Effects of pH and aeration rates on removal of organic matter and nutrients using mixotrophic microalgae

Abstract

Specific growth rate and removal rate of nitrogen and phosphorus of Chlorella sorokiniana, Chlorella vulgaris, Senedesmus dimorphus those are able to metabolite mixotrophically and have high nitrogen and phosphorus removal capacity were examined. Based on the results, one microalgae was selected and conducted experiments to identify the operating factors such as pH and aeration rate. The specific growth rate and phosphorus removal rate of C. sorokiniana significantly presented as 0.29 day -1 and 1.65 mg-P/L/day, while the nitrogen removal rate was high as 12.7 mg-N/L with C. vulgaris. C. sorokiniana was chosen for appropriate microalgae to applying for wastewater treatment system and was cultured in pH ranged 3 to 11. High specific growth rate and removal rate of nitrogen and phosphorus were shown at pH 7 as 0.71 day -1 , 7.61 mg-N/L/day, and 1.24 mg-P/L/day, respectively. The specific growth rate examined with aeration rate between 0 and 2 vvm (vol/vol-min) highly presented as 1.2 day -1 with 1.5 ~ 2 vvm, while the nitrogen removal rate was elevated with 0.5 vvm as 9.43 mg-N/L/day.

Produção de microalgas acopladas ao tratamento de esgoto: panorama e desafios

“…Esgoto como meio de cultura Estima-se que existem cerca de 72.500 espécies de algas catalogadas presentes em ecossistemas de água doce, marinho e terrestre (GUIRY, 2012). Entretanto, apenas algumas espécies foram testadas quanto a sua tolerância à poluição orgânica (ARAVANTINOU et al, 2013), sendo os gêneros Chlorella e Scenedesmus os mais usuais em estudos de cultivo com esgoto (MATTOS et al, 2012;KIM et al, 2013;CHOI et al, 2015;POSADAS et al, 2015;HONG et al, 2016;SHCHEGOLKOVA et al, 2018).…”