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Osmotic Stress on Nitrification in an Airlift Bioreactor by Ren-Cun Jin; Ping Zheng; Qaisar Mahmood; Bao-Lan Hu is a Environmental Science article available to read on EtoBox.

What is Osmotic Stress on Nitrification in an Airlift Bioreactor about?

The effect of osmotic pressure on nitrification was studied in a lab-scale internal-loop airlift-nitrifying reactor. The reactor slowly adapted to the escalating osmotic pressure during 270 days operation. The conditions were reversed to the initial stage upon full inhibition of the process. Keeping influent ammonium concentration constant at 420 mg N L(-1) and hydraulic retention time at 20.7h, with gradual increase in osmotic pressure from 4.3 to 18.8x10(5) Pa by adding sodium sulphate, the ammonium removal efficiencies of the nitrifying bioreactor were maintained at 93-100%. Further increase in osmotic pressure up to 19.2x10(5) Pa resulted in drop of the ammonium conversion to 69.2%. The osmotic pressure caused abrupt inhibition of nitrification without any alarm and the critical osmotic pressure value causing inhibition remained between 18.8 and 19.2x10(5) Pa. Nitrite oxidizers were found more sensitive to osmotic stress as compared with ammonia oxidizers, leading to nitrite accumulation up to 61.7% in the reactor. The performance of bioreactor recovered gradually upon lowering the osmotic pressure. Scanning and transmission electron microscopy indicated that osmotic stress res

Who reads Osmotic Stress on Nitrification in an Airlift Bioreactor?

Author

Ren-Cun Jin; Ping Zheng; Qaisar Mahmood; Bao-Lan Hu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-3894)

Published

2007

Language

EN

Field

Environmental Science (Physical Sciences)