JPS6339229Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air supply device that doubles as a trapdoor and is installed at the bottom of an aerobic fermentation tank for composting sewage sludge and the like.

When dehydrated sludge discharged from a sewage treatment plant is composted in a vertical fermenter, dry sludge or fermented sludge is added to adjust the moisture content of the sludge, and then the sludge is put into the upper fermenter. The fermentation process is carried out by adding appropriate agitation to maintain air permeability and supplying the air necessary for fermentation from the air supply device at the bottom of the tank. After a certain fermentation period, the trap door at the bottom of the tank is opened to drain the sludge. It is designed to fall and be transferred to the lower fermentation tank. In this case, as fermentation progresses, the moisture content of the sludge in the fermenter decreases and it becomes finely powdered. Therefore, in an air supply device with many ventilation holes on the top surface, the sludge powder passes through when the ventilation is stopped. There is a problem that the air enters the air supply device through the pores, and when the air supply is restarted, uniform ventilation cannot be achieved.

The present invention solves the above problem by making the ventilation plate separate from the bottom when the trap door is opened in an aeration device that has a ventilation plate on the top surface as an air supply device that also serves as a trap door at the bottom of a fermenter. It is something. In other words, the fermenter air supply device of the present invention is a trap door type air supply device arranged in a row at the bottom of the fermenter, and each trap door is simultaneously rotated around each air supply pipe pivotally supported in the fermenter. The ventilation plate, which is formed in the shape of a movable box and covers the open upper surface thereof, is attached to the air supply pipe side with a hinge so that the ventilation plate separates from the lower part of the box when the trap door is opened.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to embodiments shown in the accompanying drawings.

In this embodiment, an air supply device 1 is constructed by arranging unit air supply devices 1' in a row at the bottom of a fermenter (not shown).
Each unit air supply device 1' has a lower part formed into a box shape by a lower plate 2 and a side plate 3, and its open upper surface is covered with a ventilation plate 4. Each air supply device 1' has one end fixed to each air supply pipe 5 that is pivotally supported in the fermenter, and is of a trap door type that rotates around the air supply pipe 5 to open and close. The air supply devices 1' arranged in a row in this way form the bottom of the fermenter.

The ventilation plate 4 has a large number of ventilation holes 6 on its entire surface, and its air supply pipe 5 side is attached with a hinge 7, so that it overlaps the box-shaped lower portions 2 and 3 of the air supply device 1' and can be opened and closed. There is. The air necessary for fermentation is supplied to each air supply pipe 5 via a rotary joint (not shown).
The air enters the box of the air supply device 1' through a ventilation hole 8 provided in the air supply pipe 5, and is uniformly supplied into the accumulated sludge through the ventilation hole 6. In this embodiment, the upper surface of the ventilation hole 8 is protected by an L-shaped steel 9 to prevent sludge from falling into the air supply pipe 5.

In each air supply device 1', air supply pipes 5 are interconnected via a link mechanism 10, and when the sludge falls and moves, they are simultaneously rotated via the link mechanism 10 by a power cylinder (not shown), etc., as shown in FIG. The trapdoor is now open. In this case, the ventilation plate 4 hangs down from the hinge 7 to form a box-like lower part 2, 3 of the air supply device 1'.
be further apart. The sludge that has entered the air supply device 1' and accumulated in this way is discharged every time the sludge is transferred.
There is no need to clean the inside of the box to maintain uniformity of ventilation, making maintenance and inspection of the fermenter easier.

The functions and effects of the device of the present invention are already clear from the above description of the structure.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a part of an embodiment of the air supply device for a fermenter according to the present invention, with the front side plate removed, and Fig. 2 is a longitudinal cross-section of a part of the air supply device in the closed state. Side view,
FIG. 3 is a longitudinal sectional side view of the same part in the open state. 1...Air supply device, 1'...Unit air supply device, 2...
...lower plate, 3...side plate, 4...ventilation plate, 5...air supply pipe, 6...ventilation hole, 7...hinge, 8...ventilation plate,
9... L-shaped steel, 10... Link mechanism.

Claims (1)

[Scope of utility model registration request] It is a trapdoor-type air supply device arranged in a row at the bottom of a fermentation tank, and each trapdoor is formed into a box shape that rotates simultaneously around each air supply pipe pivotally supported in the fermentation tank, and its open top surface is The ventilation plate that covers the air supply pipe is attached with a hinge on the air supply pipe side, so that the ventilation plate separates from the box-shaped bottom when the trap door is opened.