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Open AccessCommunication
Energies 2014, 7(9), 6186-6195; doi:10.3390/en7096186

Optimization of Alkaline Flocculation for Harvesting of Scenedesmus quadricauda #507 and Chaetoceros muelleri #862

1
School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
2
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
3
College of Engineering, China Agricultural University, Beijing 100083, China
4
School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
*
Authors to whom correspondence should be addressed.
Received: 11 June 2014 / Revised: 13 August 2014 / Accepted: 17 September 2014 / Published: 24 September 2014
(This article belongs to the Special Issue Algae Based Technologies)
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Abstract

A response surface methodology (RSM) was used to evaluate the effects of pH and microalgal biomass concentration (BC) on alkaline flocculating activity for harvesting one freshwater green algae Scenedesmus quadricauda #507 and one marine diatom Chaetoceros muelleri #862. The pH value and BC were in range of 9.0–12.0 and 0.20–2.30 g/L, respectively. Very high regression coefficient between the variables and the response indicates excellent evaluation of experimental data by second-order regressions. Optimum conditions for flocculating activity were estimated as follows: (i) pH 11.6, BC 0.54 g/L for strain #507 and (ii) pH 11.5, BC 0.42 g/L for strain #862. The maximum flocculating activity was around 94.7% and 100%, respectively. Furthermore, the addition of synthetic ocean water (SOW) to the freshwater #507 culture can increase the flocculating activity from 82.13%–88.79% in low algae concentration (0.52 g/L) and 82.92%–95.60% in high concentration (2.66 g/L). View Full-Text
Keywords: microalgae harvesting; flocculation; alkaline; response surface methodology; synthetic ocean water microalgae harvesting; flocculation; alkaline; response surface methodology; synthetic ocean water
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MDPI and ACS Style

Huo, S.; Wang, Z.; Zhu, S.; Cui, F.; Zou, B.; You, W.; Yuan, Z.; Dong, R. Optimization of Alkaline Flocculation for Harvesting of Scenedesmus quadricauda #507 and Chaetoceros muelleri #862. Energies 2014, 7, 6186-6195.

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