4.8 Article

Start-up and microbial communities of a simultaneous nitrogen removal system for high salinity and high nitrogen organic wastewater via heterotrophic nitrification

Journal

BIORESOURCE TECHNOLOGY
Volume 216, Issue -, Pages 196-202

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.05.064

Keywords

High salinity wastewater; Heterotrophic nitrification; Bacterial community; Aerobic denitrification; Pressurized biofilm reactor

Funding

  1. National Science and Technology Major Project for Water Pollution Control and Remediation of China [2008ZX07315-004]
  2. National Natural Science Foundation of China [51278508]

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In this study, a simultaneous nitrogen removal system for high salinity and high nitrogen organic wastewater was developed in a pressurized biofilm reactor. The result showed that under the air supply rate of 200 L h (1), salinity of 3.0 +/- 0.2%, organic load of 10 kg COD m (3) d (1) and nitrogen loading of 0.185 kg m (3) d (1), the reactor started up rapidly and performed stably after 30 days operation. Meanwhile, a simultaneous COD and nitrogen removal was achieved in the single-stage reactor, with COD, NH4+-N and TN removal efficiency of 97%, 99% and 98%, respectively. Denaturing gradient gel electrophoresis profile demonstrated that simultaneous nitrogen removal could be achieved through heterotrophic nitrification-aerobic denitrification, and the pivotal microorganisms were Flavobacterium phragmitis and Paracoccus denitrificans. The microbial community of salt-tolerant halophilic microorganisms was developed successfully. This study can provide a more efficient and feasible solution to treat high salinity organic wastewater. (C) 2016 Elsevier Ltd. All rights reserved.

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