JPS6323797A - Methane sedimentation tank having methane bacteria immobilizing carrier take-out apparatus - Google Patents

Abstract

PURPOSE:To eliminate the interruption of work, by a method wherein a sedimentation tank is divided into an upper tank and a lower tank and a partition valve is provided to the piping connecting both tanks so as to be capable of taking out an immobilizing carrier from a manhole if necessary. CONSTITUTION:A sedimentation tank is divided into an upper tank 1 and a lower tank 4, and a sluice valve 7 and a bypass valve 8 are mounted to the flow distribution cylinder 2 between the upper tank 1 and a lower tank 4. When a carrier 5 is taken out during the operation of methane fermentation, the sluice valve 7 of the flow distribution cylinder 2 is closed and the bypass valve 8 is opened and, further, the sluice valve 9 of piping 6 is closed. The liquid in a methane sedimentation tank is drawn out from a manhole 10 by a return pump 11 while a liquid level meter 12 is looked and, when a liquid level is lowered below the manhole 10, the partition valve 7 is opened to take out the carrier 5. By this method, high load operation can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is applied to a sedimentation tank located next to a fermentation tank in full-scale shochu waste liquid methane fermentation.

(b) The purpose of installing methane sedimentation (3) after the conventional technology methane fermentation tank is to
3. The sludge is consolidated and settled by gravity, and is returned to the fermentation tank by the A pump 1, gradually increasing the sludge concentration in the fermentation tank.

However, in this gravity settling method, the sludge concentration in the settling tank is at most about 2 PPM, and the sludge concentration in the fermentation tank obtained by returning the sludge is only about 15.01111 PPM.

Therefore, the fA degree of organic matter that can be processed in the fermenter is:
31], 11111J The current situation is that conventional methods are completely inapplicable to genuine shochu waste liquid, which has a maximum concentration of 100,000 P and an organic matter concentration of 100,000 P.

(c) Problems that the invention attempts to solve.

In the conventional method, the sludge flow starts from the sedimentation tank when the sludge a degree exceeds 15.1 illU PPM, and at most 21
1.Question II P4 is the limit, but this is a feature of anaerobic sludge bacteria compared to activated sludge bacteria.

This is because it is extremely small and light, and is affected by even the slightest movement.

In order to prevent such sludge from entering the flow outlet, by immobilizing methane bacteria with an immobilization carrier, the concentration of sludge in the sedimentation tank will gradually increase. 1LSS et al. 40. υnu PP
It was possible to obtain more than M, and furthermore, by returning the highly concentrated sludge to the fermentation tank, it became possible to ferment the 1st Honkaku Shochu waste liquid.

However, since these carriers are filled at the bottom of a deep, narrow, and closed type settling tank, which is in contrast to a shallow, wide open activated sludge settling tank, the porosity of the carrier surface is poor. Due to its structure, it would be difficult to replace the container, inspect the bacterial cells after removing it, and observe the state of adhesion.

So, when replacing it, did you drain the liquid from the sedimentation tank? Reward,
There is no other option but to risk working in a deep tank.

The problem to be solved by the present invention lies in an apparatus that can easily take out carriers and the like without stopping the fermentation operation using the following side route.

(d) Problems and means for solving them An embodiment of this invention, which was implemented as a device for discharging methane settling tanks, will be explained based on FIG. 1 of the drawings.

According to No. 112, the settling tank is divided into an upper J'JI and a lower tank 4, and the rectifying tube 2 passing through the center of the settling tank connected to the inflow pipe 3 from the meta/tank is connected to It is lower and extends offshore almost to the center of the tank.

There is a sufficient distance between the upper part +11 and the lower tank 4, which is 1 = 5 r, including gate valves, etc., and a gate valve 7 and a bypass valve 8 are housed in the rectifying cylinder 2.

Furthermore, a pipe 6 connecting the upper and lower tanks of the upper tank and the lower tank is connected to the rectifier tube 2.
A gate valve 9 is attached to each of the pipes.

(E) Function When removing carrier 5 during methane fermentation operation, first,
Close the gate valve 7 of the rectifier tube 2, connect it to the bypass valve 8,
Furthermore, the gate valve 9 of the pipe 6 is closed.

Then, while watching the liquid level gauge 12, draw out the liquid in the methane sedimentation tank with the return pump 11 so that the liquid in the tank does not spill from manhole III. When the liquid level is higher than manhole lli, open the tank and remove the carrier 5. Take out.

The upper tank L and the lower Jf4 are shut off by gate valves 7 and 9, and the bypass valve 8 on the flow surface 2 is open, so the methane fermentation operation can be carried out without interruption. It is.

(f) Effects of the invention According to the examples, according to this method, authentic shochu Aoi Tame IJE m
f) '% resultant sludge concentration, MLSS 311. lI
l+J ~35.1jlll PPM, making high load operation possible.

4. A simple explanatory diagram showing an embodiment of the sedimentation tank of the present invention.
2 is a longitudinal sectional view of the embodiment.

1 Upper tank 2. Rectifier tube 3 Inflow pipe 4 Lower tank 5. Bagged ceramic porous carrier 6 Top and bottom connecting piping 7 Gate valve (butterfly valve) 8 Bypass valve (butterfly valve) 9 Gate valve (butterfly valve) 10 Manhole II iA feed pump 12 Liquid level gauge 13　Upper slide Z^ discharge pipe 14 Bypass pipe 15 Overflow■ Nolchi 16 Sealing lid

Claims (1)

[Scope of Claims] The sedimentation tank is divided into an upper tank and a lower tank, and a rectifying cylinder that passes through the center of the lower tank from the upper tank, and a gate valve are provided in each of the pipes connecting the upper tank and the lower tank. A sedimentation tank equipped with a device that can be shut off at times, and the immobilized carriers filled in the lower tank can be taken out from a manhole to perform bacterial cell inspection and other inspections during methane fermentation operation.