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SUMMARY:Process Envelopes for and Biodegradation within Stabilised/Solidif
 ied Contaminated Soil - Reginald Kogbara\, CUED
DTSTART:20110311T160000Z
DTEND:20110311T170000Z
UID:TALK29090@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:Stabilisation/solidification (S/S)\, which usually employs cem
 entitious binders for treatment of contaminated soils\, has emerged as a c
 ost-effective and efficient remedial measure for such contaminated soils. 
 This talk presents the findings of two related studies aimed at improving 
 the robustness and sustainability of S/S technology. The first study dealt
  with development of process envelopes\, which describe the limits of oper
 ating variables for acceptable performance of S/S treated soils\, while th
 e second study dealt with facilitation of biodegradation within S/S treate
 d soils. The process envelope study utilised blended binder systems incorp
 orating cement\, fly ash\, lime and blast furnace slag\, while the combine
 d S/S and biodegradation study utilised low-pH magnesium phosphate cements
  (MPC)\, for treatment of soils contaminated by organics and heavy metals.
  The mechanical and leaching performance of the treated soils was assessed
  over time. The results of the process envelope study demonstrated that co
 mpaction around the optimum water content can be used to achieve improved 
 mechanical and leaching properties. Speciation of metal contaminants was s
 imilar in the different binder systems and leachability of metals was main
 ly pH-dependent. Hence\, the quality of immobilisation of contaminants dur
 ing S/S treatment would mainly be determined by adjustment of pH\, for met
 als\, and provision of sorption sites for organics. The combined S/S and b
 iodegradation study showed that with the appropriate magnesia content in M
 PC\, contaminant immobilisation and biodegradation can occur simultaneousl
 y without detrimental impacts on the structural integrity of the treated s
 oils. The results show considerable promise for the application of MPC in 
 contaminated land remediation.
LOCATION:Engineering Department - Lecture Room 6
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