Environmental Engineering Reference
In-Depth Information
3
2
1
0
Untreated
Phosphate
Soil treatment
FIGURE 22.3
Change.in.As.mobility.as.affected.by.phosphate.addition.(4000.mg/kg).to.an.industrially.As.
contaminated.soil..(From.Hartley,.W..et.al.,.
Environ. Pollut
.,.157,.847,.2009.)
range.of.urban.brownield.sites,.despite.previous.identiication.of.pollutants.
and.concerns.about.contamination..Attenuation.of.metal.and.As.toxicity.has.
been. demonstrated. under. various. types. of. planted. and. natural. vegetation.
(French.et.al..2006,.King.et.al..2006,.Clemente.et.al..2008)..An.industrially.con-
taminated.site.in.North-West.England.(Lepp.and.Dickinson.2003).was.one.
of.the.most.contaminated.sites.reported.(3,238.mg.Cu.kg.
-1
,.56,250.mg.Pb.kg.
-1
.
and.15,530.mg.Zn.kg.
-1
).but.a.woodland.established.on.the.site.over.a.50.year.
period,.with.no.evidence.of.phytotoxicity.in.the.vegetation;.only.Zn.was.sig-
niicantly.bioavailable..The.site.had.stabilized,.with.minimal.transfer.of.toxic.
metals.(Pb).to.the.biotic.community..In.this.case,.there.was.very.little.public.
access.to.the.woodland,.reducing.the.possibility.of.direct.transfer.from.soil.
to.humans.
CaseStudy
An.example.of.a.brownield.restoration.project.to.evaluate.in.the.context.of.
this.chapter.is.a.recently.completed.U.K..£1.25.M.restoration.project.of.brown-
ield. land. and. a. contaminated. canal. in. Warrington,. North-West. England..
The.site.is.being.redeveloped.into.an.urban.ecology.park,.creating.a.green.
corridor. and. a. demonstration. site. for. remediation. techniques,. with. public.
recreational.access.(Figure.22.4)..The.justiication.of.the.project.was.the.man-
agement.of.contamination.risk,.based.on.earlier.published.scientiic.research.
(King.et.al..2006).combined.with.the.beneits.of.public.access.and.amenity.
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