floats with the upper opening upward. The lower opening of the floating body is connected to a floc discharge pipe for the fluidized tank provided on the inner wall of the tank, and a null is provided on the side wall of the tank for sending the pre-treated water to the static flow tank. a static flow volume provided adjacent to the fluidization tank, communicating with the nullit, positioned at approximately the same height as the floating body when the floc collection floating body for the fluidization tank floats, and floating with the upper opening upward; The lower opening of the floating body is connected to the floc discharge pipe for the static flow tank provided on the inner wall of the tank, and the treated water outlet is provided at the bottom of the tank.

Hereinafter, one example of an oil-containing wastewater treatment system to which the present invention is applied will be outlined, and an example of the flotation separator of the present invention will be described in detail.

FIG. 1 is an explanatory diagram of an oil-containing wastewater treatment system, which includes an electrolytic treatment device (1) that decomposes oil-containing wastewater into ν and floats and separates flocs of pollutants produced;
flotation device (
21, electrolytic treatment equipment f & (II) and flotation separation equipment (2
) and treated by an auxiliary separation tank (mainly consisting of 31 and optionally electrolytic treatment device 11) for re-separating and discharging flocs containing some treated water. In order to improve the performance, a chemical injection tank (4) is used to add additives to the wastewater, and a storage tank (4) is used to discharge the final treated water from the flotation separation device (2) to the outside at an appropriate timing. 5) is provided.

The electrolytic treatment device (1) is different from the conventional electrolytic treatment tank;
The electrolytic tank (ill) is equipped with a flotation separation tank az and a tank for flotation separation of decomposed and coagulated pollutants, and an electrolytic tank α is provided with oil-containing wastewater in the lower part of the tank body A3 with an open top. Inlet 1u4f: has at least one pair of electric wires located inside the tank body 0 and above the iii inlet circle.
R is provided, and the shape is such that an interval can be formed between the electrodes that does not impede the passage of waste water, and the main component is at least Fe.
- The flotation separation tank U is filled with a filler σG containing a large number of oxidized waves or hydroxylated waves on its surface.
It has an inner cylinder αη that covers the opening of the electrolytic tank α and stands upright at the upper end of the electrolytic tank α, and has a certain distance between it and the inner cylinder αη.
It has an outer cylinder holder erected at the upper end of the electrolytic tl (Ill) across the electrolysis tl (Ill), an intermediate cylinder a9 is provided between the rJIJ inward direction a and the outer cylinder [phase], and an inner cylinder (171 and the intermediate cylinder An inner flow path ■ is formed between the outer station [phase] and the intermediate cylinder Gg, and an outer flow path c211 is formed between the outer station [phase] and the intermediate cylinder Gg, and the inner flow path and the outer flow path +211 are formed at the lower part of the intermediate @ag. communicates, and the intermediate cylinder O
The upper part of the inner cylinder Gη is arranged above the upper part of the outer part Gη and lower than the upper part of the outer part, and the outer flow path Qυ is arranged at the upper part of the intermediate cylinder α9.
A sealing wall is provided between the upper part of the intermediate cylinder U9 and the inner wall of the outer So8 to block the air, and a lid body is installed in the upper part of the outer part to form a storage chamber (support) for storing the pollutants floated and separated. A first floc discharge port G is provided in the upper part of the lid body, and a second floc discharge port G is provided in the side wall of the outer station [phase] directly below and near the blocking wall T, and a second floc discharge port G is provided in the upper part of the lid body. A raw water outlet is provided halfway between the outlet and the lower end of the outer station, and the raw water outlet is provided with an opening/closing means. The plate-shaped electrode is made entirely of a material that is not consumed by the reaction, such as graphite, and as the filler αυ, it is generally suitable to use a sphere or something similar in shape. Alternatively, a hydroxide coating formed by chemical treatment is used. Specifically, aluminum balls called aluminum shot, which are used as a deoxidizing agent for iron manufacturing, may be used after being subjected to a predetermined treatment. In the same figure, the cap is a filling port for replenishing the filling material, and (7) is a supporter, which is an intermediate cylinder α.
C11) is a mounting leg that maintains a constant distance between C9 and the inner cylinder αh and connects them to each other.

