JP2005313119A - Quick lime reaction conditioning agent, method for treating high water content organic matter using the agent and method for treating dry organic matter using the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reaction conditioning agent that enables easy control of reaction, requires no special apparatuses, and can efficiently convert high water content organic matters into organic slaked lime or inorganic slaked lime, a method for treating high water content organic matters, which enables efficient conversion of high water content organic matters into organic slaked lime or inorganic slaked lime, which are useful fertilizers, and a method for treating organic matters containing elements harmful against animals and plants using the method. <P>SOLUTION: The quick lime reaction conditioning agent comprises a mixture of an water-soluble organic matter of 10 wt.% or more and water of 90 wt.% or less. The method for treating higher water content organic matters comprises the steps of mixing and agitating high water content organic matters with the above reaction conditioning agent, immediately adding quick lime (30 to 300 parts) to the mixture, and then agitating and mixing the mixture. The method for treating dry organic matters comprises the steps of immediately adding 30 to 300 parts by weight of quick lime to the mixture containing high water content organic matters and the above reaction conditioning agent, agitating the mixture, adjusting the temperature of the mixture at 300 to 580°C, introducing dry organic matters into the mixture, and thus treating the dry organic matters without causing environmental destruction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a reaction regulator that adjusts the reaction between quicklime and water, and a method for treating organic waste using a reaction using the regulator, and in particular, animal and plant residues, (dehydrated) sludge, filtration residues, waste cutting Harmful to animals and plants, such as oil, washing waste liquids, and other methods that can handle high-moisture animals and plants organic matter in a short time without worrying about environmental pollution, and organic halides that use this treatment method The present invention relates to a method for treating dry organic matter containing various elements.

  Conventionally, landfill processing, incineration processing, composting processing, and the like have been performed on high-moisture animal and plant organic matter, and incineration processing has been mainly performed on low-moisture waste. In particular, waste with high water content is mainly incinerated or composted after drying because there is no appropriate treatment facility other than garbage processing machines using microorganisms, but both require large-scale equipment. In addition, since various procedures related to installation of equipment are complicated and time consuming, it is difficult to process it at a high water content organic matter generating establishment. Therefore, many companies with high water content organic matter discharges often have to ask outside to dispose of them as waste, which is a major issue for establishments aiming for zero emissions.

  As one of the composting methods that hardly cause environmental pollution among the above-mentioned treatments, there is known a method of adding quick lime and stirring to dry organic matter. In this case, the temperature of the reaction system rapidly rises in a short time due to the heat of hydration reaction of quicklime, and when it reaches 100 ° C., it becomes a boiling state, and water vapor and slaked lime powder are ejected. However, there is a drawback that the quick lime is gradually added or the surface of the quick lime has to be coated with an oil or the like, resulting in poor workability and high cost. Moreover, since the reaction heat is often taken away by water vapor, the temperature at the top of the reaction system does not exceed 105 ° C., and the temperature at the bottom does not exceed 200 ° C., so that the processing rate of organic matter is not sufficient. was there.

  These disadvantages have been improved by using a treatment mainly composed of calcium oxide and sodium silicate. In this case, however, a separate deodorizing device is required, or an ammonia ion absorbent is added separately. In addition, there is a drawback that the reaction system becomes complicated, for example, it is necessary to substantially coat the surface of quicklime with fats and oils (for example, Patent Documents 1 to 4).

JP-A-5-23699 JP-A-7-185034 JP-A-8-24900 Japanese Patent Laid-Open No. 11-76988

  As a result of intensive studies to solve the above-mentioned drawbacks, the present inventors have found that a mixture containing a water-soluble organic substance and water and, if necessary, further a water-soluble inorganic substance, extremely effectively suppresses the reaction between quick lime and water. Nevertheless, when quick lime is added to a highly water-containing organic substance to which this reaction modifier is added, the reaction system boils due to the synergistic effect of the heat of hydration reaction of quick lime and the heat of decomposition reaction of organic matter. The inventors have found that the internal temperature can be increased to about 580 ° C. without causing the present invention to arrive at the present invention.

