JPS6136472B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides a method for producing coal with microorganisms attached thereto;
In particular, when used in the activated sludge method, it is possible to treat high concentrations that were considered impossible to directly treat with conventional activated sludge methods.
This invention relates to a method for producing coal with microorganisms that facilitates direct treatment of BOD wastewater. The activated sludge method is said to be a wastewater treatment method suitable for treating wastewater with a high BOD concentration that contains a large amount of organic matter. However, the conventional activated sludge method has limitations in decomposition efficiency and substances to be decomposed. Removal rate 95%,
The processing capacity was only about 1Kg/m ² D of BOD load. Therefore, it is impossible to directly treat wastewater with a high BOD concentration of 3000 ppm or more.
When attempting to treat BOD wastewater using the conventional activated sludge method, the wastewater must first be diluted with water.
It was necessary to reduce the BOD concentration, which required extra processing costs. In addition, in the conventional activated sludge method, microorganisms, mainly protozoa, are used, and the seed sludge containing these microorganisms is usually one that is naturally generated in the aeration tank, or activated sludge from elsewhere. The sludge collected from the sludge method system is brought in and used, and seed sludge containing viable bacteria with a moisture content of less than 60% is not produced. Powdered seed sludge with a water content of 10 to 30% is also produced, but this is made by keeping bacteria in a state of suspended animation, and although this type of sludge has the advantage of being easy to handle, it is not suitable for the activated sludge method. Even when used as sludge,
Its treatment capacity is by no means improved compared to the conventional activated sludge method described above. The present invention provides a method for producing coal on which microorganisms have settled, which is a seed sludge that easily enables direct treatment of high-concentration BOD wastewater, which was considered impossible to directly treat using conventional activated sludge methods. This involves implanting a group of microorganisms, including alcohol-fermenting bacteria, onto specific coal using specific means. That is, the method for producing coal on which microorganisms have been implanted according to the present invention involves using coal (excluding peat or bituminous coal with a carbon content of 84% or more and anthracite), a large amount of protein such as rice sugar and oil cake, and a phosphorus-rich coal. , a nutrient source containing potash and water are blended so that the moisture content is 40 to 60%, and this blend is fermented to implant microorganisms including alcohol-fermenting bacteria on the coal. That is. To explain in detail the manufacturing method of the present invention having the above-mentioned characteristics, the coal used in the present invention includes:
Peat has low strength, and bituminous coal and anthracite coal with a carbon content of 84% or more are difficult for microorganisms to settle on, so these coal grains are not used, and cutlet coal and lignite are used. In addition, particles with a diameter exceeding 20 mm are usually not suitable for flowing in the aeration tank as they are, and microorganisms are difficult to settle in a short period of time.
It is convenient to use one with a diameter of 20 mm or less. The microorganism-attached coal obtained by the method of the present invention is
In particular, it is effective when used with a certain particle size distribution, so it is recommended that the coal used has a particle size distribution in the range of 0.2 mm to 20 mm. Particularly preferred is coal having a normal particle size distribution, for example, coal having a normal distribution in the particle size range of 2 mm to 10 mm. In addition, nutritional sources include foods that contain a large amount of protein and also phosphorus and potassium, such as rice sugar, barley sugar,
Oil cake is used. The inoculum to be used may be any microorganism group including alcohol-fermenting bacteria, and such inoculum is usually naturally contained in various nutritional sources, such as rice sugar and malt sugar. When carrying out this method, if such a nutrient source is used, there is no need to particularly incorporate a seed culture. Therefore, in carrying out the present invention, the above-mentioned coal and the above-mentioned nutrient source are blended, preferably 10 to 80 parts by weight of the latter to 100 parts by weight of the former, and at this time, the nutrient source is If it does not contain alcohol-fermenting bacteria, add a starter that contains alcohol-fermenting bacteria,
Water is added to this so that the moisture content of the blend is 40-60%, and the blend is maintained under conditions suitable for fermentation by alcohol-fermenting bacteria. That is, the center temperature of the above formulation is usually maintained at 50° ± 2°C;
Fermentation is continued for 7 to 10 days while replenishing water so that the water content does not fall below 40%, and the fermentation is completed. The end of fermentation is the point at which the apparently white mold invades the inside of the coal particles and begins to destroy the coal particles. The above-mentioned fermentation method may be carried out by natural fermentation in the open air, or may be carried out continuously in a factory by leaving a predetermined compound in a rotary kiln for 7 to 10 days. The microorganism-implanted coal obtained as described above can be used as it is as a seed sludge in the activated sludge method if coal having a predetermined particle size distribution is used, and it can also be used as a seed sludge in the activated sludge method. Those that do not have a particle size distribution may be used after being adjusted to a desired particle size distribution by pulverization, sieving, etc. Examples of the present invention and usage examples using coal on which microorganisms have settled according to the present invention will be shown below together with reference examples, and the effects of the coal according to the present invention as a seed sludge will be specifically explained. Example A mixture consisting of 3 kg of lignite having a substantially uniform particle size distribution in the range of 0.2 mm to 10 mm, 1 kg of rice sugar, and 1.5 kg of water was placed in a container at room temperature (20 to 35°C) to a concentration of 0.8 kg. ) Fill the bottom. Fermentation begins after 24 hours and water evaporates rapidly, so water is sprayed on the surface every day and stirred daily to maintain the temperature at the center of 50±2℃. The process was completed, and the desired coal with microorganisms implanted thereon was obtained. The end of the fermentation was defined as the time when the apparently white mold entered the inside of the coal grains and started destroying the grains. Example of use Miso brewing wastewater with BOD3000ppm,
Fishery processing wastewater with a BOD of 9000 ppm was treated under the conditions listed in Tables 1 and 2 below to obtain the treated water shown in Tables 1 and 2, respectively. Note that the reference example shows a case using the conventional activated sludge method.

【table】

【table】

[Table] As mentioned above, if the microorganisms obtained by the method of the present invention and which have settled on coal with microorganisms are used as seed sludge in the activated sludge method, they cannot be directly treated by conventional methods. It enables direct treatment of hot, high-concentration BOD wastewater, suppresses the generation of excess sludge, and can treat a high BOD load, effectively treating a large amount of wastewater per hour compared to conventional methods. The running cost of wastewater treatment can be greatly reduced, and the product has a moisture content of 40%.
% of solids, it has the advantage of being easy to transport and maintain, and the raw materials are inexpensive and manufacturing is relatively easy. Its contribution to the field of processing is extremely large.

Claims (1)

[Scope of Claims] 1. Coal (excluding peat or bituminous coal with a carbon content of 84% or more and anthracite), a nutrient source containing a large amount of protein such as rice sugar and oil cake, and containing phosphorus and potassium, and water. A method for producing coal on which microorganisms have been implanted, which comprises blending the above ingredients so that the moisture content is 40 to 60%, and fermenting this mixture to inject microorganisms containing alcohol-fermenting bacteria into the coal. 2. The method for producing coal implanted with microorganisms according to claim 1, wherein the nutrient source contains a group of microorganisms including alcohol-fermenting bacteria. 3. Claim 1 of supplying water during fermentation
A method for producing coal on which microorganisms have been implanted as described in 2. 4 For 100 parts by weight of the above coal, 10 to 10 parts of the above nutrients
A method for producing coal on which microorganisms have been implanted according to claim 1, which comprises blending 80 parts by weight.