JP2001129597A - Method for deodorizing treatment of sludge and sludge composted granular soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deodorizing treatment method generating no malodor of industrial waste of organic activated sludge such as sewarage sludge or excretion sludge and granular soil obtained by composting sludge by the deodorizing treatment method. SOLUTION: Organic activated sludge, dry grass compost, smoked charcoal, clayey soil and an adhesive are stirred and mixed by a mixer to form a sludge mixed material which is, in turn, molded into a granular or pellet-like molded object and the surface of this molded object is coated with a lime layer and subsequently coated with earth and soil and the coated molded object is dried.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for deodorizing industrial waste of organic activated sludge such as sewage sludge and human waste sludge without generating offensive odor, and to granular soil obtained by composting sludge by the processing method. .

[0002]

2. Description of the Related Art Conventionally, there are many techniques for composting industrial waste of organic activated sludge. It has been clarified that these organic activated sludges give good results to crops by a soil improvement effect not found in chemical fertilizers. In addition, the treatment of organic activated sludge has become a social problem in terms of the installation location and treatment method because it is necessary to consider the impact on the treatment facility of the disposal site and the local environment. As means for composting organic activated sludge, conditions such as temperature, moisture, air, and the presence of microorganisms are prepared in a fermentation tank, and fermentation is performed for a required period to compost, that is, compost.

[0003]

However, organic activated sludge such as sewage sludge and human waste sludge is mainly anaerobic and therefore has a peculiar malodor, and these sludge raw materials are fermented and directly composted. In that case, the odor would remain as it was, and it would have a great impact on the environment when used as compost.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a composted granular soil that can be easily handled while removing the bad smell of the organic activated sludge as a raw material for the sludge and performing a composting process to recycle the sludge. For this purpose, the following configuration is adopted.

[0005] The first invention to be patented is that an organic activated sludge and dry grass compost, kun charcoal, clayey soil and an adhesive are stirred and mixed by a mixer to form a sludge mixture, and this sludge mixture is granulated. And a method of deodorizing sludge, comprising treating a pellet-shaped molded body, coating the surface of the molded body with a lime layer, applying soil and drying, and drying.

[0006] In the sludge mixed material, a lime coal having an adsorption effect is stirred and mixed to form a molded body, and the surface thereof is coated with a lime layer, so that the peculiar odor of the organic activated sludge is removed. It could be deodorized. In addition, since the outermost peripheral surface of the molded body is coated with earth and sand and dried, it can be deodorized, and the lime layer that has been coated does not peel off and maintains the odorless state for a long time. be able to.

[0007] A second invention which is to be patented is an organic activated sludge having a weight ratio of 80% and a dry grass compost having a weight ratio of 5%.
Kun charcoal, 10% viscous soil and an appropriate adhesive are stirred and mixed with a mixer to form a sludge mixture, and this sludge mixture is formed into granular and pellet-shaped molded bodies of about 2 mm to 5 mm. This is a sludge composting granular soil characterized in that after the surface is coated with a lime layer, earth and sand are applied and dried.

[0008] The present invention is a granular soil produced by the treatment method of the first aspect of the present invention, wherein the sludge mixture is formed into a predetermined shape, and its surface is covered with lime or earth and sand. . Also, when sprayed on the soil of agricultural crops, the main raw material of the sludge mixture is organic activated sludge, so that good results are given to agricultural crops by the soil improvement effect of organic microorganisms. In addition, since dried grass compost and kun charcoal are also mixed in the sludge mixture, the environment for breeding microorganisms is good, and the compost is effective.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a method for deodorizing sludge, and FIG. 2 is a flow chart showing sludge composting produced by the same method. It is a schematic cross section of soil.

First, as the sludge raw materials, an organic activated sludge having a weight ratio of 80%, a dry grass compost of 5%, a coal of 5%, and
Prepare 0% cohesive soil. Sewage sludge and human waste sludge are used as the organic activated sludge. Since most of these organic activated sludges are anaerobic, microorganisms do not propagate effectively, so that they have a putrefactive odor and are a cause of generation of offensive odor. The dried grass compost may be shredded in millimeters in advance, or may be any size that can be easily kneaded when stirring and mixing. Kun charcoal is preferably in the form of powder, and when stirred and mixed with other sludge raw materials, it absorbs malodorous components and deodorizes. The cohesive soil, together with an adhesive described later, improves shape retention and moldability.

