Recycling of Nutrients from Dairy Wastewater by Extremophilic Microalgae with High Ammonia Tolerance
Journal Article
·
· Environmental Science and Technology
- Washington State Univ., Pullman, WA (United States)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Northwest A & F Univ., Shaanxi (China)
This study explored the possibility of incorporating extremophilic algal cultivation into dairy wastewater treatment by characterizing a unique algal strain. Results showed that extremophilic microalgae Chlorella vulgaris CA1 newly isolated from dairy wastewater tolerated a high level of ammonia nitrogen (2.7 g/L), which was over 20 times the ammonia nitrogen that regular Chlorella sp. could tolerate. The isolate was mixotrophically cultured in dairy effluent treated by anaerobic digestion (AD) for recycling nutrients and polishing the wastewater. The highest biomass content of 13.3 g/L and protein content of 43.4% were achieved in the culture in AD effluent. Up to 96% of the total nitrogen and 79% of the total phosphorus were removed from the dairy AD effluent. The ability of the algae to tolerate a high level of ammonia nitrogen suggests the potential for direct nutrient recycling from dairy wastewater while producing algal biomass and high value bioproducts.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)
- Grant/Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1755727
- Report Number(s):
- NREL/JA--2800-78276; MainId:32193; UUID:39a7df61-863d-4f5c-9880-dac8c48a4774; MainAdminID:19052
- Journal Information:
- Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 23 Vol. 54; ISSN 0013-936X
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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