JPS59184786A - Fermentation treatment of organic waste - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fermentation treatment of sewage sludge, animal dung, and other organic waste, and its purpose is to improve the quality of the product and to prepare a subsieve mixture for making bean products. It is about increasing the amount.

Conventionally, when sewage sludge, animal dung, etc. are converted into feces by aerobic fermentation, it is difficult to carry out efficient aerobic fermentation if organic waste S such as these has a high moisture content. Therefore, in order to adjust the moisture content and air permeability and promote fermentation, a coarse fermented product to which organic matter C such as bark, sawdust, rice straw, and rice husk has been added is used as the reflux R. Then, the mixture S, C, and R in the required proportions is subjected to aerobic fermentation, and the fermented products are sieved to produce products with a particle size smaller than the required particle size, that is, fine products, and all the crude products with larger reflux are processed into a fermenter. It is then sent back to the factory and fermented again. Therefore, as a result of this, the product has a large proportion of coarse particles on the sieve, and the ratio of fine particles to the product is reduced, and lumps in the reflux, such as bark areas, are not subject to aerobic decomposition and are simply fermented. It only circulates within the tank as a reflux product during the process.

The present invention has been made in view of the above drawbacks, and involves sieving a fermented product obtained by mixing waste with added organic matter for adjusting aerobic fermentation. The gist is to take out the product and a part of the coarse product with a predetermined particle size or more and use it as a reflux product.

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

Organic waste S, such as sewage sludge, is mixed with organic additives C, such as bark, sawdust, rice husk, and rice straw, and reflux R, in the required ratio, to create air permeability and moisture content suitable for aerobic fermentation. The prepared mixture is supplied to the fermenter 1 and aerated to carry out the desired aerobic fermentation. The fermentation product produced in this way is then subjected to sieving 2 to separate coarse particles with a predetermined particle size or more and fine particles smaller than that, and the fine particles are taken out as a product and the crude product is separated. is extracted as a crude product if necessary.

Further, a part of this crude product is crushed to a required particle size in a crusher 3, and this crushed product is reused as a reflux R.

When the moisture content of the product is below 40%, the finer the product is, the smaller the particle size and the better the appearance, and even if the inside is unfermented, the refluxed product as additive compost can be refluxed. This completes the fermentation.

Next, the relationship (weight distribution) between the particle size of the organic additive (W skin) and the particle size of the input mixture and product is shown in the following table.

Table CI) The following table also shows the amount of product after fermentation (volume ratio) relative to the input mixture.

Therefore, as shown in Table 0) and Table 01), it has been found that if the particle size of the bark is moderately fine, there will be more product caps, and conversely, there will be less crude products, which is extremely convenient from an industrial perspective. did.

Therefore, according to the present invention, the crude product in the fermentation product contains lumps, and even if the inside is unripe, it is preferable to crush this and return it to the fermenter as a reflux product. C
Since the moisture content of the product before crushing is 40% or less, it is easy to crush and has the advantage of increasing the amount of product taken out.

[Brief explanation of drawings]

The drawing is a flow sheet of the fermentation treatment method of the present invention. 1...Fermentation tank 2...Sifting 6...Crushing machine & ten

Claims (1)

[Claims] In the fermentation treatment of organic waste such as sewage sludge, the fermented product is mixed with organic matter added for aerobic fermentation adjustment, and the fermented product is completely sieved. 1. A method for fermentation treatment of organic waste, characterized in that a product is taken out as a product, and a part of the coarse product having a predetermined particle size or more is crushed and used as a reflux product.