Accordingly, a first object of the present invention is to provide a quicklime reaction regulator capable of efficiently adjusting the reaction between quicklime and water.
The second object of the present invention is that it is easy to control the reaction and does not require a special device, and is capable of converting high water content organic matter such as dehydrated sludge into organic slaked lime which is an efficient and useful fertilizer. It is providing the processing method of a water-containing organic substance.
The third object of the present invention is to provide a method for treating a highly water-containing organic substance, which can easily convert the highly water-containing organic substance into inorganic slaked lime useful as a soil modifier.
A fourth object of the present invention is to provide a method for treating a dry organic substance, which can easily treat an organic substance containing an element harmful to animals and plants without causing environmental pollution.

The above-mentioned objects of the present invention are a reaction regulator having a function of regulating an exothermic reaction with quicklime and water, wherein the reaction regulator is a mixture of 10% by weight or more of a water-soluble organic substance and 90% by weight or less of water. Quick lime reaction regulator characterized by comprising, high water content organic matter and the quick lime reaction regulator are mixed and stirred, and then 30 to 300 parts by weight of quick lime is quickly added and stirred and mixed. And a dry organic matter treatment method characterized by introducing the dry organic matter into a reaction mixture at 300 to 580 ° C. and treating the organic matter without causing environmental destruction.
The water-soluble organic substance is preferably at least one selected from the group consisting of ketones, ethers, carboxylic acids, alcohols, amines, amino acids, surfactants and saccharides. Further, a water-soluble inorganic salt may be further contained.
When processing a high water content organic substance, by adding quick lime so that reaction internal temperature may be 190 degrees C or less, organic slaked lime effective as a fertilizer and a soil modifier is obtained, and reaction internal temperature is 300- By adding quick lime so that it may become 580 degreeC, a high quality inorganic slaked lime can be obtained. In this case, if a harmful substance such as a halogenated hydrocarbon is introduced into a slaked lime bath having an internal temperature of 300 ° C. or higher, the harmful substance can be treated without causing environmental destruction.

  Although the reaction modifier of the present invention is very simple, the reaction system can efficiently inhibit the reaction of quick lime and water even if quick lime is quickly added to the reaction system later. It is particularly suitable for quick lime treatment of hydrous organic waste. In addition, the method for treating hydrous organic matter of the present invention treats highly hydrous organic waste quickly and economically without polluting the surrounding environment, and at the same time, produces high-quality organic slaked lime or inorganic slaked lime. be able to. Furthermore, since processing can be performed with a simple apparatus, the apparatus can be made compact, and the apparatus can be installed in a vehicle or the like to provide a processing apparatus having excellent transportability, workability, and operability.

  Water-soluble organic substances used in the reaction modifier of the present invention include water-soluble ethers such as ketones and glycol ethers, carboxylic acids, methanol and ethanol, polyhydric alcohols such as glycerin and alcohols containing amino alcohol, amines Can be appropriately selected from among amino acids, amino acids, surfactants and saccharides. These may be used alone or in combination of two or more. In addition, the concentration of the water-soluble organic substance is not particularly limited, and can be appropriately set according to the use situation. For example, if the water content of the organic substance to be treated is high, the concentration of the water-soluble organic substance may be close to 100%, and if the water content of the organic substance is low, the concentration of the water-soluble organic substance in the reaction modifier is 10% or less. But it ’s okay. From the viewpoint of workability for addition, it is preferably about 15 to 70%. The surfactant may be any of a nonionic surfactant, an anionic surfactant, and a cationic surfactant.

The water-soluble inorganic substance used in the reaction modifier of the present invention can be appropriately selected from hydroxides, sulfates, carbonates and silicates. These may be used alone or in combination of two or more.
Moreover, there is no restriction | limiting in particular in the addition amount, It can determine suitably considering the quality etc. of organic slaked lime and inorganic slaked lime which are final products.

