TY - JOUR
T1 - Auto-flocculation through cultivation of Chlorella vulgaris in seafood wastewater discharge
T2 - Influence of culture conditions on microalgae growth and nutrient removal
AU - Nguyen, Thi Dong Phuong
AU - Tran, Thi Ngoc Thu
AU - Le, Thi Van Anh
AU - Nguyen Phan, Truc Xuyen
AU - Show, Pau Loke
AU - Chia, Shir Reen
N1 - Funding Information:
This work was supported by Funds for Science and Technology Development of University of Danang ( B2017-DN06-04 ).
Publisher Copyright:
© 2018 The Society for Biotechnology, Japan
PY - 2019/4
Y1 - 2019/4
N2 - Nowadays, the pretreatment of wastewater prior to discharge is very important in various industries as the wastewater without any treatment contains high organic pollution loads that would pollute the receiving waterbody and potentially cause eutrophication and oxygen depletion to aquatic life. The reuse of seafood wastewater discharge in microalgae cultivation offers beneficial purposes such as reduced processing cost for wastewater treatment, replenishing ground water basin as well as financial savings for microalgae cultivation. In this paper, the cultivation of Chlorella vulgaris with an initial concentration of 0.01 ± 0.001 g⋅L −1 using seafood sewage discharge under sunlight and fluorescent illumination was investigated in laboratory-scale without adjusting mineral nutrients and pH. The ability of nutrient removal under different lighting conditions, the metabolism of C. vulgaris and new medium as well as the occurrence of auto-flocculation of microalgae biomass were evaluated for 14 days. The results showed that different illumination sources did not influence the microalgae growth, chemical oxygen demand (COD) and biochemical oxygen demand (BOD) significantly. However, the total nitrogen (total-N) and total phosphorus (total-P) contents of microalgae were sensitive to the illumination mode. The amount of COD, BOD, total-N and total-P were decreased by 88%, 81%, 95%, and 83% under sunlight mode and 81%, 74%, 79%, and 72% under fluorescent illumination, respectively. Furthermore, microalgae were auto-flocculated at the final days of cultivation with maximum biomass concentration of 0.49 ± 0.01 g⋅L −1 , and the pH value had increased to pH 9.8 ± 0.1 under sunlight illumination.
AB - Nowadays, the pretreatment of wastewater prior to discharge is very important in various industries as the wastewater without any treatment contains high organic pollution loads that would pollute the receiving waterbody and potentially cause eutrophication and oxygen depletion to aquatic life. The reuse of seafood wastewater discharge in microalgae cultivation offers beneficial purposes such as reduced processing cost for wastewater treatment, replenishing ground water basin as well as financial savings for microalgae cultivation. In this paper, the cultivation of Chlorella vulgaris with an initial concentration of 0.01 ± 0.001 g⋅L −1 using seafood sewage discharge under sunlight and fluorescent illumination was investigated in laboratory-scale without adjusting mineral nutrients and pH. The ability of nutrient removal under different lighting conditions, the metabolism of C. vulgaris and new medium as well as the occurrence of auto-flocculation of microalgae biomass were evaluated for 14 days. The results showed that different illumination sources did not influence the microalgae growth, chemical oxygen demand (COD) and biochemical oxygen demand (BOD) significantly. However, the total nitrogen (total-N) and total phosphorus (total-P) contents of microalgae were sensitive to the illumination mode. The amount of COD, BOD, total-N and total-P were decreased by 88%, 81%, 95%, and 83% under sunlight mode and 81%, 74%, 79%, and 72% under fluorescent illumination, respectively. Furthermore, microalgae were auto-flocculated at the final days of cultivation with maximum biomass concentration of 0.49 ± 0.01 g⋅L −1 , and the pH value had increased to pH 9.8 ± 0.1 under sunlight illumination.
KW - Chlorella vulgaris
KW - Green energy
KW - Growth condition
KW - Nutrient removal
KW - Wastewater treatment
UR - http://www.scopus.com/inward/record.url?scp=85056201597&partnerID=8YFLogxK
U2 - 10.1016/j.jbiosc.2018.09.004
DO - 10.1016/j.jbiosc.2018.09.004
M3 - Article
C2 - 30416001
AN - SCOPUS:85056201597
SN - 1389-1723
VL - 127
SP - 492
EP - 498
JO - Journal of Bioscience and Bioengineering
JF - Journal of Bioscience and Bioengineering
IS - 4
ER -