JPS61114796A - Anaerobic filter bed apparatus - Google Patents

Abstract

PURPOSE:To prevent the lowering in function, by dividing a tank into plural sections and arranging an air diffusion pipe, which supplies washing gas, to the lower part of the packing material bed in each tank. CONSTITUTION:Water to be treated flowed into tanks 1a, 1b, 1c, 1d is passed through packing material beds 6a, 6b, 6c, 6d to reach a solid-liquid separation tank 8 from a treated water discharge pipe 12 through an intermediate water seal tank 8 and flowed in the separate treatment apparatus in the next stage. A gas exhaust pipe 10 for separately guiding formed gas to a blower 5 is connected to the upper part of each tank and the blower 5 is branched on the way to be further connected to the gas diffusion pipes 14 from the lower parts of the tanks 1a, 1b, 1c, 1d. All of values X1-X4 and V1-V4 are closed and, if a pump 4 and the blower 5 are operated to perform the anaerobic treatment of water to be treated, water to be treated is respectively independently treated in each tank.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides (i! The present invention relates to an anaerobic filter bed device in which organic matter is removed by anaerobic treatment including methane fermentation treatment by introducing organic matter from the bottom or top of the packing material layer.

[Conventional technology]

As mentioned above, an anaerobic filter bed device removes organic matter from the water to be treated by methane fermentation using anaerobic microorganisms that are kept as epiphytes on the surface of a packing material. The filter bed tank (also referred to as an anaerobic fixed filter bed tank) is formed so as to satisfy the tank capacity determined from the relationship between the absolute amount of organic matter in the water to be treated and the load amount of the tank.

In addition, if the filler layer becomes clogged due to continued anaerobic treatment, the filler layer can be cleaned by passing a relatively large flow of anaerobic gas (inert gas, gas generated by anaerobic treatment). It is done.

[Problem that the invention seeks to solve]

In conventional anaerobic filter bed devices, the packing material layer is a single layer, so the entire layer is cleaned, but in this case, anaerobic microorganisms are more sensitive to the packing material than aerobic microorganisms. The adhesion force is weak, and because of this, the anaerobic microorganisms may be detached by washing and the amount of anaerobic microorganisms in the filler layer may be extremely reduced.In this case, the growth rate is 1715% compared to that of aerobic microorganisms. There is a problem in that it takes a considerable number of days to recover and retain ~1/20 of the anaerobic microorganisms in the filling tank to the required amount, resulting in a decrease in functionality.

Therefore, in the present invention, an anaerobic filter bed device is provided which is capable of cleaning the packing material layer at appropriate intervals while preventing an extreme decrease in the amount of microorganisms retained in the packing material layer of the anaerobic filter bed device. The purpose is to provide.

[Means for solving problems]

The gist of the present invention, which has been made to achieve the above-mentioned object, is that a tank is provided with a filler layer on the surface of which anaerobic microorganisms have grown, and water to be treated and a stirring gas are placed in the filler layer. In an anaerobic filter bed device that distributes and processes microorganisms,
The tank is divided into a plurality of cypresses that have approximately the same cross-sectional area and are sequentially cleaned at approximately constant cleaning intervals, and diffuser pipes that supply cleaning gas are arranged below each type of filler layer. It is characterized by what it has done.

Here, dividing into a plurality of tanks may mean providing independent tanks, partitioning the inside of one tank into a plurality of seed parts, etc.

[Effect]

According to the device of the present invention described above, the divided tanks can be cleaned at different times, so even if the amount of anaerobic microorganisms in one cypress tree is extremely reduced due to cleaning, Since the amount of anaerobic microorganisms in other tanks is sufficiently maintained, the decline in the functionality of the device as a whole is suppressed, and the amount of anaerobic microorganisms in the paddles described above is recovered before the next paddle cleaning time. Therefore, there is an advantage that there is no extreme deterioration in the functionality of the device as a whole.

It is desirable that the number of divided paddles be as large as possible, generally 3 to 4 or more, and the interval between each type of sequential cleaning (the water flow period for each type of water to be treated) is /
It is better to determine the number of tanks).