  The high water content organic matter in the present invention is a concept including a watery animal or plant organic matter usually having a water content of 80% by weight or more, such as wastewater treatment sludge, animal and plant residues, shochu waste liquid, disposal drinking water, etc. You may adjust the water | moisture content contained suitably by means, such as filtration, as needed. In the present invention, it is not impossible to use a low water content organic substance, and it can be used so as to contain water higher than the water content of natural animals and plants as a whole.

  In the method for treating high water content organic matter and the method for treating dry organic matter of the present invention, a reaction modifier is appropriately used in consideration of the type and water content of the high water content organic material. It is preferable to adjust the type and concentration of the reaction modifier so that the amount of the reaction modifier used is 0.1 to 20 parts by weight. In order to reduce the processing cost, it is preferable to suppress the amount of reaction modifier used as much as possible. The amount of the minimum reaction modifier to be used varies depending on the type and moisture content of the high water content organic substance to be treated, and the type and concentration of the water soluble organic substance and water soluble inorganic substance in the treatment agent. It can be easily determined by carrying out a model experiment such as adding a certain amount of quicklime to the workpiece to which various reaction modifiers are added and measuring the reaction start time in each case.

  The quicklime used in the present invention is not particularly limited and is not particularly required to have a high purity. However, the higher the purity, the higher the reaction efficiency. Therefore, use an appropriate one in consideration of cost. It ’s fine. The particle size is not particularly limited as long as the reactants can be made uniform, and the particle size distribution need not be particularly uniform. Any of powder, granular and gravel can be used, but granular quicklime or quicklime powder usually used industrially can be used as it is. The amount of use is 30 to 300 parts by weight with respect to 100 parts by weight of the water-containing organic matter, but it is charged quickly within a short time. When the internal temperature of the reaction is 300 to 580 ° C., it is preferably 40 to 300 parts by weight. Whether the internal temperature of the reaction is 190 ° C. or lower or 300 to 580 ° C. depends on the calorific value of the reaction heat of quicklime and water and the subsequent combustion reaction of the organic matter, so the ultimate temperature of the reaction mixture is It depends not only on the amount ratio of moisture and quicklime to be used, but also on the amount of organic matter contained in the water-containing organic matter and the method of adding quicklime.

  In the method of the present invention, when obtaining organic slaked lime useful as a fertilizer, the amount of quick lime added is adjusted so that the temperature after mixing is 190 ° C. or lower, and inorganic slaked lime with excellent soil reforming properties is obtained. When doing, the addition amount of quicklime is adjusted so that the temperature after mixing may be 300-580 degreeC. In the method of the present invention, since the temperature of the reaction system can be made sufficiently high, the generation of ammonia, amines and the like is hardly observed and there is no off-flavor.

Next, a specific method for treating a high water content organic substance according to the present invention will be described below. Although the case where the reaction tank with a stirrer is used as a specific example is demonstrated, this invention is not limited to this.
First, in a reaction tank equipped with a stirrer, both of them are charged so that the reaction modifier is 0.1 to 10 parts by weight with respect to 100 parts by weight of the high water content organic substance, and stirred and mixed. Next, 30 to 300 parts by weight of quicklime is added and stirred and mixed. When the mixture becomes substantially uniform, the stirrer is stopped. In this case, quicklime is added quickly at once. When the evaporation of water vapor is no longer observed from the surface of the reaction product, the stirrer is slowly rotated at a low speed so that no unreacted product remains.

  In the treatment method of the present invention, the reaction between quick lime and water becomes slow due to the presence of the reaction modifier, so that the steam and slaked lime powder do not explode and the generation of steam and entrained slaked lime powder is slight. Therefore, as a countermeasure for exhaust gas, a simple device such as a scrubber can be used, so that the equipment cost can be kept lower than before.

