單元大綱

    • diatomaceous earth

      Diatomaceous earth is a fossil of diatom plankton, and more than 95% of its components are SiO2. It is common mud in Japan, found in paddy fields.

    • Frequency Distribution Curve

      This is the particle size distribution of diatomaceous earth. The mode diameter is 10-20 μm.

    • Aggregation experiment of diatomaceous earth with biodegradable coagulant

      We use a flocculant made from soy protein. The amount of coagulant added is 1% of the mass of diatomaceous earth.

      添加:addition　無添加:additive-free

      10sec. →20sec. →30sec.


    • Practical example: Ultra-high-speed coagulation-sedimentation equipment

      pH調整剤:pH adjuster 凝集剤:agglutinant 急速撹拌:Rapid agitation 凝集槽:agglomeration tank　緩慢撹拌:Slow agitation 沈降槽: sedimentation tank


    • Use of biodegradable flocculants

      Using conventional flocculants, SS becomes industrial waste that costs a lot of money to dispose of.

      Company A (soybean processing, West Japan)

      •Total wastewater: about 500 t/day

      •Solid waste (moisture content: approx. 50%): approx. 1 t/day

      •Treatment cost: landfill cost approx. 30 million yen/year + sewage treatment cost approx. 30 million yen/year

      Company B (surimi processing, Tohoku)

      •Total wastewater: about 500-800 t/day

      •Solid waste (moisture content: approx. 50%): approx. 5 t/day

      •Processing cost: 20,000 – 30,000 yen/t

      Company C (wheat processing, Tohoku)

      •Total wastewater: about 250 t/day

      •Solid waste (moisture content: approx. 50%): approx. 5 t/day

      •Processing cost: 20,000 – 30,000 yen/t

      Price of fishmeal for feed (1980~2010)

      The price of fishmeal, which is the main ingredient of aquaculture feed, is soaring.  We believe that if wastewater from food processing plants is treated with a safe protein-derived coagulant, the recovered SS can be used as a substitute for fishmeal.

      Coagulation treatment of wastewater from wheat gluten manufacturing plant

      Agglomeration treatment of wastewater from tofu manufacturing plants

    • Aggregation Magnetic Separation Experiment Device 1 (self-made)

      Separation of microorganisms that do not easily sink even if they aggregate

      Magnetic fine particles are mixed with aggregates and separated with a magnet

      Mechanism of increase in laser light intensity when aggregates are removed

    • Apparatus 2 for coagulation magnetic separation experiment (homemade)

      A device that measures the rate at which aggregates form interfaces and settle.