RESEARCH ON THE EFFECTS OF BIOCHEMICAL FACTORS ON GROWTH AND POLLUTANT REMOVAL EFFICIENCY FROM MUNICIPAL WASTEWATER OF CYANOBACTERIUM S.SALINA M8

Abstract

    Microalgae biotechnology is being considered as a sustainable solution in wastewater treatment due to its ability to effectively absorption and metabolism pollutants and the potential for biomass recovery. The aim of this paper is to use the photoautotrophic cyanobacteria strain S.salina M8, isolated from Vietnamese agricultural water environment, evaluation the effects of biochemical factors including inoculum density, pH and nutrient ratio C:N:P on the growth and domestic wastewater treatment efficiency of S.salina M8 in laboratory scale. Research on the application of methods for sampling and analyzing wastewater in the laboratory and methods for evaluating the growth of S.salina M8. The results showed that S.salina M8  achieved dry cell weight of 1.6 g/L with treatment efficiency reaching over 75% for COD and 85% for substances such as NH₄⁺, total Nitrogen (T-N), PO₄^3- and total phosphorus (T-P) under the preferable conditions of innoculation rate of 20-25% (v/v), pH=7, temperature 27°C, aeration (0.1 vvm) and magnetic stirring (150 rpm), light intensity 4500 Lux and nutrient ratio C:N:P = 100:10:1 after 8 days of culture. The effluent meets the quality standards according to QCVN 14:2008/BTNMT column B. This study demonstrated the potential of S.salina M8 in treating domestic wastewater, and providing valuable biomass, contributing to the development of a green economy and a circular economy.