Study on the ability to treat bilge wastewater from fishing boat by cultivating and harvesting the microalgae Chlorella vulgaris
Abstract
The current situation of pollution in fishing ports of many coastal localities in Vietnam is caused by the discharge of bilge water from fishing vessels directly into the sea. This wastewater has the characteristics of containing large amounts of organic matter and nutrients, with high value of COD, total nitrogen (TN) and total phosphorus (TP), high salinity, and contaminated with mineral oil. This paper studies on the cultivation of microalgae Chlorella vulgaris in this wastewater medium for the purpose of wastewater treatment and biomass recovery. The results show that this microalgae strain can adapt in this wastewater medium, with salinity <7‰. After 15 days of microalgae culture and harvesting by ECF method, the wastewater quality was improved prominently with pollution indicators reduced by over 90%. From the 10th day, the density of microalgal biomass reached the maximum threshold, corresponding to 0.93g/L of dry biomass, and the concentration of Chlorophyll a was 31.65 μg/ml.
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