JPH1179873A - Odorless fermentation treatment of miscellaneous drainage and sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently carry out nonpollution treatment of drain, sludge, human feces, urine, etc., of an end treating station and to recycle the treated material as a useful organic fertilizer, by subjecting them to odorless fermentation treatment. SOLUTION: A mixed water content adjusting material such as coffee grounds, sawdust, rice bran, straw, etc., are previously fermented in a different tank and fermented at about 50 deg.C to give a water content adjusting material, which is added to a fermenter. Miscellaneous drains, starch pulp, sludge, human feces, urine, etc., are sprayed on the water content adjusting material and stirred until a water content reaches about 60% liable to perform fermentation. Spraying, stirring and aeration are repeated and a high fermentation temperature of about 80 deg.C is maintained to evaporate water. Odorless fermentation is carried out for 2-3 months to give an organic fertilizer subjected to nonpollution treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an odorless fermentation treatment method for sludge, starch lees, miscellaneous wastewater, human manure, and the like in a final sediment in a terminal treatment plant having a large amount of water, and an organic fertilizer produced by the treatment method.

[0002]

2. Description of the Related Art Conventionally, sludge, starch lees, miscellaneous wastewater, human excreta and the like in a final treatment plant are sometimes treated by large-scale treatment facilities or, in some cases, by ocean dumping, resulting in problems such as urban problems and environmental problems. I have a difficult problem.

[0003]

However, in the case of the above-mentioned wastewater treatment plants, sludge, starch lees, miscellaneous wastewater, human manure, etc., which are discharged in large quantities, will be difficult to set up new disposal sites in the future and the ban on marine dumping will be banned. Losing the destination is visibly evident, and there is no doubt that illegal disposal will lead to various forms of disposal, such as environmental pollution.

The present invention has been made to solve the above problems, and adjusts the moisture content of terminally treated sludge, starch cake, miscellaneous wastewater, human manure, etc., and makes it odorless due to the continuous high temperature of 80 ° C. due to the heat generated by aerobic fermentative bacteria. It is intended to be converted into organic fertilizer and naturally reduced for effective use.

[0005]

The terminal sludge, starch lees, miscellaneous wastewater and human excreta are all substances having a high water content, and contain water exceeding a water content suitable for fermentation. This is mixed and stirred with a water conditioning material to adjust the water content to about 60%, which is the most easily fermented, and fermented in the presence of aerobic fermentation bacteria. Replenishing and stirring sludge, starch lees, miscellaneous wastewater and human excrement repeatedly at high temperature fermentation while maintaining the temperature in the range up to ℃. To maintain high temperature fermentation. As described above, the present invention is characterized in that high-temperature fermentation is sustained and a fermentation product is taken out after sufficient fermentation and maturation, and the taken out fermentation product becomes a useful organic fertilizer.

[0006] Terminal sludge, starch lees, miscellaneous wastewater, and human manure contain a high water content of about 60 to 90%. on the other hand,
As a moisture adjusting material, a material having a moisture content of about 20 to 30%, such as coffee grounds, sawdust, wood chips, rice husks, straw, and weeds, having a low water percentage is used.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In a fermenter, a mixture of coffee grounds, sawdust, weeds, straw, rice hulls and the like is put as a moisture adjusting material. The water content of the mixture is about 30%,
Pre-fermented at ~ 50 ° C. Spray sludge, starch lees, miscellaneous wastewater, human manure, etc., containing a large amount of water with a water content of about 60-90% from above, so that the water content is about 60%, which is most easily fermented by stirring. Adjust moisture.
When the water content is 50% or less, or 70% or more, a decrease in the fermentation temperature is observed. In the case where sediment sludge, starch lees, miscellaneous wastewater, or human manure containing a large amount of water is used in the terminal treatment plant, a water conditioner may be newly added. Fermentation by stirring in the presence of aerobic fermenters, fermentation temperature,
The temperature reaches about 65 ° C. in about 8 to 18 hours after the start of the fermentation operation.

[0008] Since the water content evaporates and decreases as the high temperature fermentation state continues for a long time, the fermentation temperature is set to about 65 ° C.
Sludge, starch lees and miscellaneous wastewater are continuously or intermittently replenished and sprayed, paying attention not to decrease below, and fermented while continuing stirring. In addition, aeration can be performed as needed to promote high-temperature fermentation and to evaporate a large amount of water. The fermentation period is about 60 to 90 days. Although it cannot be specified because it differs depending on the mass of the moisture control material such as sludge, starch residue, miscellaneous wastewater, human manure, etc., the fermentation temperature gradually decreases. Waiting for the temperature to drop to about 40 ° C., transfer to a separate tank, and turn it back two or three times to evaporate excess heat and release heat to obtain fermented organic fertilizer. The obtained organic fertilizer is composed of an organic component in sludge, starch lees, miscellaneous wastewater, human feces and urine, and a plant fiber component of a moisture regulator, and is excellent as a good soil conditioner in addition to fertilizer.

In a concrete fermenter of 1.5 m depth, 3 m width and 5 m length, fermentation materials of ³ m ³ of coffee grounds, 5 m ³ of sawdust, 1 m ³ of rice bran and 1 m ³ of straw are mixed and stirred in advance.
About 300 kg of a mixture of the terminally treated sludge, starch lees, miscellaneous wastewater and human manure (water content of this mixture was about 80%) containing the preliminarily fermented product was sprayed thereon. I felt that there was a shortage of water, so I added about 100 kg of miscellaneous wastewater and mixed with a shovel loader. Aeration was started when the water content reached about 60%. After about 15 hours, the fermentation temperature had reached 65 ° C. By about 20 hours, the temperature had reached 75 ° C. However, by about 24 hours, the water had evaporated due to the high temperature and the water was in a shortage state.
At that time, sludge, starch lees, miscellaneous wastewater, human excreta were again
An additional 0 kg was sprayed. In order to maintain the fermentation temperature at 65 ° C. or higher at all times, the same spraying, stirring, and aeration of wastewater were repeated for two months. Throughout the period, the amount of treated wastewater reached 3500 kg. When the fermentation temperature gradually began to fall and reached 40 ° C., the fermentation product was taken out and turned back three times in another place to produce an organic fertilizer.

[0010]

According to the method for treating sludge, miscellaneous wastewater, human manure, etc. of the present invention, in addition to the following practical advantages, environmental pollution due to discharge of wastewater, illegal dumping, etc. can be prevented. (1) By utilizing fermentation heat, water such as terminal sludge, starch cake, miscellaneous wastewater, human manure, etc., which is mostly composed of water, can be efficiently removed by evaporation, and there is no discharge of wastewater. In addition, energy consumption is small. Offensive odors that were difficult with conventional techniques can also be completely deodorized by the action of coffee grounds. Compared with a conventional wastewater treatment facility, the construction cost of the equipment may be about half or less. (2) The fermented product obtained has a high fertilizer component and is useful as a high-quality organic fertilizer.

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Claims (2)

[Claims] [Claim 1] Mixing coffee sludge, sawdust, rice bran, and straw and preliminarily fermenting with aerobic fermentation bacterium into final treatment plant sedimentation sludge, starch lees, miscellaneous wastewater, human manure, etc. An odorless fermentation treatment method characterized in that fermentation is adjusted to about 60% and fermentation is continued for about 2 to 3 months under an environment of fermentation heat of about 80 ° C. 2. An organic fertilizer produced by the fermentation treatment method according to claim 1.