9 results about "Pb contamination" patented technology

The invention provides a method for improving phytoremediation of heavy metal cadmium / lead contaminated soil by using beta-cyclodextrin, and belongs to the technical field of heavy metal contaminated soil remediation. The method comprises the following steps: applying beta-cyclodextrin into the heavy metal cadmium / lead polluted soil, carrying out soil flooding treatment, and planting cadmium / lead tolerant and enriched plants; the application amount of the beta-cyclodextrin is 5-25 g / m < 2 >. According to the method, the enrichment capacity of plants to cadmium / lead is remarkably improved through beta-cyclodextrin, and test data shows that after beta-cyclodextrin is applied, the cadmium content of the roots, stems and leaves of amaranthus hypochondriacus is remarkably improved compared with that of a blank group, the repair period is greatly shortened, and the defect that traditional plant repair efficiency is low is overcome. The method has the advantages of being green, safe, easy to operate, quick in effect taking and high in practicability.

This invention discloses a bacterial strain for remediating cadmium, mercury, and lead (CdM) contaminated soil and its application, belonging to the field of environmental remediation. This invention screened a strain of Acinetobacter guillouiae FG09 from soil, capable of remediating CdM and CdM contaminated soil (CCTC NO: M 20251636). Furthermore, this invention prepared a chelating agent using extracellular polymers and glutathione from the FG09 strain, and then combined the chelating agent with the bacterial suspension of the FG09 strain to form a composition. Experimental results showed that the bacterial suspension, chelating agent, and composition all significantly reduced the CdM, mercury, and lead content in the soil; the composition showed the most outstanding removal rate of CdM, mercury, and lead in soil with heavy metal contamination, with removal rates exceeding 90% after 5 days of remediation. This invention provides a new biological material for the remediation of heavy metal contaminated soil and has significant implications for environmental protection.

The utility model discloses an adsorption device for treating lead-containing wastewater, which relates to the technical field of wastewater treatment and comprises a base, a biological treatment box is welded on the outer wall of the top of the base, a box body is welded on the outer wall of the top of the biological treatment box, the box body is matched with the biological treatment box, and a partition plate is arranged on the inner wall of the box body. The partition plate divides the inner wall of the box body into a filter cavity and a precipitation cavity, and a first filter tank, a second filter tank and a third filter tank are slidably mounted on the inner wall of the filter cavity. According to the utility model, firstly, large-particle impurities in the wastewater are removed through multi-stage filtration, and then precipitants such as lime, sodium hydroxide and sodium sulfide are added into the wastewater through a precipitation and flocculation method, so that the precipitants are combined with lead in the wastewater to generate precipitates to remove the lead in the wastewater; and finally, carrying out biological treatment on the lead-containing wastewater through sulfate reducing bacteria, iron-oxidizing bacteria and other biological bacteria, and removing lead in the wastewater as much as possible through combination of precipitation and biological treatment so as to prevent the lead in the wastewater from polluting the environment.

The invention discloses a bacterial strain for repairing cadmium, mercury and lead combined pollution in soil and application of the bacterial strain, and belongs to the field of environmental restoration. According to the invention, a strain of Acinetobacter guilluiae FG09 capable of repairing cadmium, mercury and lead pollution in the soil is screened from the soil, and the preservation number of the Acinetobacter guilluiae FG09 is CCTCC (China Center for Type Culture Collection) NO: M 20251636. The extracellular polymeric substance of the FG09 bacterial strain and glutathione are further prepared into a chelating agent, and the chelating agent and bacterial liquid of the FG09 bacterial strain are compounded into the composition. Experimental results show that the bacterial liquid, the chelating agent and the composition can significantly reduce the content of cadmium, mercury and lead in soil; the removal rate of the composition on cadmium, mercury and lead in the heavy metal combined polluted soil is the most prominent, and the removal rate of cadmium, mercury and lead treated by the composition exceeds 90% after five days of remediation. The invention provides a new biological material for the remediation of the heavy metal contaminated soil, and has great significance for environmental protection.

