JPS5855391A - Method of composting 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 composting organic waste collection, in which organic waste is mixed with a fermented product and then treated in an aerobic fermenter.

In the above method, it is preferable to maintain the temperature in the fermenter at a relatively high temperature in order to increase the activity of aerobic bacteria.
Conventionally, when oxygen-containing gas is supplied to a fermenter, the temperature of the supplied gas is low, making it difficult to raise the temperature inside the tank, which makes it difficult to increase the activity of aerobic bacteria.
Starting $! &! At this time, as the activity of aerobic bacteria increases, the temperature inside the fermenter increases, and as a result, the moisture in the fermenter decreases, the activity of aerobic bacteria decreases, and the efficiency of fermentation treatment decreases. Ivy is a problem that decreases. ! @, Air 11 [6] Ammonia gas and other foul odors were generated due to the process, and there was room for improvement in terms of environmental hygiene.

In view of the above points, the present invention makes it possible to solve the problem of environmental deterioration caused by exhaust gas generated during fermentation processing, and effectively utilizes the exhaust gas from the fermentation tank and fermentation process. Suppresses the drop in the temperature inside the tank or the decrease in water content in the tank due to the supply of oxygen-containing gas at a temperature much lower than the temperature inside the tank. The purpose is to make it possible to improve IJ1 management efficiency tPIIk economically.

Next, embodiments of the uninvented method will be described with reference to illustrative drawings.

sewage sludge and seed sludge respectively in the 7th and 7th cohopper if)
Hat! lt to the mixing device il+ and mixing IIJ1
flI.

The mixed product is supplied to a fermentation tank and allowed to accumulate there, and air is supplied from below by a blower Ill K, causing Wll&Fll8 to be generated by the activity of aerobic bacteria, and the surplus in the gas generated due to fermentation is removed. 9 Exhaust gas such as air is removed from the exhaust passage (-1
While discharging to outside 11 through
The compost is fed into a hopper (!1), and on the other hand, it is removed as it is or, if necessary, after further fermentation, drying, etc.*1, to obtain compost as a product.

A heat exchange device (81t) is installed in the power gas discharge path (6), and an air supply path (9) equipped with the blower (81) is passed through the heat exchange device (81) to the fermenter (4). The supplied air is preheated by effectively utilizing exhaust gas.

In addition, by interposing an exhaust gas treatment device in the gas exhaust passage (@1) and supplying water to the exhaust gas whose temperature has been lowered due to preheating, or by supplying the exhaust gas into water and bubbling it, Water is brought into contact with the exhaust gas, and malodorous gases contained in the exhaust gas, mainly ammonia gas, are captured in the water and deodorized.

The condensed water from the heat exchange device il+ and the water after exhaust gas treatment from the exhaust gas treatment device A are transferred to a PH adjustment tank (1 liter).
iC is supplied, and an acidic agent such as sulfuric acid or hydrochloric acid is added to the river to neutralize it, and the water after the neutralization is supplied to the settling tank II and stored there.

After the neutralization treatment, water with particularly concentrated impurities is supplied from the settling cypress bowl through a fermentation tank T411C and a pipe pipe equipped with a pump equipped with an on-off valve A4, and the excess water is transferred to a post-heating device. It is supplied at 0 o'clock, subjected to post-treatment such as sterilization, and then discharged.

Temperature or moisture sensor 0η in the fermenter (4)
A system is set up to detect whether the temperature or water content in the tank has fallen below the set value, input the detection result to controller I, automatically operate the on-off valve ) Supplying K water - In other words, in the fermenter (4), the temperature inside the tank rises as the activity of aerobic bacteria increases and fermentation is promoted, but as a result, the water in the tank evaporates. This causes a lack of moisture suitable for fermentation, resulting in a decrease in the activity of aerobic bacteria, resulting in kernels whose temperature drops rapidly. Based on the detection of #i and the fact that the water content has fallen below the set value, a lack of water in the tank is detected, and water is automatically supplied via the on-off valve 04 to increase the aerobic activity.

The tank 9 has 6 types of acidic chemicals and neutralization treatment m.
The ammonium salts (ammonicum chloride in ammonium sulfate) that are produced along with this process may accumulate, or when water is supplied to the fermenter (4), these ammonium salts are transferred into the fermenter as compost. It will be collected, and neutralization 4
fl-You can use physical materials without wasting them, and after! IJ1j
The ammonium salt removal process in the I apparatus α- can be simplified.

In the above example, 11
It was J611! & I try to use processed materials,
Separately treated waste products, sewage sludge, foreign waste products, etc. are required. Along with this, various types of fermentation can be carried out as long as it is possible to promote the fermentation of sewage sludge to be composted or to adjust temperature, moisture, etc.! & Can be applied to processed materials.

The oxygen-containing gas may be supplied to the fermenter (4) by natural ventilation without using a blower.

Further, instead of air, highly concentrated oxygen gas, pure oxygen, etc. may be used.

The invention is applicable not only to the composting of sewage sludge as described above, but also to the composting of various organic wastes, such as raw sludge, industrial wastewater sludge, agricultural residue waste, and municipal garbage. .

In summary, in the method for composting organic waste mentioned above, the oxygen-containing gas supplied to the fermenter 14) is preheated by the exhaust gas from the fermenter (4), and the exhaust gas after preheating is Deodorizes JiJ1j by contacting it with water!
At the same time, part of the water after exhaust gas treatment is transferred to the fermenter (4).
) to be characterized by t-.

In other words, by effectively utilizing the exhaust gas taken out from the fermenter (4) at high temperature, and preheating the oxygen-containing gas to the fermenter (4), the fermenter (4) can be heated without adding a special heating device. 4) Low temperature Ft in the fermenter (4) due to supply of oxygen-containing gas at a temperature much lower than the internal temperature can be avoided, and
The foul-smelling gas contained in the exhaust gas is trapped in the water that comes into contact with the exhaust gas after preheating, so the amount of water evaporated during exhaust gas treatment can be suppressed and deodorized, eliminating the problem of environmental deterioration. However, the water after the exhaust gas is effectively used and supplied to the fermenter (4) to avoid water shortage in the fermenter (4), suppress the decline in the activity of aerobic bacteria, and improve fermentation processing efficiency. Overall, combined with the above-mentioned suppression of evaporation of exhaust gas treatment water, water resources can be saved, and the water after exhaust gas treatment can be sterilized. & If treatment is required, reduce the amount of water to be treated. By simplifying the equipment and reducing the amount of chemicals used, it has become possible to improve fermentation processing efficiency extremely economically.

[Brief explanation of drawings]

The drawing is a 70-sheet illustrating an embodiment of the method for composting ungenerated IJ. (4)...Fermentation tank.

Claims (1)

[Claims] A method for composting organic waste collection, which comprises mixing the organic waste collection with a fermentation product and then treating it in an aerobic fermentation tank (4),
The oxygen-containing gas supplied to the fermenter (4) is preheated 18111L by the exhaust gas from the fermenter (4), the preheated exhaust gas is brought into contact with water and deodorized, and a portion of the water after the exhaust gas treatment is A method for composting organic waste, characterized in that it is supplied to the fermentation tank (4).