Abstract: It discloses an apparatus and a method for treating oil-containing sludge, wherein, a pressurized chamber is the main structure, and a mixture of carbonic acid in water, iron-rich biochar and polyaspartic acid is sprayed in pulses by a nano-aeration device inside the pressurized chamber. The carbonic acid is decomposed into supercritical CO2 by the nano-aeration device, reducing the viscosity of petroleum hydrocarbons in the oil-containing sludge synergistically with the polyaspartic acid. The iron-rich biochar promotes dissolution of petroleum hydrocarbons from the oil-containing sludge, thus enhancing the drive-off ratio of oil phase, and improving the decomposition of residual oil organics. In the treatment of oil-containing sludge according to the present invention, high temperature retting of the separated sludge with bacterial bran increases the degree of humification of the sludge, the treated sludge contains petroleum hydrocarbon below 1%, and can be directly available to plants.

Abstract: The present invention discloses an alkali-resistant microbial bacterium PDC-1 and its application. The present invention screens and isolates PDC-1 strain from the soil of a coal gangue stockpile in a coal mine in Shandong, China, which can utilize naphthalene, phenanthrene, anthracene or pyrene as the sole carbon source and has tolerance to heavy metals. The strain of the present invention is capable to degrade various PAHs with the presence of heavy metals. The strain is alkali resistant, simple to cultivate, and has a good application in the bioremediation of polycyclic aromatic hydrocarbons and heavy metal contaminated sites.

Abstract: Provided are a silicate modified manganese-based material and a preparation method and application thereof. The silicate modified manganese-based material has a nanoscale needle like structure, and is prepared from a solution containing a manganese source and a soluble silicate source through an oxidation-reduction reaction and then a hydrothermal reaction. The manganese source includes a divalent manganese source and a heptavalent manganese source, with Mn (II) and Mn (VII) in a molar ratio of 0.5-5.5 to 1. The present disclosure uses silicate to regulate manganese oxides, significantly reducing the particle size of the manganese-based material, generating manganese vacancies, and changing the surface manganese valence state. An advanced oxidation system formed by the silicate modified manganese-based material and an oxidant has high removal rate and reaction rate for various organic compounds.

Abstract: A biochar is produced by co-pyrolysing an aquatic plant enriched with heavy metals with a clay mineral, and the aquatic plants themselves have high enrichment and adsorb heavy metals in contaminated water; heavy metals are in situ adsorbed, and are coated or enriched in the biochar, therefore extending the migration time of heavy metals, which are also very stable; attapulgite and montmorillonite as clay minerals are loaded in the biochar during the preparing process; heavy metals contained in the biochar play a catalytic role, and synergy with activated attapulgite, therefore increasing the reliability of the biochar, and effectively reducing the ecological effectiveness and potential risk of heavy metals in the biochar.

Abstract: An immobilized microbial agent for in situ restoration of contaminated sediments, composed of Hangjin clay 2 #-loaded conductive microorganisms, obtained by the following methods: 1) pretreating Hangjin clay 2 # to obtain particulate filler; 2) amplification culture of conductive microorganisms to a bacterial liquid to be inoculated, and adding the Hangjin clay 2 # pretreated in step 1 in a certain ratio, mixing under anaerobic conditions, removing the supernatant after standing, and obtaining the immobilized microbial agent; the conductive microorganisms are Geobacter sulfurreducens, Geobacter metallireducens and Shewanella. The invention also discloses a method for preparing the immobilized microbial agent and the application of in situ restoration of contaminated sediments.

Abstract: A process for producing a heavy metal mediated biochar composite using silicate solidification. Hydrocharis dubia has excellent enrichment of manganese ions in sewage, and is used to treat sewage water to adsorb heavy metals such as lead, manganese and zinc contained in the sewage water into roots, stems and leaves thereof, which are pyrolysed in stages at high temperature with activated red mud and bentonite prior to blending with zeolites, to produce said heavy metal mediated biochar composite; the process significantly extends the migration time of heavy metals, increases the stability of heavy metals and reduces the risk of environmental pollution by heavy metal leakage.

Abstract: A composite biochar for controlling heavy metal pollution and a process for producing the same, in particular enrichment of heavy metals such as arsenic and lead in soil with centipede grass, thereafter centipede grass is sintered with hydroxyapatite, sepiolite and chitosan, and compounded with microorganisms to produce said composite biochar; through the process of the present invention, heavy metals such as arsenic and lead are stably enriched or coated in said composite biochar, significantly reducing the potential hazard of arsenic and lead to the environment, and also providing new developmental ideas for treating heavy metal biomass.

Abstract: A porous biochar for improving heavy pollution and a method for producing the same. Said porous biochar is prepared as follows: arrowhead, which has excellent enrichment of lead, is used to absorb heavy metal lead in polluted water or artificial wetlands, simultaneously absorb heavy metal cadmium, thereafter is dried and treated as a biomass, and then the biomass is calcined in stages with a passivating agent in a high temperature environment, so as to heavy metals such as lead and cadmium be stably coated or enriched in a biochar, which is mixed with Pseudomonas aeruginosa having high resistant, to obtain the porous biochar; the porous biochar has high specific surface area, high porosity and excellent mechanical properties, is very stable under different acid-base environments and oxidizing conditions.

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: A silicified modified zero-valent iron, whose surface layer is a silicon-containing oxide layer formed by silicate, which is obtained by the following method: dissolved silicate and micron iron powder are used as raw materials and mixed in proportion, and ball milling under an inert gas atmosphere to obtain the silicified modified zero-valent iron. The invention also discloses the application of silicified modified zero-valent iron in repairing polluted water bodies. The invention uses green silicate as silicon source to carry out surface silicification modification of micron zero-valent iron, which has simple operation, low cost and is convenient for large-scale production. Moreover, the prepared silicified zero-valent iron has good dispersibility, high reduction activity and strong recycling performance, and can be used for the treatment of various polluted water bodies and soil.

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: An integrated two-phase anaerobic dry fermentation reactor based on a biomimetic principle of rumen includes a reactor body; wherein the reactor body includes a dry fermentation chamber, a secondary fermentation chamber, and a liquid storage chamber. The dry fermentation chamber is arranged at an upper portion of the reactor body. The liquid storage chamber is arranged at a bottom of the reactor body. The secondary fermentation chamber is arranged between the dry fermentation chamber and the liquid storage chamber in the reactor body. The dry fermentation chamber is connected to the secondary fermentation chamber by a porous structure.

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: The disclosure is a method for recovering groundwater contaminated with organic phenols. The method includes the step of injecting a remediation agent into the groundwater extracted from the stratum to be rehabilitated or ex-situ extracted, followed by the step of injecting manganese-based oxidant. By adding a suitable proportion of soluble silicon to the water to be treated as a remediation agent, the efficiency of manganese-based oxidant in the treatment of phenolic pollutants is enhanced based on interface properties and stability of various manganese oxides in the regulating and recovering process. The method for recovering groundwater contaminated with organic phenols provided by the disclosure has a simple process and is convenient to operate, the adopted chemicals are inexpensive and easy to obtain, cause little corrosion to the injection equipment, and has a wide range of applications in practice. The adopted oxidant will not produce halogenated toxic by-products during the treatment process.

Abstract: A simulation system for an in-situ column experiment in a groundwater well and a simulation method are provided. The simulation system includes: an experimental column device, a sample taking device, and a sample injection device, where solid remediation agent and/or aquifer sediment are provided within the experimental column device, and is configured to be capable of being arranged in an experimental well and located below a water level; a bottom of the experimental column device is provided with a water inlet, and a top of the experimental column device is provided with a water outlet, where the top water outlet connects to the sample taking device, and the bottom water inlet connects to the sample injection device.

Abstract: A visible light catalyst, its preparation method, a visible light catalyst activated persulfate system and its use. The visible light catalyst includes a carbon material, a transition metal compound and a coating material. The carbon material is conductive carbon material, and the transition metal compound is selected from one or more of transition metal oxides, transition metal sulfides, and acid or salt compounds containing a transition metal. The visible light catalyst has high visible light photocatalytic activity and performance of degrading organic pollutants and activating persulfate which can result in synergistically degrading degradation-resistant organic pollutants.

Abstract: Disclosed a device for preventing and controlling pollutants in the reuse of reclaimed water in agricultural activity areas with extreme water shortage, including A2/O tank (1), nano-aeration tank (2) and quick soil infiltration device (3) connected in sequence. A2/O tank (1) is fed with wastewater to be treated, which is treated sequentially in anaerobic, anoxic and aerobic environment, thereafter the supernatant is transported into nano-aeration tank (2). The supernatant treated by nano-aeration tank (2) is transported into quick soil infiltration device (3), and is allowed to flow through one or more layers of fillers laid in quick soil infiltration device (3) to degrade or remove pollutants.

Abstract: It discloses to a device and a method for controlling pollutants in metal mine water resources cycling utilization. The device includes a multi-stage inflow constructed wetland (3), in which one or more layers of the filler are laid, and water distribution pipes (4) are buried at different height levels in the filler layers for multi-stage inflow, so that the received basin water is allowed to flow through each layer of the filler to degrade or remove the pollutants. In the multi-stage inflow constructed wetland, the types of fillers, dosage ratio, particle size and filling height of fillers in each layer are specifically selected. Therefore, heavy metal adsorption, suspended matter filtration, organic matter degradation, dephosphorization and denitrification can be effectively realized in the multi-stage inflow constructed wetland.

Abstract: A silicified modified zero-valent iron, whose surface layer is a silicic-containing oxide layer formed by silicate, which is obtained by the following method: dissolved silicate and micron iron powder are used as raw materials and mixed in proportion, and ball milling under an inert gas atmosphere to obtain the silicified modified zero-valent iron. The invention also discloses the application of silicified modified zero-valent iron in repairing polluted water bodies. The invention uses green silicate as silicon source to carry out surface silicification modification of micron zero-valent iron, which has simple operation, low cost and is convenient for large-scale production. Moreover, the prepared silicified zero-valent iron has good dispersibility, high reduction activity and strong recycling performance, and can be used for the treatment of various polluted water bodies and soil.

Abstract: The present invention belongs to the technical field of warning for petroleum pollution, and particularly provides an early warning method for vadose zone and groundwater pollution in a contaminated site. The present invention can monitor and analyze the conductivity and water content of pore water in a vadose zone in real time and determine the pollution level according to a parameter variation and an analysis on collected samples; and furthermore, the present invention can give multi-level early warnings before groundwater is polluted, accurately determine the pollution level, and provide corresponding measures in time.