Remediation

Remediation deals with either the removal of pollution or contaminants or immobilizing such pollutants and contaminants rendering them inert. Such contaminants can be found in soil, groundwater, sediment, or surface run-off. In general, there are rigorous legislated standards that must be followed when remediating contaminated sites and brownfield sites. These standards are designed to ensure the protection of ecological receptors including humans, wildlife, plant food and all aspects of the environment.

The Sydney Steel Plant site employs two types of remediation:
Bio-remediation and Soil Solidification.

  • Bio-remediation. can be defined as any process that uses microorganisms, fungi, green plants or their enzymes to return the environment altered by contaminants to its original condition. Bio-remediation may be employed to attack specific soil contaminants, such as degradation of chlorinated hydrocarbons by bacteria. An example of a more general approach is the cleanup of oil spills by the addition of nitrate and/or sulfate fertilizers to facilitate the decomposition of crude oil by indigenous or exogenous bacteria.
  • Soil Solidification. involves mixing portland cement into contaminated media such as soil, sediment, sludge or industrial waste. Soil solidification treatment protects human health and the environment by immobilizing hazardous constituents within treated material. Contaminants are physically bound in the cement mixture and hydraulic conductivity is reduced.