Auto-flocculation through cultivation of Chlorella vulgaris in seafood wastewater discharge: Influence of culture conditions on microalgae growth and nutrient removal

Removal of Nutrients from Fertilizer Plant Wastewater Using Scenedesmus sp.: Formation of Bioflocculation and Enhancement of Removal Efficiency

“…Previous studies have reported that the green algae C. vulgaris and S. obliquus could be used to remove PO 3− 4 from the difference of wastewaters [15,34,35,37]. Other studies suggested that the immobilized or flocculated form of microalgae is more effective than free form for nutrient removal in wastewater treatment [13,15,35,38]. Our results are consistent with Nguyen et al [13] that bioflocculation formation of microalgae enhanced nutrient removal from wastewater effluent.…”

“…At the end of treatment, the two treatments with the most senior flocculation activities produced the most top elimination of nutrients, as well as COD and BOD 5 . Similarly, higher removal percentages of nitrate, phosphates, and COD were reported to associate with bioflocculation process of microalgae [13,18,19,38]. In general, algal cell density in flocculation forms is always higher than free forms [20,21].…”

“…Nguyen et al [38] investigated the ability to removal of COD and BOD 5 in seafood wastewater; results indicated that the removal rates of COD and BOD 5 were 88% and 81%, respectively, under sunlight mode and 81% and 74% under fluorescent illumination, respectively, as clear formation of flocculation was observed. Previous studies reported that the presence of microalgae in the cultivation medium had increased the consumption of organic as well as inorganic matters [11,38,39]. Besides, Wang et al [28] reported that two different metabolic pathways, i.e., heterotrophic and autotrophic growth of algae under different culture conditions.…”

“…e flocculation was exceptionally high in the treatment with 40 and 60 mg/L of microalgae biomass. Nguyen et al [38] observed that the AFL occurs when introducing the microgreen algae C. vulgaris in seafood wastewater after 8 days. AFL indicates the cell aggregation and adhesion of cells to each other in liquid culture.…”

Cultivo de >i<Chlorella sorokiniana>/i< em mistura de esgoto sanitário e suíno e separação da biomassa por sedimentação e flotação por ar dissolvido (FAD)

“…Outros parâmetros operacionais também podem influenciar os métodos de separação da biomassa e a qualidade final do efluente: tipo de coagulante (orgânico, inorgânico) combinado com o pH (CASSINI et al, 2017), tempo de detenção hidráulico no FBR (ELAWWAD; KARAM; ZAHER, 2017; SHCHEGOLKOVA et al, 2018), concentração inicial de microalgas (NGUYEN et al, 2019a) e condição de iluminação (lâmpada fluorescente, luz solar) (NGUYEN et al, 2019b). Portanto, a otimização das condições operacionais do fotobiorreator e dos métodos de separação para cada tipo de efluente é claramente necessária.…”