An appropriate adhesive is added to the sludge raw material 1 and the mixture is stirred and mixed by a mixer to form a sludge mixture 2. Table 1 shows the mixing ratio.

[0012]

[Table 1]

The sludge mixture 2 which has been stirred and mixed as described above
Is molded into a granular and pellet-shaped molded body 3. The size does not need to be constant, and varies in size, approximately 2 mm to 5 m.
A size and shape of the order of m may be sufficient. Next, the outer surface of the molded body 3 is coated with a lime layer 4. In the coating treatment, the molding 3 is put into a lime liquid tank or a lime powder tank, and the outer surface of the molding 3 is coated with the lime layer 4 to form the lime molding 5. Thereafter, the soil layer 6 is applied to the outer surface of the lime molding 5 to form the earth and sand molding 7, and then the drying treatment 8 is performed to deodorize the soil, thereby completing the sludge composting granular soil 9. The drying process may be sun-dried, but a dryer may be used.

The completed sludge composted granular soil 9 is covered and formed by the earth and sand tank 6 and the lime layer 4, so that the internal odor components are not radiated to the outside. Moreover, since the malodorous component of the organic activated sludge is adsorbed by the coal coal inside, it is deodorized. In addition, since it is in a dry state, it can be handled well, and when it is sprayed on the soil, it can be integrated with natural soil to improve fertile soil by absorbing moisture.

[0015]

The first invention to be patented is that the organic activated sludge is mixed with dried grass compost, coal charcoal, cohesive soil and an adhesive with a mixer to form a sludge mixed material. After processing into a granular and pellet-like molded body, after coating the surface of the molded body with a lime layer,
This is a method for deodorizing sludge, characterized by applying soil and drying.

[0016] In the sludge mixed material, a lime coal having an adsorption effect is stirred and mixed to form a molded body, and the surface thereof is coated with a lime layer, so that the peculiar odor of the organic activated sludge is removed. Can be deodorized. In addition, since the outermost peripheral surface of the molded body is coated with earth and sand and dried, it can be deodorized, and the lime layer that has been coated does not peel off and maintains the odorless state for a long time. be able to.

A second invention which is to be patented is an organic activated sludge having a weight ratio of 80% and a dry grass compost having a weight ratio of 5%.
Kun charcoal, 10% viscous soil and an appropriate adhesive are stirred and mixed with a mixer to form a sludge mixture, and this sludge mixture is formed into granular and pellet-shaped molded bodies of about 2 mm to 5 mm. This is a sludge composting granular soil characterized in that after the surface is coated with a lime layer, earth and sand are applied and dried.

According to the present invention, the sludge mixed material is formed into a predetermined shape, and its surface is covered with a lime layer or a soil layer, so that the handling becomes good. Further, when sprayed on the soil of agricultural crops, the main raw material of the sludge mixture is organic activated sludge, so that it is an environment in which organic microorganisms can easily propagate, and good results can be given to agricultural crops by soil improvement. In addition, since dried grass compost and kun charcoal are also mixed in the sludge mixture, the environment for breeding microorganisms becomes favorable, and the soil becomes effective as composted granular soil.

[Brief description of the drawings]

FIG. 1 is a process chart showing a method for deodorizing sludge according to the first invention.

FIG. 2 is a schematic sectional view of a sludge composted granular soil according to a second invention produced by the same treatment method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sludge raw material 2 Sludge mixed material 3 Molded body 4 Lime layer 5 Lime molded body 6 Earth and sand layer 7 Earth and sand molded body 8 Drying treatment 9 Sludge composting granular soil

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Claims (2)

[Claims] 1. Organic activated sludge and dried grass compost, Kung charcoal,
The viscous soil and the adhesive are stirred and mixed with a mixer to form a sludge mixture, and the sludge mixture is processed into a granular and pellet-shaped molded body, and the surface of the molded body is coated with a lime layer, and then the soil and sand are removed. A method for deodorizing sludge, characterized by coating and drying. 2. Organic activated sludge having a weight ratio of 80% and 5%
Dry grass compost, 5% Kun charcoal, 10% viscous soil and an appropriate adhesive are mixed by stirring with a mixer to form a sludge mixture, and the sludge mixture is formed into granules and pellets of about 2 mm to 5 mm. A sludge composted granular soil formed by molding into a molded body, coating the surface with a lime layer, then applying soil and drying.