Authors: Chaofan Zhang Xiansheng Wang Yao Wang Yunbao Li Dandan Zhou Yanwu Jia
Publish Date: 2016/04/22
Volume: 100, Issue: 12, Pages: 5653-5660
Abstract
The high energy input required for harvesting microalgae means that commercial production of microalgal biodiesel is economically unfeasible In this study we investigated the flocculation efficiency and synergistic mechanisms of novel coupled flocculants AlCl3 and compound bioflocculants CBF to overcome this difficulty AlCl3 flocculation was found to be very sensitive to pH and flocculation efficiency increased from 55 to 95 when pH increased from 4 to 10 CBF was environmental friendly less reliant on pH but had a relatively low flocculation of 75 in optimum conditions The harvesting efficiency of Chlorella regularis can achieve a satisfactory level of 9677 even in neutral conditions with a CBF dosage of 026 g/L AlCl3 dosage of 018 g/L and coagulant aid CaCl2 dosage of 012 g/L Interestingly compared with the use of single flocculant the dosage of CBF AlCl3 and coagulant aid CaCl2 were reduced by about 52 49 and 66 respectively Besides the aluminum Al ion content of the supernatant decreased significantly to a residue of only 003 mg/L therefore meeting the downstream process needs easily Patching and bridging played key roles in coupled flocculant flocculation in which AlCl3 mainly carried out the electrical neutralization This work provides new insight into an efficient economical and environmentally friendly protocol for microalgae harvestingThe authors are grateful for the financial support from the National Natural Science Foundation of China NSFC NO 51578117 the Development Plan Project of Science and Technology of Jilin Province 20140101006JC and the Fundamental Research Funds for the Central Universities 2412016KJ011 Moreover we appreciate the Rhizobium radiobacter F2 and Bacillus sphaeicus F6 strain supplied by the Heilongjiang Environmental Biotechnology Key Laboratory of ChinaThis study was funded by the National Natural Science Foundation of China No 51578117 the Development Plan Project of Science and Technology of Jilin Province 20140101006JC and the Fundamental Research Funds for the Central Universities 2412016KJ011
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