  After confirming that there is no unreacted substance, the stirrer is stopped, the reaction system is cooled, and then organic slaked lime or inorganic slaked lime produced by the reaction is taken out. The composition of the organic slaked lime obtained when the reaction temperature is 190 ° C. or lower consists of slaked lime, ash, a hardly decomposable organic substance, and moisture. Since the persistent organic matter remains as it is, it can be used as a fertilizer component.

  In order to obtain inorganic slaked lime useful as a soil modifier, both are charged in a reaction tank equipped with a stirrer so that the reaction modifier is 0.1 to 10 parts by weight with respect to 100 parts by weight of the high water content organic matter. -After mixing, quickly add 40-300 parts of quicklime and mix appropriately and stop the stirrer. When the evaporation of water vapor from the reaction product surface is almost not observed, the stirring is continued slowly and intermittently. During this time, the organic matter is gradually oxidatively decomposed, and finally inorganic slaked lime can be obtained.

  In the prior art, since the reaction between quick lime and water is fast, water vapor is often generated, and the reaction heat is taken away by the water vapor, so it was impossible to raise the temperature of the reaction system to 200 ° C. or higher. In contrast, in the present invention, since the reaction rate of quicklime can be suppressed by mixing a reaction regulator, the heat of hydration reaction in the initial stage of the reaction is used to raise the temperature of the reaction system, It is rarely used for evaporation of water. As a result, the reaction heat is accumulated in the quicklime reaction system and reaches the decomposition temperature of the organic matter, and the decomposition heat of the organic matter is added to further increase the temperature of the quicklime reaction system. When the generation of water vapor ceases, the temperature is maintained by the heat of decomposition of the organic matter.

  The temperature continues to rise due to the reaction heat of the oxidative decomposition of organic matter, and exceeds 400 ° C. In this specification, the reaction system maintained at 350 to 580 ° C. is referred to as “slaked lime bath”. The temperature of this “slaked lime bath” continues to maintain a high temperature of 350 to 580 ° C. as long as the organic matter is present, and the temperature gradually decreases when the organic matter is exhausted. Therefore, when the dried organic matter (hereinafter referred to as “dried organic matter”) or the aforementioned organic slaked lime is added to the slaked lime bath, the introduced organic matter is decomposed by oxidation, so that the temperature of the slaked lime bath is maintained at the above temperature. Organic matter is incinerated.

  Examples of the dry organic matter include halogenated hydrocarbons such as vinyl chloride, polyhalogenated organic matter, fluorine resins, PCBs, dioxins, compounds containing elements harmful to animals and plants such as various agricultural chemicals, and high heat resistant resins. be able to. For example, when a halogenated hydrocarbon is introduced, the halogen is fixed as calcium halide in the ashing process, so that environmental pollution does not occur. The finally obtained inorganic slaked lime consists of slaked lime and ash.

  The present invention can be applied to various uses. Major applications include, for example, the treatment of high water content waste discharged from activated sludge treatment facilities and other water treatment facilities, meat residues, wastes, sewage sludge, sediment sludge, manure sludge, various filtration residues, and other organic sludge. Treatment of blood, food processing residue and other animal and plant residues, disposal of foodstuffs, waste beverages, disposal of pharmaceuticals and waste materials, disposal of organic products, water-soluble cutting waste oil, wax washing waste liquid, various water washing waste liquids, etc. It is effective for the treatment of an aqueous solution that is difficult to treat by ordinary methods. In addition, organic slaked lime and inorganic slaked lime produced as by-products are both useful, and are zero-emission because they are completely recycled products that can be widely traded as paid products as they are.

  Although the treatment method of the present invention can be carried out with a large-scale facility, it can be easily carried out as long as it is an apparatus having at least a stirrer, so that the apparatus can be made extremely compact. Therefore, in the case of a business establishment with a small amount of emission, it is possible to bring in-vehicle mobile equipment directly to the discharge site and process it on site.

Next, although the processing method of this invention is further demonstrated according to a batch type flowchart (FIG. 1), this invention is not limited by this.
In the figure, reference numeral (1) is a high water content organic hopper and supply device, (2) is a reaction regulator hopper and supply device, (3) is a quicklime tank and supply device, (4) is a quicklime measuring tank, and (5) is A reaction device and slaked lime discharging device, (6) is a slaked lime storage bag, and (7) is a steam cleaning device (scrubber).

