Use of ballasted flocculation (BF) sludge for the manufacturing of lightweight aggregates.
Artificial aggregates
Ballasted flocculation
Lightweight aggregates
Sewage sludge
Journal
Journal of environmental management
ISSN: 1095-8630
Titre abrégé: J Environ Manage
Pays: England
ID NLM: 0401664
Informations de publication
Date de publication:
01 Mar 2022
01 Mar 2022
Historique:
received:
12
10
2021
revised:
19
12
2021
accepted:
21
12
2021
pubmed:
28
12
2021
medline:
27
1
2022
entrez:
27
12
2021
Statut:
ppublish
Résumé
Ballasted flocculation (BF) is an efficient way to remove the turbidity from surface water. The objective of the present study is to optimize the ballast (magnetite), coagulant (poly aluminum chloride) concentration and pH for efficient turbidity removal from surface water. To do this, the sludge produced from an optimized dose of a BF treatment was utilized for the production of lightweight (LW) aggregates by combining it with hard clay and sewage sludge. The LW aggregates were formed by means of rapid sintering in the temperature range of 1000-1200 °C with an exposure time of 10 min. The physical properties of the LW aggregates, in this case the leaching of heavy metals, the bulk density and the microstructure, were investigated. The results indicated that corresponding ballast and coagulant concentrations of 0.75 g/L and 30 mg/L (poly aluminum chloride (PAC)) resulted in the maximum removal efficiency of ≈95%. Using a mixture of BF sludge (30 wt%), dry sewage sludge (20 wt%), and hard clay (50 wt%), aggregates with a density of around 1.0 g/cm
Identifiants
pubmed: 34959062
pii: S0301-4797(21)02441-5
doi: 10.1016/j.jenvman.2021.114379
pii:
doi:
Substances chimiques
Metals, Heavy
0
Sewage
0
Water
059QF0KO0R
Clay
T1FAD4SS2M
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
114379Informations de copyright
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