JPS6156040B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a methane fermenter that reduces the amount of digestive fluid containing inoculum introduced at the initial stage of fermenter operation, and improves the efficiency of organic waste input during steady operation. It is something.

Methane fermentation takes place in an anaerobic atmosphere, so it is necessary to prevent air from entering the fermenter. Generally, methane fermenters with an inlet have a water-sealed structure. Conventional examples are shown in Figs. 1 and 2.

Reference numeral 1 designates a fermentation container having a water overflow port 2 on its side wall, and 3 designates a lid of the fermentation container having an inlet 4 and a gas outlet 5. The input port 4 is sealed with water to prevent air from entering the fermentation container 1. 6 is a submersible pump.

Here, Figures 1 and 2 show cases where the lower part of the input port 4 is long and short, and comparing the two, it is found that when the input port 4 is long, the lower part of the input port 4 is long and short as shown in Figure 1. The water seal position (lower end of the inlet) is low, and the amount of digestive fluid containing the initial starter bacteria is small. On the other hand, after that, organic waste is introduced, and the liquid level in the fermentation container 1 rises due to water generated by the decomposition of the waste, and the length of the water seal part of the input port 4 (indicated in the figure) gradually increases. In the steady state where flooding occurs, the length of the water seal reaches its maximum. Therefore, when charging organic waste, as the length of the water seal increases, the resistance to the waste passing through the input port 4 increases, making the charging operation most difficult even in a steady state. Furthermore, since the specific gravity of organic waste is generally equal to 1, it cannot be expected that it will pass through the water seal of the input port 4 using its own weight alone. Therefore, the worker is forced to perform troublesome work such as pushing the product with a stick or the like.
Alternatively, some fermenters are equipped with a device for automatically or manually pushing the material into the input port 4 as a measure against this problem, but this has the drawback of complicating the configuration, increasing costs, and increasing the number of maintenance points.

On the other hand, when the input port 4 is short, as shown in FIG. 2, the water seal position of the input port 4 (lower end of the input port) is high, so there is a drawback that a large amount of digestive fluid containing the initial seed bacteria is required. However, even in steady state, the input port 4
Since the length of the water seal is short, the charging resistance is small, and the organic waste can smoothly pass through the input port 4, which has the advantage of eliminating the troublesome loading process that would be required when pushing it in with a stick.

The present invention eliminates the above-mentioned drawbacks and takes only the advantages, and will be explained below with reference to FIG. 3.

7 is a fermentation container, and an overflow pipe 8 is arranged on the side wall. Additionally, the U-shaped portion of this overflow pipe is always sealed with water. Reference numeral 9 denotes an input port whose lower end is sealed with water, which is kept airtight by a removable gasket 10, and has an inner cylinder 11 having a tubular portion longer than the tubular portion of the input port 9. 12 is an outlet of the submersible pump 13, which is connected to the lid 15 along with the inlet 9 and the gas outlet 14.
It is located in 16 is a lid of a pump outlet having a gas outlet 17.

To briefly explain the operation of the above configuration, organic waste inputted from the input port 9 is crushed and stirred by the submersible pump 13 in the fermentation container 7, fermentation is promoted, and the organic waste is decomposed into water and gas. Gas is taken out from the gas intake ports 14 and 17 and stored in an external gas tank or the like, and water overflows from the overflow port 8 each time.

Here, the gist of the present invention, which is to reduce the amount of digestive juice input as seed bacteria at the initial stage of operation of the fermenter and to improve the efficiency of the operation of inputting organic waste during steady operation, will be explained.

At the start of fermenter operation, the inner cylinder 11 is inserted into the input port 9.
is removably and airtightly provided, and the actual position of the water seal in the inlet is at the lower end of the inner cylinder 11. Therefore, the amount of digestive fluid to be used as the inoculum required is only up to a position slightly above the lower end of the inner cylinder 11 (liquid level B in the figure). Thereafter, the organic waste thrown in is decomposed into water and gas, and the liquid level rises, reaching a steady state at the liquid level A, which overflows from the overflow port 8. At this point, the lower end of the inlet 9 goes below the liquid level and is sealed with water, making the inner cylinder 11 unnecessary. Therefore, by removing the inner cylinder 5, in a steady state, the water seal part of the input port 9 is short, so when inputting organic waste, the waste can be smoothly inserted into the input port without receiving much resistance from the input port 9. 9 into the fermentation vessel 7.

In addition, in a steady state, since there is no inner cylinder 11 that may obstruct stirring, smooth stirring is achieved, which is also effective in promoting methane fermentation.

As described above, according to the present invention, with a simple configuration (low cost), it is possible to reduce the initial amount of sludge input, improve the efficiency of organic waste input and the input work during normal operation, and furthermore make it smoother. Stirring has the great effect of promoting methane fermentation.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of a conventional methane fermentation tank, and FIG. 3 is a cross-sectional view of a methane fermentation tank including an embodiment of the present invention. 7... Fermentation container, 8... Overflow pipe, 9... Inlet, 10... Packing, 11... Inner cylinder.

Claims (1)

[Claims] 1. A fermentation container with an open top, a lid having an input port for kitchen waste and sealing the opening of the fermentation container, and an inner cylinder that is detachable and kept airtight inside the input port. A methane fermentation tank is provided in which the length of the water seal part of the inner cylinder is longer than the length of the water seal part of the input port.