The high water content organic substance and the reaction conditioner charged in the high water content organic hopper (1) and the reaction conditioner hopper (2) are respectively a supply apparatus for the high water content organic hopper (1) and a supply apparatus for the reaction conditioner hopper (2). To the reactor (5). The quicklime stored in the quicklime tank (3) is supplied to the reactor (5) in an amount suitable for use through the quicklime measuring tank (4) by the supply device of the tank (3).
The water vapor generated by the reaction is released to the outside through the water vapor cleaning device (7). On the other hand, after completion | finish of reaction, the inorganic slaked lime or organic slaked lime of a reaction product is discharged | emitted by the slaked lime storage bag (6) by the slaked lime discharge | emission apparatus of a reaction apparatus (5).
As described above, the treatment method of the present invention can quickly and economically treat high-moisture waste without polluting the surrounding environment, and at the same time, can produce useful organic slaked lime or inorganic slaked lime. Quality is very good.

EXAMPLES Hereinafter, although this invention is explained in full detail based on an Example, this invention is not limited by this. However, “parts” represents “parts by weight” unless otherwise specified.
[Preparation of reaction modifier (I)]
A reaction regulator having the following composition was prepared and used in the examples.
Methanol 50.0% by weight,
Sodium hydroxide 12.5% by weight
37.5% by weight of water
[Preparation of reaction modifier (II)]
A reaction regulator having the following composition was prepared and used in the examples.
Methanol 50.0% by weight,
Anionic surfactant 12.5% by weight
Sodium hydroxide 12.5% by weight
Water 25.0% by weight

After 100 parts of activated sludge having a water content of 80% and 3 parts of the reaction modifier (I) are sufficiently stirred and mixed in the reaction apparatus, while stirring the mixture, 100% quick lime having a purity of 95% and 30 mesh or less. The whole amount was quickly added (within 1 minute addition time), and stirring was stopped.
Although the water vapor had evaporated after 1 minute from the addition of quicklime, the water vapor accompanied with the slaked lime powder did not erupt rapidly.

The temperature of the mixture surface gradually increased and reached 100 ° C. after 2 minutes. The amount of water vapor transpiration increased, and the temperature inside the apparatus reached the peak temperature (145 ° C.) after 5 minutes. Thereafter, the temperature gradually decreased and it was confirmed that the reaction was completed. When the reaction reached a peak, stirring was resumed at a speed of 30 rpm to homogenize the reaction.
After completion of the reaction, the white, smooth organic slaked lime produced was transferred from the reactor to a slaked lime bag and stored. The amount of organic slaked lime produced was 190 parts.
When the reaction modifier (II) was used instead of the reaction modifier (I), substantially the same results were obtained.

After thoroughly stirring and mixing 100 parts of activated sludge having a water content of 80% and 5 parts of reaction modifier in the reactor, the whole amount of 197 parts of quick lime with a purity of 95% and 30 mesh or less was quickly added while stirring the mixture. (Addition time within 1 minute)
After the quicklime was added, the mixture was stirred for about 1 minute, and the stirrer was stopped. During this time, a small amount of water vapor was observed, but no rapid ejection of water vapor with slaked lime powder occurred.

After the quicklime was added, the temperature of the mixture surface gradually increased, reached 100 ° C. after 2 minutes, and the generation of water vapor slightly increased. During this time, the heat of reaction was accumulated in the reactor without being taken away by the evaporation of water. After 3 minutes, the temperature in the apparatus was 200 ° C. After confirming that the water vapor was not evaporated, stirring of the reaction product was started at a stirring speed of 30 rpm.
After 7 minutes, it was confirmed that the internal temperature of the apparatus rose to 370 ° C. due to the heat of oxidative decomposition of organic matter, and a slaked lime bath was formed. After 20 minutes, the temperature of the slaked lime bath showed a peak temperature of 445 ° C., and after 70 minutes, the temperature began to gradually decrease, confirming that the decomposition of the organic matter was completed.

