JPS60103215A - Disposal of waste - Google Patents

Abstract

PURPOSE:To utilize effectively necessary energy and enable to perform the consistent disposal of intermediate product by a method wherein the natural state waste containing an organic matter is processed by a fusing disposal simultaneously by burning or dry distillation. CONSTITUTION:The natural state waste containing an organic matter is granulated to the size of 1-3mm. in diameter, then introduced through introducing port 2. Meanwhile, the air or the air added by oxygen is supplied with supplying speed, for instance, 40-60m/s through an air supplying port 3. Inside of a furnace 1 is kept at 600-800 deg.C in temperature with an auxiliary burner 4, then the waste 9 is moved with an air flow, introduced into a disposal furnace, turned round at the upper part in the furnace. Thus, the waste 9 is burnt with turning movement, ash produced by the burning is dropped on a melted matter 7. In case that oxygen content is unsatisfied, the waste 9 is processed by the dry distillation instead of burning. The melted matter 7 is dropped in a melted matter reservoir, the ash in sintered state is performed by melted disposal in the reservoir. Electrodes are inserted into the melted matter 7 in the melted matter reservoir, energized by an alternate current, heated up about 1,300-1,500 deg.C in temperature by the Joule heat, then the ash is melted, finally, the waste is discharged to the outside of the furnace through a cinder discharging port 8, cooled by the open air.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating waste containing organic matter.

Sludge such as wet sewage sludge and leather sludge after leather processing emit strange odors and are inherently unsanitary, so they were traditionally disposed of in landfills, but it has become increasingly difficult to secure land for landfills. ing. Therefore, in recent years, a method has been proposed in which the sludge is dried to form a dry cake and then melted and solidified at high temperatures. One of the methods is solidification using an electric arc furnace.

This method uses an electric arc furnace based on a steelmaking arc furnace equipped with graphite electrodes at a temperature of about 1450 to 1550°C.
A metal hot water made of a base metal, for example iron, is placed in a warm molten state, and the dried cake is added thereto to capture the heavy metals contained in the base metal, and the inorganic component contains a portion of the heavy metals. The molten slag is floated and separated on the base metal and taken out of the furnace to cool and solidify.
At the same time, effective combustible gases etc. from the generated gas are recovered. This method has the disadvantage that a large amount of arc heat is dissipated from the upper part of the furnace, a large amount of graphite electrode is consumed, and the work of replenishing the graphite electrode is troublesome. There is also the problem that an electrode position control mechanism is required, which increases the size of the equipment itself. In addition, without using the above-mentioned base metal, the dry cake itself is externally heated or incinerated using a heating or incineration device other than arc heat until it becomes molten, and once melted, the molten material acts as an electrical conductor. Taking advantage of this property, a processing method has also been considered in which electrodes are installed in the melting furnace body and AC current is applied to internally heat the melting furnace (Joule heating). However, this method has the disadvantage that an initial heating device or incinerator is required to initially melt or incinerate the dried sludge cake.

Therefore, the inventors of the present invention have conducted intensive studies on energy-efficient m-melting processing equipment that does not require such initial heating or incineration equipment. They discovered that organic matter in waste can be burned or carbonized in the upper part of a waste treatment furnace, and that the remaining inorganic matter can be easily melted and processed, thereby completing the present invention.

That is, the gist of the present invention is characterized in that organic matter-containing self-combustible waste is burned or carbonized in the upper part of the waste treatment furnace body, and the remaining inorganic matter is added to the m melt pool in the lower part of the furnace body for melting treatment. It's in the waste disposal method.

To explain the present invention in more detail below, the organic matter-containing waste to be treated in the present invention refers to waste that contains organic matter and is capable of self-combustible combustion. Examples include waste obtained by drying sewage sludge and then pulverizing or granulating it, and waste obtained by pulverizing plastic waste. Generally 80'O~1100k
can/ku) It is said that self-combustion is possible if there is a calorific value, and it is not limited to sewage sludge and plastic waste.
Of course, other wastes with higher calorific values can also be treated. Sewage sludge weighs 1700-2500k per dry matter (DS), depending on the type of flocculant used in the concentration and dewatering process.
It has an energy of caJL/kgDs. Therefore, the water content that can self-combust (e.g. 1700k can/kg
Ds of about 0 to 10%), the waste can be sufficiently treated by the method of the present invention.

An example of an apparatus for treating such organic-containing combustible waste will be described below. FIG. 1 shows a first example of the apparatus, in which the melting furnace 1 consists of a container constructed of a refractory material of the Si 02-AAzOa-Zr 02 series containing many chains of Z'rOz, for example. is provided with a waste inlet 2 and an air supply D3 adjacent to the inlet 2, and furthermore an auxiliary burner 4 is installed at the top of the container 1. Further, two exhaust ports 5 are provided from the middle of the melting processing furnace 1, and the melting processing furnace 1 is further provided with an electric ai 6.6 that can freely appear and retract from the furnace body in the horizontal direction. An alternating current is passed through the N-pole 6.6 through a power transformer for voltage adjustment (not shown), and the metal material 7 becomes a conductor, generating Joule heat and maintaining the molten state by internal heating. Typical examples include molybdenum electrodes, as well as graphite, iron, tin oxide, and tungsten electrodes. Molybdenum and tungsten have high specific gravity of 10 and 19, respectively, so they can be used for compact electricity.
J, l/1 gz 6A ′fL yf a& +-)
tb JIG Kuraz %* ^'alp RK+
When treating materials containing metal oxides such as Fe2O's, such as sewage sludge containing lime and iron salts, tin and tin oxide electrodes reduce the oxides and wear out. It is economical because there is little to do. Therefore, tin oxide electrodes are advantageous when treating sludge containing mainly heavy metals. 8 is a slag outlet provided at the bottom of the melting furnace 1.

