Environmental Engineering Reference
In-Depth Information
16
Mixed Contamination of Polyaromatic
Hydrocarbons and Metals at
Manufactured Gas Plant Sites: Toxicity
and Implica
tions to Bioremediation
PalanisamiThavamani,MallavarapuMegharaj,
KadiyalaVenkateswarlu,andRaviNaidu
CONTENTS
Mixed.Contaminants........................................................................................... 347
Sites.with.Mixed.Contaminants........................................................................ 348
MGP.Sites.............................................................................................................. 350
History.............................................................................................................. 350
Typical.MGP.Process.and.the.Residuals...................................................... 350
Contaminants.of.Concern.in.MGP.Sites...................................................... 351
PAHs.and.Metals.as.Mixed.Contaminants................................................. 353
Toxicity.of.PAHs.and.Metal.Mixtures.to.Biota................................................ 355
Microbial.Mechanisms.for.Metal.Resistance................................................... 356
Microbial.Degradation.of.Organic.Pollutants................................................. 357
Direct.Microbial.Metabolism......................................................................... 357
Degradation.by.Metal-Resistant.Microorganisms..................................... 358
Inhibition.of.PAHs.Degradation.by.Metals..................................................... 359
Necessity.for.Remediation.of.MGP.Sites.......................................................... 362
Approaches.for.Remediation.of.PAHs.in.Metal-Contaminated.Systems..... 363
Conclusion............................................................................................................ 363
References............................................................................................................. 364
MixedContaminants
Any.combination.of.two.or.more.chemical.substances,.regardless.of.source.
or. of. spatial. or.temporal. proximity. that. can. inluence. the. risk. of. chemical.
toxicity. in. the. target. population,. is. deined. as. a. mixture. of. contaminants.
347
Search WWH ::
Custom Search