When a newspaper of 5 cm × 5 cm size was put into the slaked lime bath, the flame was raised and burned after several tens of seconds.
When 10 parts of organic slaked lime produced in the same manner as in Example 1 was added, the color changed from white to brown, and finally the color changed to gray, confirming the decomposition of the organic matter.
After completion of the treatment, gray, odorless inorganic slaked lime was transferred from the reactor to a slaked lime bag and stored. The amount of inorganic slaked lime produced was 277 parts.
When the reaction modifier (II) was used instead of the reaction modifier (I), substantially the same results were obtained.

  The present invention does not pollute the surrounding environment, it is difficult to treat high-moisture organic matter discharged from activated sludge treatment equipment and other water treatment equipment, animal and plant residue treatment, disposal organic product disposal, and other ordinary methods. In addition to being able to easily and inexpensively perform treatment of an aqueous solution, it is possible to produce useful organic slaked lime or inorganic slaked lime at the same time, which is extremely significant in industry.

It is a flowchart for implementing the method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High moisture organic substance hopper and supply apparatus 2 Reaction regulator hopper and supply apparatus 3 Quicklime tank and supply apparatus 4 Quicklime measuring tank 5 Reactor and slaked lime discharge apparatus 6 Slaked lime storage bag 7 Steam cleaning apparatus

Claims (12)

  A reaction regulator having a function of adjusting an exothermic reaction with quicklime and water, wherein the reaction regulator comprises a mixture of 10% by weight or more of a water-soluble organic substance and 90% by weight or less of water. Regulator.   The quicklime according to claim 1, wherein the water-soluble organic substance is at least one selected from the group consisting of ketones, ethers, carboxylic acids, alcohols, amines, amino acids, surfactants, and sugars. Reaction modifier.   The quicklime reaction modifier according to claim 2, wherein the ether is selected from glycol ether, and the alcohol is selected from methanol, ethanol, ethylene glycol, glycerin, and amino alcohol.   The quicklime reaction regulator according to any one of claims 1 to 3, further comprising a water-soluble inorganic substance, wherein the water-soluble organic substance in the regulator is 10 to 97% by weight, and the water-soluble inorganic substance is 30 to 1. The quicklime reaction regulator characterized by the weight% and water being 60 to 2% by weight.   The quicklime reaction regulator according to claim 4, wherein the water-soluble inorganic substance is at least one selected from the group consisting of hydroxides, sulfates, carbonates, and silicates.   A high water content organic substance characterized by mixing and stirring the quick lime reaction modifier according to any one of claims 1 to 5 and then quickly adding 30 to 300 parts by weight of quick lime and stirring and mixing. Processing method.   The treatment of high water content organic matter according to claim 6, wherein the addition ratio of quicklime is adjusted so that the temperature of the mixture becomes 190 ° C or lower, and the mixture is stirred and mixed to make the mixture into organic slaked lime. Method.   The processing method of the high water content organic substance described in Claim 6 which adjusts the addition ratio of quick lime so that the temperature of a mixture may be set to 300-580 degreeC, and stirs and mixes the said mixture into inorganic slaked lime.   The processing method of the high water content organic substance in any one of Claims 6-8 whose said high water content organic substance is a waste material.   Quick lime is mixed and stirred so that the temperature of the mixture becomes 300 to 580 ° C in the mixture containing the highly water-containing organic substance and the reaction regulator according to any one of claims 1 to 5, and the temperature of the mixture is set to 300 ° C. After having made it above, the dry organic substance processing method characterized by introduce | transducing dry organic substance in this mixture.   The method for treating a dry organic matter according to claim 10, wherein the dry organic matter contains an element harmful to animals and plants. The method for treating a dry organic matter according to claim 11, wherein the dry organic matter is mainly a halogenated hydrocarbon.