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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 11, No. 2, 2014, pp. 233-240
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Bioline Code: st14025
Full paper language: English
Document type: Short Communication
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 11, No. 2, 2014, pp. 233-240
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Reuse of dewatered sewage sludge conditioned with skeleton builders as landfill cover material
Li, Y. L.; Liu, J. W.; Chen, J. Y.; Shi, Y. F.; Mao, W.; Liu, H.; Li, Y.; He, S. & Yang, J. K.
Abstract
High water and organic content of sewage
sludge constricts its reuse and disposal. It is often necessary
to solidify/stabilize the dewatered sludge with solidifying
agents before landfill disposal. In this study, the sewage
sludge was conditioned with skeleton builders, i.e., fly ash
and lime combined with ferric chloride for the purpose of
improving the dewatering efficiency. The dewatered sewage
sludge was then directly reused as landfill cover
materials since the skeleton builders also play a role in
solidification of sludge. The geotechnical properties of the
dewatered sewage sludge were investigated. The results
show that the plasticity index of the dewatered sludge
increases compared to that of the dewatered sludge without
any conditioner, and the permeability coefficient changes
from 10-8 to 10-5 cm s-1. Furthermore, the strength
of specimens increase with curing days. Microstructure
analyses reveal that the main hydrated products are calcium
silicate hydrate and ettringite, which contribute to the
solidification/stabilization of the dewatered sludge. The
results indicate that the dewatered sewage sludge conditioned
with skeleton builders can be used as landfill covers.
This study provides an alternative for traditional sewage
sludge treatment and disposal.
Keywords
Disposal; Geotechnical properties; Sludge dewatering; Soldification
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