期刊
CHEMOSPHERE
卷 186, 期 -, 页码 977-985出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.07.160
关键词
Carbon dioxide; Chlorella vulgaris; Specific growth rate; Nutrient removal; Wastewater treatment
资金
- Shenzhen Basic Research Program [JCYJ20160331185226856]
- PhD Start-up Fund of National Science Foundation of Guangdong Province, China [2016A030310024]
- Science and Technology Project of Guangdong Province [2015A010106002]
- Committee of Science and Technology Innovation of Shenzhen [JCYJ20150320154458994]
- Development and Reform Commission of Shenzhen Municipality (urban water recycling and environment safety program)
In this study, Chlorella vulgaris (C vulgaris) were cultured in cell culture flask supplied with intermittent CO2 enriched gas. The impact of CO2 concentration (from 1% to 20% v/v) on the growth of C vulgaris cultured in domestic wastewater was exploited in various perspectives which include biomass, specific growth rate, culture pH, carbon consumption, and the removal of nitrogen and phosphorus compounds. The results showed that the maximum microalgal biomass concentration, 1.12 g L-1, was achieved with 10% CO2 as a feed gas. At 20% CO2 the growth of C vulgaris suffered from inhibition during initial 1.5 d, but acclimated to low pH (6.3 in average) with relatively higher specific growth rate (03-0.5 d(-1)) during subsequent culture period. After the rapid consumption of ammonium in the wastewater, an obvious decline in the nitrate concentration was observed, indicating that C vulgaris prefer ammonium as a primary nitrogen source. The total nitrogen and phosphorus decreased from 44.0 mg L-1 to 2.1 -5.4 mg L-1 and from 5.2 mg L-1 to 0-0.6 mg L-1 within 6.5 d under the aeration of 1-20% CO2, respectively, but no significant difference in consumed nitrogen versus phosphorus ratio was observed among different CO2 concentration. The kinetics of nutrients removal were also determined through the application of pseudo first order kinetic model. 5-10% CO2 aeration was optimal for the growth of C vulgaris in the domestic wastewater, based on the coupling of carbon consumption, microalgal biomass, the nutrients removal and kinetics constants. (C) 2017 Elsevier Ltd. All rights reserved.
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