Removal of eutrophication factors and heavy metal from a closed cultivation system using the macroalgae, Gracilaria sp. (Rhodophyta) |
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Authors: | Kyoung Ho Kang Zhenghong Sui |
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Institution: | 1. Department of Aquaculture, Chonnam National University, Yeosu Jeonnam, 550-749, South Korea 2. Key Laboratory of Marine Genetics and Breeding, Ministry of Education, Ocean University of China, Qingdao, 266003, China
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Abstract: | In this study, the ability of macroalgae Gracilaria sp. of removing eutrophication factors and toxic heavy metals Al, Cr, and Zn in a closed cultivation system is reported.
The results show that the concentration of the three heavy metals decreased significantly during the experimental period in
an algal biomass dependent manner. The biofiltration capacity of the alga for Al, Cr, and Zn is 10.1%–72.6%, 52.5%–83.4% and
36.5%–91.7%, respectively. Using more materials resulted in stronger heavy metal removal. Additionally, the concentration
of chl-a, TN, TP and DIN of water samples from aquariums involving large, medium, and small algal biomass cultivation increased first
and then decreased during the experiment. COD value of all three groups decreased with time and displayed algal biomass dependency:
more algae resulting in a greater COD value than those of less biomass. Furthermore, changes in COD reflect an obvious organic
particles deprivation process of algae. This is the first report on heavy metal removal effect by Gracilaria species. The results suggest that macroalgae can be used as a biofilter for the treatment of nutrient-enriched or heavy-metal
polluted water, to which an appropriate time range should be carefully determined. |
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