Waste processing method and waste processing apparatus

A treatment method and waste technology, which is applied in the direction of oxidation treatment sludge, solid waste removal, oxidized water/sewage treatment, etc. It can solve problems such as difficult treatment, reduced solubility of inorganic substances, high maintenance and repair costs, etc.

Inactive Publication Date: 2005-10-19
KK TOSHIBA
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Problems solved by technology

[0008] However, in the supercritical state, the solubility of inorganic substances is significantly reduced, and the inorganic substances contained in organic waste are precipitated on the surface of the reactor, blocking the reactor.
In particular, the solubility of oxides of inorganic substances is small, and the above-mentioned problems are more likely to occur
[0009] For example, when disposing of waste generated by nuclear power plants, it is not easy to dispose of due to the precipitation of radioactive substances, and the maintenance and repair of waste treatment equipment requires more costs

Method used

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  • Waste processing method and waste processing apparatus
  • Waste processing method and waste processing apparatus
  • Waste processing method and waste processing apparatus

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Experimental program
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Embodiment 1

[0232] figure 1 A process diagram showing Embodiment 1 of the present invention. figure 2 It is a process diagram of a conventional example.

[0233] Such as figure 2 As shown, in the conventional method, water as a medium is brought into a supercritical state in the medium supercriticalization step 1 . In the mixing step 2, sulfate-containing organic waste is added to the supercritical water. In the supercritical decomposition step 6, the resulting mixture is kept together with an oxidizing agent at a high temperature and pressure exceeding the critical point of water for a predetermined time. Organic waste containing sulfate is oxidatively decomposed in supercritical water.

[0234] The generated decomposed gas and decomposed liquid, and inorganic substances (oxides, etc.) such as sulfate contained in the organic waste are sent to the recovery process 5, and receive treatment such as recovery and solidification of harmful substances.

[0235] On the other hand, in the...

Embodiment 2

[0268] In the method of embodiment 2, in figure 2 In the existing medium supercriticalization step 1 shown, the hydrogen ion is 10 for 1 kg of water -4 The inorganic acid is added in a mole or more to bring the solution into a supercritical state, and is used as a supercritical medium in the subsequent steps.

[0269] According to the research of Smith et al., the metal elements in nitric acid waste liquid are hydrolyzed as shown in V formula under high temperature and high pressure, and then thermally decomposed as shown in VI formula, and finally become oxides.

[0270] Nitric acid generated in formula V generates oxygen after thermal decomposition, so it is easy to form oxides.

[0271] ...Type V

[0272] ...formula VI

[0273] To prevent such hydrolysis, acid must be added, shifting the equilibrium of formula V to the left.

[0274] The concentration of hydrogen ions in water is closely related to the ion product of water. Figure 4 Ind...

Embodiment 3

[0306] Image 6 is a schematic diagram showing the waste treatment device of this embodiment.

[0307] The waste treatment device of this embodiment is equipped with: a reactor 11 for treating organic waste in a supercritical state of water, an organic waste supply device 12 for feeding organic waste into the reactor 11, and supplying water as a medium to the reactor. A water supply device 13 at 11, an oxidation reactor 14 for oxidizing low-molecular-weight organic substances produced in the reactor 11, an oxidant supply device 15 for supplying an oxidizing agent to the oxidation reactor 14, and a recovery device 30 for recovering a product of the oxidation reactor 14.

[0308] The recovery unit 30 is equipped with a gas-liquid separator 33 , a gas treatment unit 34 , and a liquid treatment unit 40 .

[0309] The liquid treatment device 40 has a drier 45 and a solidifier 46 for drying and solidifying the liquid sludge.

[0310] In this embodiment, the reactor 11 and the oxid...

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Abstract

The invention provides a waste processing method and a waste processing apparatus. The waste processing method decomposes an organic substance or an inorganic substance contained in organic wastes or inorganic wastes by holding a mixture of the organic wastes or the inorganic wastes and a medium, which is in its supercritical state, for a pre-determined time period, in which the hydrogen ion concentration of the medium is 10<-4>mol or more to 1kg of the medium. The waste processing method has a step of decomposing all or almost all of an organic substance included in organic wastes into lower-molecular-weight products by holding the organic wastes in a medium, which is in its supercritical state, for a pre-determined time and a step of oxidizing the lower-molecular-weight products by holding a mixture of an oxidant and the lower-molecular-weight products in the medium, which is in its subcritical state, for a pre-determined time period.

Description

[0001] This application is a divisional application with the title of invention "waste treatment method and waste treatment device", the filing date is August 20, 1998, and the application number is 98117610.0. technical field [0002] The invention relates to a treatment method and a treatment device for organic waste, as well as a treatment method and a treatment device for inorganic waste. Background technique [0003] In recent years, polymer containers, resins such as polyvinyl chloride, and disposal of organic waste containing radioactive substances have caused serious problems to the global environment. Usually, organic waste is treated by incineration, which produces toxic substances such as carbon dioxide and nitrogen oxides, and large-scale equipment is required to recover these toxic substances. [0004] Inorganic waste in the field of atomic energy, in addition to radioactive substances, also contains a large amount of sodium nitrate. These substances are buried...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C02F1/72C02F11/08C08J11/14G21F9/30G21F9/34
CPCY02P20/54Y02W30/62
Inventor 赤井芳惠松林义和山口恭志山田和矢小原敦
Owner KK TOSHIBA
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