JPS58114793A - Method and device for purification of sewage - Google Patents

Abstract

PURPOSE:To shorten a treating time considerably by adsorbing and oxidizing soluble org. materials among org. materials contained in raw water by means of contact oxidizing material layers or contact oxidizing basins for a specific time and filtering solid org. materials and solid inorg. materials by means of filter medium layers. CONSTITUTION:Supernatant water in a settling basin 1 is introduced through an inflow regulating valve V1 into a contact oxidizing part 2a, where the water is brought into contact with contact oxidizing material layers 3. When air is supplied thereto from an air diffuser 5 in the lower part and the water is allowed to stagnate for 0.3-3 hours, the soluble org. materials in the supernatant water is quickly oxidized by contact. On the other hand, solid org. materials and inorg. solids are filtered by filter medium layers 4 in a filter part 2b after passing through the layers 3. The filtrate thereof and the treated water of said supernatant water are fed from a water collecting tank 2d through a connecting valve V4 and a control tank 9 to a sterilizing tank 12, where the water is treated and is then released.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a sewage purification method and apparatus for biologically treating sewage such as urban sewage and industrial wastewater containing soluble organic substances and solid organic substances with high physical efficiency. It is related to.

In general, to treat wastewater such as urban sewage and industrial wastewater,
A method is being used in which the soluble organic matter and solid organic matter constituting the wastewater are completely oxidized by a biological treatment method mainly using an activated sludge method. The organic matter contained in the supernatant water of the primary settling tank in urban sewage can be divided into solid and soluble organic matter, and the solidity is approximately divided by the solubility, which is approximately 10. The oxidation reaction rate for solid organic matter is measured in days, while for soluble organic matter there is a large difference in time ATo. However, in conventional biological treatment methods such as activated sludge method and contact oxidation method, solid organic matter and dissolved organic matter have extremely different reaction rates. This method is disadvantageous because it is low in efficiency and requires processing.

The present invention has been made to solve the conventional problems in view of the above circumstances, and includes the following two inventions.

LSL's invention is a biological oxidation treatment for wastewater purification.
Among the organic substances contained in raw water, soluble organic substances with a high oxidation reaction rate are adsorbed and oxidized for 0.3 to 3 hours in a multi-stage contact oxidizer layer or contact oxidation pond. The present invention has the following advantages regarding a wastewater purification method characterized in that P is separated from wI type inorganic matter in solid organic matter with a slow PjI material layer.

According to this invention, conventional catalytic oxidation is performed only on soluble organic substances with a high reaction rate (approximately 10% of the total organic substance content),
Solid organic matter having a slow reaction rate (approximately + of the total organic matter content) can be physically separated in its 11 state or in a slightly adsorbed state, so it is advantageous for wastewater containing a large amount of solid organic matter, such as municipal sewage. In other words, soluble organic matter is treated by biochemical means such as catalytic oxidation, and solid organic matter is separated by salt-based means by filling a temporary material such as hard, lightweight aggregate, anthracite, etc. Therefore, the time unit (0,
The treatment time is significantly shortened by the oxidation treatment (3 to 3 hours).

For example, in a contact oxidation tank filled with contact oxidation material,
The capacity of the catalytic oxidation tank is now +li[ compared to the conventional one, and catalytic oxidation can be carried out sufficiently with the amount of air used being +tt compared to the conventional one. Then, the microbial film and the like peeled off from the contact oxidizing material are physically separated by the waste material layer along with solid organic matter and inorganic matter.

The sludge separated in the sieve material layer causes the pores in the sieve material, so it is discharged to the outside of the treatment tank along with the backwash wastewater. but,
The properties of this discharged sludge are different from conventional surplus sludge, and have properties similar to dead sludge that was initially discharged from the settling tank.
Even if it is difficult to shrink or dewater like excess sludge, it is possible to perform shrinkage and dewatering to a large capacity. Therefore, with the conventional worries, 6
There is no need to process and dispose of surplus sludge, which simplifies normal operation, and even when sludge is processed, the amount of methane gas generated during digestion increases because it contains a large amount of solid organic matter. Even if an incineration facility is provided, the calorific value of the dehydrated cake is high, so heating of the digestion tank and fuel for the incineration facility can be saved.

To summarize the above, this wastewater purification method does not biooxidize all of the soluble and solid organic matter in raw water, but only the soluble organic matter that has a high oxidation reaction rate. By shortening the oxidation treatment time to approximately 10 minutes, and capturing and separating solid organic matter in the temporary material layer, it is possible to obtain a salt treatment effect equal to or higher than that of the conventional biological treatment method, save energy, and reduce the area of the treatment plant. It has many advantages, such as reduced size and ease of maintenance.

