JPH1129381A - Apparatus for composting sewage sludge or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus capable of continuously charging of a raw material to the taking out of a fermentation product in the apparatus for composting sewage sludge, etc. SOLUTION: This apparatus for composting sewage sludge, etc., is obtained by composing a looped fermenter 1, loading an agitating device for a raw material on a carriage 2 installed on the fermenter 1 so as to freely run thereon, enabling the agitation device to travel along the fermenter 1 and installing a feeder for the raw material above the starting point of the travel of the agitating device and arranging a takeout device for the fermentation product below the end point of the travel of the agitation device. The raw material fed into the fermenter 1 stays in the fermenter 1 for a prescribed time while being agitated with the traveling agitation device and is fermented and successively taken out to the outside of the fermenter 1. The raw material corresponding to the taken out fermentation product is successively supplemented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to fermenting dewatered sludge discharged from wastewater treatment facilities such as sewerage treatment facilities,
The present invention relates to an improvement of a fermentation device that returns to green farmland as compost.

[0002]

2. Description of the Related Art Conventionally, there are various types of fermentation apparatuses of this type, but the original type is a horizontal scoop fermenter. This type of fermenter is a rectangular fermenter, which supplies raw material whose water content has been adjusted by mixing the raw material and auxiliary materials or product compost at one end, and turning it off with moderate stirring for one or several days. The fermentation is carried out while being moved to the other end, and discharged as a product at the other end. As a modification of this, there is a type in which both ends are connected to form a loop as in the present invention, but there is also a type in which charging is performed in a certain area of a linear portion, and a type in which discharging is performed at a point farthest from the charging portion. In addition, a scoop with a radial length from the center to the circumference is arranged in a circular fermentation tank, and the raw material is supplied to the whole surface or one place, mixed with the raw material being fermented and fermented for a certain period, and then the product is manufactured. There is also a method of taking out

[0003]

In the horizontal fermenter of the horizontal scoop type and the loop type in the type of fermenter, after adjusting the water content, the raw material is supplied to a certain area and fermented while moving in a certain direction. However, before the raw materials were supplied, mixing with auxiliary materials or product compost for moisture adjustment was required, and equipment and operation management for this were required. Also,
In a circular tank, the raw material is stirred and mixed uniformly with the fermented material during the fermentation during fermentation, so there is no need for additional auxiliary materials and mixing equipment. Since a period of 1 to 2 weeks is required, charging cannot be performed during this period, and the operation is intermittent, and continuous operation cannot be performed.

[0004]

According to the present invention, in order to solve these drawbacks, the charging section is a circular tank into which raw materials can be charged as they are, and the period required for fermentation is secured by the subsequent straight section and the reversing section. , Can be taken out as a product. Further, because of the endless structure, the product compost for moisture adjustment required at the time of charging can be circulated and flow into the circular portion.

That is, the gist of the present invention is to form a loop-shaped fermenter by arranging a pair of tanks in parallel and closing the left and right ends with semicircular walls having a radius equal to the width of the tank. A carriage is provided on the upper surface of the straight side wall of the fermenter so as to be able to reciprocate, and a swivel base is rotatably provided on the carriage, and the width of the swivel base is inserted into the width of the tank body. A turning device for the raw material extending toward the bottom surface of the fermenter, a distributing device for the raw material positioned above the turning device and extending in the width direction of the turning device, and a swivel of the swivel base above the base end of the distributing device. A hopper for supplying the raw material is provided at the center, and an outlet for the fermented raw material is opened at the lower side of the fermenter.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The apparatus according to the present invention is configured as described above, and the raw material to be fermented is supplied from above to the turning center of the turning device at the turning position of the turning device, and the material is fed by the distribution device. It is fed radially and fed to the circular end of the fermenter evenly. When a predetermined amount of the raw material is loaded in the fermenter, the switching device advances from the circular tank to the straight tank and circulates in the fermenter.

In this turning operation, the turning device extends toward the bottom of the fermenter as described above, and the raw material at the bottom is lifted upward and released to the rear in the traveling direction. (Detailed structure will be described later.)
When the bogie moves forward in the straight portion and reaches the circular portion at the other end, the bogie stops and the turning device turns around the center of the circular portion, and the raw material in the circular portion is also turned back.

