JPH0410959Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention converts organic sludge and other organic water-containing substances generated in the treatment of organic wastewater such as sewage and human waste into solid fuel, and This invention relates to a device for converting organic hydrated sludge produced in the treatment of industrial wastewater into feed.

[Conventional technology]

Conventionally, organic hydrated materials such as organic sludge have been treated and disposed of by landfilling, incineration, etc.
In such cases, the actual situation is that a large amount of fuel and chemicals are input from outside the treatment and disposal system, and a large amount of money is spent to barely manage and dispose of the waste.

There are also attempts to effectively utilize organic sludge by dehydrating, drying, and turning it into fertilizer, but this also requires a large amount of fuel for drying, and the cost of turning it into fertilizer is higher than the revenue from selling it as fertilizer. This was an unattractive method that discouraged those who wanted to implement it.

[The problem that the idea attempts to solve]

As described above, in the conventional techniques, the treatment and disposal of organic hydrated substances is extremely troublesome and requires a large amount of expense, which is a problem, and there is a demand for the development of a technique that can solve these problems.

The present invention breaks away from the conventional concept of processing and disposing of organic hydrates, and
It can be converted into a solid fuel with a high calorific value and excellent combustibility, and can be effectively used for greenhouse horticulture, etc. It can also be used to rationally dry sludge generated from processing processes such as food processing wastewater and fermentation industrial wastewater. The purpose is to provide a device that can convert feed into livestock feed.

[Means to solve the problem]

The present invention uses an indirect heating screw press type dehydrator for dehydrating organic hydrated materials, and a system in which the dehydrated cake obtained by the screw press type dehydrator is brought into contact with hot oil supplied through an oil heating section. a contact tank,
a deoiling device for deoiling the hot oil suspension flowing out from the contact tank, and a pipe line for supplying steam generated from the contact tank to the screw press type dehydrator and the oil heating section. This is an organic water-containing substance processing apparatus characterized by the following features:

[Effect]

The water in the dehydrated cake is almost completely evaporated by contacting the dehydrated cake of organic water-containing material with hot oil, and the oil is separated to obtain solid fuel or dry feed, and at this time, the evaporated water from the dehydrated cake is further removed. Steam is used as a heating source for dehydrating organic hydrates and as a heating source for obtaining the hot oil.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. In the first illustrated example, 1 dehydrates organic sludge 2 by adding a dewatering aid 3, and removes separated water 4 to form a low-moisture product. This is a screw press type dehydrator for obtaining a dehydrated cake 5. 6 is a dehydrated cake 5 transported by a screw pump 7 such as a monopump, and hot oil (oil with a higher boiling point than water) heated by a heat exchanger 9 and supplied through a pipe 8.
It is a contact tank equipped with a closed type stirrer 10 for evaporating water in the dehydrated cake 5 by mixing and contacting the dehydrated cake 5 with a heavy oil or edible oil (preferably heavy oil or edible oil), and solids flowing out from the contact tank 6 are suspended. The hot oil suspension 11 is led to a deoiling device where oil and solid matter are separated. Oil machine 12
is used.

Further, a part of the steam 13 evaporated in the contact tank 6 is transferred to the screw press type dehydrator 1 through the pipe line 14.
It is used to improve the dewatering properties of the organic sludge 2, and in this case, the organic sludge 2 inside the screw press type dehydrator 1 is heated indirectly. An indirect heating type screw press type dehydrator is used in which steam 13 is introduced.

Furthermore, the other part of the steam 13 evaporated in the contact tank 6 is used as a heating source for a heat exchanger 9 that heats the oil supplied to the contact tank 6 via a pipe 14'.

Note that the oil 16 separated from the dry solids 15 is obtained in the deoiling machine 12, but the oil 16 is recovered and sent along with makeup oil 17 from the pipe 8 through the heat exchanger 9 as hot oil to the contact tank 6. Recycled.

In the figure, reference numeral 18 indicates a heater that heats the oil in the contact tank 6, and reference numeral 19 indicates condensed water of steam flowing out from the heat exchanger 9.

Therefore, the organic sludge is supplied to the screw press type dehydrator 1 after adding various dehydration aids 3 such as cationic polymers and pulp fibers,
The water is dehydrated while being indirectly heated by the steam 13 evaporated in the contact tank 6 led from the water to a moisture content of 50 to 60
The result is a dehydrated cake with a low moisture content of 5%.

Next, the dehydrated cake 5 is transferred to the screw pump 7.
The water in the dehydrated cake 5 is heated and evaporated when the cake is stirred and mixed with hot oil at a temperature of about 100 to 150°C supplied via a heat exchanger 9 and brought into contact for about 10 minutes. and almost completely eliminated. According to the experimental results, hot heavy oil with a temperature of 100~150℃ and moisture
When brought into contact with a 50-60% dehydrated cake 5, it is possible to easily obtain an oil-impregnated cake with a water content of about 10-15%, and the required contact time is determined by the particle size of the dehydrated cake 5. This was recognized. In addition, steam 13 evaporated from the dehydrated cake 5 in the contact tank 6
One part is led from the pipe line 14 to the screw press type dehydrator 1 and used for heating the organic sludge 2, and the other part is led from the pipe line 14' to the heat exchanger 9 to obtain hot oil. used as a heating source.

