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| The short-term (5d) and long-term (30d) biodegradation behaviours of black wattle, bayberry, valonia and chestnut tannin extracts were systematically investigated in this paper. The results indicated that all of these four vegetable tannin extracts are biodegradable although the biodegradation process might be retarded by them to some extent, owing to the inhibitory effect of tannins on the activated sludge process. Short-term biodegradabilities of the four tannin extracts were concentration-dependent. These tannin extracts could be effectively biodegraded in 5 days when their concentrations were 0.25g/L, but the biodegradation process was remarkably retarded when the concentrations of tannin extracts were increased to 5.00g/L. In general, short-term biodegradabilities of the four tannin extracts follow the sequence of valonia tannin>chestnut tannin>bayberry tannin>wattle tannin, implying that the hydrolysable tannins are easier to be biodegraded than the condensed tannins. The results of long-term biodegradation showed that all of the four vegetable tannin extracts can be completely biodegraded with the prolongation of the activated sludge process, even if they are presented in wastewater at high concentration. Therefore, the encouraging findings in this research suggest that vegetable tannin extracts are environmentally friendly leather chemicals in consideration of their biodegradability. |
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| Keywords:vegetable tannin agents,activated sludge,biodegradation |
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