Astaxanthin biosynthesis from simultaneous N and P uptake by the green alga Haematococcus pluvialis in primary-treated wastewater |
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| Affiliation: | 1. Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea;2. School of Chemical and Biological Engineering, Seoul National University, Seoul 151-744, Republic of Korea;1. State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, PR China;2. Jiaxing Zeyuan Bio-Products Limited Company, Jiaxing 314006, PR China;1. Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong 266101, PR China;2. Lab of Bioengineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, PR China;1. State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, PR China;2. Jiaxing Zeyuan Bio-products Co., Ltd., Jiaxing 314007, PR China;3. Shanghai Zeyuan Marine Bio-products Co., Ltd., Shanghai 200237, PR China;1. Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China;2. Algae Biotechnology Laboratory, School of Agriculture and Food Sciences, The University of Queensland, Brisbane, QLD 4072, Australia;3. Phycology Laboratory, Botany Department, Faculty of Science, Mansoura University, Egypt;4. Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, PO Box 156, Archerfield, QLD 4108, Australia;1. Tianjin Key Laboratory for Industrial Biological Systems and Bioprocessing Engineering, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, PR China;2. Shandong Jinjing Biotechnology Co., Ltd, Shandong 261313, PR China |
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| Abstract: | An alternative microalgal system for biological wastewater treatment is proposed for both the removal of nitrogen and phosphorus from wastewater and the production of a valuable carotenoid, astaxanthin. The system consists of sequential photoautotrophic cultivation and induction processes using the green alga Haematococcus pluvialis. The Haematococcus process was applied to primary-treated sewage (PTS) and primary-treated piggery wastewater (PTP) with serial dilution. H. pluvialis grew well on PTS and PTP diluted four-fold, resulting in the successful removal of nitrogen and phosphorus from both wastewaters. At that time, cell growth rates were comparable to those in the algal-defined NIES-C medium. Following the cultivation stage, N-deprived vegetative cells were transformed under photoautotrophic induction by continuous feeding of both CO2-mixed gas and intense light to red aplanospores with substantial astaxanthin contents. The resulting astaxanthin contents accounted for about 5.1 and 5.9% of the total biomass of the PTS and PTP cultures, respectively. Our results indicate the potential of the proposed Haematococcus process as a subsidiary wastewater treatment technology with the capability of biosynthesizing the high-value antioxidant astaxanthin. |
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