| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 95 === A suspension adsorbent absorbent made from oyster shells powder was developed for the absorption of heavy metals in rivers. Wasted oyster shells were collected from the roadside at Chia-I County, and these shells were crushed and sieved into five fractions. Chemical and physical properties of the five sieving fractions are analyzed by sedimentional test, XRF, BET analyzer at first.
Experimental results indicate that the fraction with 37μm has the highest surface area (6.93m2/g) and CaCO3 content.(90%) There heavy metals, Pb, Cd and Cr; were used for the absorption test of the prepared oyster shells. Results show that 96% of Cd can be removed within 2 h by 74μm and 37μm fractions. And Ca 100% of Cr can be removed after 16h. The percentages of suspension ability are 0.42% for 149um sieving fraction, 0.27% for 104 μm sieving fraction, and 0.30% for 37μm sieving fraction.
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