JPS583695A - Apparatus for fermentation treatment of sludge - Google Patents

Abstract

PURPOSE:To efficiently carry out fermentation treatment of sludge, by supporting a screw conveyor by a shaft having paddles arranged to the upper and the lower sides thereof above said conveyor and drives said conveyor and drives said conveyor and paddles around the center of a tank, so as to be revolved along the bottom surface in the tank. CONSTITUTION:Sludge before fermentation is supplied into a circular fermentation treatment tank 1 from a throw-in port provided to the upper part of said tank 1 as well as uniformly and wholly accumulated in the tank 1 by driving a leveling plate 18. When air is passed throughout the tank 1 after a predetermined amount of sludge is accumulated therein, the fermentation of sludge is carried out to obtain high temp. fermentation sludge. When a rotary shaft 6 is driven while a screw conveyor 10 and paddles 16 are driven thereby, the conveyor and the paddles are revolved in the tank while rotated and revolved and the lower layer of high temp. sludge is successively gathered to the central part thereof by the screw conveyor 10 to be discharged from a discharge chute 4. The high temp. fermentation sludge in the upper layer part is discended to the lower layer position of the tank by rotation and revolution of the paddles 16.

Description

[Detailed description of the invention] The present invention relates to an apparatus for fermentation treatment of sludge, etc.

It has been proposed that sludge, sludge residue, urban sludge, etc. (hereinafter abbreviated as sludge) collected from sewage processing plants, etc., be fermented and processed into fully matured compost. However, aerobic fermentation of sludge, etc. requires a treatment period of several days or more under certain conditions such as maintaining moisture content, air permeability, and mixing ratio. Since it is difficult to reduce the water content to a level suitable for fermentation by mechanical dehydration alone, other organic substances and chemicals such as lime are added. Therefore, if lime or the like is added and mixed, even if the moisture content can be reduced, the alkalinity becomes high and aerobic fermentation KIII occurs.

The present invention proposes an apparatus that can perform efficient (fermentation) treatment on both highly alkaline sludge and ordinary sludge.

The present invention will be explained below based on illustrated embodiments.

The figure shows a fermentation tank whose internal volume is determined according to the required processing capacity, and the tank is preferably cylindrical in shape, with a flat bottom plate 8 at the bottom and a canopy at the top. The shape is similar to that of the closed type, and a good inlet I for supplying sludge to be fermented is provided in a part of the canopy 8, and a discharge chute 4 is provided in the lower center of the bottom plate. The discharge port of the discharge chute 4 can be opened and closed freely, that is, it is automatically opened when fermented sludge, etc. is discharged, but is always closed at other times.

In addition, a pipe-shaped rotating shaft is installed in the center of the fermentation tank l, and the lower end of the shaft opens into the discharge chute, and the shaft rotates from the bottom or top of the tank. It can be freely supported or suspended. The lower part of this rotating shaft 6 is made to protrude outside the bottom plate, and a sprocket wheel T is fixed to the outer periphery of the rotating shaft 6, and a speed is set via a chain by a drive body 8 such as a motor fixed to the bottom plate or the main body frame. The rotating shaft can be driven by a sprocket wheel or a chain, or by a gear or other type.

A screw conveyor 1° is provided at the bottom of the rotating shaft 6 in a radial direction, that is, passing through the bottom tube of the rotating shaft. The drive device 11rc is driven. This screw conveyor passes through the center of the tank,
In addition, the length is long enough to ensure that sludge, etc. at the bottom of the tank can be discharged.
1 The conveyor drives the sludge, etc., to the central part of the Fi paddle, passes through the lower part of the pipe-shaped rotating shaft, and discharges it from the discharge chute. 11, and a shaft (not shown) is driven from the shaft tg via a gear or other power transmission device tS.

An L-shaped V-shaped cover 14f is provided over the entire length of the screw conveyor 1 so that it is open at the lower part and the front side in the direction of movement. The sludge in the upper layer is discharged by a screw conveyor, and is moved after the sludge in the lower layer by partitioning the upper and lower layers.

In addition, one or two or more stirring blades 1hi are provided at the lower part of the drive shaft, that is, at a position below the screw conveyor of the rotating shaft, so that the sludge, etc. that has been scraped up to the center by the conveyor and has undergone fermentation is discharged through the inside of the rotating shaft. In order to prevent the rotary shaft from being compacted in the discharge chute and to ensure reliable discharge, the rotary shaft is disposed above the drive shaft in such a way that it passes through the screw conveyor and through the rotary shaft. One power transmission device is provided to drive the paddle 16.

