Bioflocculation formation of microalgae-bacteria in enhancing microalgae harvesting and nutrient removal from wastewater effluent

Thi Dong Phuong Nguyen, Thi Van Anh Le, Pau Loke Show, Thanh Thuy Nguyen, Minh Hien Tran, Thi Ngoc Thu Tran, Sze Ying Lee

Research output: Contribution to journalArticlepeer-review

123 Scopus citations

Abstract

Microalgal bacterial flocs can be a promising approach for microalgae harvesting and wastewater treatment. The present study provides an insight on the bioflocs formation to enhance harvesting of Chlorella vulgaris and the removal of nutrients from seafood wastewater effluent. The results showed that the untreated seafood wastewater was the optimal culture medium for the cultivation and bioflocculation of C. vulgaris, with the flocculating activity of 92.0 ± 6.0%, total suspended solids removal of 93.0 ± 5.5%, and nutrient removal of 88.0 ± 2.2%. The bioflocs collected under this optimal condition contained dry matter of 107.2 ± 5.6 g·L−1 and chlorophyll content of 25.5 ± 0.2 mg·L−1. The results were promising when compared to those obtained from the auto-flocculation process that induced by the addition of calcium chloride and pH adjustment. Additionally, bacteria present in the wastewater aided to promote the formation of bioflocculation process.

Original languageBritish English
Pages (from-to)34-39
Number of pages6
JournalBioresource Technology
Volume272
DOIs
StatePublished - Jan 2019

Keywords

  • Bioflocculation
  • Chlorella vulgaris
  • Harvesting
  • Microalgal bacterial flocs
  • Wastewater treatment

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