In the above electrolytic treatment equipment (1), an oil-containing wastewater tank (
The nine wastewater is sent from the inlet +141 (indicated by ■ in Figure 1) to the electrolytic treatment 311! in the electrolytic cell α1! is decomposed and collected by activated aluminum hydroxide generated from filler G61 to form an insoluble floc,
Furthermore, it adsorbs and floats the gunk generated in the vicinity of the t-pole αe, and is separated into treated water and flocs by the flotation separation tank a2. The treated water becomes a steady flow as it flows through the outer flow path 3D of the inner flow path, and is discharged from the raw water outlet while separating the flocs remaining in the treated water at the outer flow path opening. On the other hand, the flocs floated and separated in the storage chamber @ and the closed part of the outer flow path an can be removed by closing the opening/closing means at an appropriate timing to remove the flocs from the first and second floc discharge ports □□□・■
more excreted.

The raw water discharged through the raw water outlet passes through a flotation separator (2) according to the present invention, which will be described in detail later, and is stored in a storage tank (5) as final treated water from which flocs have been almost completely removed, and is sent to the outside as appropriate. − is discharged to. In addition, 8@ in Figure 1 is the storage tank (5
), which drives the discharge pump at appropriate timing to discharge the final treated water to the outside.

On the other hand, the floc containing some treated water discharged from the electrolytic treatment device (11) and flotation separation device (21) is sent to the auxiliary separation tank (3). , an inner cylinder (■) is provided with a constant gap between the can-shaped outer station (to) and the nuclear outer station (to), and the inlet of the outer cylinder (g).
2) A sealing wall (411 is provided below between the outer cylinder-inner wall and the inner cylinder (G) outer wall, and a discharge port (421 is provided below the sealing wall (411) on the outer cylinder-side wall; In addition, a floc collection body with an opening at the top is installed inside the rigid body 0a.The flocs containing the treated water are sent from the inlet (to), go over the top end of the cylinder, and enter the inner cylinder (t). , only the flocs flow into the upper opening of the floc collector 143 and are sent to the external waste oil tank ■.On the other hand, the treated water from which the flocs have been roughly removed is discharged from the outlet 142+ and is used for oil-containing wastewater treatment. Returned to tank ■.

Next, an embodiment of the flotation and separation apparatus according to the present invention will be described in detail based on FIGS. 3 to 7.

Fig. 3 is a front view of the flotation separation device (2), Fig. 4 is a side view of the flotation separation device (21), and Fig. 5 is an A-A in Fig. 5.
A sectional view taken along line B-B in FIG. 5, and FIG. 7 a cross-sectional view taken along line C-C in MS5.

The flotation separation device (2) has a rectangular tank body 1 with an open top.
11t - @1 flow I9 f+2, 2nd flow II, 1st static flow tank 4), 2nd still flow M, 4) formed by subdividing into three partition walls vertically installed It consists of a treatment oval and a fish body () with an air vent ση provided at the upper opening of the tank body part υ, and is appropriately placed on a mount (c).

Tank body (tank body), lid body (cover and partition wall are made of synthetic resin, FRP,
Any material can be selected, such as corrosion-resistant steel plate or regular steel plate.The side wall of the tank body (5I!) has an inspection window opening for observing various internal parts, and the bottom plate of the tank body is formed by tilting to one side. At the lower part of the side wall of the tank body +511 on the sloping lower side of the bottom plate, discharge ports are provided corresponding to various types.

The first flow 4i where raw water first flows in! f521 has an inlet port a at the bottom of the tank, an electrolytic direction Ill that communicates with the inlet cJI601, and a floc collection floating body (62).
is connected to a floc discharge pipe (63) provided on the side wall of the tank.

The electrolytic cylinder 111 and the inlet port communicate with each other through an introduction chamber (64) which is open at the top, and an electrolytic cylinder @phantom is installed at the top of the introduction chamber (641).The electrolytic direction υ At the bottom, a plurality of plate-shaped electrodes (having cathodes and anodes arranged alternately) are arranged in parallel at an angle to the vertical direction, and a power supply means (not shown) is installed.
The electrodes are connected to each other. As the material of the electrodes, a material that is not consumed by electrolytic treatment, such as graphite, is used.

The floc collection floating body I21 has a funnel-shaped cross section, and an air chamber is provided in the conical peripheral wall.

The upper opening 671 of the floc collection floating body ridge is a floc discharge pipe (63 ) via a flexible tube m).

The above-mentioned first fluidized tank 152+ and the second fluidized tank sister arranged adjacent to each other are separated by the tank body (@1 bulkhead V0 erected at 511), and the second fluidized tank has a wall inside. , said first fluidized tank @
Electrolytic cylinder 111, floc collection floating body, floc discharge pipe (63!, introduction chamber @ pull,
An electrode (611, ff1IK distribution port (7+) is opened under the first bulkhead.

The first static flow tank l54) is connected to the front 6 second fluid tank link and the second partition wall (
The second partition wall σZK communicates with both tanks, and has a vertically long first slit (2) whose upper end is located below the upper part of the electrolysis tank between the second fluidized tank. I'm Sago T.

In addition, @2 static flow (5 of 1) is arranged adjacent to each other via the second fluidized tank (2) and the second partition wall proboscis, and via the first static flow tank β4) and the fifth partition wall ff41. The third partition wall ff41 has a side wall side superior to the tank body, and has an upper end fi-me said first
A vertically long second slit (A) with approximately the same height as the slit 3) is provided on the side wall of the tank body (51), and the treated water is connected to the bottom of the second static flow ellipse (55+). A discharge port H is provided.

The first and second static flow tanks β4) and acid have the same configurations as those described above, and a floc collection floating body is connected to the floc discharge pipe (
63) via a flexible tube 19), and these floc collection floating bodies 162+ are connected to the 16th
Adjust the height using the sinterable tube so that it is approximately the same height as that in the second fluidized tank and acid. In addition, various water levels, that is, the upper opening level (V) of the floc collection floating body, can be determined by raising the flow path to a desired level in the flow path after the treated water outlet (3). .

In the present invention, the number of fluidized flow tanks and static flow tanks is not limited to the above configuration and can be freely selected.

The flotation and separation apparatus of the present invention has the above-mentioned structure, and the operation of each part of the apparatus will be explained next.

The raw water containing flocs with low buoyancy that has flowed in from the inlet 16G provided at the bottom of the first fluidized tank is introduced into the introduction chamber I4.
1, flows to the electrolytic cylinder II+, and is subjected to electrolytic treatment while flowing upward between multiple electrodes installed at the bottom of the electrolytic station. In other words, undecomposed pollutants are decomposed. The flocs still remaining in the raw water are adsorbed by the gas generated by the electrolytic reaction and are separated by flotation as they adsorb each other and float on the water surface.During electrolytic treatment,
Since the electrode (651) is mounted obliquely with respect to the vertical direction, effective electrolytic treatment can be performed.

The flocs accumulated on the water surface open above the water surface and flow into the upper opening of the nine floc collection floating body, into the flexible tube.
It passes through the floc discharge pipe and is discharged to the outside. At this time, the floc collection floating structure consists of the floc discharge pipe 1 and the flexible pipe 1i.
1, so even if the entire device swings, the upper opening (6η) of the floc collection floating body located on the water surface in the tank can continue to float along the water surface. There is no reduction in the collection effect.This is very inconvenient when this device is installed on a ship.

On the other hand, the treated water that has undergone electrolytic treatment is stored in the first fluidization tank (521
After exiting the electrolytic cylinder (60), it descends and flows into the flow port (71) that communicates with the second fluidized tank (transfer).The treated water sent to the second fluidized tank is redirected. Due to the above action, the first
After completing the preliminary treatment in the second fluidized tank, it is sent to the static flow tank.

