Journal
BIORESOURCE TECHNOLOGY
Volume 187, Issue -, Pages 30-36Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.03.060
Keywords
Aerobic denitrification; Accumulation of nitrite; TN removal; Immobilization; Pseudomonas stutzeri T13
Funding
- National Natural Science Foundation of China [51108120, 51478140, 51178139]
- Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, China [HC201526-01]
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The excellent removal efficiency of nitrate by the aerobic denitrifier, Pseudomonas stutzeri T13, was achieved in free cells system. However, poor nitrite reduction prevents efficient aerobic denitrification because of the nitrite accumulation. This problem could be conquered by immobilizing the cells on supports. In this study, strain T13 was immobilized by mycelial pellets (MPs), polyurethane foam cubes (PFCs) and sodium alginate beads (SABs). Higher removal percentages of TN in MP (43.78%), PFC (42.31%) and SAB (57.25%) systems were achieved compared with the free cell system (29.7%). Furthermore, the optimal condition for immobilized cell systems was as follows: 30 degrees C, 100 rpm shaking speed and pH 7. The shock-resistance of SAB system was relatively poor, which could collapse under either alkaline (pH = 9) or high rotating (200 rpm) conditions. The recycling experiments demonstrated that the high steady TN removal rate could be maintained for seven cycles in both MP and PFC systems. (C) 2015 Elsevier Ltd. All rights reserved.
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