The domestic wastewater treatment capacity of Spirulina platensis SP4 and the application of the treated wastewater in stimulating rice germination

Nguyen Thi Kieu Oanh, Duong Thi Thuy, Doan Thi Oanh, Vu Thi Nguyet, Nguyen Van Nam
Author affiliations

Authors

  • Nguyen Thi Kieu Oanh Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam
  • Duong Thi Thuy Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam
  • Doan Thi Oanh Hanoi University of Natural Resources and Environment, 41A Phu Dien Road, Bac Tu Liem District, Hanoi, Vietnam
  • Vu Thi Nguyet Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam
  • Nguyen Van Nam Hanoi Architectural University, km10 Nguyen Trai Road, Thanh Xuan District, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/1811-4989/16871

Abstract

Many scientists are interested in microalgae and cyanobacteria because of their richness in high-value bioactive metabolites (proteins, lipids, vitamins, plant growth regulators, and others). Microalgae and cyanobacteria can be used to produce valuable commodities such as dietary supplements, biofuel, animal feed, and agricultural fertilizer, etc. To improve the economic feasibility of the cyanobacterial product recovery process, it is possible to utilize domestic wastewater as a source of nutrients for their growth. This research focuses on assessing the ability of domestic wastewater treatment and treated domestic wastewater utilization to stimulate BC15 rice-grain sprouting by cyanobacteria Spirulina platensis SP4. Research results showed that S. platensis SP4 grown best in domestic wastewater at the initial density of 0.3 and the wastewater concentration of 100%. The incubation of S. platensis was performed in the laboratory under the condition of 16.8 g/L NaHCO3; aeration during 8 h/day; light: dark cycle of 8:16; light intensity of 5000 lux. Under these conditions S. platensis SP4 could treat N-NH4+, T-N, P-PO43-, T-P and COD well with the treatment efficiency of 96.37, 49.71, 67.05, 65.88 and 95.53%, respectively. The addition of treated domestic wastewater by S. platensis SP4 to BC15 rice grains stimulated the grouting by 99.54 ± 1.25%, which was 1.54 times higher than using the tap water and gave a germination efficiency equivalent to that of the experiments with adding cyanobacteria in standard medium with or without L-tryptophan addition for 48 h. The obtained research results have elucidated the feasibility of employing cyanobacteria in residential wastewater treatment as well as the reuse of treated wastewater for plant development.

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Published

28-12-2022

How to Cite

Thi Kieu Oanh, N., Thi Thuy, D., Thi Oanh, D., Thi Nguyet, V., & Van Nam, N. (2022). The domestic wastewater treatment capacity of Spirulina platensis SP4 and the application of the treated wastewater in stimulating rice germination. Vietnam Journal of Biotechnology, 20(4), 773–784. https://doi.org/10.15625/1811-4989/16871

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