Environmental Engineering Reference
In-Depth Information
Fig. 10.1
Outline of fiber-
cement stabilized soil method
for treating high moisture content muds include sun drying, dewatering, cement-
based solidification but none of these can be seen as satisfactory (Takahashi
2006
).
This chapter describes research to develop methods to deal effectively with high
moisture content muds and sludges in order to create a re-usable resource. By add-
ing textile materials, paper shredder residue and polymer additives, the quality of
the sludges can be improved through a fibrous soil solidification method, leading to
a high quality ground material which can be recycled (Mori et al.
2003
).
The fibrous soil solidification method shown in Fig.
10.1
is a unique process
with two options for the purpose of its application. In the case that the muds to be
treated are from dredging, this process, not only treats the dredging mud (sludge),
but can also solidify it using cement solidification materials so that the treated mud
can be used as back filling material or in land reclamation. In the case of water
purification (sewage) sludges, the soil can be used as a foundation soil for planting
without solidification. With construction sludges, and with self-hardening cement
sludges, their use is limited to backfill and land reclamation materials but in the
case of non-hardening cement-containing sludges, the choice of treatment process
can be adjusted to provide either fill materials or soils for planting vegetation in
re-greening projects.
The most important feature of this method is to use textile materials or waste
paper as local sources of fibers which impart various excellent characteristics to
the sludge. This paper describes this 'fiber-solidified soil treatment method in order
to produce landfilling and reclamation materials' and the 'fiber-based treatment to
produce soils suitable for reclamation planting (greening)' in addition to providing
typical examples of their use in construction projects.
