ECOSYSTEM-LEVEL WET TEST OF CAFETERIA DRAINAGE USING MICROCOSM SYSTEM

Authors

  • Kazuhito Murakami
  • Kakeru Ruike
  • Tomomi Tsuchiya
  • Kazuki Obata
  • Ryuhei Inamori
  • Yuhei Inamori

Keywords:

Microcosm, Whole effluent toxicity (WET) test, Branched-type ANOVA, Cafeteria drainage, m-NOEC

Abstract

In Japan, the introduction of the WET (Whole Effluent Toxicity) test is under processing in
consideration, but this test may be different from the actual ecosystem phenomena because it is a single species
test in spite of the natural ecosystem consists of multi species biota. In this study, we developed the WET test
using microcosm (M-WET) which is a simulated ecosystem model and consisted of several species of producer,
consumer and decomposer. Both the number of organisms as structural parameter and DO as functional
parameter after cafeteria drainage addition were analyzed by branched-type ANOVA, and the microcosm no
observed effect concentration (m-NOEC) and toxicity unit (TU) were calculated. As result, the m-NOEC of
cafeteria drainage was calculated as 5% and the TU was as 10, and assessed that the cafeteria drainage was
discharged safely. It is important to assess the complex influences of chemical agents, such as surfactants,
medicines and so on, to the environment. To conduct such comprehensive assessments, M-WET tests should be
used to examine drainage with collecting total toxicity test data through single-species tests of chemical
contaminants in environmental water.

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Published

2021-04-25

How to Cite

Kazuhito Murakami, Kakeru Ruike, Tomomi Tsuchiya, Kazuki Obata, Ryuhei Inamori, & Yuhei Inamori. (2021). ECOSYSTEM-LEVEL WET TEST OF CAFETERIA DRAINAGE USING MICROCOSM SYSTEM. GEOMATE Journal, 20(80), 68–75. Retrieved from https://geomatejournal.com/geomate/article/view/301