Microalgae cultivation and culture medium recycling by a two-stage cultivation system
Xinfeng Wang1,2,3, Lu Lin3, Haifeng Lu1(), Zhidan Liu1, Na Duan1, Taili Dong4, Hua Xiao5, Baoming Li1,2(), Pei Xu3
1. Laboratory of Environment-Enhancing Energy (E2E), Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture, College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China 2. Beijing Engineering Research Center for Animal Healthy Environment, Beijing 100083, China 3. Department of Civil Engineering, New Mexico State University, Las Cruces, NM 88003, USA 4. Shandong Minhe Biotechnology Limited Company, Yantai 265600, China 5. School of Engineering, Cardiff University, Queen's Building, Cardiff, CF24 3AA, UK
A two-stage system was designed for microalgae cultivation and nutrients removal.
Two species of microalgae were cultivated for biomass production.
UF costed less than centrifuge for harvesting microalgae at small scale.
100% NH4+ of the wastewater was removed and met discharge requirement.
Nutrients and water play an important role in microalgae cultivation. Using wastewater as a culture medium is a promising alternative to recycle nutrients and water, and for further developing microalgae-based products. In the present study, two species of microalgae, Chlorella sp. (high ammonia nitrogen tolerance) and Spirulina platensis (S. platensis, high growth rate), were cultured by using poultry wastewater through a two-stage cultivation system for algal biomass production. Ultrafiltration (UF) or centrifuge was used to harvest Chlorella sp. from the first cultivation stage and to recycle culture medium for S. platensis growth in the second cultivation stage. Results showed the two-stage cultivation system produced high microalgae biomass including 0.39 g·L−1Chlorella sp. and 3.45 g·L−1S. platensis in the first-stage and second-stage, respectively. In addition, the removal efficiencies of NH4+ reached 19% and almost 100% in the first and the second stage, respectively. Total phosphorus (TP) removal reached 17% and 83%, and total organic carbon (TOC) removal reached 55% and 72% in the first and the second stage, respectively. UF and centrifuge can recycle 96.8% and 100% water, respectively. This study provides a new method for the combined of pure microalgae cultivation and wastewater treatment with culture medium recycling.
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