This research prepared the tannins extract from agricultural wastes i.e. rice straw, tea
leaves, longan leaves and banana leaves with fresh water for 2 months. The highest
concentration of tannin was banana leaves (6,464.98 mg/L) followed by longan leaves
(4,478.99 mg/L), rice straw (4,000.00 mg/L) and tea leaves (1,397.95 mg/L) respectively.
Tannins extract were used for arsenic treatment in synthetic waste water. The result showed the
efficiency of arsenic removal by 10, 20, 30, 40 and 50 mg/L of tannins concentration from
banana leaves were 50.82%, 52.54%, 54.56%, 58.42% and 51.01% respectively, tea leaves
were 69.74%, 73.42%, 60.29%, 63.60% and 70.54% respectively, longan leaves were 61.03%,
56.07%, 54.36%, 40.01% and 51.80% respectively and rice straw were 53.68%, 46.70%,
55.23%, 49.22% and 54.11% respectively which indicated that there were not significantly
differed to arsenic reducing. In addition, increasing of pH in solution from 2.5 to 5.5, 6.5, 7.5
and 8.5 led to decrease of arsenic removal efficiency.
Keywords
Tannin extract, Agricultural wastes, Arsenic
INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY
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