Process envelopes for stabilisation/solidification of contaminated soil using lime-slag blend

Reginald Kogbara, Yaolin Yi, Abir Al-Tabbaa

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Purpose: Stabilisation/solidification (S/S) has emerged as an efficient and cost-effective technology for the treatment of contaminated soils. However, the performance of S/S-treated soils is governed by several intercorrelated variables, which complicates the optimisation of the treatment process design. Therefore, it is desirable to develop process envelopes, which define the range of operating variables that result in acceptable performance. Methods: In this work, process envelopes were developed for S/S treatment of contaminated soil with a blend of hydrated lime (hlime) and ground granulated blast furnace slag (GGBS) as the binder (hlime/GGBS = 1:4). A sand contaminated with a mixture of heavy metals and petroleum hydrocarbons was treated with 5%, 10% and 20% binder dosages, at different water contents. The effectiveness of the treatment was assessed using unconfined compressive strength (UCS), permeability, acid neutralisation capacity and contaminant leachability with pH, at set periods. Results: The UCS values obtained after 28 days of treatment were up to ~800 kPa, which is quite low, and permeability was ~10-8 m/s, which is higher than might be required. However, these values might be acceptable in some scenarios. The binder significantly reduced the leachability of cadmium and nickel. With the 20% dosage, both metals met the waste acceptance criteria for inert waste landfill and relevant environmental quality standards. Conclusions: The results show that greater than 20% dosage would be required to achieve a balance of acceptable mechanical and leaching properties. Overall, the process envelopes for different performance criteria depend on the end-use of the treated material.

Original languageEnglish
Pages (from-to)1286-1296
Number of pages11
JournalEnvironmental Science and Pollution Research
Volume18
Issue number8
DOIs
Publication statusPublished - Sep 2011
Externally publishedYes

Fingerprint

solidification
slag
Lime
Slags
Compressive Strength
lime
Binders
Solidification
stabilization
Hydrated lime
Soil
Stabilization
Soils
compressive strength
Compressive strength
Permeability
permeability
acid neutralization
Waste Disposal Facilities
Petroleum

Keywords

  • Acid neutralisation capacity
  • Blast furnace slag
  • Cadmium
  • Leaching behaviour
  • Lime
  • Nickel

ASJC Scopus subject areas

  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis
  • Pollution

Cite this

Process envelopes for stabilisation/solidification of contaminated soil using lime-slag blend. / Kogbara, Reginald; Yi, Yaolin; Al-Tabbaa, Abir.

In: Environmental Science and Pollution Research, Vol. 18, No. 8, 09.2011, p. 1286-1296.

Research output: Contribution to journalArticle

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