JP2000211908A - Carbonized raw sewage residue and production of organic fertilizer utilizing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a malodor from a composted fertilizer and effectively utilize a raw sewage residue by dehydrating the raw sewage residue removed from raw sewage and sewage, then carbonizing the dehydrated raw sewage residue, mixing the carbonized raw sewage residue with a sludge after fermentation, adding water thereto and heat-treating the resultant mixture. SOLUTION: A carbonized raw sewage residue is obtained by dehydrating a raw sewage residue removed from raw sewage and sewage to about 60% W.B. moisture content, charging the dehydrated raw sewage residue into a carbonizing furnace and carbonizing the dehydrated raw sewage residue. The resultant carbonized raw sewage residue is then charged into a heat-treating tank and mixed with a sludge after fermentation generated in a raw sewage treatment plant and a sewage treatment plant. Water or steam is further added to carry out a heat treatment. The carbonized raw sewage residue is utilized as a deodorizer for removing a malodor from an organic fertilizer prepared by subjecting sewage sludge to a fermentation treatment and composting the sewage sludge subjected to the fermentation treatment. The dehydrated sludge subjected to moisture regulation to about 40-60% W.B. moisture content suitable for fermentation and then subjected to the fermentation treatment is used. Microorganisms in the sludge can efficiently be killed by adding the carbonized raw sewage and water to a primarily fermented sludge and heat-treating the resultant mixture and a malodorous gas dissolved in water can rapidly be vaporized and removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the effective use of sewage generated in human waste treatment plants and sewage treatment plants,
The present invention relates to charcoal residue obtained by carbonizing the same and a method for producing an organic fertilizer using the same.

[0002]

2. Description of the Related Art In human waste treatment plants and sewage treatment plants, sediments (suspended contaminants, etc.) are removed from human waste and sewage by screens and the like.
Surplus sludge is generated in the process of water treatment. The residue is simply disposed of by landfill or incineration,
Its effective use has not been made at all. In addition, surplus sludge has been tried to be composted and used as an organic fertilizer, but the compost product has a bad smell such as an ammonia smell, which hinders use.

[0003]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to achieve an effective use of sewage, and an organic fertilizer obtained by fermenting excess sludge and composting the waste. To provide a method for producing an organic fertilizer from which malodor has been removed.

[0004]

The means for solving the problems described in claim 1 is characterized in that the residue removed from human waste and sewage is dehydrated and then carbonized to form a residue carbonized material. As a result, the residue which has been simply discarded in the past can be used as a soil conditioner, a deodorant and the like.

Means for solving the problem described in claim 2 is a method for producing an organic fertilizer in which surplus sludge generated in a night soil treatment plant and a sewage treatment plant is fermented and composted. It is characterized by mixing and further adding water or steam to heat treatment. by this,
The odor can be removed from the composted organic fertilizer by fermenting the excess sludge, and the residue can be effectively used.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a flow sheet showing an embodiment of the present invention. Reference numeral 1 denotes a carbonization furnace for carbonizing the residue. Reference numeral 2 denotes a fermenter for fermenting dewatered sludge. Reference numeral 3 denotes a heat treatment tank having a heating mechanism for further heating after adding water or steam to the fermented sludge and the carbonized residue. Water 60% W.
B. The residue that has been dehydrated to a certain extent is put into the carbonization furnace 1 and carbonized. The carbonized product of the residue has a low apparent density and a porous property as compared with the carbonized product of the sludge, and thus has excellent adsorption capacity, water retention capacity, and the like. As a result, the waste which has been conventionally incinerated to produce new waste called incinerated ash is carbonized, so that it can be used as a deodorant, a soil conditioner, or the like. At this time, a part of the dewatered sludge may be dried and carbonized together with the residue. The obtained carbide is put into the heat treatment tank 3 and used as a deodorant for removing the malodor of the compost product obtained by fermenting the dehydrated sludge.

[0007] The dewatered sludge is mixed with a water regulating material by 40 to 60% W.W. B. After the water content is adjusted, it is put into the fermentation tank 2 and fermented. As the moisture adjusting material, sawdust powder or the like is generally used. However, since the size of the apparatus is increased and the cost is increased, it is desirable to dry and use a part of the dewatered sludge. The fermentation performed in the fermenter 2 is an aerobic fermentation, and the level of the fermentation is performed up to the stage of the primary fermentation in which easily decomposable organic substances are mainly decomposed. The compost product subjected to the primary fermentation treatment has an unpleasant odor. For example, in the case of primary fermentation using night soil sludge as a raw material, an ammonia odor or the like remains strongly, which hinders its utilization.

