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Method for repairing combined polluted soil and equipment system therefor

A compound pollution and soil technology, applied in the restoration of polluted soil, etc., can solve the problems of days or even months, the inability to realize the treatment of heavy metal ions, and the need to improve the repair rate. short time effect

Inactive Publication Date: 2020-11-03
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology usually has a better effect on the degradation of organic matter in aqueous solution, while organic pollutants in soil are often adsorbed and wrapped by soil particles, and its hydrothermal oxidation degradation efficiency needs to be further improved.
At the same time, hydrothermal oxidation technology cannot achieve the purpose of heavy metal ion treatment in soil, and passivation agents have been widely used in the passivation treatment of heavy metal ions in soil, but the conventional passivation treatment process usually takes several days or even several years. months, the repair rate needs to be improved

Method used

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  • Method for repairing combined polluted soil and equipment system therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 As shown, the petroleum hydrocarbon-heavy metal compound polluted soil was remediated according to the following steps:

[0043] (1) Mixing of solid materials: Add the composite polluted soil containing petroleum hydrocarbons and heavy metals Cd and Cu, solid catalyst TiO2, and solid passivator hydrocalumite to the agitator in a ratio of 1:0.2:0.4 to start stirring, so that its uniform mixing;

[0044] (2) Material preheating: Add the uniformly mixed solid material to preheater 1 to preheat to 300°C, add water to preheater 2 to preheat to 300°C, and simultaneously add oxidant to preheater Preheat to 300°C in container 3;

[0045] (3) Material sampling: the preheated solid material is added to the reactor from the upper end, the preheated water is added to the reactor from the lower end synchronously, and the preheated oxidant is added to the reactor from the lower end synchronously;

[0046] (4) Synergistic passivation reaction of hydrothermal cataly...

Embodiment 2

[0052] Such as figure 1 As shown, the PCB-heavy metal compound polluted soil was remediated according to the following steps:

[0053] (1) Mixing of solid materials: Add composite contaminated soil containing polychlorinated biphenyls and heavy metals Pb and Zn, solid catalyst Al2O3, and solid passivator sepiolite to the agitator at a ratio of 1:0.05:0.5 to start stirring, make it evenly mixed;

[0054] (2) Material preheating: put the mixed solid material into the preheater 1 to preheat to 150°C, add water to the preheater 2 to preheat to 150°C, and simultaneously add the oxidant to the preheater Preheat to 150°C in container 3;

[0055] (3) Material sampling: the preheated solid material is added to the reactor from the upper end, the preheated water is added to the reactor from the lower end synchronously, and the preheated oxidant is added to the reactor from the lower end synchronously;

[0056] (4) Synergistic passivation reaction of hydrothermal catalytic oxidation: ...

Embodiment 3

[0062] Such as figure 1 As shown, the polycyclic aromatic hydrocarbons-heavy metal compound polluted soil was remediated according to the following steps:

[0063] (1) Mixing of solid materials: Add the composite polluted soil containing polycyclic aromatic hydrocarbons and heavy metals Cd and Pb, solid catalyst TiO2, and solid passivator sepiolite to the agitator in a ratio of 1:0.3:0.05 to start stirring, so that its uniform mixing;

[0064] (2) Material preheating: Add the uniformly mixed solid material to preheater 1 to preheat to 400°C, add water to preheater 2 to preheat to 400°C, and simultaneously add oxidant to the preheater Preheat to 400°C in container 3;

[0065] (3) Material sampling: the preheated solid material is added to the reactor from the upper end, the preheated water is added to the reactor from the lower end synchronously, and the preheated oxidant is added to the reactor from the lower end synchronously;

[0066] (4) Synergistic passivation reaction ...

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Abstract

The invention belongs to the technical field of chemical engineering and environmental protection, and discloses a method for repairing combined pollution soil and an equipment system therefor. The method comprises the following steps: (1) uniformly mixing and stirring the composite contaminated soil, a catalyst and a passivator; (2) preheating the uniformly mixed solid material to 150-400 DEG C,and adding the preheated solid material into a reactor from the upper end; (3) preheating water to 150-400 DEG C, and adding the preheated water into the reactor from the lower end; (4) preheating anoxidizing agent to 150-400 DEG C, and adding the oxidizing agent into the reactor from the lower end; (5) introducing the reacted material into a solid separator, and separating the solid material; (6) adjusting the temperature and the pressure of the separated fluid; and (7) introducing the fluid into a gas-liquid separator, and separating out gas and liquid. The method provided by the inventionnot only realizes efficient oxidative degradation of organic pollutants in the combined polluted soil, but also realizes passivation treatment of heavy metal ions, and provides an adaptive equipment system.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and environmental protection, and specifically relates to a method for repairing organic pollutant-heavy metal compound polluted soil and an equipment system thereof. Background technique [0002] Soil is a major site of food production and a major receptor for pollutants. The "State of the World's Soil Resources" published by the United Nations in 2015 pointed out that soil pollution is one of the top ten threats to the degradation of soil functions, which has caused harm to the natural ecosystem and seriously affected the safety of the ecological environment and human health. The focus of attention, soil pollution control urgently needs to be resolved. Among them, organic pollutants and heavy metals are two types of important environmental pollutants that widely exist at present. They have serious environmental hazards and environmental risks, are important factors affecting ecolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/00B09C1/08
Inventor 陈鸿珍陈忠吴胜军
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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