JPS61257297A - Filthy water treating apparatus - Google Patents

Abstract

PURPOSE:To improve the efficiency for removing org. matters and to reduced the amt. of necessary oxygen at the same time by installing aerobically treating means for anaerobically treated water in plural stages in series and treating the anaerobically treated filthy water aerobically. CONSTITUTION:In a filthy water treating apparatus constituted of an anaerobically treating means 10 for treating the filthy water anaerobically, and an aerobically treating means 11, 12 for treating the water from the anaerobically treating means 10 aerobically, said aerobically treating means 11, 12 are installed in plural stages and in series. By this treatment, reducible S is almost completely removed in the upstream side aerobically treating means. Therefore, the treatment in the downstream aerobically treating means is directed so as to remove mainly org. matters. Thus, the efficiency for the removal of org. matters is improved and, at the same time, the necessary O2 amt. can be reduced. Further, clogging of pipe line due to deposition of S is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sewage treatment apparatus, and particularly to a sewage treatment apparatus equipped with an anaerobic treatment means and an aerobic treatment means.

[Prior art] Anaerobic treatment uses anaerobic microorganisms (which do not require I element) to decompose organic matter. This anaerobic treatment is suitable for treating waste liquid with concentrated organic matter, and it is several thousand ~
It is used to treat wastewater or sludge containing tens of thousands of ppm.

This anaerobic treatment liquid is also called a desorption liquid,
Because it does not contain dissolved oxygen and contains some BOD components, it cannot be discharged as is.
To deal with this, an aerobic treatment means is installed downstream of the anaerobic treatment means, and the anaerobic treatment liquid is further aerobically treated to remove BOD components and dissolve oxygen. The device is known.

[Problems to be solved by the invention] By the way, when wastewater contains S components such as sulfate ions, the S components in the wastewater can be converted to reducing S by anaerobic treatment.
and is discharged from the anaerobic treatment means together with the treated water.

When exposed to an aerobic atmosphere from an anaerobic atmosphere, the reducing 8% contained in this anaerobically treated water is precipitated as simple S. However, if sufficient oxygen is provided, simple S is biologically oxidized to 5Ofi-.

Therefore, in a wastewater treatment apparatus equipped with an anaerobic treatment means and an aerobic treatment means, there is a problem that S is precipitated in the piping of the anaerobically treated water, causing the piping to become clogged. In addition, reducing S
When S flows into the subsequent aerobic treatment tank, the oxidation of reducing S occurs before the oxidation of organic matter, resulting in a low organic matter removal rate and deterioration of treatment efficiency. Moreover, due to the presence of reducing S that has flowed in, the inside of the tank is 82-
There was also the problem that the bacteria that melts S2- to 80% leached out, making the aerobic treatment tank cloudy, and that the quality of the treated water deteriorated when S2- flowed in compared to the case where only residual organic matter was oxidized. Furthermore, it was necessary to supply a large amount of air to the aeration tank in order to oxidize the incoming reducing 8 minutes to 501-, which was disadvantageous in terms of both power and equipment.

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, the sewage treatment device of the present invention includes an anaerobic treatment means for treating sewage anaerobically, and treated water from the anaerobic treatment means. This is a sewage treatment apparatus equipped with an aerobic treatment means for aerobically treating waste water, in which a plurality of stages of the aerobic treatment means are installed in series.

[Function] In the present invention, since multiple stages of aerobic treatment means for aerobically treating anaerobically treated water are installed in series, the upstream aerobic treatment means almost completely removes the reducing 8 minutes. Can be removed. Therefore, in the subsequent aerobic treatment means, it is possible to perform a process that mainly involves the removal of organic matter, improving the organic matter removal efficiency and reducing the amount of oxygen required. In addition, clogging of piping due to S precipitation is also prevented.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

1 and 2 are diagrams showing one embodiment of the sewage treatment apparatus of the present invention, FIG. 1 is an overall configuration diagram, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1. .

The sewage treatment apparatus of this embodiment includes an anaerobic treatment tank 10, a first tank 11 constituting the first stage aerobic treatment means. A second tank 12 constituting a second-stage aerobic treatment means is provided.

The stock solution is first introduced into the anaerobic treatment tank 10 and subjected to anaerobic treatment, and the treated water is sent to the first tank 11 from the piping 10a. (In addition, the gas generated by anaerobic treatment is
0b, it is discharged to the outside of the tank. ) The first tank ti has a rotating disk 11a, and sulfur-oxidizing bacteria such as Beggiatoa adhere and proliferate on the surface of the rotating disk 11a to form a biofilm. Aerobic treatment is performed by contacting this biofilm with the inflowing anaerobic treated water. Note that the oxygen necessary for the aerobic reaction is supplied by exposing the biological film to the atmosphere when the disk 11a rotates and emerges above the water surface.

In the first tank 11, the reducing S contained in the anaerobically treated water is biologically aerobically treated by sulfur-oxidizing bacteria such as Begiat 7 on the surface of the disk 11a, and is mainly treated as S alone or as 5ol-. oxidized to sulfur oxide ions. Note that whether reducing S is oxidized to 5O1-, etc. or to S alone is determined by the amount of oxygen supplied.

SOmie and the like produced by oxidation are dissolved in water. Moreover, most of the single S is deposited as a precipitate on the rotating disk 11a, and is scraped off by the scraping device flb.

In this way, in the first tank 11, reducing S in the anaerobic treatment liquid is removed as simple S or as 5O
It becomes dissolved in the liquid as 1- etc.

In this embodiment, the tip of the pipe 10a of the anaerobic treatment liquid from the anaerobic treatment tank 10 is located in the liquid in the first tank 11, so that the anaerobic treatment liquid does not come into contact with air during this feeding process. Therefore, the reducing S contained in the anaerobic treatment liquid is not oxidized and precipitated during this feeding, and the piping system is prevented from being blocked by this.

