INCUBATION OF INDIGENOUS MICROALGAE IN TREATED MUNICIPAL WASTEWATER AND A TEST OF ITS FEEDING FOR ARTEMIA
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- NISHIYAMA Masateru
- 山形大学 農学部食料生命環境学科
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- SOEDA Kei
- 山形大学 農学部食料生命環境学科
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- TAKAARA Tomoko
- 福島工業高等専門学校 都市システム工学科
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- ARICHI Hiroyuki
- 鶴岡市 上下水道部下水道課
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- WATANABE Toru
- 山形大学 農学部食料生命環境学科
Bibliographic Information
- Other Title
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- 下水処理水を基質とした処理水由来微細藻類の培養とその水産利用の検討
- ゲスイ ショリスイ オ キシツ ト シタ ショリスイ ユライ ビサイ ソウルイ ノ バイヨウ ト ソノ スイサン リヨウ ノ ケントウ
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Abstract
<p> Treated municipal wastewater (TWW) containing rich nutrients has a potential to be used for incubation of algae. For the goal to produce algae preferred by a zooplankton (Artemia sp.) which is frequently used for aquaculture of shrimps, larval and juvenile fishes, the present study tried to incubate microalgae indigenous in TWW from a municipal wastewater treatment plant in Japan without any exogenous nutrients. The incubation of TWW at 20°C achieved an active growth of microalgae, especially green algae. The dominant species were Monoraphidium sp. and Chlorococcales sp. regardless of sampling dates between August 2019 and January 2020. The concentration of Chl.a as an indicator of green algae had a significant correlation with the concentration of total dissolved nitrogen (TDN) in the initial TWW, indicating the importance to use TDN-rich TWW to obtain a large amount of microalgae biomass. When the TWW was collected in winter, the longer lag time of algal growth was observed in its incubation probably due to dormant cells in such a cold water. The algal growth in the TWW was clearly limited in the incubation at 15°C and diatoms such as Cyclotell meneghiniana and Gomphonema parvulum occupied a larger portion of the algal community after the incubation, which implies the difficulty of open-air production of microalgae relying only on the TWW as both sources of algal cells and substrates in late autumn and winter. As the final step, the microalgae recoverd from the TWW was evaluated by feeding Artemia sp. About 40% of the individuals fed with the microalgae survived for 10 days, while all of non-feeding individuals died. This was a fundamental experiment and the value of this microalgae originated from TWW for aquaculture should be examined by the further experiment of its feeding for a longer period together with nutrient analysis of the grown Artemia cells.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)
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Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 76 (7), III_131-III_139, 2020
Japan Society of Civil Engineers