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Humans may be exposed to lead from air pollution directly, through inhalation, or through the incidental ingestion of lead that has settled out from the air onto soil or dust. Ingestion of lead settled onto surfaces is the main route of human exposure to lead originally released into the air.
Method for treatment of lead ion heavy metal by permeation passivation
This invention discloses a method for passivating lead ions and other heavy metals through a permeation process, belonging to the field of heavy metal pollution control technology. Addressing the problems of uneven penetration, poor stability, and low utilization rate of existing lead pollution passivation technologies, this invention first pre-treats the lead-containing contaminated medium to adjust its moisture content. Then, a composite passivating penetrant is prepared by compounding phosphates, sulfides, zero-valent iron powder, and nonionic surfactants. This penetrant is injected into the medium in two stages using high-pressure rotary jet spraying, followed by controlled pressure and volume and 10-14 days of moisture retention curing. This invention improves the uniformity and utilization rate of the agent penetration through synergistic agent action and a staged injection process. After treatment, the TCLP leaching concentration of lead ions is consistently below 5 mg / L. This method is suitable for lead-containing media such as contaminated soil, sediment, tailings, and smelting waste, exhibiting high passivation efficiency, strong stability, and environmental friendliness.
Owner:SICHUAN DUMBXIANG ECOLOGICAL ENVIRONMENT TECHNOLOGY CO LTD
A medicament for reinforcing repair of lead pollution, a preparation method and a repair method thereof
This invention discloses an agent for enhanced remediation of lead pollution, its preparation method, and remediation method. The agent comprises 15-20% Penicillium chrysogenum, 10-15% Rhodotorula rubrum, 25-30% hydroxyapatite, 5-8% sodium alginate, 10-15% modified crab shell powder, and the balance being water. The preparation method includes: S1, pretreatment; S2, agent compounding and molding; S3, solidification treatment. The enhanced lead pollution remediation agent prepared by this invention can complete the remediation of contaminated soil within 7 days, reducing Pb levels. 2+ The concentration is reduced by more than 93%; and after 6 months of natural aging, the conversion rate of fixed lead is less than 5%, demonstrating highly efficient lead repair capabilities and long-lasting repair effects.
Owner:NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA