| Summary: | 碩士 === 國立臺灣大學 === 環境工程研究所 === 84 === Alum and PACl (Poly Aluminum Chloride) are the most widely used
coagulants in water treatment. The residual aluminum
concentration and resulting toxicity are of the important
concern. Natural polyelectrolytes, such as chitosan, provide
many advantages over the synthetic polyelectrolytes including
safety to human health, biodegradability, harmlessness to
environment. The current research investigated the feasibility
of using chitosan as coagulation aids in the water treatment.
Jar tests were performed on different synthetic media (low-high
turbidity) and a variety of parameters including turbidity, pH,
alkalinity, TOC (Total organic carbon), Micortox toxicity test
were monitored to assess the effectiveness of chitosan. It was
found that chitosan alone was not an effective coagulant in
terms of a narrow range of the dosage and the high cost.
Chitosan, however, has advantage in that it is especially
effective for highly turbid water.
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