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A new nitrogen management system in water/wastewater treatment  

【ENERGY】 Terada Team

  • Overview

    To ensure sufficient amount of freshwater resource in the 21st century, reclamation of used water, resource recovery and energy harvesting from used water streams have become more important. Recently, water generated after human activities is not called “wastewater” anymore but “enriched” and/or “resource” water, potentially possessing resources and energy. Given the paradigm shift from removing contaminants in wastewater streams to harvesting energy/resources, of importance are to discover novel microorganisms and to promote an innovation allowing efficient energy/resource recovery. The research team aims at development of a management system of nitrogen, which mainly causes water pollution and greenhouse gas emissions, based on the concepts of energy-saving and energy/resource recovery.

  • Approaches

    In wastewater streams, there exist various forms of nitrogen compounds, which are transformed into nitrogen gas by multiple reactions mediated by different microorganisms. For removal of nitrogen compounds, substantial amount of energy has been provided. We explore ways to turn such an energy-intensive nitrogen-removing technology into energy/resource recovery counterparts. Concretely, we tackle on (1) development of a cost-effective nitrogen removal technology achieving high rate conversion and low emission of greenhouse gas, i.e. nitrous oxide (N2O), (2) exploration of novel microorganisms and understanding of their potentials for energy recovery and protein production, and (3) development of an energy harvesting technology by accumulating N2O.

  • Plan

    1. Acceleration of partial nitritation-anammox reaction
    Partial nitritation-anammox is of promise as an energy-saving and cost-effective nitrogen removal process. This work package focuses on comprehensive understanding of physiology and phylogeny of bacteria responsible for partial nitritation and anammox. Furthermore, bacteria producing and consuming N2O are explored.

    2. Exploration of novel N2O-assimilating algae and application to a resource recovery system
    Freshwater N2O-assimilating algae are enriched and isolated. Their physiological potentials for production of valuable compounds are investigated.

    3. Energy recovery based on N2O
    It has been perceived that N2O is a nitrogen compound to be reduced. On the contrary, it could be an excellent combustion gas for CH4. A way to attain high N2O yield during nitrogen conversion is investigated.

    4. Protein recovery from nitrogen-enriched water
    Exploration of bacteria synthesizing protein from ammonia in wastewater is performed.

Team Head

International Researcher(s)

Kartik Chandran

Affiliation Columbia University(U.S.A.)
Division / Department Department of Earth and Environmental Engineering
Position Professor
URL

http://www.columbia.edu/~kc2288

Sukhwan Yoon

Affiliation Korea Advanced Institute of Science and Technology (KAIST) (Korea)
Division / Department Department of Civil and Environmental Engineering
Position Associate Professor
URL

https://www.eml.kaist.ac.kr/professor

Members

Yohey HASHIMOTO  (Institute of Agriculture / Associate Professor)
Shohei RIYA  (Institute of Engineering / Associate Professor)
Toshikazu Suenaga  (Institute of Global Innovation Research/ Assistant Professor)      (2019.04.01 – 2021.03.31)
Shohei Yasuda (Institute of Global Innovation Research / Assistant Professor)   (2021.04.01 – )

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