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Activation of accumulated nitrite reduction by immobilized Pseudomonas stutzeri T13 during aerobic denitrification.

Abstract：

: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°C, 100rpm 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 (200rpm) conditions. The recycling experiments demonstrated that the high steady TN removal rate could be maintained for seven cycles in both MP and PFC systems.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Ma F,Sun Y,Li A,Zhang X,Yang J

doi

10.1016/j.biortech.2015.03.060

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

30-36

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(15)00392-2

journal_volume

187

pub_type

杂志文章

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