When the turning device turns and reaches its end, the bogie moves forward in the fermenter on the other side, turns the raw material in the device by the turning device, and returns to the above-mentioned starting point. As described above, the raw material supplied to the fermentation tank was returned once by the return device making a round in the tank, and at the end where the return device reached, some of the raw material in the circular tank was removed from the straight tank. , Which is supplied in the circular tank. When the above-described switching operation is repeated a predetermined number of times to complete fermentation, the fermenter is taken out of the system from the bottom of the fermenter at the terminal position of the switching device.

As is apparent from the above description, according to the present invention, the raw material is charged into the fermenter while crushing and stirring, and is fed to an average level. In a state where the fermentation is completed as desired in the tank in this way, the fermentation is completed as desired, and the fermentation is taken out of the system at the revolving end portion of the turning device, and the amount of fermentation is matched. The amount of the raw material is appropriately replenished and a continuous fermentation operation is possible. Since the raw material to be replenished at this time is replenished little by little on the fermented raw material, the atmosphere in the fermenter is not impaired, and precise adjustment of moisture and the like is unnecessary. In addition, since it is put into a large amount of fermentation raw material, there is no trouble such as adhesion to the switching device. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0010]

FIG. 1 is a schematic plan view of a fermenter of a composting apparatus according to the present invention. The fermenter 1 has a pair of parallel side walls 1a, 1a and side walls 1 for closing both ends of the side walls.
A semi-circular wall 1b, 1b having a diameter equal to the distance between a and 1a and an intermediate wall 1c between the side walls 1a and 1a, and have a track shape in plan view. A carriage 2 as shown in FIGS. 2 to 5 is reciprocally mounted on the upper surfaces of the side walls 1a and 1a.

On the trolley 2, a revolving gantry 3 as shown in FIGS. 2 to 5 is mounted so as to be rotatable around the center of the trolley 2. As shown in FIGS. 3 and 5, the raw material supply cylinder 4 is provided with a raw material supply cylinder 4 and a raw material crushing distribution paddle 5a whose starting end is located below the supply cylinder 4. Further, a bucket conveyer 6 for turning back the raw material having a width substantially corresponding to the length of the distribution tube 5 is hung below the distribution tube 5.

The lower end of the bucket conveyor 6 extends to the vicinity of the bottom of the fermenter 1 so that the raw material scooped up by the bucket 6a can be thrown backward in the traveling direction of the carriage 2. (See arrow d in FIG. 3) A slip ring 4a connected to a power supply is mounted on the outside of the supply tube 4, and the current from the power supply is turned back and forth, and a reciprocating motion of the distribution device and the like are turned. Power can be supplied to each drive motor regardless of Each drive motor is as shown in FIG. 2 to FIG. 5, reference numeral 2a is a truck drive motor, 3a is a swing frame drive motor, 5b is a distribution paddle drive motor, and 6b is a bucket conveyor drive motor. It is a motor.

On the other hand, at the bottom of the side wall of the fermenter 1 is provided an air diffuser 1d for fermentation of the raw material. (See FIG. 3). A screw conveyor 7 for taking out the raw material is provided. Reference numeral 7a denotes a takeout chute. Further, a raw material supply port 8a of a screw conveyor 8 for supplying a raw material is opened above the supply cylinder 4 in the raw material supply section so as to face the hopper 4b. (See Fig. 5)

To ferment raw materials such as sludge with the fermentation apparatus configured as described above to make compost, the following is performed. First, the fermenter 1 contains water 3 which can be called seed compost.
About 5% of raw sludge is charged about half. Next, a raw material having a water content of about 80% is appropriately introduced onto the raw material, and the raw material moisture in the tank is adjusted to about 55%. This water supply 8
Sludge of about 0% is the moisture value of raw sludge treated and discharged by a general dehydrator such as a belt press. This means that the sludge to be fed into the fermenter 1 requires special adjustment of moisture and the like. It means that raw sludge can be fed as it is and fermented.

