Novel klebsiella sp. or candida sp. strain, and microbial fuel cell containing same

The present invention relates to: a novel Klebsiella sp. IR21 or Candida sp. IR11 strain; a composition for wastewater treatment or wastewater purification, containing the same; a method for treating or purifying wastewater by using the composition; a microbial fuel cell containing the strain; a method for producing electricity by using the microbial fuel cell; a wastewater treatment apparatus comprising the microbial fuel cell; and a method for treating or purifying wastewater by using the wastewater treatment apparatus. The novel Klebsiella sp. IR21 or Candida sp. IR11 strain of the present invention allows the purification of wastewater exhibiting a remarkably high COD value and the production of electricity to be simultaneously promoted and allows a wastewater treatment apparatus to be operated without an external power source by designing a wastewater treatment apparatus comprising a microbial fuel cell, and thus could be widely applied to more effective wastewater treatment.