In addition, the present invention enables efficient cleaning by using anaerobic gas, particularly gas produced by anaerobic treatment, and furthermore, when the water to be treated is subjected to anaerobic treatment, the filler layer is stirred. If the above-mentioned anaerobic gas is always used as the stirring gas to be supplied for cleaning, and the supply gas to all the tanks is concentrated in one tank by switching the valve during cleaning, the above-mentioned anaerobic gas supply system can be improved. Another advantage is that it can be used for stirring and cleaning.

〔Example〕

Hereinafter, the present invention will be explained in more detail according to an implementation flow shown in FIG. 1 of the drawings.

The figure shows an outline of the overall configuration of the anaerobic filter bed device according to the present invention, and in the figure, la, lb, and lc are designated as la, lb, and lc.

1d is an anaerobic filter bed tank, which is divided into four tanks.

These four tanks have almost the same cross-sectional area regarding the flow of the water to be treated, and each type has a filler layer [(a, eb
, 8c, and 8d. These filler layers are
It is constructed by filling inorganic or organic fillers in the form of granules, blocks, etc., and anaerobic microorganisms are retained as epiphytes on the surfaces and gaps of the fillers as the treatment progresses. 2 is the tank 1a, lb.

This is a water inflow pipe to be treated that is branched and independently connected to each of lc and Id, and allows the water to be treated to equally flow into each tank from the adjustment tank 3 via the pump 4. In addition, X 1 , X2 , X
3, Xa are respectively connected to the branch paths of the water inflow pipe to be treated.
These are individually provided inflow switching valves, and normally all of them are open.

The water to be treated that has flowed into each type 1a, Ib, lc, and ld passes through the filler layers 8a, 6b, 8c, and 6d to the upper part, and is separated from the treated water through the water seal tank 7 from the treated water discharge pipe 12. The solid-liquid separated liquid reaches the tank 8 and is discharged as treated water or flows into another treatment device in the next stage.

In addition, gases generated by anaerobic treatment (methane gas, etc.)
is sent to the gas storage tank 9 via the gas discharge pipe 11.

Additionally, from the top of each tank, a gas exhaust pipe 10 is connected to the blower 5 for guiding the generated gas to the blower 5. The blower 5 is further branched midway through a gas supply pipe 13,
It is connected to a diffuser pipe 14 which is opened to the lower part of lb, lc, and ld. ■1 , ■2 , v3 , v
Reference numeral 4 designates gas blowing switching valves interposed in respective branch paths of the gas supply pipe 13, which are normally all open.

In the anaerobic filter bed device as described above, valves x1 to x4
and pump 4 with all v1 to v4 open.
When the blower 5 is operated to perform anaerobic treatment of the water to be treated, which is organic wastewater, each type of water to be treated is treated independently, and a part of the gas produced from each type is The gas is circulated again by the blower 5 as a stirring gas, and is blown in from various lower portions through the diffuser pipes 14 to stir the inside of the tank.

After the process continues in this state, the filler layer 6 of Jlla
If clogging occurs in tanks 1b and lc.

1d(7) Gas blowing switching valve V2 + Vs + Va
Close, ■! The gas is blown into the tank 1a in a concentrated manner, and the amount of gas blown into the tank 1a is four times the normal amount, resulting in excessive deposition on the filler layer 6a and clogging The generated anaerobic microorganisms can be separated and discharged. At this time, the treated water supply pump 4 is stopped and
, X2 ,
, v3.

■4 and X 1+ X 2 1 X 3 r X
a is fully opened and the treated water supply pump 4 is also operated again to return to the normal state.

The following layers can be cleaned sequentially at each cleaning period using the same operation, but in this case, each layer is independent and the cleaning period can be set separately, so the time interval between each type of cleaning can be changed. By preventing the retention of anaerobic microorganisms in the anaerobic filter bed device as a whole from extremely decreasing, a favorable continuous operating state can be ensured. To solve the problem of clogging of the packing material layer of an anaerobic filter bed device, cleaning is generally required in a cycle of several months, depending on the capacity and purchase of the water to be treated, etc., so the implementation flow shown in Figure 1 is recommended. Since each species is approximately the same size,
For example, if the water flow period (period from one wash to the next wash) for each type of water to be treated is 6 months, (6 months 74)
= lb, Ic, Id, la... from tank 1a at intervals of 1.5 power months.
. . . The above-mentioned cleaning operation may be repeated in sequence. In this case, even if there is an extreme drop in the amount of microorganisms retained in one tank, as judged from a drop in the amount of gas produced, for example, the functionality of the entire device will be reduced by up to 1% compared to the overall functionality.
74, and try to recover the amount of microorganisms retained in the tank whose function has deteriorated by the time of the next tank cleaning (recovery methods such as microorganism transplantation and intensive sludge return may be adopted as necessary). Therefore, the entire device can be operated continuously.