Next, the fermented sludge is put into the heat treatment tank 3. Although the heat treatment tank 3 has a jacket that can be heated with hot water or steam and can be almost sealed, it may be heated with an electric heater or the like. The fermented sludge, charcoal residue, water or steam is introduced into the heat treatment tank 3 and heated from the jacket for heat treatment. The amount of water or steam to be added depends on the water content of the fermented compost is 40 to 60% W. B. The heating temperature is desirably about 80 to 120 ° C. The water content is 40-60% W. B. The degree is to increase the thermal conductivity, to efficiently kill the microorganisms in the compost product, and to set the heating temperature to about 80 to 120 ° C, to kill the microorganisms in the compost product, This is because the odorous gas dissolved in the water is quickly vaporized. The amount of the charcoal residue added to the fermented sludge is 1/5 of the solid content of the fermented compost product by weight.
It is desirable that this is the case. If the addition amount is 1/5 or less, there is a possibility that the odor may be insufficient to adsorb the odor. Further, if the heat treatment tank 4 is ventilated for a certain period of time after the heat treatment, the odor gas not adsorbed by the carbide can be discharged to the outside of the system. it can.

The mechanism of the odor removal according to the present invention is considered as follows. In the sludge after the primary fermentation, certain microorganisms are active to generate odor gas, and the odor gas dissolved in the water in the sludge is vaporized to generate odor. Therefore, there is a limit to the removal of offensive odors simply by adding a carbide. Therefore, in the present invention, the sludge subjected to primary fermentation is subjected to heat treatment by adding charcoal residue and water or steam. Heat is added after increasing the water content of organic waste by adding water or water vapor, so heat conduction is good, so microorganisms in sludge are efficiently killed and generation of odorous gas is stopped, and The dissolved odorous gas can be quickly vaporized. If it is adsorbed and removed by the added charcoal and then aerated, the odorous gas can be removed out of the system, so that the odor can be reliably removed from the fermented sludge and the organic fertilizer as a product. Moisture adjustment can also be performed.

[0010]

EXAMPLE The sewage from a human waste treatment plant was treated to a water content of about 60% W. B. After being dehydrated, it is put into the carbonization furnace 1 and the exhaust temperature is reduced to about 50
Carbonization was performed while controlling to 0 ° C. The carbonized residue obtained had a burning loss of 50% and an apparent density of about 150 kg / cubic meter. This was put into the heat treatment tank 3 together with the primary fermented night soil sludge in the fermentation tank 2, and the water content was 40% W.
B. Water was added until the temperature reached approximately, and steam at 120 ° C. was introduced into the jacket of the heat treatment tank 3 to perform a heat treatment for about 18 hours, followed by ventilation and cooling. The resulting product was completely odorless.

[0011]

The present invention relates to the effective use of sewage generated in a human waste treatment plant and a sewage treatment plant, and relates to a carbonized sewage obtained by carbonizing the same and a method for producing an organic fertilizer using the same. That is, carbonized sewage generated in a night soil treatment plant and a sewage treatment plant is obtained to obtain carbonized residue. It is characterized by producing fertilizer. As a result, new waste called incineration ash has been generated by conventional incineration, and the residue can be carbonized to be used as valuables such as deodorants and soil conditioners. Organic fertilizers made from sludge can be made odorless.

[0012]

[Brief description of the drawings]

FIG. 1 is a flow sheet showing an embodiment of the present invention.

[Explanation of symbols]

 1 carbonization furnace 2 fermentation tank 3 heat treatment tank

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI theme coat ゛ (reference) C10B 53/00 B09B 3/00 303H 4H061 F term (reference) 4D004 AA02 BA02 BA04 BA06 CA19 CA26 CB06 CB50 CC02 CC03 CC08 DA02 DA03 DA06 DA09 4D059 AA01 AA05 BA01 BB05 BK02 CA16 CC01 DA70 EB10 4G046 CA00 CB08 CC10 4H012 HA01 4H026 AA01 AB04 4H061 AA02 CC51 DD20 EE01 EE02 GG18 GG49 HH42

Claims (2)

[Claims] 1. A charcoal residue obtained by dewatering and carbonizing the residue removed from human waste and sewage. 2. A method for producing an organic fertilizer in which surplus sludge generated in a human waste treatment plant and a sewage treatment plant is fermented to be composted, wherein charcoal residue is mixed with the fermented sludge, and water or steam is further added. A method for producing an organic fertilizer, comprising heat-treating.