珪藻<i>Nitzschia palea</i>とアオコの競合特性及びLED照射を用いたシアノバクテリア<i>Microcystis aeruginosa</i>の増殖抑制効果について

Translated title of the contribution: The competition characteristic of diatom <i>Nitzschia palea</i> and water blooms and the growth inhibition effect of LED Irradiation on cyanobacteria <i>Microcystis aeruginosa</i>

渡邉 俊介, Tannen Naythen Podiapen, 糸瀬 亮太, 井芹 寧, 郝 愛民, 久場 隆広

Research output: Contribution to journalArticlepeer-review

Abstract

<p> Basic research on the occurrence and growth mechanism of cyanobacteria as well as methods to prevent growth have been studied for many years. However, excessive cyanobacteria growth is still occurring frequently in lakes and reservoirs in various places. In recent years, ecological engineering methods have been considered due to their sustainability and energy saving nature. In this study, the hypothesis of whether diatom <i>Nitzschia palea</i> has the growth inhibitory effect on <i>Microcystis aeruginosa</i> (NIES-102) and the water blooms (<i>Microcystis</i> spp. collected from the pond) will be investigated. Moreover, since the wavelength of the optimal light for algae and cyanobacteria to grow varies depending on the species, investigation of the wavelength which suppresses the growth of <i>M. aeruginosa</i> will also be carried out. This will be done in combination with using the competitive nature of <i>N. palea</i> and by using LED irradiation. The results of the empirical investigation showed that in the high nitrogen concentration conditions, the growth of <i>M. aeruginosa</i> was inhibited by the addition of <i>N. palea</i>. However, despite the addition of <i>N. palea</i> and the silicate nutrient to the water blooms collected from the pond, it was not possible to confirm the growth inhibition of the cyanobacteria bloom. In the monoculture, irradiation of blue LED causes <i>N. palea</i> to grow, while <i>M. aeruginosa</i> had suppressed growth. Also, the growth of <i>M. aeruginosa</i> was suppressed by about 78% when compared to the used of monoculture and by adding <i>N. palea</i> under the condition of irradiating yellow LED at 25°C.</p>
Translated title of the contributionThe competition characteristic of diatom <i>Nitzschia palea</i> and water blooms and the growth inhibition effect of LED Irradiation on cyanobacteria <i>Microcystis aeruginosa</i>
Original languageJapanese
Pages (from-to)III_97-III_105
Journal土木学会論文集G(環境)
Volume75
Issue number7
DOIs
Publication statusPublished - 2019

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