Environmental Engineering Reference
In-Depth Information
FIGURE 22.4
Case. study.. The. regeneration. of. a. contaminated. canal. and. brownield. land. site. to. create. an.
urban.ecology.park.
FIGURE 22.5
The. brownield. restoration. site,. outlined. with. derelict. canal. shown. beneath. (www.google.
com).
use. of. the. land. within. an. urban. residential. area.. Approximately. 6.4.ha. of.
brownield.land.consists.of.former.industrial.land,.a.landill.site,.and.a.sec-
tion.of.derelict.canal.(Figure.22.5).
The.derelict.canal.contained.sediment.consisting.of.a.wet,.black,.odorous.
and.oily.mud,.approximately.1.5-1.7.m.deep..This.contained.a.wide.range.of.
elevated.contaminants.(Table.22.2).that.were.largely.immobile.in.the.anoxic.
conditions. and. stable. pH. (about. 5.7). of. the. sediment.. However,. the. canal.
and.embankments.did.support.a.rich.diversity.of.vegetation,.invertebrates,.
and.nesting.birds.(Figure.22.6)..Once.exposed.to.the.atmosphere,.the.chem-
istry.of.the.sediment.changes.and.contaminants.become.extremely.mobile;.
bioavailable.metal(loid)s.then.account.for.as.much.as.40%.of.the.total.con-
centrations..The.driver.for.the.project.was.largely.based.on.the.fact.that.the.
canal.has.become.derelict.and.the.sediment.is.drying.out,.thus.potentially.
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