A leveling plate tsl is provided at the upper part of the fermentation treatment tank at a position above the paddle, and this leveling plate 18 is installed outside the tank and is rotated by a light-driven device 1g to cover the upper surface of the sludge etc. that has been thrown in throughout the tank. It should be done so that it is even.

A ventilation hole O is provided on the inner bottom or inner circumferential surface of the fermentation treatment tank, and is used to supply air necessary for aerobic generation of the material to be fermented, such as sludge, stacked inside the tank. In addition, 111Fi in the figure is a conveyor that transports sludge, etc. after fermentation to a predetermined position once it is discharged from the discharge chute.
When unexploited mackerel sludge, etc. is fed into the tank from the input port provided on the top S of the circular O fermentation treatment tank, it is evenly stacked throughout the tank by driving the Ktk leveling plate, and a predetermined amount of sludge is placed on the side. When post-aeration is performed, sludge, etc. will ferment and become highly extruded sludge. 1) If you drive the rotating shaft while driving the knee conveyor and paddles, the conveyor and paddles will rotate and revolve in the tank. ] The lower layer of Torion's sludge is sequentially scraped into the center of the tank by a screw conveyor as it rotates, and when it is discharged, it becomes a high-temperature fermentation product in the upper layer of Kyowa.The rotation of the paddle and the metal plate. 2) It is moved onto the tank JIE II which was previously discharged by the screw conveyor, that is, in the rearward direction in the rotating direction of the screw conveyor, and becomes the lower layer position of the cypress. In this way, when the screw conveyor is made to make one revolution in the tank, the sludge, etc. in the lower layer is discharged, and the sludge, etc., which is in the upper layer i1 and has high temperature, is piled up in the lower layer 11 of the cypress.This state At this point, the conveyor and paddle are stopped, and the next unfermented sludge, etc. is discharged from the inlet.
It is fed while driving the leveling board and stacked uniformly to the specified height. This produces exhaust gas (COm) from high-temperature fermentation products.
The waste heat is transferred to the upper layer of unfermented sludge, promoting fermentation. This operation is repeated 9 times in sequence to perform fermentation treatment of sludge, etc.

That is, the fermentation period can be shortened by leaving the high-temperature fermentation material in the lower layer and piling unfermented sludge or the like in the upper layer.

The one shown in Figure 31G4 is an unusual embodiment in which the paddle and conveyor are driven individually, and by stopping the lower conveyor and driving only the paddle, nine different types of sludge are fed into the fermentation escape tank. For example, it is possible to mix sewage sludge and other organic matter within 1 m, and when both the paddle and the conoveyor are driven, it has the same effect as the embodiment shown in Figure 1. Therefore, the paddle The support between the conveyor and the tank is different from that of the embodiment shown in Fig. 1 in order to meet the above-mentioned purpose. The sludge in the upper layer can be transferred to the lower layer while being mixed and turned over, and unfermented sludge can always be stacked on top of the high-fermented sludge. Since the waste heat is transferred, it has the advantage of promoting fermentation of sludge, etc.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view, Figure 2 is a plan view, and line 51 is a partial sectional view showing the relationship between the screw conveyor and the screw conveyor.
Figure lI4 is a diagram of a different embodiment. 1... Fermentation treatment tank 2... Bottom plate S... Canopy 4... Discharge shade 5... Shutter 6... Rotation, Axis 7... Sedge rocket wheel 8... Drive body? ...Cheno 10...Screw conveyor 11.19...Drive device 12...Drive shaft 1! 17...Power transmission device 14...Cover 15...Agitating blade 16...Paddle 1...Leveling plate 20...Vent hole 21...Discharge conveyor

Claims (1)

[Claims] The fermentation treatment tank has an input port at the top and a discharge port at the center of the bottom, and a screw conveyor that rotates along the bottom of the tank. It is rotatably supported at the center and supported by a nine-rotation shaft, and the sludge in the upper layer piled up in the tank is turned around and moved to the lower layer, and the sludge in the lower layer is scraped up to the center by a screw conveyor and discharged. 4. The unfermented sludge was stacked at the top of the pipe. Fermentation treatment equipment for sludge, etc.