Abstract
The vertical2flow constructed wetland which was in the base of gravel2 Canna indica was designed and applied to purify wastewaters for reusing in the culture of Clarias f uscus. Observations were taken on parameters of water quality during breeding Clarias f uscus. The results showed that the planted constructed wetland had considerably effective purification in water body of aquaculture. The average removal rate of BOD5 ,COD ,and TN of wastewaters during breeding periods was 81177 % ,55155 % ,and 65 % respectively. After being purified ,the water quality partly accorded with the National Standard of Fishery Water Quality ,and the culture water could be recycled. However ,because there was no treatment in the control pond ,BOD5 ,COD and TN increased continually. The turbidity degree was obviously higher than that in the experimental pond. Algae bloomed in the control pond. This study demonstrated the advantage for planted constructed wetlands which were simple mechanisms and easily generalized to treat2 ment of wastewaters in circulating aquaculture.
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