Applicability of Recycled Medium Derived from Waste Water of Seafood Processing to Culturing Oil-producing Phytoplankton

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  • 水産加工場廃液由来のリサイクル培地による 燃料油生産可能な植物プランクトン培養への適用可能性
  • スイサン カコウジョウ ハイエキ ユライ ノ リサイクルバイチ ニ ヨル ネンリョウユ セイサン カノウ ナ ショクブツ プランクトン バイヨウ エ ノ テキヨウ カノウセイ

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Abstract

Growth characteristics of oil-producing phytoplankton, Nannochloropsis sp., were studied to develop a mass culture system using recycled medium（RM）as a nutrient source. The RM solution was made of decomposed waste water after seafood processing. At the start（30 days）of the waste water decomposition experiment in a 200-L tank, concentrations of organic matter in terms of BOD decreased, and that of ammonium increased with time. In contrast, the ammonium concentration decreased from the middle to the end（30 days）of the decomposition experiment, with a simultaneous increase in nitrite and nitrate. This suggested that microorganisms as organic matter decomposers changed to nitrifying microorganisms after 30 days. Although the RM from the decomposition experiment enabled the growth of Nannochloropsis sp., the specific growth rate（ μ＝ 0．66±0．08d－1）and the maximum cell abundance（0．2－1．4×107cells mL－1）in the growth experiment using the RM were slightly lower than those using f/2－Si. With the improved RMmet, which was made by adding trace metal solution, the same as in f/2－Si, to the RM, the growth potential（ μ : 0．95－1．24d－1 ; maximum cell abundance : 2．3－3．7×107cells mL－1）was the same or higher than that of f/2－Si. The RMmet with further improvements is a cost-effective method for mass culturing phytoplankton compared with artificial medium such as f/2－Si.

Journal

  • Bulletin on Coastal Oceanography

    Bulletin on Coastal Oceanography 56 (2), 115-122, 2019

    Coastal Oceanography Research Committee, the Oceanographic Society of Japan

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