The invention discloses a remediation method of organic contaminant-heavy metal compound contaminated soil The remediation method comprises the following steps: adding persulfate into organic matter-heavy metal compound contaminated soil, and on the basis of effective oxidative degradation of organic contaminant, further using iron-based biochar for passivating heavy metals after playing an activating effect so as to achieve effective remediation of the organic matter-heavy metal compound contaminated soil Compared with the method for remedying contaminated soil with single contamination by using the biochar or the persulfate, the remediation method provided by the invention has the advantages as follows: two methods are combined for remedying organic matter-heavy metal compound contamination, the persulfate is used for oxidizing organic matters and can fully mineralize the organic matters; for heavy metal contaminated soil, the persulfate can oxidize the heavy metals, and reduces the pH of the soil to cause an increase in the concentration of effective-state metal; the biochar fixes the heavy metals to the surface through adsorption, so that the bioavailability of the heavy metals is reduced

Remediation method of organic contaminant-heavy metal compound contaminated soil

The invention relates to an organic polluted site soil in-situ chemical oxidation repairing method based on iron cycling regulation. The organic polluted site soil in-situ chemical oxidation repairing method comprises the steps that a mixed solution of natural organic small molecules and hydrogen peroxide is added into to-be-repaired organic polluted site soil; iron minerals naturally existing in the soil is activated through the natural organic small molecules to serve as effective iron sources for decomposing the hydrogen peroxide; and the hydrogen peroxide is efficiently decomposed into hydroxyl free radicals, so that organic polluted site soil in-situ chemical oxidation repairing is achieved. According to the organic polluted site soil in-situ chemical oxidation repairing method based on iron cycling regulation, the iron minerals naturally existing in the soil is activated through the natural organic small molecules, so that the problem that ferrous ions need to be additionally added in a traditional hydrogen peroxide chemical oxidation technology is solved, and the mass transfer problem caused by direct contact between the hydroxyl free radicals produced through hydrogen peroxide decomposition and organic pollutants in the soil is solved; and the method is used for in-situ chemical oxidation repairing of the organic matter polluted soil and has the advantages of being efficient, non-selective, savable in cost, environmentally friendly, free of secondary pollution, and the like.

Organic polluted site soil in-situ chemical oxidation repairing method based on iron cycling regulation

The invention provides a method for repairing organic contaminated soil with sludge splitting liquid and submicron calcium peroxide and belongs to the technical field of environmental engineering soil repairing The residual sludge splitting liquid serves as an environment-friendly cheap dispersing agent prepared of the submicron calcium peroxide and serves as a metabolism promoting matrix of soil indigenous microorganisms, and the submicron calcium peroxide and the sludge splitting liquid are jointly used for repairing the organic contaminated soil The method for repairing the organic contaminated soil with the sludge splitting liquid and the submicron calcium peroxide has the effects and benefits that a repairing agent is simple in preparation process, low in cost and free of secondary pollution when used for soil repairing; the technical bottlenecks that the operating cost during biological promoting repairing of the organic contaminated soil is slightly high, and large-scale application of biological promoting repairing is limited can be effectively overcome; and the method has broad application prospects in repairing of halogenated organics, nitrogen-containing aromatic compounds and soil contaminated by petroleum hydrocarbon

Method for repairing organic contaminated soil with sludge splitting liquid and submicron calcium peroxide

The invention belongs to the field of environmental pollution improvement and particularly relates to a method for remediating soil and underground water polluted by organic matter by promoting activation of persulfate through natural small organic molecules. The method is characterized in that a mixed solution of natural small organic molecules and persulfate is added to to-be-remediated soil or underground water polluted by organic matter, an active species generated after reaction of the natural small organic molecules and iron minerals and/or soluble ferric ions (Fe(III)) in the to-be-remediated soil or underground water polluted by the organic matter are used as an activating agent of persulfate, and the soil and underground water polluted by the organic matter are remediated. The method is used for remediating the soil and the underground water polluted by the organic matter and has the advantages of being efficient, non-selective, environment-friendly, free of secondary pollution and the like.

Method for remediating soil and underground water polluted by organic matter by promoting activation of persulfate through natural small organic molecules

The invention relates to a method for repairing organic polluted soil through the combination of nano humic acid and ferrous ion activation persulfate. The method includes the following steps that an alkali dissolution acidification precipitation method is matched with a high shear technology for preparing nano humic acid firstly, then a proper amount of nano humic acid, ferrous salt, sulfate liquor and water are sequentially added into the organic polluted soil, sufficient and even stirring is conducted, and a hydroxyl free radical is generated in a reaction system so as to degrade organic pollutants. A nano humic acid/ferrous salt synergistic activation persulfate system of the method can be used under the normal temperature, compared with a common persulfate activation method, the pH application range is wider, the defect that the hydroxyl free radical need to degrade organic pollutants under the acid condition in an existing oxidization technology is overcome, the oxidization reaction capability is higher, the efficiency of synergistic catalyzing is higher, and the degrading effect of organic pollutants is more obvious. In addition, raw materials such as humic acid and ferrous salt are easy to obtain, and the cost is low. The method has a wide application prospect in the aspect for governing organic polluted soil.

Method for repairing organic polluted soil through combination of nano humic acid and ferrous ion activation persulfate

The invention relates to a method for combined remediation of organic matter polluted soil. The method comprises the following steps: (1) adding water solution of a surfactant into in an organic matter polluted soil device and carrying out solubilizing treatment; (2) adding persulfate and an activator to carry out reaction, and drying separation and drying after the reaction is completed, so as to obtain remediated organic matter polluted soil. Compared with the prior art, the method provided by the invention has the advantages of being high in rate of removing adsorbed-state organic pollutants, low in cost, simple, feasible and environment-friendly.

Method for combined remediation of organic matter polluted soil

The invention relates to a method for removing semi-volatile organic pollutants in soil through a Fenton-like oxidation process. The method comprises the following steps: adding organic acid into polluted soil with a certain water content to prepare an acidic slurry with a pH value of 3-4, then adding alkaline solid peroxides and metal salts into the acidic slurry to obtain a Fenton's-like reaction system, enabling the Fenton's-like reaction system to react with the soil for a certain time under a certain temperature, and removing the organic pollutants in the polluted soil. Compared with theprior art, the method has the advantages of short remediation period of organic polluted soil, excellent pollutant removal effect, low damage to intrinsic physical and chemical properties of the soiland capability of preventing the soil from being acidized.

Method for removing semi-volatile organic pollutants in soil through Fenton-like oxidation process

The invention relates to a catalyst for volatile halocarbon catalytic combustion removal and its preparation method and use. Fe, Ni, Cu, Co, V or Mn metal oxide is used as an active ingredient, SBA-15, MCM-41 or ZSM-22 is used as a carrier, through an immersion method, an ion exchange method, a grafting method, a riveting method or a solid phase grinding method, the active ingredient is carried by the carrier, and the catalyst is used for volatile halocarbon catalytic combustion in air. Compared with the existing similar catalyst, the catalyst provided by the invention has the advantages of simple preparation processes, low price, high catalytic activity in the reaction, strong catalysis stability, complete discharge of produced CO2, H2O and halogen hydride after alkali lye absorption treatment and no secondary pollution.

Catalyst for volatile halocarbon catalytic combustion and its preparation method and use

The invention relates to a method for desorbing volatile chlorinated hydrocarbon from a gas phase by physical absorption. A molecular sieve is used as an adsorbent, and after being adsorbed, the volatile chlorinated hydrocarbon in the gas phase is transferred to a solid phase, so that the volatile chlorinated hydrocarbon is separated from the gas phase; and after being saturated, the molecular sieve can be regenerated, and therefore, the purpose of reusing the molecular sieve is achieved. Compared with the prior art, the molecular sieve has the advantages that chlorinated hydrocarbon adsorption amount is large, a regeneration method is simple, and the molecular sieve can be reused. The molecular sieve can be widely applied to desorption of the volatile chlorinated hydrocarbon in poisonous gas generated in a soil repairing process.

Method for desorbing volatile chlorinated hydrocarbon from gas phase by physical absorption

The invention relates to an organic exhaust gas processing system The organic exhaust gas processing system comprises an adsorption system, and a blower fan, a flowmeter, and an adsorption device which are arranged in the adsorption system, and an adsorption tower and a heating regeneration loop system which are arranged in the adsorption device, and a nitrogen gas source, an electric heater, a heat exchanger, a pressure increased storage tank, a booster pump, and a condensation recovery system which are arranged in the heating regeneration loop system, and a first order condenser, a second order condenser, a third order condenser, a gas liquid separator, and a liquid storage tank which are arranged in the condensation recovery system Compared with the prior art, the organic exhaust gasprocessing system is simple and compact in structure; continuous operation can be realized; the heating regeneration loop system is adopted, so that organic exhaust gas processing adsorbent heating regeneration can be realized; the condensation recovery system is adopted, so that organic solvent recycling is realized; operation is simple; economical and practical value is high; recycling benefit is improved greatly; and secondary pollution of the device in operation is reduced effectively

Ge Weilin

Papers

Method for combined remediation of organic matter polluted soil

Method for removing semi-volatile organic pollutants in soil through Fenton-like oxidation process

Catalyst for volatile halocarbon catalytic combustion and its preparation method and use

Method for desorbing volatile chlorinated hydrocarbon from gas phase by physical absorption

Organic exhaust gas processing system