The movement of the pre-treated water after the treatment by the second flow ellipse 3) is as follows:
Vertically long first slit (2) opened in the second bulkhead C
Since the liquid moves through the air, there is no upstream or downstream movement, and there is no agitation. Therefore, even small flocs with weak buoyancy that were flown upstream and downstream and could not be floated and separated floated in the wc1 static current seed section. The floc after surfacing is the first
The flocs are collected by the floc collection floating body 12) in the static flow tank (54) and discharged to the outside via the flexible pipe (09) and the floc discharge pipe (63).

The treated water separated by flotation in the first static flow tank (c) 4) is
The treated water is again transferred to the second static flow tank having the same structure through the second Nuritsu 4, and the minute flocs still remaining in the treated water are floated and separated, and the flocs are almost completely removed. The treated water that has been subjected to the subsequent treatment in the second static flow tank f54+-iθ is discharged to the outside through the treated water outlet ff61vi-.

As explained above, in the flotation separator of the present invention, raw water is poured into a fluidization tank as a preliminary treatment, and the electrolytic treatment is performed in an electrolytic cylinder while flowing upward, so that the flocs remaining in the raw water undergo an electrolytic reaction. It adsorbs the gas generated by p, gives it buoyancy, and is assisted by the upward flow.
The residual flocs are effectively float-E separated. In addition, the treated water that has been processed in the first stage is further processed in the second stage by being sent to a static flow tank with no upstream or downstream flow, and moves under a quiet flow. Even weak flocs can be effectively floated and separated. As described above, the flotation separator of the present invention can almost completely separate and remove flocs remaining in raw water, and has great utility as an auxiliary device for oil-containing wastewater treatment.

[Brief explanation of the drawing]

@ Figure 1 is an overall explanatory diagram of the oil-containing wastewater treatment system, Figure 2 is a vertical cross-sectional view of the electrolytic treatment equipment, Figures 3 to 7 relate to the flotation separation equipment according to the present invention, and Figure 3 is a front view of the equipment. 4 is a side view of the device, FIG. 5 is a view taken along line A-A in FIG. 5, FIG. 6 is a sectional view taken along line BB in FIG. 5, and FIG. - A cross-sectional view taken along line C is shown. (1)...Electrolytic treatment device, (2)...Flotation separation device, (3)...Auxiliary separation count, town)...tank body, 15
Death: 1st fluidized tank, 2nd flow I17I, IFi
4)...First static flow tank, (6θ...Second static flow tank, @Q
...Inlet, analysis...electrolytic tube, clear...floc collection floating body, -...floc discharge pipe, (6I51...electrode, βη...upper opening, H...f section opening , ffl+・
... Distribution port, 3)... 1st slit, 4... 2nd
Slit, (3)... Treated water outlet. Patent applicant: Mitsukawa Kogyo Co., Ltd. Taiyo Kenzai Co., Ltd. Agent: Attorney Yasu 1) Satoshi Yumei 6 i'4 Figure 7 6

Claims (1)

[Scope of Claims] 1. A flotation separation device for flotation separation of unseparated flocs remaining in raw water after electrolytic treatment of oil-containing wastewater, the fluidization tank for flotation separation by providing flotation blades to the flocs. And a static flow tank for floating and separating the flocs remaining in the pre-processed water in the fluidized tank as a post-processing process? Each fluidized tank has at least one tank, and the fluidized tank is provided with an inlet for raw water at the bottom of the tank, an electrolytic direction communicating with the inlet is erected in the tank, and at least one pair of electrodes is installed at the bottom of the electrolytic station. It has a floc collection floating body for a fluidized tank which is equipped with a floc and floats with the upper opening facing upward, the lower opening of the floating body is connected to a floc discharge pipe for the fluidized tank provided on the inner wall of the tank, and a , a slit is opened for sending the pre-treated water to a static flow tank, and the static flow tank is provided adjacent to the fluid tank and communicates with the 1rLI period slit, so that when the fluidized volume floc collection float floats, , has a floating body for collecting flocs in a static flow tank, which is located at approximately the same flatness as the floating body and is intended to float with its upper opening facing upward; A floc flotation separation device connected to a pipe and having a treated water outlet at the bottom of the tank.