The second invention is to provide a sewage purification device suitable for carrying out the first invention, in which the catalytic oxidation part and the transient part are formed into an upper and lower integral structure, and the interval between these parts is θ~2001M+
The present invention relates to a sewage purification device characterized in that it is set to:

The present invention will be explained below with reference to illustrated embodiments.

As shown in Fig. 1, supernatant water (hereinafter referred to as raw water) is supplied from the settling tank 1 to the upper part of the treatment tank 2 through the raw water inflow regulating valve 2 and the full-view supply pipe 4, so that it can be treated in the treatment tank 2. The upper part is the contact oxidation part 21. The lower part is the F-recessed part 2b, and the contact oxidation part 2& is provided with a contact oxidizing material layer 3, and the -recessed part 2bK is provided with a transient material layer 4, respectively. An aeration device 5 is provided for the contact oxidizing material layer 3 within the interval 20 between the contact oxidizing section 2a and the transient s2b, and an aeration device 6 is provided within the transient material layer 4 in the retracting section 2b. of,
A # □ outlet 278 is provided below the air diffuser f5 within the above-mentioned interval 2o so that air is supplied from the air supply device 7 through the air supply valves V, , V, respectively. - The ninth water tank 2d formed under the retracted part 2b is connected to the adjustment part io in the adjustment tank 9 via the connection valve V,
The liquid in the adjustment slO crosses the top of the weir 11 v111--
Led.

A water level detector 13 is installed in the upper part of the treatment tank 2, and the bottom of the sedimentation tank 1 is initially connected to the sludge thickening s14 through the valve v1, and the discharge trough 8 is connected to the valve V- and the drain valve 7 on one side. to the sludge 1lIiiiIa section 14 through the drain valve v
s to the sand settling basin 16, respectively.

In the Gensuisha contact oxidation section 21L, which is supplied to the upper part of the treatment tank 2 via the raw water inflow regulating valve v1, it comes into contact with the contact oxidizer layer 3 and receives air continuously from the aeration device 5 below. of soluble organic matter is rapidly catalytically oxidized. The one-sided organic matter passes through the contact oxidizing material layer 3 and is separated by pF by the transient material layer 4 in the transient s2b. In order to prevent unnecessary filtration due to the sludge accumulated on the surface of the filter material layer 40, air is supplied from the aeration device 6 below to remove the accumulated sludge and continue the filtration. - The purified water that has passed through the filter material layer 4 flows from the water collection tank 2d into the adjustment section 10 of the adjustment tank 9 via the connecting valve V, crosses the weir 11, and is sterilized in the sterilization section 12 before being discharged.

During such purification work, accumulated sludge causes temporary loss of water Ii.
When I increases and the water level reaches the upper limit, this is detected by the water level detector 13 and the raw water inflow valve v1゜air supply valve v
3. The connecting valve v4 is closed, the drain valve V is opened, and the raw water in the catalytic oxidation sza above the discharge trough 8 returns from the drain trough 78 to the settling basin 15. Then, when the water level falls at the discharge tray 781, this is detected by the water level detector 13, and the drain valve V is closed, and the drain valve V7. The connection valve V opens, and purified water flows back from the adjustment section 10 due to the water level difference between the treatment tank 2 and the adjustment section 10, backwashing the temporary material layer 4, and at the same time, the air supply valve V1 opens and the air diffuser 6 Air is ejected to effectively wash the temporary material layer 4, and the washed wastewater flows from the discharge port 278 to the sludge thickening section 14 via the drain valve V.

- After the backwashing of the overfill layer 4 is completed, the drain valve Vma is closed, the air supply valve V1 is switched to periodic opening and closing, and the raw water inflow regulating valve V is opened, raw water flows in, and the water level reaches the normal water level. This is detected by the water level detector 13, and the air supply valve V is opened to return to normal operation.

Next, referring to FIG. 2, this figure is a schematic diagram of an embodiment in which pure oxygen is used instead of air, and the treatment tank 2 and adjustment tank 9 are almost the same as those in FIG. configured,
Oxygen is supplied from the pure oxygen tank 16 via the valve 17 to the diffuser 18 in the transit section 2b, and then the oxygen that has risen is supplied to the air diffuser 18 located in the upper part of the gap 20 between the transit section 2b and the catalytic oxidation section 2a. The oxygen that passes through between the center opening 20 of the oxygen reservoir 19 and the discharge trough 8 located at the center and rises and accumulates in the oxygen reservoir s19 passes through the valve 21 and is returned to the pure oxygen tank 16 by the blower 22. . The pure oxygen tank 16 is supplied with pure oxygen from the supply pipe 23. In this way, the efficiency of multi-catalytic oxidation is increased by using pure oxygen, and excess oxygen is recovered to reduce costs.

