| Summary: | 碩士 === 淡江大學 === 水資源及環境工程所 === 82 === In this study , a commercial Kaolin Clay and Lignin are
selected to make synthetic raw waters. PAC is added into rapid
mixing step and coagulate with the coagulant of
Polyaluminum Chloride (PACl) to generate synthetic sludges.
Parameters of polymer dosage and PAC dosage are involved to
investigate the dewatering characteristics and coefficients of
compressibility of PAC-laden sludges. Also the relation
between specific resistance and CST is studied. Total solids
increase with the increasing of PAC dosages. The
dewatering characterictics become worse with the increasing
of PACl dosages. There is a good result of conditioning when
the polymerdosage is 0.11％TS. In general, the specific
resistances of water treatment plant sludges are 5×10e11∼5
×10e12 (m/kg). When the PAC dosages vary from 0mg/L to
50mg/L, then specific resistances of synthetic sludges decrease
from 10×10e11 to 6×10e11(m/kg). It shows that PAC-laden
sludges have better dewatering characteris- tics than that
of water treatment plant sludges. The coefficients of
compressibility decrease with the increasing of PAC dosage.
The coefficient of compressibility of synthetic sludges is
0.76, wlile it becomes 0.62 when the PAC dosage is 75 mg/L.
It implies that the more PAC dosages added, PAC-laden sludges
become more difficult to compress. The relation between
specific resistance and CST is as follow :
specificresistance = 0.34+0.087CST(R-squared=0.97)
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