JPS585120B2 - Fermentation method and equipment for sludge, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fermentation method and apparatus for fermenting screen residue, sludge, etc.

A method has been proposed in which screen residue, sludge, etc. are fermented and composted.

However, since these screen residues, sludge, etc. all have different properties, fermentation treatment must be carried out according to their properties, but in conventional fermentation treatment methods, a fixed-shaped fermenter is used, so it is necessary to carry out fermentation treatment according to the properties of the sludge, etc. Difficult to process.

The present invention has been made in view of this, and will now be described based on the illustrated embodiments.

The fermentation treatment apparatus of the present invention can be roughly divided into four parts, and these parts can be freely combined according to the properties of the sludge, etc. to be fermented.

A is a raw material storage tank in which screen sludge, sludge, and other fermented materials collected from sewage treatment plants are stored as fermented materials (referred to as sludge, etc.) that have been adjusted to have the moisture content and air permeability necessary for fermentation. ), and has two shafts 1.1 rotatably supported therein, and a stirring blade 2 is provided on the shaft 1, and the equiaxes are The sludge, etc. in the tank is continuously or intermittently stirred by forcibly rotating in one direction or in the other direction.

Further, at the bottom of this raw material storage tank A, there is provided a rotatable cut-back bed 3 which can be cut back and allowed to fall, and an air pipe 4 for supplying fermentation air into the tank. .

Reference numeral B denotes a fermentation tank, which has the same size as the raw material storage tank described above and is designed so that it can be connected to the lower part of the storage tank, and a cut-back bed 5 is rotatably provided at the bottom of this fermentation tank, and air pipes 6 are connected to each other. establish.

Reference numeral C denotes a lower fermentation tank, which has a hopper shape at the bottom, and its size is determined so that storage tank A or fermentation tank B can be connected to the upper part thereof, and an air pipe (not shown) is provided as necessary.

The internal volume of this lower fermenter C may be approximately the same volume as storage tank A1 and fermenter B, but storage tank A and fermenter B may have the same volume,
The lower fermenter may have a larger volume than the other tanks.

D is a carry-out device that is connected to the lower part of the lower fermentation tank C, and is equipped with a carry-out means 7 such as a screw conveyor inside.

Also, exhaust holes 8 may be provided to prevent sludge and the like from leaking out.

As mentioned above, each of the four constituent parts can be combined arbitrarily depending on the properties of the sludge, etc. to be fermented.
An unloading device is always integrated at the bottom of the lower fermenter.

An example of a combination is in addition to A-C-D shown in the figure. A-B-C-D A-A-C-D A-A-B-C-D A-B-B-C-D A-B-A-B-C-D A-C-D-A-C-D A-B-C-D-A-B-C-D etc., but other union methods can also be adopted.

FIG. 1 and FIG. 2 are examples of the combination of A-C-D, and the fermentation process will be explained next in the internuclear space.

The required amount of sludge, etc. and additives for adjusting air permeability and water content are supplied to the storage tank A, and when the shafts 1 and 1 are rotated while supplying air from the air pipe 4, the sludge, etc. in the tank are added. Primary fermentation of the materials is carried out while mixing and agitation and granulation are performed.

When the fermentation for a predetermined period in the tank is completed, the cut-back bed 3 is opened to allow the sludge and the like to fall back into the lower fermentation tank C.

Air is supplied within this tank to continue secondary fermentation, but the next sludge, etc. is supplied to the upper storage tank.

The desired fermentation is carried out in the lower fermentation tank, and after the completion of fermentation, the discharge means is driven to discharge the sludge and the like in the lower fermentation tank after the completion of fermentation.

This operation is repeated in sequence to perform continuous fermentation processing.

According to the present invention, the fermentation tank is divided into a storage tank, a fermentation tank, a lower fermentation tank, and a transport device, and these can be freely combined according to the nature and maturity of the sludge to be fermented. It also offers the advantage that a complete fermentation process can be performed easily and efficiently, and pretreatment equipment such as mixing, granulation, and storage is not required.

[Brief explanation of drawings]

Figure 1 is a partially cutaway external view, Figure 2 is a sectional view, and Figure 3 is a cross-sectional view.
The figure is a cross-sectional view of the fermenter. A... Raw material storage tank, B... Fermentation tank, C... Lower fermentation tank, D... Carrying out device, 1... Shaft, 2... Stirring blade, 3, 5... Cutting Return floor, 4, 6...Air pipe, 7...
- Carrying out means, 8...exhaust hole.

Claims (1)

[Scope of Claims] 1. Four parts: a raw material storage tank, a fermentation tank, a lower fermentation tank, and a delivery device, which have granulation, stirring, and primary fermentation functions, depending on the properties of the sludge, etc. to be fermented and its maturity level. A method for fermenting sludge, etc., characterized in that a desired fermentation process is performed continuously by arbitrarily combining these units into units. 2. A fermentation treatment device for sludge, etc. is connected to a storage tank equipped with stirring blades and a cut-back bed, a fermentation tank with a cut-back bed, a lower fermentation tank with a hopper-shaped lower part, and the lower part of this lower fermentation tank, A fermentation device for sludge, etc., characterized in that it is divided into four parts, including a carry-out device equipped with a carry-out means, and each unit is selectively combined to form a desired fermentation tank.