The invention is applicable to the technical field of contaminated soil remediation, and provides a device and method for remedying lead-contaminated soil through series electrodynamic force, and the device comprises an electrochemical remediation soil reaction device with a mixed electrolysis chamber arranged in the middle; the soil chambers are arranged on the two sides of the electrochemical remediation soil reaction device, and permeable reactive barrier chambers are arranged between the soil chambers and the mixed electrolysis chamber; the anode electrolysis chamber and the cathode electrolysis chamber are arranged at the two ends of the electrochemical remediation soil reaction device, and a permeable reactive barrier chamber is arranged between the soil chamber and the cathode electrolysis chamber; the perforated isolation plates are positioned between the soil chamber and the permeable reactive barrier chamber, between the soil chamber and the anode electrolysis chamber, between the soil chamber and the mixed electrolysis chamber, between the permeable reactive barrier chamber and the cathode electrolysis chamber and between the permeable reactive barrier chamber and the mixed electrolysis chamber, and the outer surfaces of the perforated isolation plates are coated with filter paper. Through a series device assisted by the permeable reactive barrier, the direct-current voltage applied in the repairing process is effectively reduced, the safety is improved, and other direct-current power supplies capable of providing low voltage can be conveniently used; meanwhile, the permeable reactive barrier with lead adsorption capacity is used for locking lead ions migrating in the soil and preventing the lead ions from entering the mixing electrolysis chamber, so that the influence of the lead ions on the removal of the lead ions by a downstream device is avoided, the effective operation of the series experiment device is ensured, the lead element is convenient to recycle, and the cost is reduced. And array work of breaking up the whole into parts can be achieved in the size amplification process of the remediation device, and it is ensured that soil remediation is completed safely and efficiently.

The present application belongs to the technical field of heavy metal pollution treatment, and relates to a preparation method and application of a heavy metal contaminated soil remediation agent. The heavy metal contaminated soil remediation agent mainly comprises the following components in parts by weight: alkali modified cotton stalk biochar 20-30 parts, sepiolite 5-10 parts, humic acid 15-20 parts, and calcium silicate 5-10 parts. The heavy metal contaminated soil remediation agent can effectively remove mercury, arsenic, cadmium and / or lead pollution in heavy metal contaminated soil, and improve the heavy metal contaminated soil environment. After the soil remediation agent is used to treat heavy metal cadmium contaminated soil, the soil pH value can be improved, and the absorption and enrichment of crops to cadmium and lead can be reduced, so that a new type of biological remediation method with low cost, high efficiency, simplicity and environmental friendliness is provided.

The application discloses a MnOx biochar cathode bioelectrochemical system for repairing lead and cadmium contaminated soil and application, which comprises an anode and a MnOx modified biochar cathode. 2+ , Cd 2+ electrons are used as direct electron acceptors instead of oxygen, the cathode area is expanded by using biochar, and the internal electric field strength of the bioelectrochemical system is increased, so that the effective repair of heavy metals in soil is promoted. The electron flow and electric field generated by the system itself are source power, which drives the migration, transformation and concentrated removal of heavy metals, realizes that the power generation directly contributes to the removal of heavy metals, and does not need external energy input. Meanwhile, the system has good repair effect on lead contaminated soil, cadmium contaminated soil and lead and cadmium combined contaminated soil.

The application belongs to the technical field of heavy metal pollution treatment, and relates to a preparation of a weak alkaline soil cadmium passivator and a method for passivating soil lead. The weak alkaline soil cadmium passivator mainly comprises the following components in parts by weight: graphene oxide modified biochar 20-30 parts, montmorillonite 5-10 parts, bentonite 5-10 parts and microbial inoculum 5-10 parts, wherein the microbial inoculum is a composite inoculum composed of Bacillus subtilis, Bacillus amyloliquefaciens, Bacillus thuringiensis and Pseudomonas nitroreducens. The weak alkaline soil cadmium passivator has a good repairing effect on cadmium and lead in contaminated soil, can significantly improve the physicochemical properties of cadmium and / or lead contaminated soil, increase the soil organic matter content, reduce the migration in the environment, reduce the cadmium content in crops, and has great market promotion value.

The invention belongs to the technical field of agricultural biology, and particularly discloses application of mannose in enhancing plant lead tolerance and repairing lead-polluted soil. It is found for the first time that the tolerance of plants to lead stress can be remarkably improved by exogenously adding mannose, and lead-polluted soil is repaired. Mannose is prepared into a mannose aqueous solution, and the mannose aqueous solution is applied to the lead-polluted soil. An arabidopsis thaliana model proves that the mannose aqueous solution realizes a dual defense mechanism of synergistically activating plant chelation isolation and antioxidation. Under the stress of 300 [mu] M lead nitrate, the fresh weight and root length of arabidopsis thaliana are increased through mannose aqueous solution treatment, and leaf chlorosis and root inhibition caused by lead are reversed. The invention provides a technical scheme for solving the problems of high cost, high secondary pollution risk and the like of the existing lead-polluted soil remediation technology. By enhancing the tolerance mechanism of plants, the environmental risk of a chemical chelating agent is avoided, the method is suitable for ecological restoration of the lead-polluted soil, and a new scheme and technical support are provided for ecological restoration of the lead-polluted soil.