The raw sludge is supplied once a day for about 30 minutes (an amount commensurate with the amount of compost product) to the raw sludge in the tank whose moisture has been adjusted as described above. The position of the trolley 2 at the time of supplying the raw sludge is 2 in FIG.
As shown by the dashed line, it stops at the right circular portion, and the revolving gantry 3 and the bucket conveyor 6 are operating. As described above, when the input of the raw materials is completed, the cart 2 is advanced as shown by the arrow A in FIG. The raw material charged in the tank is scraped upward from the bottom thereof by the bucket conveyor 6 of the turning device which is operated simultaneously with the forward movement, and is thrown backward.

That is, the raw material in the tank is agitated from the lower layer to the upper layer, and the material is turned back. The sludge is turned to the left in FIG. 1 to turn the raw sludge back to the right. Then, the bogie 2 stops in the left circular tank portion, and at the same time, the revolving gantry 3 rotates and the turning device turns the raw material in the circular tank portion in the same manner as described above. When the turning of the raw material in the circular tank is completed, the bogie 2 starts moving backward (to the right in FIG. 1), and the raw material in the adjacent linear fermenter 1 can be turned. is there.

In this way, when the turning device reaches the circular portion on the right side of FIG. 1, the bogie 2 stops, and only the turning device turns and turns the raw material in this portion as described above, and the turning device starts. Return to position to complete the tour cycle. In the patrol of the switching device described above, the switching of the switching device from the linear portion to the circular portion and the switching from the circular portion to the linear portion are, of course, automatically performed using a sensor or the like.

The cycle time of the switching device in the above-described processing operation depends on the amount of the raw material to be processed, but it is usually about one hour once per day and the raw material is input once a day. It is. The input raw material is transported in the direction of the arrow B by being thrown backward by the switching device, and the raw material in front of the starting point of the switching device stays in the tank for the longest time and becomes fully matured. Therefore, the removal of the ripe raw material is withdrawn as shown in FIG. The compost product extracted from here is kept in the tank for about two weeks from the input, and as described above, the raw material in an amount corresponding to the amount of the ripe product is used for the extracted compost product. It will be replenished.

In the above-described sludge composting apparatus, when sludge having a high water content (80 to 85%) such as sludge agglomerated using a polymer flocculant is treated, the amount of fermentation heat is insufficient. At the same time, the sludge may adhere to the distribution device and the switching device. For the former, it is sufficient to supply hot air from the illustrated diffuser pipe 1d to compensate for the lack of heat. By dispersing and dropping on sludge that has been fermented and has low moisture by using a distribution paddle as described above, it is possible to perform treatment without sticking to the bucket 6a.

[0020]

As described above, the composting apparatus according to the present invention can immediately obtain a desired compost product by immediately putting the dewatered raw sludge into the treatment tank without performing precise pretreatment such as moisture adjustment. In particular, once the treatment conditions are determined according to the sludge to be treated, compost products can be obtained continuously, and the operability of this type of conventional apparatus can be significantly improved. It is.

[Brief description of the drawings]

FIG. 1 is a plan view of a fermenter for explaining the operation of a turning device in a composting device according to the present invention.

FIG. 2 is a plan view of a switching device.

FIG. 3 is a side view of FIG. 2 showing a part in section.

FIG. 4 is a partially cut away view of the plane of the turning device.

FIG. 5 is a partially cut away view of the front view of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fermenter 2 Cart 3 Swivel base 4b Hopper

Claims (1)

[Claims] 1. A pair of tanks are arranged side by side, and left and right ends thereof are closed with semicircular walls having a radius equal to the width of the tank to form a loop-shaped fermenter 1. A carriage 2 is provided on the upper surface of the side wall so as to be able to reciprocate, and a trolley 3 is rotatably provided on the trolley 2. The width of the trolley 3 is inserted into the width of the tank body, and the fermenter 1 Device for turning the raw material extending toward the bottom surface of the turning device, a device for distributing the material located above the turning device and extending in the width direction of the turning device, and a center of rotation of the rotating base 3 above the base end of the distributing device. And a composting device for sewage sludge and the like, in which a hopper 4b for supplying a raw material is provided in a position of the fermenter 1 and an outlet for fermenting raw material is opened in a lower portion of the fermenter 1.