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http://dx.doi.org/10.4491/KSEE.2013.35.4.283

Analysis of Water Quality Improvement of Ceratophyllum demersum under Laboratory Condition - by Nutrients Removal Efficiency  

Ahn, Chang Hyuk (Construction Environment Research Division, Korea Institute of Construction Technology)
Joo, Jin Chul (Construction Environment Research Division, Korea Institute of Construction Technology)
Joo, Won Jung (Department of Civil & Environmental Engineering Seoul National University)
Ahn, Hosang (Construction Environment Research Division, Korea Institute of Construction Technology)
Lee, Saeromi (Construction Environment Research Division, Korea Institute of Construction Technology)
Oh, Ju Hyun (Construction Environment Research Division, Korea Institute of Construction Technology)
Song, Ho Myeon (Construction Environment Research Division, Korea Institute of Construction Technology)
Publication Information
Journal of Korean Society of Environmental Engineers / v.35, no.4, 2013 , pp. 283-288 More about this Journal
Abstract
To evaluate the ability of the submerged plant, Ceratophyllum demersum's (C. demersum) to remove nutrients and to inhibit growth of cyanobacteria, a total of 6 mesocosms were conducted in a batch reactor for 9 days. From the 84 hr of the experiment, C. demersum was stabilized and showed daily cycle trends according to changes in pH and DO levels. The concentration of nutrients, $NH_3{^+}$, $NO_3{^-}$ and $PO_4{^3}$ continuously decreased until 9 days of the experiment, with the rapid decrease in nutrient concentration for the first 24 hours. High correlation coefficient ($r^2{\geq}0.96$, p<0.001) between the amount of C. demersum's biomass per unit area and the nutrients removal level were derived, and greater C. demersum's biomass per unit area showed higher removal efficiency of nutrients. However, there were differences in the C. demersum's activity level between batch reactors with higher and similar density of the C. demersum, but nonetheless water purification effect appears to have a significant influence due to attached algae and microorganisms. The growth rate of harmful cyanobacteria, Microcystis aeruginosa (M. aeruginosa) with C. demersum's density of 2,500 g $fw/m^2$ (100% of cover degree) was 0.31 /day, compared to the growth rate of 0.47 /day for the control group (0% of cover degree). In terms of number of cells, the control group had 1.7 times higher number of cells than the experimental group, proving that C. demersum has the ability to inhibit the growth of harmful cyanobacteria.
Keywords
Submerged Plant; Ceratophyllum Demersum; Nutrients Removal; Microcystis Aeruginosa; Water Quality Improvement;
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