Journal
INTERNATIONAL JOURNAL OF GLOBAL WARMING
Volume 19, Issue 1-2, Pages 145-157Publisher
INDERSCIENCE ENTERPRISES LTD
DOI: 10.1504/IJGW.2019.101778
Keywords
bioremediation; minkery wastewater; water pollution; wastewater treatment; Haematococcus pluvialis; algal biomass; astaxanthin; photoautotrophy; mixotrophy; nutrient deprivation; nutrient stress; light stress; surface response methodology; Nova Scotia
Categories
Funding
- Nova Scotia Department of Agriculture
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A two-stage system was designed for culturing and induction processes of H. pluvialis. H. pluvialis was cultivated in minkery wastewater and compared with the conventional Bold's basal medium, and grew better in diluted (1.5%) minkery wastewater, yielding a biomass production of 906.3 +/- 34.0 mg L-1. Total nitrogen and total phosphorus were also removed successfully. In the following induction stage, nitrogen-deprived vegetative cells were exposed to high light intensity for astaxanthin production, and the resultant production was 39.72 +/- 1.69 mg L-1. Employing the diluted wastewater, a mixotrophic induction strategy was also tested by using a series of acetate and NaCl concentrations. The findings indicated that the optimal combination for astaxanthin production was 38.14 mM acetate and 0.58% (w/v) NaCl. And the optimal astaxanthin concentration was 67.95 +/- 3.93 mg L-1 after a 12-day induction period. This study concludes that H. pluvialis offers a potential opportunity for treating minkery wastewater and producing high-value astaxanthin.
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