In the first tank 11, the liquid that has undergone the first stage aerobic treatment is then introduced through a pipe lie into the first tank 12-, which constitutes the aerobic treatment means on the rear stage side. Second tank 12
has an aeration pipe 12a at its bottom, and a pipe 12b
The air supplied from the tank becomes fine bubbles and flows into the second tank 12.
As a result, the organic substances are aerobically decomposed in the second tank 12.

Since the reducible 8% is removed in advance in the first tank 11, the amount of air supplied to the second tank 12 is sufficient to decompose the organic matter. Therefore, the amount of supplied air is reduced, which is advantageous in terms of power and equipment.

(For example, a small-capacity air supply blower is sufficient.) The liquid that has undergone aerobic treatment in the second tank 12 is taken out of the line through the pipe 12c and sent to a discharge system or another treatment system.

3rd rI! In this embodiment, a gas-liquid contact tower 13 is installed above the first tank 11 as a biological fixation means for the first tank 11 of the aerobic treatment means. The gas-liquid contact tower 13 is filled with a contact material 14. Sulfur-oxidizing bacteria are supported on the surface of this contact material 14 to perform oxidation treatment of reducing S in the anaerobically treated water. , are connected to the anaerobic treatment tank 10 via piping 10a. Furthermore, air is naturally introduced into the gas-liquid contact tower 13 from the bottom thereof. Of course, air may be forcibly introduced using a fan.

In this apparatus shown in FIG.
The sulfur, sulfur-producing organisms, and air sprayed from the contact material 14 oxidize the contained reducing components. S, which is precipitated as a single substance by oxidation, adheres to the surface of the contact material 14. Further, 5Ofi- and the like flow down into the first tank 11 while being dissolved in the liquid.

In this way, the treated liquid from which reducing S has been removed in the first tank 11 is sent to the second tank 12 through the pipe 11c, where it is subjected to aerobic treatment in the same manner as in the apparatus shown in FIG. Water is taken out from pipe 12c.

In the above embodiment, the aerobic treatment in the second tank may be performed using a rotating disk or other known aerobic treatment means filled with a single organism.

Furthermore, in the above embodiment, each stage of aerobic treatment means is provided with a tank, and the cypress of each stage is separated from each other, but one aerobic treatment tank is provided with an appropriate partition plate, It may be divided into two or more processing chambers.

An experimental example will be explained below.

Experimental Example 1.2 Sewage was treated using the sewage treatment apparatus shown in FIG. 1 (Experimental Example 1) and FIG. 3 (Experimental Example 2).

The properties of the stock solution, supply amount, various 10 to 12 volumes, air supply amount, etc. are as follows.

LI T O055m g/l 52- Om g/1SO
i-35mg/fL Supply amount 0.02jl/m1n1 1 Anaerobic treatment tank 5M 1st tank 1.2JL 2nd tank 1.2m Aeration amount to the 2nd tank 0.02JL/min 1 dish Top 1 Capacity 2 Gas-liquid contact material Type String-like filler Length of filler 4 m Bacterial species Beggia toa Treated water from the anaerobic treatment tank and treated water from the first tank of the aerobic treatment means obtained in each case Table 1 shows the quality of the treated water in the second tank.

From Table 1, Table 1g1 shows that according to the apparatus of the present invention, in the first paddle of the aerobic treatment means, S in the anaerobically treated water has a high removal rate (
For the device shown in Figure 1 = 27% (= (35,0-25,
5)/35.0), for the device shown in Figure 2 = 38% (=
(35,0-21,8)735.0) ), and it is clear that all the contained 8's were oxidized to the 501- form. In the second tank of the aerobic treatment means, there was no precipitation of S at all, organic matter was efficiently removed, and extremely good treated water was obtained.

[Effects] As detailed above, the sewage treatment apparatus of the present invention includes an anaerobic treatment tank, and aerobic treatment means installed in series in multiple stages for aerobically treating the treated water of the anaerobic treatment tank. In the first stage of the aerobic treatment means, the reducing components in the anaerobic treatment water are almost completely removed or oxidized to soluble substances. Therefore, (1) precipitation of S in the subsequent aerobic treatment means, resulting in clogging of pipes, etc., and clouding of the treated water do not occur;

■ The amount of oxygen required in the downstream aerobic treatment means is significantly reduced. Therefore, the overall oxygen supply is also reduced.

(2) In the aerobic treatment means on the downstream side, priority is given to biota that is effective in removing organic matter, making it possible to remove organic matter extremely efficiently.

Effects such as these are produced.

Therefore, according to the sewage treatment apparatus of the present invention, even if the sewage contains sulfate ions or the like, it is possible to obtain treated water of good quality, which has a very low 58 min content and an extremely low organic matter content.

[Brief explanation of drawings]

FIG. 1 is a structural diagram showing one embodiment of the sewage treatment apparatus of the present invention, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. FIG. 3 is a structural diagram showing another embodiment of the uninvented sewage treatment apparatus. 10... Anaerobic treatment tank, 11... First cypress of aerobic treatment means, 12...
...Second paddle of aerobic treatment means, 11a...
・Rotating disk, 13... Gas-liquid contact tower.

Claims (2)

[Claims] (1) A wastewater treatment device comprising an anaerobic treatment means for treating wastewater anaerobically and an aerobic treatment means for aerobically treating treated water from the anaerobic treatment means, the aerobic treatment means is a sewage treatment device characterized by having multiple stages installed in series. (2) The sewage treatment apparatus according to claim 1, wherein the most upstream aerobic treatment means has biological fixation means.