Journal
CHEMOSPHERE
Volume 92, Issue 10, Pages 1383-1389Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2013.05.014
Keywords
Algae-bacteria combined system; Nutrient removal; pH; Chl a; Ultrastructure
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Funding
- Program for New Century Excellent Talents in University [NECT-10-0148]
- National Natural Science Foundation of China [20877065, 21277114]
- Key Research Project for Higher School of Hunan Province [11A119]
- Research Grants Council of Hong Kong [HKBU 09]
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To achieve better removal of NH4+ and TP in wastewater, a new algae-bacteria combined system of Chlorella vulgaris and Bacillus licheniformis was investigated in a 6-d experiment. The results showed that 78% of NH4+ could be removed in the combined system, while 29% in single algae system and only 1% in single bacteria system. Approximately 92% of TP was removed in the combined system, compared with 55% and 78% in single algae and bacteria system, respectively. B. licheniformis was proven to be a growth-promoting bacterium for C vulgaris by comparing Chl a concentrations in the single and combined systems. In the removal process, pH of the combined system was observed to reduce significantly from 7.0 to 3.5. Whereas with pH regulated to 7.0, higher removal efficiencies of NH4+ (86%) and TP (93%) were achieved along with the recovery of algal cells and the increase of Chl a. These results suggest that nutrients in wastewater can be removed efficiently by the algae-bacteria combined system and pH control is crucial in the process. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
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