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A Green and Efficient Supercritical Water Oxidation Method for Pollutants

A technology for supercritical water oxidation and pollutants, applied in the direction of water pollutants, chemical instruments and methods, separation methods, etc., can solve the problems of heat transfer/mass efficiency reduction, blockage, failure, etc., to reduce the content of inorganic salts, avoid The effect of deposition and mitigation of acidic corrosion environment

Active Publication Date: 2017-05-10
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the large-scale trial operation of SCWO technology, its problems are gradually exposed
To sum up, at present, the key bottleneck restricting the industrialization of this technology lies in: ① When the equipment and materials are in operation for a long time, they are extremely susceptible to severe corrosion and failure; ② Inorganic salts generated during the oxidation and degradation of pollutants in supercritical water are easy and deposition on the inner wall of equipment, resulting in reduced heat transfer / mass efficiency and blockage; ③The acidic substances, greenhouse gases, heavy metals and phosphorus produced after the oxidation and degradation of pollutants in supercritical water have not been properly treated

Method used

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  • A Green and Efficient Supercritical Water Oxidation Method for Pollutants

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Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the nitrogen-containing toxic liquid pollutants are treated according to the following steps:

[0028] (1) Material preparation: Add nitrogen-containing toxic liquid pollutants into the storage tank, then start stirring, and then slowly add red mud solids into the storage tank to prepare a suspension with a mass ratio of red mud to pollutants of 0.05:1 liquid;

[0029] (2) Oxidation reaction: pump the suspension prepared in step (1) into the preheater, and the mixed material in the preheater is preheated to 150°C, and then directly pumped into the supercritical water oxidation reactor. In the reactor, the mixed material and the strong oxidant—air pumped into the reactor at the same time undergo oxidative degradation reaction. The temperature in the reactor is controlled at 450°C, the pressure is 24MPa, the residence time is 60 seconds, and the excess oxygen is the theoretical oxygen demand 50% of the amount (in moles);

[0030] (3) Solid se...

Embodiment 2

[0035] (1) Material preparation: Add organic liquid pollutants containing sulfur and phosphorus to the storage tank, then start stirring, then slowly add red mud solids into the storage tank, and prepare a mass ratio of red mud to pollutants of 0.4:1 suspension;

[0036] (2) Oxidation reaction: The suspension prepared in step (1) is pumped into the preheater, and the mixed material in the preheater is preheated to 300°C, and then directly pumped into the supercritical water oxidation reactor. In the reactor, the mixed material and the strong oxidant - hydrogen peroxide pumped into the reactor at the same time undergo oxidative degradation reaction. The reaction temperature is controlled at 480°C, the pressure is 25MPa, the residence time is 80 seconds, and the peroxygen amount is 30% of the theoretical oxygen demand. % (in moles);

[0037] (3) Solid separation: the feed liquid after passing through the oxidation reactor enters the three-stage solid separator in series, and th...

Embodiment 3

[0042] (1) Material preparation: Add nitrogen-containing and sulfur-containing toxic liquid pollutants to the storage tank, then start stirring, and then slowly add red mud solids into the storage tank to prepare a mass ratio of red mud to pollutants of 0.2:1 suspension;

[0043] (2) Oxidation reaction: pump the suspension prepared in step (1) into the preheater, and the mixed material in the preheater is preheated to 200°C, and then directly pumped into the supercritical water oxidation reactor. In the reactor, the mixed material and the strong oxidant—oxygen pumped into the reactor at the same time undergo oxidative degradation reaction. The temperature in the reactor is controlled at 400°C, the pressure is 28MPa, the residence time is 15 seconds, and the excess oxygen is the theoretical oxygen demand 15% of the volume (by moles);

[0044] (3) Solid separation: The feed liquid after passing through the oxidation reactor enters the two-stage solid separator in series, and th...

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Abstract

The invention relates to a green high-efficiency pollutant supercritical water oxidization method, belonging to the fields of environmental protection and chemical industry. The method comprises the following steps: (1) adding pollutants into a storage tank, stirring, and adding red mud solid into the storage tank to prepare a suspension of red mud and pollutants in a mass ratio of (0.05-0.4):1; (2) preheating the suspension to 150-300 DEG C, directly pumping the suspension into a supercritical water oxidization reactor, and meanwhile, pumping a strong oxidizer into the supercritical water oxidization reactor; (3) introducing the reacted liquid into a series-connected two-stage or more-stage solid separator to perform gradient separation on the solid; (4) regulating the temperature and pressure of the separated fluid; and (5) directly discharging the liquid subjected to gas-liquid separation, and introducing the gas into a series-connected two-stage or more-stage red mud absorption tank. The method implements high-efficiency green operation of the pollutant supercritical water oxidative degradation process, and also implements dealkalization on the red mud, thereby being beneficial to further treatment and recycling of the red mud.

Description

technical field [0001] The invention relates to a method for synergistic treatment of waste and pollutants, in particular to a green, efficient and harmless treatment of pollutants such as high-concentration biochemically degradable organic waste water and refractory toxic waste by using supercritical water as a reaction medium A method of processing or resource utilization. It belongs to the field of environmental protection and chemical industry. Background technique [0002] Pollutant supercritical water oxidation technology (Supercritical Water Oxidation, referred to as SCWO) refers to the use of water in a supercritical state (T = 374.2 ° C, P = 22.1MPa) as a reaction medium to deeply oxidize and degrade organic pollutants into carbon dioxide, Inorganic substances such as water and nitrogen. Because the water in the supercritical state has a series of unique properties such as density, viscosity, dielectric constant, and ion product decrease, hydrogen bond weakening, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/72C02F11/00C02F11/06B01D53/78B01D53/40B01D53/62C02F101/30
Inventor 陈鸿珍王光伟徐愿坚
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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