Journal of Microbiology and Biotechnology

  • 제16권3호
  • /
  • Pages.414-422
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  • 2006
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  • 1017-7825(pISSN)
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  • 1738-8872(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
권호 표지

Characteristics of Immobilized PVA Beads in Nitrate Removal

  • Cho Kyoung-Sook (Department of Biotechnology and Bioengineering, Pukyong National University) ;
  • Park Kyoung-Joo (Department of Biotechnology and Bioengineering, Pukyong National University) ;
  • Jeong Hyun-Do (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Nam Soo-Wan (Department of Biotechnology and Bioengineering, Dong-Eui University) ;
  • Lee Sang-Joon (Department of Microbiology, Busan National University) ;
  • Park Tae-Joo (Department of Environmental Engineering, Busan National University) ;
  • Kim Joong-Kyun (Department of Biotechnology and Bioengineering, Pukyong National University)
  • 발행 : 2006.03.01
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초록

Before applying PVA bio-beads to practical biological treatment of nitrate-containing wastewater, their characteristics were examined. PVA bio-beads could steadily produce nitrogen gas from nitrate for 28 batches with 0.04 ml/l/h of the maximum gas production rate; however, the maximum gas production rate dropped remarkably thereafter with apparent deformation of beads. Addition of 2.2% solution containing 1% casamino acid, 1% yeast extract, 0.1% mineral solution, and 0.1% vitamin solution to the culture medium resulted in not only recovery of activity of deactivated beads, but also a higher rate of gas production. Calculation of economic benefit for the use of bio-beads in a long-run operation indicated that reactivation of bio-beads by chemicals had economical advantages over packing new bio-beads in the system. The continuously stirred bioreactor exhibited a satisfactory performance at HRT of 20.0 h. With a 9.5 mg $NO_{3}^{-}N/l/h$ nitrate removal rate, nitrate could completely be removed without nitrite accumulation. The use of PVA bio-beads in nitrate removal appears very promising.

키워드

참고문헌

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