PMID- 20088205
OWN - NLM
STAT- MEDLINE
DCOM- 20100225
LR  - 20100121
IS  - 0959-3330 (Print)
IS  - 0959-3330 (Linking)
VI  - 30
IP  - 13
DP  - 2009 Dec 1
TI  - The effects of artificial ageing on the leaching behaviour of heavy metals in 
      stabilized/solidified industrial sludge.
PG  - 1405-13
LID - 10.1080/09593330903164536 [doi]
AB  - The use of a hydraulic binder for the treatment of mineral-based industrial 
      wastes, containing heavy metals, by the chemical fixation and solidification 
      (CFS) technique has raised serious questions regarding the prediction of the 
      behaviour of these pollutants in the obtained solid matrix. It seems necessary, 
      for this reason, to study the behaviour of these metals in response to leaching 
      in order to evaluate their chemical speciation within the solidified sludge over 
      the medium and long-terms. Within the framework of the current research, we 
      applied the CFS technique to metallic hydroxide sludge, produced by the 
      electrotyping surface treatment industry, by using Portland artificial cement 
      (PAC). Compaction at the paste phase of this treated sludge resulted in up to 35% 
      enhancement of the retention of pollutants, mainly trivalent chromium, in a 
      cementing matrix, as compared with the classical technique that uses a simple 
      vibration of sludge at the paste phase. The implemented process led to an 
      improvement in the compactness of the sludge, and thus assured a better retention 
      of heavy metals in response to the leaching of this treated sludge. The 
      evaluation of the chemical properties of the materials obtained after an 
      artificial ageing process using humidity variation cycles and thermal chocks also 
      revealed a significant improvement in the retention capacity of heavy metals in 
      the solidified sludge, which was mainly favoured by the development of 
      carbonation. In fact, the release of the heavy metals from the above mentioned 
      treated sludge was reduced by 58% for zinc and 51% for trivalent chromium after 
      the artificial ageing process.
FAU - Keskes, M
AU  - Keskes M
AD  - Research unit, Environmental Geotechnics and Civil Materials, ENIS, Sfax, 
      Tunisia.
FAU - Choura, M
AU  - Choura M
FAU - Rouis, J
AU  - Rouis J
LA  - eng
PT  - Journal Article
PL  - England
TA  - Environ Technol
JT  - Environmental technology
JID - 9884939
RN  - 0 (Metals, Heavy)
RN  - 0 (Sewage)
RN  - 0 (Water Pollutants, Chemical)
SB  - IM
MH  - Humidity
MH  - Hydrogen-Ion Concentration
MH  - Metals, Heavy/*chemistry
MH  - *Sewage
MH  - Temperature
MH  - Time Factors
MH  - Water Pollutants, Chemical/*chemistry
MH  - Water Purification/*methods
EDAT- 2010/01/22 06:00
MHDA- 2010/02/26 06:00
CRDT- 2010/01/22 06:00
PHST- 2010/01/22 06:00 [entrez]
PHST- 2010/01/22 06:00 [pubmed]
PHST- 2010/02/26 06:00 [medline]
AID - 10.1080/09593330903164536 [doi]
PST - ppublish
SO  - Environ Technol. 2009 Dec 1;30(13):1405-13. doi: 10.1080/09593330903164536.