In this way, the sludge solids from which water has been almost completely removed are suspended in hot oil to form a slurry, and this hot oil suspension 11 is supplied to a deoiling machine 12 where it is highly deoiled to remove oil-containing components. 7 to 10% and moisture content of 8 to 12%, it becomes a dry solid 15 containing oil with a high calorific value of about 4000 kca/kg cake and good ignitability, and solid fuel is produced. Further, the oil 16 separated at this time is also heated in a heat exchanger 9 via a pipe line 8, and then recycled to the contact tank 6 and reused.

Note that the temperature of the oil 16 recovered by the deoiler 12 is lower than the temperature of the hot oil present in the contact tank 6, so the steam 13 is removed in the heat exchanger 9.
However, the steam condensate 19 flowing out from the heat exchanger 9 still has a temperature of 90-95
℃, so it is used to heat the organic sludge 2 supplied to the screw press type dehydrator 1 (the higher the temperature of the sludge, the lower the viscosity, making it easier to dewater), and improve the dewatering effect. It can be useful.

In the embodiment described above, only the mechanical deoiler 12 is used as the deoiler, but the deoiler can be a combination of a settling tank and a deoiler. For example, as shown in the second illustrated example, the hot oil suspension 11 flowing out from the contact tank 6 is guided to the settling tank 20, and the concentrated sludge 2 obtained by gravity settling is
It is also a preferred embodiment to further deoil the oil in the deoiler 12 using the deoiler 12. In this case, since the steam 13 also evaporates from the settling tank 20, this steam 13 is also used as a heating source for the screw press type dehydrator 1 or the heat exchanger 9, and the oil 16 is overflowed from the settling tank 20. However, this oil 16 is also collected and recycled as hot oil from the pipe line 8 to the contact tank 6.

The above is an example of turning organic sludge into solid fuel, but the target is sludge that does not contain toxic substances such as heavy metals and toxic organic compounds, such as food processing wastewater and fermentation industrial wastewater. In this case, by using edible oil as the hot oil, it is possible to produce edible oil-containing feed using the same equipment as in each of the above embodiments. Even if pathogenic bacteria are present in the sludge, there is no concern because they are heat sterilized by contact with hot oil, and a hygienically safe feed can be produced.

[Effect of idea]

As mentioned above, in this invention, an indirect heating type screw press type dehydrator is installed in the front stage of the contact tank with hot oil, and a deoiling device is installed in the rear stage, and the steam generated in the contact tank is transferred to the front stage screw press type dehydrator. Due to the unique structure of effectively utilizing the heating source for the type dehydrator and the heating source for obtaining hot oil, the following extremely useful effects are produced.

In the past, organic hydrated materials were wastefully disposed of in landfills or incinerated at great expense.
It can be converted into oil-containing solid fuel with low moisture content and high calorific value in a rational and energy-saving manner, and can be effectively used as a fuel for greenhouse horticulture and various other industries.

Depending on the type of organic hydrate, the organic hydrate can be converted into feed rich in protein and fat by using edible oil as the hot oil.

The steam generated from the contact tank between the dehydrated cake and hot oil is used as the heating source for the indirect heating type screw press type dehydrator and as the heating source for obtaining hot oil, so organic hydrates can be dehydrated in an energy-saving manner. can be dried and converted into solid fuel or feed.

[Brief explanation of drawings]

FIG. 1 is a structural explanatory diagram showing one embodiment of the present invention, and FIG. 2 is a structural explanatory diagram showing another embodiment of the present invention. 1... Screw press type dehydrator, 2... Organic sludge, 3... Dehydration aid, 4... Separated water, 5...
Dehydrated cake, 6... Contact tank, 7... Screw pump, 8... Piping, 9... Heat exchanger, 10... Stirrer, 11... Hot oil suspension, 12... Oil removal machine ,1
3...Steam, 14,14'...Pipe line, 15...
... Dry solids, 16 ... Oil, 17 ... Supply oil, 1
8... Heater, 19... Condensed water, 20... Sedimentation tank, 21... Concentrated sludge.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An indirect heating type screw press type dehydrator for dehydrating organic hydrous materials, and the dehydrated cake obtained by the screw press type dehydrator and supplied through an oil heating section. A contact tank is provided to bring the hot oil into contact with the heated oil, and a deoiling device is provided to remove oil from the hot oil suspension flowing out from the contact tank, and the steam generated from the contact tank is removed from the screw press type dewatering device. 1. An apparatus for treating organic water-containing substances, characterized in that a pipe line for supplying the oil heating section to the oil heating section is provided. (2) The organic water-containing material treatment apparatus according to claim 1, wherein the oil removal apparatus comprises a settling tank and an oil removal machine.