Furthermore, an air supply pipe 24 is provided at the diffuser 18 installed in the filtration material layer 4 so as to clean the boundary portion of the filtration material;
A surface layer cleaning device 25 is provided on the overfill layer 4.
1 The above-mentioned sewage purification apparatus can be configured as follows in both embodiments.

■ The catalytic oxidizing material layer in the catalytic oxidation section can be moved up and down manually or automatically as the water level of raw water changes.

■ The supply position of oxygen necessary for catalytic oxidation is determined from the catalytic oxidation part.
Appropriately select whether to place it between the V-recessed part, inside the retracted part □ in the filter material layer, at the bottom of the filtration part, or at one or more of these places. However, air or pure oxygen is used as the supplied oxygen.

(2) A rotating disk device can be used in place of the catalytic oxidizing material layer in the catalytic oxidation section, and a mechanical aeration device can be provided in place of the aeration device.

Incidentally, it is preferable to use a plurality of processing tanks 2 and adjustment tanks 9 in parallel.

According to the above-mentioned sewage purification system, biochemical oxidation treatment of soluble organic matter in raw water is completed in a short time in the catalytic oxidation section.
The solid organic matter is then captured by the filtration material layer in the lower 13 filtration section, and is separated from the filter material by backwashing and disposed of. It is advantageous in that it requires less time and cost than oxidation.The advantages are as follows.

■ Since the catalytic oxidation section and the transient section are placed one above the other, the site area of the treatment plant is significantly reduced. In other words, if the catalytic oxidation section and the transient oxidation section are placed side by side, a large site area will be required, but if they are placed one above the other, they will fit within the water depth of the existing aerage tank, and the site area will be approximately the same as that of the conventional aerage oxidation tank and final sedimentation tank. It will be about ten.

■ There is no need to transport return sludge or surplus sludge, and there is no need for troublesome biological operation management like in conventional airage tanks.

■ It does not require a large amount of air as in the past, and only requires about 10 degrees of air, so the equipment capacity is small, and the supply pressure is 0.5Kf/c11.
The amount below is sufficient, resulting in significant energy savings.

■ Even in the sludge treatment process, there is no need to worry about processing and disposing of excess sludge, and operation management is easy.

■ Fuel required for heating the digestion tank and incineration equipment is saved.

To summarize the above, this device reduces the site area.

This is extremely advantageous, such as facilitating maintenance and management in sewage/water treatment and sludge treatment.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the sewage purification apparatus of the present invention, and FIG. 2 is an explanatory diagram showing the main parts of the sewage purification apparatus of the present invention using pure oxygen. 1 is the initial settling tank, 2 is the treatment tank, 2 & is the catalytic oxidation section, 2b
is the transit part, 2C is the interval, 2d is the water collection needle, 3 is the contact oxidizing material layer, 4 is the transit material layer, 5.6 is the air diffuser, 7 is the air supply device, 8 is the discharge trough, 9 is the Adjustment tank, 10 is adjustment section, 11
is a weir, 12 is a sterilization section, 13 is a water level detector, and 14 is a sludge a.
15 is a settling basin, 16 is a pure acid accumulation pipe, 18 is a diffuser, 19 is an oxygen reservoir, 20 is an opening, and 21 is a valve for oxygen recovery: E

Claims (1)

[Claims] L In biological oxidation treatment for wastewater purification, soluble organic matter with a high oxidation reaction rate among the organic matter contained in raw water is removed by a single or multi-stage catalytic oxidizing material layer or catalytic oxidizing section. 0.
A method for purifying wastewater, which comprises adsorbing and oxidizing for 3 to 3 hours, and then separating solid organic matter and solid inorganic matter, which have uniform oxidation reaction rates, using a filter layer. 2. A sewage purification device characterized in that the catalytic oxidation part and the transient part have an upper and lower integral structure, and the interval between these parts is set to 0 to 200 cm. λ The sewage purification device according to claim 2, wherein pure oxygen is supplied to the device instead of air, and surplus oxygen is recovered and accumulated. Table: Oxygen necessary for catalytic oxidation in the above device is added to the gap between the catalytic oxidation part and Fffl@, in the temporary material' layer in the retreat part,
The sewage purification device according to claim 2 or 3, wherein air or pure oxygen is supplied to the lower part of the filtration part, or to a single part or a combination of these parts. & The sewage purification device according to claim 2 or 3, wherein the position of the catalytic oxidizing material layer of the catalytic oxidizing section can be moved up and down manually or automatically as the water level of the raw water changes. & The sewage purification device according to claim 2, wherein a rotating disk device is provided in place of the catalytic oxidizing material layer of the catalytic oxidation section, and a mechanical aeration device is provided in place of the aeration device.