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Semelhante a In Situ Remediation Basics
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In Situ Remediation Basics
- 16. Direct Push (Geoprobe) Injection
Notas do Editor
- ARS Technologies 2000
- ARS Technologies 2000 For injection to be successful you need to pick the right chemistry and get good delivery of the injected fluid
- Hydrogeology: to design good delivery system Geochemistry: is the site aerobic, anaerobic Contaminants: which chemistry is best Microbial population: are the right bacteria there, are they healthy ARS Technologies 2000
- Metals: to bind up the metals so they do not migrate Petroleum VOCs: can use biodegradation, either aerobic or anaerobic; can use oxidation; can inject heat to volatilize Chlorinated VOCs: can use anaerobic biodegradation; can use oxidation; can use chemical reduction SVOCs and PCBs: typically use oxidation ARS Technologies 2000
- Successful remediation requires understanding the contaminants Define the source area, the dissolved plume, what are the concentrations Are the contaminants being degraded by native microbes, can the degradation be enhanced by injection ARS Technologies 2000
- ARS Technologies 2000 Types of in-situ remediation Chemical reduction is using zero valent iron
- Direct oxidation reduces contaminants to basic materials; water, chlorine, carbon dioxide, ethene/ethane/methane gases ARS Technologies 2000
- Chemical reduction: a patented method (by Adventus) of remediation using zero valent iron ARS Technologies 2000
- For petroleum: adding oxygen to the ground to enhance the natural bacteria that eat the hydrocarbons Oxygen release products: like ORC, PermeOx, EHC-O ARS Technologies 2000
- Sulfate reducing bacteria can reduce petroleum products Dehalogenating bacteria can break down chlorinated hydrocarbons when sufficient hydrogen is present Typical hydrogen sources are complex carbon compounds such as fatty acids, oils, sugars ARS Technologies 2000
- ARS Technologies 2000
- Objective is long-term creation of hydrogen that feeds the bacteria that will break down the contamination Sugars like molasses are inefficient sources; can take 5 times as long, and can stop degrading midway, leaving vinyl chloride behind ARS Technologies 2000
- Dehalococcoides etheneogenes (DHC) is only known halorespirer that degrades ethenes and ethanes ARS Technologies 2000
- ARS Technologies 2000