Abstract: Disclosed are a modified nanoscale zero-valent iron (nZVI) and a preparation method and an application thereof. The preparation method of the modified nZVI includes the following steps: S1: mixing nZVI, a stabilizer and an oxidant together and stirring in an inert atmosphere to obtain a polymerization precursor solution; and S2: dripping pyrrole into the polymerization precursor solution prepared in the S1, maintaining an inert gas atmosphere for polymerization reaction, and performing cooling, filtration and vacuum drying to obtain the modified nZVI.

Abstract: An in-situ reagents injection system comprises a compressed air storage tank, a remediation reagents storage tank, an injection adjusting valve, an injection pipe, an upper sealing device and a lower sealing device. When the reagents injection is carried out, the compressed air is injected before the remediation reagents is injected, the porosity of the aquifer medium is increased by utilizing the air pressure expansion technology to form a relatively uniform dominant channel, and the remediation reagents is injected to realize uniform and efficient conveying of the reagents. The in-situ reagents injection system and method can make the homogeneous and efficient conveying of the remediation reagents, and ensure the full utilization of the remediation reagents, with low energy consumption of injection equipment, simple process, and flexible operation. The injection is performed in sections from top to bottom according to the steps to improve the in-situ reagents injection efficiency and remediation efficiency.

Abstract: A medium material for removing phenol contamination from groundwater, a method of producing the same, and use of the same id disclosed. In at least some embodiments, the medium material is a granular material which has an average particle diameter of 0.5-1.5 cm and is formed from a bacteria-entrapping solution, a manganese sand filter material, modified bentonite, and biochar at a mass ratio of 1:0.2-0.4:0.2-0.4:0.1-0.2 by a series of processes including strain culturing, catalysis, mixing, solidification, and the like. The medium material can remove phenol from groundwater, is a safe and environment-friendly material, has a long service life, and/or achieves waste treatment with waste.

Abstract: Described herein is a soil remediation material capable of absorbing and removing chromium from soil and being recycled so as to enable efficient remediation, repeated recycle, and reduction in remediation cost.

Abstract: A remediation system based on pollution obstruction for underground water with DNAPL pollutant is provided, including a vertical obstructing wall, a pump-out treating unit and a recharging unit, wherein the vertical obstructing wall is distributed at the periphery of a polluted area to obstruct the polluted underground water in the vertical obstructing wall; the pump-out treating unit includes a plurality of water pumping wells and overground treatment facility that are distributed in the polluted area, the plurality of the water pumping wells are configured to pump the polluted underground water out and sending it into the overground treatment facility so as to be treated; the recharging unit includes a plurality of recharging wells, and water treated by the overground treatment facility is recharged into a target aquifer in the polluted area by the plurality of the recharging wells. A remediation method using the system is provided.

Abstract: An in-situ thermal desorption system, an in-situ thermal desorption-oxidation remediation system and a remediation method are provided, wherein the in-situ thermal desorption system comprises a heating device and an extraction device, wherein the heating device is used for transporting heated air to the contaminated soil to desorb the organic pollutants, and wherein the extraction device is used for sucking the desorbed organic pollutants. The in-situ thermal desorption-oxidation remediation system adds a thermal catalytic oxidation device based on the in-situ thermal desorption system, wherein the organic pollutants extracted by the extraction device are catalytically degraded in the thermal catalytic oxidation device, and a device for recycling and reprocessing an exhaust gas is further added. The present disclosure also provides an in-situ thermal desorption-oxidation remediation method.

Abstract: An in-situ reagents injection system comprises a compressed air storage tank, a remediation reagents storage tank, an injection adjusting valve, an injection pipe, an upper sealing device and a lower sealing device. When the reagents injection is carried out, the compressed air is injected before the remediation reagents is injected, the porosity of the aquifer medium is increased by utilizing the air pressure expansion technology to form a relatively uniform dominant channel, and the remediation reagents is injected to realize uniform and efficient conveying of the reagents. The in-situ reagents injection system and method can make the homogeneous and efficient conveying of the remediation reagents, and ensure the full utilization of the remediation reagents, with low energy consumption of injection equipment, simple process, and flexible operation. The injection is performed in sections from top to bottom according to the steps to improve the in-situ reagents injection efficiency and remediation efficiency.

Abstract: A medium material for removing phenol contamination from groundwater, a method of producing the same, and use of the same id disclosed. In at least some embodiments, the medium material is a granular material which has an average particle diameter of 0.5-1.5 cm and is formed from a bacteria-entrapping solution, a manganese sand filter material, modified bentonite, and biochar at a mass ratio of 1:0.2-0.4:0.2-0.4:0.1-0.2 by a series of processes including strain culturing, catalysis, mixing, solidification, and the like. The medium material can remove phenol from groundwater, is a safe and environment-friendly material, has a long service life, and/or achieves waste treatment with waste.

Abstract: A soil heavy metal composite passivator and its preparation method, use method and application. The passivator is a powder particle obtained mainly by mixing modified palygorskite, biomass charcoal, quicklime and fungus residue in a mass ratio of 1:(0.3˜0.5):(0.5˜0.8):(0.2˜0.4), with an average particle size of 0.5˜1 mm. The invention further provides preparation and use methods for the above soil heavy metal composite passivator. The soil heavy metal composite passivator according to the invention can effectively passivate heavy metal pollution in farmland soil and reduce bioavailability of various heavy metals in soil so as to recover ecological and industrial functions of the soil and improve crop quality. Material selected in the present invention are safe and environmental-friendly, realized “waste control by waste itself”, have long service life, and do not cause secondary pollution to soil.

Abstract: A remediation system based on pollution obstruction for underground water with DNAPL pollutant is provided, including a vertical obstructing wall, a pump-out treating unit and a recharging unit, wherein the vertical obstructing wall is distributed at the periphery of a polluted area to obstruct the polluted underground water in the vertical obstructing wall; the pump-out treating unit includes a plurality of water pumping wells and overground treatment facility that are distributed in the polluted area, the plurality of the water pumping wells are configured to pump the polluted underground water out and sending it into the overground treatment facility so as to be treated; the recharging unit includes a plurality of recharging wells, and water treated by the overground treatment facility is recharged into a target aquifer in the polluted area by the plurality of the recharging wells. A remediation method using the system is provided.

Abstract: An in-situ thermal desorption system, an in-situ thermal desorption-oxidation remediation system and a remediation method are provided, wherein the in-situ thermal desorption system comprises a heating device and an extraction device, wherein the heating device is used for transporting heated air to the contaminated soil to desorb the organic pollutants, and wherein the extraction device is used for sucking the desorbed organic pollutants. The in-situ thermal desorption-oxidation remediation system adds a thermal catalytic oxidation device based on the in-situ thermal desorption system, wherein the organic pollutants extracted by the extraction device are catalytically degraded in the thermal catalytic oxidation device, and a device for recycling and reprocessing an exhaust gas is further added. The present disclosure also provides an in-situ thermal desorption-oxidation remediation method.

Abstract: A soil heavy metal composite passivator and its preparation method, use method and application. The passivator is a powder particle obtained mainly by mixing modified palygorskite, biomass charcoal, quicklime and fungus residue in a mass ratio of 1:(0.3˜0.5):(0.5˜0.8):(0.2˜0.4), with an average particle size of 0.5˜1 mm. The invention further provides preparation and use methods for the above soil heavy metal composite passivator. The soil heavy metal composite passivator according to the invention can effectively passivate heavy metal pollution in farmland soil and reduce bioavailability of various heavy metals in soil so as to recover ecological and industrial functions of the soil and improve crop quality. Material selected in the present invention are safe and environmental-friendly, realized “waste control by waste itself”, have long service life, and do not cause secondary pollution to soil.

Abstract: The present invention provides a remediation material for heavy-metal chromium contaminated soil, comprising: 10-30% by weight of stable curable adhesive, 30-50% by weight of composite adsorbent, and water in balance. The present invention further provides a method of preparing the remediation material. The remediation material in the present invention is capable of absorbing chromium from soil and contributes to recycle of the materials so as to enable efficient remediation, repeated recycle, and reduction in remediation cost.