In addition, in the implementation flow shown in Figure 1, by dividing each type so that the total flow rate of stirring gas supplied to each type is approximately equal to the flow rate of cleaning gas supplied to one tank, cleaning As the blower, the blower that is always used for stirring the gas in each tank can be used as is, which is advantageous in terms of equipment since there is no need to separately provide a cleaning device or the like.

〔Effect of the invention〕

The aerobic filter bed device of the present invention has a plurality of anaerobic filter beds and staggers the cleaning times of these tanks, so that the adhesion of aerobic microorganisms to the filler is relatively weak. For this reason, even if the microorganisms in the cleaned tank are detached and the amount of microorganisms retained is extremely reduced, the functional decline due to this can be limited to a part of the tank as a whole, and the anaerobic The effect of enabling continuous operation of the filter bed apparatus without causing extreme functional deterioration of the entire filter bed apparatus is obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an outline of the configuration of one implementation flow of the apparatus of the present invention. 1a-1d: Anaerobic filter bed I! ! 2: Water inflow pipe to be treated 3: Adjustment tank 4 Ni pump 5 Ni blower 6a to 6d: Filler layer 7: Water seal tank
8: solid-liquid separation tank 9: gas storage tank 10,
11: Gas discharge pipe 12: Treated water discharge pipe 13: Gas blowing pipe 14: Diffusion pipe Relationship with Patent Application No. 2”34Zq4 of 1988 Applicant Name (Name > K+Shin”) Jr”lr&lt’/
4. Agent Address: 33G8 Marunouchi Shigesu Building, 2-6-2 Marunouchi, Chiyoda-ku, Tokyo Contents of Amendment The following matters in the statement of application are amended as shown in the attached document. In the seventh line from the bottom of page 1 and 2, the words "organic substances in the water to be treated" are corrected to "organic substances in the water to be treated." In the fourth line from the bottom of the second page of λ, the phrase "load amount of tank" is corrected to "volume load amount of tank." In the 9th to 8th lines from the bottom of the 4th page of λ, the phrase "independent cypress is provided" is corrected to "provide a plurality of independent cypresses." 4. In the fifth line from the bottom of page 4, the phrase "according to the apparatus of the present invention" is corrected to "according to the apparatus of the present invention." 5. In the first line from the bottom of page 8, the phrase ``The following layers are'' is corrected to ``The following layers are''. 6. In the 3rd line of page 9, the phrase ``specified by each type'' is corrected to ``specified by each type.'' 7. On page 9, lines 5 and 6, the phrase ``by preventing the decrease,'' should be corrected to ``by determining not to decrease.'' 8. In the fourth line from the bottom of page 11, the text "13: Gas blowing pipe" is corrected to "13: Gas supply pipe." 9. On the second line from the bottom of page 11, it says 1" Xi~x4: Processed inflow switching valve" r
t~x4: Inflow switching valve" is corrected.

Claims (1)

[Scope of Claims] 1. An anaerobic filter bed device, which is equipped with a packing material layer on the surface of which anaerobic microorganisms have grown in a tank, and performs microbial treatment by passing water to be treated and stirring gas through the packing material layer. In the tank,
Divided into multiple tanks with approximately equal cross-sectional areas and cleaned sequentially at approximately constant cleaning intervals, and at the bottom of the filler layer in each tank,
An anaerobic filter bed device characterized in that a diffuser pipe for supplying cleaning gas is provided in each case. 2. Claim 1, characterized in that the sequential cleaning interval of the plurality of tanks is determined by (water passage period of treated water in each tank/number of tanks)
The anaerobic filter bed device described in section. 3. Claims 1 or 3, characterized in that the tanks are divided so that the total flow rate of stirring gas supplied to each tank is approximately equal to the flow rate of cleaning gas supplied to one tank. The anaerobic filter bed device described in Section 2.