Technical process for supercritical water treatment of polychlorinated biphenyls (PCBs) waste and complete plant thereof

A technology of supercritical water and polychlorinated biphenyls, which is applied in the direction of protection devices against harmful chemical agents, etc.

Inactive Publication Date: 2010-10-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current treatment and disposal method of PCBs is mainly incineration, and the secondary pollution caused by incineration makes it very urgent to develop environmentally friendly PCB treatment and disposal methods.

Method used

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  • Technical process for supercritical water treatment of polychlorinated biphenyls (PCBs) waste and complete plant thereof
  • Technical process for supercritical water treatment of polychlorinated biphenyls (PCBs) waste and complete plant thereof
  • Technical process for supercritical water treatment of polychlorinated biphenyls (PCBs) waste and complete plant thereof

Examples

Experimental program
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Embodiment Construction

[0009] Such as figure 1 and figure 2 As shown, 1ml of waste capacitor oil containing 60% (w / w%) PCBs is placed in the reaction kettle of a manual pressurized supercritical water reaction device with a volume of 100ml, and the density of the capacitor oil is 1.5g / ml. Add 70ml of deionized water to the reaction kettle, then add 1g of Na 2 CO 3 , and finally add 10ml H 2 o 2 Immediately afterwards, seal the reaction kettle, heat it after tightening, and start timing after the temperature rises to 420°C. At this time, the pressure in the container is controlled at 25MPa by a manual pressurization device, and the heating is stopped after 40 minutes of reaction. After the temperature drops to room temperature, the reactor body is opened, and the reactant is transferred to a centrifuge tube. After centrifugation, the solid phase is NaCl formed during the reaction; the liquid phase is rinsed with n-hexane, the washing liquid is combined with the liquid phase, and the liquid phase...

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Abstract

Aiming at the difficulties for harmlessly treating polychlorinated biphenyl (PCBs) waste and heavy pollution caused by burning treatment, the invention develops a suit of environment-friendly technical process for treating PCBs waste and establishes related complete plant thereof. The invention combines morphological characteristics of PCBs, especially the morphological characteristic of PCBs in waste capacitor oil and transformer oil and then adopts the technique of supercritical water oxidation to oxidize the PCBs contained in liquid medium into environment-friendly CO2 and H2O completely by introducing catalysts and reaction active agent. Therefore, the PCBs waste can be treated harmlessly.

Description

technical field [0001] The invention relates to the harmless treatment and disposal of persistent organic pollutants (POPs), belongs to the control and treatment of waste pollutants in the field of environmental protection, and is especially suitable for the harmless disposal of liquid hazardous waste. Background technique [0002] PCBs are one of the 12 POPs listed in the Stockholm Convention. The production of PCBs for industrial use stopped as early as the early 1980s, but most of the industrial equipment containing PCBs, such as transformers and capacitors, were simply stored in mountains after mandatory phase-out, and most of the storage sites have exceeded Beyond the design life, there is a potential risk of PCBs leaking into the environment in the form of surface runoff. my country's original basic data reserves on the treatment and disposal of PCBs are very incomplete, while the data on supercritical water treatment and disposal are basically blank. The current tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/38A62D101/22
Inventor 张付申修福荣朱能敏
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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