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System for purifying a polluted air by using algae

  • US 6,083,740 A
  • Filed: 07/22/1998
  • Issued: 07/04/2000
  • Est. Priority Date: 02/12/1998
  • Status: Expired due to Fees
First Claim
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1. A system for purifying a polluted air containing carbon dioxide and at least one of nitrogen oxide and sulfur oxide by using Spirulina as algae, said system comprising:

  • a culture tank filled with a culture fluid including said Spirulina;

    an air supply means for forcing said polluted air into said culture fluid to dissolve carbon dioxide and said at least one of nitrogen oxide and sulfur oxide in said culture fluid;

    a lighting means for radiating a light to said culture fluid to promote photosynthesis of said Spirulina in the presence of said carbon dioxide by the use of said at least one of nitrogen oxide and sulfur oxide as a nutrient of said Spirulina, to thereby provide a reduction of said at least one of nitrogen oxide and sulfur oxide and generation of oxygen; and

    filtering means for removing Spirulina of 300 μ

    m or more from said culture fluid, and returning a filtrate including immature Spirulina smaller than 300 μ

    m to said culture tank.

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