In order to carry out the method of the present invention using such an apparatus, organic matter-containing self-combustible waste is first granulated to a diameter of 1 to 3 ml, and then charged from the input port 2. At that time, air supply port 3
By adding oxygen to air or air, 40 to 60 m/
The inside of the processing furnace 1 is preheated to 600 to 800°C by the auxiliary combustion burner 4. Then, the waste 9 rides on the air flow at a speed of 40 to 60II/S and flows into the processing furnace. Enter inside and rotate at the upper part of the furnace. While swirling, the waste 9 burns, and the ash after combustion falls onto the melt 7. On this occasion! If not enough of component 11 is present in the furnace, waste 7 is carbonized instead of being burned.

At this time, flammable gas is generated, which is exhausted from the exhaust port 5 and effectively used for other purposes. The ash that falls into the melting pool where the melt 7 is present and is in the 1=sintered state is melted here. An electrode is inserted into the melt 7 in this melt pool, and 4 alternating current is applied, and Joule heat is applied to
It is heated and melted to about 150°C. The melted waste is discharged from the furnace through the slag outlet 8 and cooled by air. It is then crushed and effectively used as aggregate. It can also be effectively used as granulated slag.

FIG. 2 shows a second example of an apparatus for implementing the method of the present invention, and in this 'J apparatus, the upper part of the melting furnace 1o is opened,
A rotary kiln 11 is connected to the rotary kiln 11, and an auxiliary burner 12 and an air supply port 18 are provided at the end of the rotary kiln 11, and an input port 13 is provided near the end. Further, an exhaust port 14 is provided in the melting processing furnace 1o.

To carry out the present invention using a device such as U), the interior of the rotary kiln 11 must be heated at 600 to
The waste 14 which has been heated to 800° C. and crushed from the input 1 13 is charged and burnt in the rotary kiln 11 while rotating it. At this time, if there is insufficient oxygen in the kiln 11 as in the first example, the combustible gas produced by carbonization is discharged from the exhaust port 16.

The burned or carbonized waste 14 then falls onto the melt pool 15, where the electrodes 19.19 are energized. When it falls, it becomes one with the molten material 15, is melted and processed, and after the processing is discharged from the slag outlet 17 and is effectively utilized in the same way as in the first example.

The above-mentioned apparatuses are all so-called direct current type melting furnaces in which electrodes are inserted into the molten material and generated by Joule heating; however, the present invention is not limited to this, and other types of melting furnaces For example, it may be an arc furnace into which the electrode is inserted from the top.

As detailed above, the method of the present invention is characterized in that organic matter-containing self-combustible waste is burned in the upper part of the waste treatment furnace main body, and after combustion, this residue is added to a melting pool for melting treatment. It's in the processing method. Therefore, according to the present invention, organic matter-containing combustible waste can be melt-processed simultaneously with combustion or carbonization.

Therefore, the energy required for processing can be used effectively, and there is no need to move processing intermediates from place to place during processing, so that they can be processed together.

[Example] A dried cake of sewage sludge (water content 20%) was prepared with a diameter of 1 to 3.
The pellets were granulated to a size of mm and charged into the melting furnace 1 shown in FIG. 1 through the inlet 2. The inside of the processing furnace 1 is heated to 800℃ by the auxiliary combustion burner 4.
It was heated to. At this time, air was also blown from the air supply port 3, and the particles were swirled and burned by the air flow. The ash after combustion falls onto the melt 7, where 95
kwl+/l - The object to be treated was melted using an alternating current.

Incidentally, when the object to be treated like It'i11 was sintered in a sintering furnace and then melted in the same manner, an alternating current of 830 kwh per object was required.

[Brief explanation of drawings]

FIG. 1 shows a solution for carrying out the method of the present invention. 1! ! I! l
It is a schematic cross-sectional view showing a first example of a metal furnace, and FIG. 2 is a schematic cross-sectional view showing a second example of the metal furnace. 1.10...Melting treatment furnace 4.12...Auxiliary combustion burner 2.13...Insertion D 11...Rotary kiln 7.15...Melting pool Agent Patent attorney Tsutomu Sadatsu and 1 other person assigned E C Hariha faction

Claims (1)

[Scope of Claims] 1. A waste treatment characterized by burning or carbonizing organic matter-containing self-combustible waste in the upper part of the waste treatment furnace body, and adding the remaining inorganic matter to a melting pool in the lower part of the furnace body for melting treatment. Material processing method. 2. The waste treatment method according to claim 1, wherein the organic matter-containing combustible waste is dried sewage sludge. 3. The waste treatment method according to claim 1, wherein the combustion of organic matter-containing self-combustible waste is carried out while rotating the waste treatment furnace at the upper part of the main body. 4. The waste treatment method according to claim 1, wherein the molten pool is generated by Joule heating by inserting an electrode into the molten material.