Environmental Engineering Reference
In-Depth Information
graph. The statistical analysis is described in detail for response brick
compressive strength only. The analyses for the other properties such as water
absorption, shrinkage, density, shrinkage, leachate characteristics of Pb, Cd
and other toxic elements were performed in a similar manner.
3.
R
ESULTS AND
D
ISCUSSION
In this section, physico-chemical, mineralogical, morphological and
toxicity leachate characteristic of jarosite waste, CCRs and clay soil are
reported and discussed. The effect of different concentration of waste matrices
on the quality of jarosite waste composite products is also described. Statistical
analysis and mathematical modeling and optimization of jarosite waste
composite product properties were also reported and discussed for the possible
commercial exploitation.
3.1. Characteristics of Jarosite Waste and CCRs
The physical, chemical, microstructural, mineralogical, toxicity and
radioactivity properties of jarosite waste, CCRs and clay soil were analysed to
assess their characteristics and to carry out further studies towards exploring
its potential for possible utilization as an valued added raw materials for
another application. The results of each characteristic are reported and
discussed in this section in detail.
3.1.1. Physico-chemical and Micro-structural Characteristics of Jarosite
Waste and CCRs
Table 3 shows the particle size variation of jarosite (D
50
= 3.91 ± 0.03 µm)
to that of
CCRs (D
50
= 100µm).
Results revealed that jarosite waste has ~ 63.5
% silt sized and 32 % clay sized particles. However, CCRs have 64.7% sand
sized particles and ~ 29 % silt sized particle. In jarosite waste, about 90% of
particles are ~ 16 µm
in size. The particle size of jarosite was finer than that of
CCRs. Figure 4 shows the particle size distribution of jarosite waste and
CCRs. The arithmetic average used for graphical representation shown in a
linear scale. The presentation in a logarithmic scale is based on the geometric
average where Q3 (x) indicates the normalized fraction (cumulative
distribution) of particles which are smaller than the grain size x. However, q3
(x) shows the volume density fraction curve (distribution density). As per the
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