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Method and system for desorbing or fixing organic matters and metals in soil by using solar-driven desorbing agent

A desorbent and solar energy technology, applied in the field of pollutant treatment, can solve the problems of large resource consumption, high energy consumption, and urgent problems, and achieve the effects of solving energy consumption, improving waterside steam capacity, and reducing implementation costs.

Pending Publication Date: 2020-10-09
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common feature of these existing methods is the implementation of full-plan control and cleaning of the soil treatment, so the energy consumption is high and the resource consumption is large. Considering that the amount of soil treatment belongs to the scope of civil engineering, the cost of treatment by conventional physical and chemical methods is high. no less
[0004] Soil treatment belongs to civil engineering, and its scale and energy, resources, and manpower input are very large, so it increases the difficulty of treatment, but the problem is urgent

Method used

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  • Method and system for desorbing or fixing organic matters and metals in soil by using solar-driven desorbing agent
  • Method and system for desorbing or fixing organic matters and metals in soil by using solar-driven desorbing agent
  • Method and system for desorbing or fixing organic matters and metals in soil by using solar-driven desorbing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In the present embodiment, select polluted soil experiment, use graphene oxide and titanium dioxide as desorbent, the mass ratio of graphene oxide and titanium dioxide is 0.25:1, take water as solvent, make desorbent solution, wherein The mass ratio of graphene oxide to water is 1:10, and the mass ratio of the total amount of desorbent to soil is 1:100kg / kg. The desorbent in the polluted soil layer will be collected for solar irradiation (irradiation intensity is 2000W / m 2 ), titanium dioxide photocatalyzed the digestion of organic matter, light irradiation was sampled every 10 minutes, and the test results are shown in Figure 4 ; Graphene fixes the heavy metal elements in the soil, and the fixation efficiency in this experiment reaches 73.2%.

Embodiment 2

[0042] Same as Example 1, the difference is that the desorbing agent is a mixture of graphene oxide and / or iron-based oxide, wherein the first desorbing agent (desorbing agent 1#) is ferric oxide and non A mixture of magnetic ferric oxide, the mass ratio of ferric oxide and ferric oxide is 1:1, using water as a solvent to make a desorbent solution, the mass ratio of ferric oxide and water is 1:20 , The mass ratio of the total amount of adsorbent to the soil is 1:100kg / kg. The second desorbing agent (desorbing agent 2#) is the mixture of ferric oxide and magnetic ferric oxide (ferric oxide-M), and the mass ratio of ferric oxide and ferric oxide is 1: 1. Use water as a solvent to make a desorbent solution, in which the mass ratio of ferric oxide to water is 1:20, and the mass ratio of the total amount of adsorbent to soil is 1:100kg / kg. The third desorbing agent (desorbing agent 3#) is the mixture of ferric oxide and magnetic ferric oxide (ferric oxide-M) and graphene oxide, fe...

Embodiment 3

[0045] The same as Example 1, the difference is that only industrial solid waste is used as the desorbent. In this embodiment, phosphate rock solid waste is specifically used, and water is used as a solvent to make a desorbent solution, wherein the phosphate rock solid waste is mixed with water The mass ratio of the adsorbent is 1:10, and the mass ratio of the total amount of adsorbent to the soil is 2:100kg / kg. The irradiation intensity in this embodiment is the same as in Embodiment 1. The experiment found that the digestion rate of solid waste organic matter using only phosphate rock is only 14.9%, but the fixation efficiency of heavy metals is as high as 82.6%. If a mixture of phosphate rock solid waste and graphene oxide is used as the desorbent solution, the mass ratio of phosphate rock solid waste to water is 0.5:10, and the mass ratio of phosphate rock solid waste to graphene oxide is 1:0.33 , the mass ratio of the total amount of desorbent to soil is 2:100kg / kg, the ...

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Abstract

The invention discloses a method and a system for desorbing or fixing organic matters and metals in soil by using a solar-driven desorbing agent. The system comprises a desorption agent injection mechanism and a steam pressurization system, the desorption agent injection mechanism comprises a plurality of injection units which are uniformly arranged; a plurality of injection holes are formed in the injection unit; the steam pressurization system comprises a solar absorber and a booster pump; water and a desorption agent are respectively added into the solar absorber, the water is changed intowater vapor after being irradiated by solar energy of the solar absorber, the water vapor and the desorption agent push the desorption agent to be injected into the desorption agent injection mechanism through the booster pump, and then the desorption agent is injected into a polluted soil layer through the injection holes. The whole process is driven by solar energy, efficient energy conversion is achieved by means of thermally induced pressurization, thermally induced vacuum, low-temperature condensation and the like which are suitable for civil engineering implementation, and organic matter, metal and soil are separated, digested and converted into harmless substances and permanently fixed.

Description

technical field [0001] The invention relates to the technical field of pollutant treatment, in particular to a method and system for desorbing or fixing organic substances and metals in soil driven by solar energy. Background technique [0002] Soil is an important part of the environment and the foundation of agricultural economic development. It is related to the health and quality of life of the people and the construction of a beautiful China. Protecting the soil environment is an important part of promoting the construction of ecological civilization and maintaining national ecological security. At present, the overall situation of my country's soil environment is worrying, and some areas are seriously polluted, which has become one of the outstanding shortcomings in building a well-off society in an all-round way. At present, the overall situation of my country's soil environment is worrying, and some areas are seriously polluted, which has become one of the outstandin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08
Inventor 曹晏
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI