11 results about "Contaminated land" patented technology

This invention discloses a land remediation device and method, relating to the field of heavy metal contaminated land remediation technology in the advanced environmental protection industry. The device comprises a vehicle and a rotary tiller. A mounting frame is fixedly connected to the side wall of the rotary tiller, and two symmetrically arranged movable frames are connected to the side wall of the mounting frame via a first reset mechanism. A downwardly inclined shovel plate is fixedly connected to the side wall of each movable frame, and two inclined guide plates are fixedly connected to the side wall of the shovel plate. This land remediation device and method can transport and evenly spread broken soil. During the spreading process, reducing agents are evenly sprayed onto the soil, resulting in more uniform mixing. Simultaneously, it can cover the sprayed microbial solution, thereby improving the efficiency and effectiveness of soil remediation. Furthermore, it allows for automatic adjustment of the spraying volume based on the vehicle's movement speed, ensuring spraying effectiveness while avoiding waste of microbial solution and reducing agents.

This invention belongs to the field of bio-mineral fertilizer technology, specifically relating to a microbial liquid compound agent and bio-mineral fertilizer that combine coal gangue activation and heavy metal remediation. The microbial liquid compound agent comprises the following functional strains prepared through three-stage sequential inoculation and fermentation using electrochemical low-Hertz water: *Pseudomonas putida* (a remedial bacterium), *Azotobacter chrysogenum* (a nitrogen-fixing bacterium), *Azospirillum brasiliensis* (a growth-promoting bacterium), *Pseudomonas fluorescens* (a phosphate-solubilizing bacterium), *Bacillus subtilis* (a biocontrol bacterium), *Bacillus mucilaginosus* (a potassium-solubilizing bacterium), *Bacillus megaterium* (a silica-solubilizing bacterium), and *Trichoderma echinococcus* (a synergistic bacterium). The bio-mineral fertilizer is prepared using the aforementioned microbial liquid compound agent, with coal gangue powder as the main raw material. The scientific combination of different strains provided by this invention achieves efficient improvement of heavy metal-contaminated land and increased crop yields. Simultaneously, it transforms coal gangue into a valuable resource, solving the pollution problem caused by the large-scale accumulation of coal gangue, and possesses significant economic and social value.

The invention provides an ex-situ chemical reduction stabilization remediation method for hexavalent chromium contaminated soil, which comprises the following steps: collecting soil from a contaminated land parcel, airing, crushing, screening and uniformly mixing to obtain pretreated contaminated soil; testing the content of hexavalent chromium in the polluted soil, then adding solid calcium polysulfide into the polluted soil according to the molar ratio of the solid calcium polysulfide to the hexavalent chromium of (12-16): 1, and uniformly mixing; and after uniform mixing, spraying water into the polluted soil according to 15-20% of the total solid mass, and carrying out static maintenance. According to the stable remediation method, the remediation target value (the hexavalent chromium in the soil is lower than 5.7 mg / kg) is achieved on the third day of maintenance, the remediation effect is continuous and good, and rebounding does not occur.

The invention relates to the field of polluted land parcel restoration and treatment, and particularly discloses a solid waste cleaning effect evaluation method which comprises the following steps: S1, acquiring excavation boundary control point coordinate data and land parcel basic information of a to-be-evaluated land parcel; s2, for each evaluation unit, taking the excavation boundary control point as a core sampling point, setting an auxiliary sampling point, and determining a sampling scheme; s3, at each sampling point, collecting a soil sample in a stratified sampling manner, and performing pretreatment to obtain a to-be-detected sample; s4, performing solid waste residue and soil particle composition uniformity detection on the to-be-detected sample; s5, setting an evaluation threshold value standard, and comparing a detection result with a threshold value to judge the cleaning qualification of each evaluation unit; and S6, summarizing judgment results of all evaluation units, integrally evaluating the land parcel cleaning effect and outputting a secondary cleaning suggestion scheme. The method is easy and convenient to operate and accurate in judgment, the solid waste cleaning effect can be objectively and accurately judged, the evaluation efficiency is improved, and practicability and generalizability are high.

The invention relates to the field of soil treatment, and provides a magnetic separation construction method, system and equipment for heavy metal contaminated soil, and the method comprises the following steps: determining a contaminated land parcel, measuring pollutant data of the contaminated land parcel, and establishing a heavy metal magnetic conceptual model through the pollutant data; calculating the comprehensive magnetism of the polluted plot according to the heavy metal magnetism conceptual model, and selecting a to-be-magnetized plot according to the comprehensive magnetism; calculating the total magnetism evaluation of the to-be-magnetized land parcel, selecting a magnetism increasing agent according to the total magnetism, and calculating the agent dosage of the magnetism increasing agent; a construction task package is generated according to the agent dosage, the magnetism increasing agent and the heavy metal magnetism conceptual model, construction units are selected, and magnetic separation purification equipment is formed through the construction units; the heavy metal contaminated soil is collected, magnetic increasing and magnetic separation are conducted on the heavy metal contaminated soil through the magnetic separation purification equipment according to the construction task package, and purification of the heavy metal contaminated soil can be completed.

The present application belongs to the technical field of plant genetic engineering, and relates to a heavy metal related isoprenylated plant protein gene SsHIPP6 of sudangrass and application thereof. The sequence of the sudangrass SsHIPP6 gene is selected from the nucleotide sequence shown in SEQ ID NO:1, a complementary nucleotide sequence or a variant having >95% homology, and when overexpressed in plants, the variant can reduce the cadmium accumulation in the aboveground part by >26.9% and the cadmium accumulation in the root system by >27.4%. The gene can effectively improve the resistance of plants to cadmium stress. By overexpressing the gene, the cadmium accumulation in the aboveground part of the plant can be reduced by >26.9%, and the cadmium accumulation in the root system can be reduced by >27.4%, thereby enhancing the survival rate and growth ability of the plant in cadmium contaminated soil, providing a possibility for planting high-quality forage grass on heavy metal contaminated land, and having important significance for guaranteeing the ecological safety of agriculture and the sustainable development of animal husbandry.

This invention belongs to the field of saline-alkali land improvement technology, and discloses a system and method for constructing a physical isolation layer and in-situ regenerating a arable layer in saline-alkali land. The system integrates eight units and pioneers a "non-excavation in-situ membrane laying + simultaneous pipe laying" process to achieve a fully integrated process of "physical isolation + permeable drainage + soil improvement + field division + water and fertilizer maintenance". A closed-loop isolation system is constructed using isolation field ridges containing 15-20% quicklime and 0.6-1.5mm (lifespan over 50 years) HDPE membranes. This is combined with permeable blind pipes and a field ridge drainage system, along with drip / micro-irrigation technology and fish protein compound enzyme fertilizer with a molecular weight ≤500Da, forming a closed loop of "treatment-maintenance-yield increase". It overcomes the pain points of traditional technologies, shortens the treatment cycle by more than 80%, increases crop yield by 30-50%, saves more than 60% of water, and improves soil microbial activity by more than 25%. After improvement, the soil salinity is ≤0.1% and the pH value is 6.5-7.5. It has high desalination efficiency and stable effect, and is suitable for the improvement and cultivation of various types of saline-alkali land and heavy metal contaminated land.

The invention discloses a soil pollution abatement and remediation device for polluted land and a use method of the soil pollution abatement and remediation device, and relates to the technical field of polluted soil regeneration, a abatement box is provided with a soil conditioning system, and the soil conditioning system uses the abatement box to carry out targeted treatment on different types of pollutants and regularly monitors the remediated soil. Restorated soil is regularly monitored through the soil conditioning system, whether the content of heavy metal or organic matter in the soil is rebounded or not is analyzed, corresponding maintenance measures are taken according to the monitoring result, and if it is found that the pollutant concentration tends to rise, remediation measures can be further taken, so that the remediation effect is improved. And according to the monitoring result, the variety or dosage ratio of strains, a remediation agent or a conditioner used during large-area land remediation is adjusted, and the blended soil remediation agent is conveyed into the polluted land through a drip tube, so that the remediation work of the large-area polluted soil is specifically carried out.

The application provides application of PvEIL3a in improving heavy metal stress tolerance of plants, and relates to the technical field of genetic engineering of energy forage plants.In the application, the trait modification of switchgrass is realized by regulating a key gene of a sulfur assimilation pathway, namely, the switchgrass PvEIL3a gene; in the application, the PvEIL3a protein is overexpressed in switchgrass by using a genetic engineering method, and a switchgrass strain with enhanced nutrient transformation efficiency and enhanced heavy metal resistance is obtained, which will provide high-quality materials for the modification and efficient utilization of marginal land and the improvement of heavy metal contaminated land, and has important reference significance for improving the utilization of energy plants.

The application provides a kind of organic matter-heavy metal complex pollution in-situ synchronous remediation method and remediation agent, according to the kind and concentration of pollutant in contaminated land, contaminated land is divided into the site needing reduction repair and the site needing oxidation repair, by injecting equipment, first remediation agent is injected into the site needing reduction repair, by injecting equipment, second remediation agent is injected into the site needing oxidation repair, wherein, first remediation agent is composed of L-ascorbic acid-phosphate ester salt and biological enzyme catalyst, second remediation agent is composed of L-ascorbic acid-phosphate ester salt, biological enzyme catalyst, persulfate and ferrous sulfate, and first remediation agent and second remediation agent are easily soluble in water, with good fluidity and permeability, can quickly react with pollutants, to convert it into non-toxic substance or stable precipitate, so as to complete the in-situ synchronous remediation of contaminated land, simplify the repair process, shorten the repair period.

The utility model relates to the field of environmental protection equipment, in particular to a soil remediation device for environmental protection. The soil remediation device for environmental protection comprises a support, an upper base is installed on one side of the upper end of the support, an air cylinder frame is installed on the upper base, an air cylinder is arranged on the air cylinder frame, a rotating shaft is arranged at the output end of the air cylinder, and a drill bit is arranged at the tail end, penetrating through the upper base, of the lower end of the rotating shaft; meanwhile, a servo motor is further installed on the other side of the upper end of the support, and the output end of the servo motor is connected with the position, making contact with the upper base, of the rotating shaft through a transmission assembly. The base is arranged at the bottom end of the support, the positioning plate is installed on one side of the support, and the rotating shaft is slidably installed in the positioning plate in a limited mode. An atomization assembly is connected to the positioning plate; according to the soil remediation device for environmental protection, automatic descending drilling of polluted land can be achieved, soil remediation liquid can be injected into drilled holes, the whole soil remediation process is automatic in the whole process, manual participation is not needed, and efficiency is high.