Environmental Engineering Reference
In-Depth Information
80
Control
Limestone 3%
Sludge 3%
60
40
20
0
0
50
100
Time (days)
150
200
(a)
80
Control
Limestone 3%
Sludge 3%
60
40
20
0
0
50
100
Time (days)
150
200
(b)
FIGURE 21.9
Arsenic.concentration.in.pore.water.from.ield.experimental.plot.(a).0.3.m.depth.and.(b).0.8.m.
depth.
stabilization.. The. pH. was. 7.0. ±. 0.5. in. all. experimental. plot. pore. waters. at.
depths. of. 0.3. and. 0.8.m. indicating. that. the. pH. of. the. pore. water. was. not.
increased.by.the.lime.stone.and.mine.sludge.additives..However,.different.
arsenic. concentrations. were. observed. with. the. two. additives. (Figure. 21.9)..
Limestone.showed.low.stabilization.effects.at.both.depths..The.arsenic.con-
centration. in. the. pore. water. on. the. addition. of. mine. sludge. was. slightly.
higher.than.the.control.at.a.depth.of.0.3.m.but.the.lowest.arsenic.value.was.
observed.at.a.depth.of.0.8.m.from.mine.sludge.plot.
Summary
Stabilization.is.a.remediation.technique.that.reduces.the.mobility.and.toxicity.
of.hazardous.contaminants.in.soil.using.additives..Stabilization.is.regarded.
as.one.of.the.most.effective.and.eficient.methods.for.the.immobilization.of.
contaminant.in.waste.
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