IJSTR >> Volume 9 - Issue 4, April 2020 Edition

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AUTHOR(S)

Le Hung Anh, Vo Thi Kim Khuyen

KEYWORDS

microalgae, Chlorella sp., shrimp farm wastewater, tubular photo-bioreactors (PBR), Can Gio district

ABSTRACT

Microalgae are microorganisms with high performance of wastewater treatment and potential for biofuel production thanks to the ability to convert contaminants in the wastewater into their biomass. Based on these advantages, strains of Chlorella sp. isolated from the shrimp wastewater were pre-cultured in F/2 medium and later applied to treat shrimp aquaculture wastewater using tubular photo-bioreactors (PBR) in both laboratory and outdoor conditions. The wastewater collected from shrimp ponds in Can Gio coastal district was found to be suitable for the growth of Chlorella sp. (salinity 8 ‰, pH 7.33, N-NH4+ 4.32 mg/L and P-PO43- 0.12 mg/L), and a new Chlorella strain isolated from the wastewater could remove nutrients in the wastewater with high speed and efficiency. Nutrient concentrations decreased after the first 4 days of culture, wastewater treatment yields in the laboratory and outdoor culture reached 86.34% and 77.54%, respectively for ammonium removal; 72.5% and 79.1% for phosphate treatment, respectively. Furthermore, the results showed the growth of Chlorella sp. was faster in outdoor culture, compared with laboratory condition. The success of isolating Chlorella sp. strains and using them for shrimp farming wastewater treatment in tubular photo-bioreactors is the basis for further applications on the pilot scale before being implemented in practice.

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