A+ Environmental Solutions, LLC

Metals

Metals are a recirculating problem in the environment since many cannot be degraded or decomposed like many organic contaminants. Consequently, remediation should involve not only extraction but also recovery. Mining, smelting, and certain manufacturing and industrial processes leave behind waste.

Metals Remediation Processes

The metals remediation methods used by A+ Environmental Solutions, LLC (AES), range from excavation and removal, in-situ fixation (stabilization), to phytoremediation. The technology needed will depend on the site objectives and budget. There are a variety of solutions that we can explore with you.

Metals remediation consists of ex situ (above ground) and in situ (subsurface) processes. When applicable, in-situ processes are often more cost-effective and easier to implement than ex-situ processes, since in-ground treatment eliminates excavation, disposal, and/or pump-and-treat activities. One primary method of in-situ metals remediation is metals immobilization. Immobilization refers to the process of transferring aqueous phase, highly mobile metals to a solid, stable phase that becomes part of the soil. This phase transfer prevents continued migration of contaminated metals plumes and can be a permanent solution depending on the metal and site-specific geochemistry. The most common mechanisms of in-situ metals immobilization are metals adsorption to soil particles or precipitation of metal solids that are chemically fixed to soil particles. Both of these mechanisms can permanently remove metals from the aqueous phase, restoring the aquifer and the desired usability of the water.

Excavation and transportation of metals-impacted soil is another option. Factors that determine the best method include:

  • lateral and vertical extent of metal impacts;
  • concentration of metals;
  • type(s) of metals;
  • cost of disposal at appropriate, certified landfill;
  • cost of transportation of hazardous waste.

Metals in this waste include arsenic, cadmium, chromium, copper, lead, nickel, and zinc.