Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 18, Issue 2, 2016; Page No.(339-344)

ENHANCING THE EFFICIENCY OF CARBON DIOXIDE REMOVAL BY SYNERGIZING CONSTRUCTED MICROALGAE CONSORTIUM IN CLOSED SYSTEM PHOTOBIOREACTOR

ASTRI RINANTI, DEA INDRIANI ASTUTI, KANIA DEWI AND EDWAN KARDENA

Abstract

Association of microalgae culture seems a promising technology for sustainable algal biomass and biological removal of carbon dioxide. The increasing concentration of carbon dioxide (CO2) in the atmosphere is considered to be one of the main causes of global warming. Biological CO2 sequetration has been extensively investigated as part of efforts to solve the problem. Microalgae are fast growing systems that can consume high quantities of CO2 to produce different types of metabolite products. Specific goals of this study was to evaluate and analyze about CO2 removal ability between single culture and mixed culture that were capable of tolerating up to 7% CO2 (gas phase) concentrations. In the first step of the work, the growth of single culture microalgae was studied in a vertical tubular photobioreactor with different levels of a CO2concentration supplied. The second stage, constructed consortium consisted of three photosynthetic microalgae species isolated from BojongSoang Waste Water Treatment Plant, which are Chlorella sp, Scenedesmuso bliquus and Ankistrodesmus sp, growth in vertical tubular photobioreactor, with operational condition were 25oC, 2500 lux light intensity, 8 L min-1 CO2 flow rate, was evaluated and thenrates of carbon removal were determined. The study showed that single culture as well as mixed culture could live tolerately and grew well in high CO2 concentration. Due to indications of dry biomass, growth rate and CO2 removal efficiency, the photo bioreactor with supply 5% CO2 concentration was the best condition. However, mixed culture has higher removal efficiency of CO2, that was up to 19.13%, than single culture of Chlorella sp. Scenedesmus sp, and Ankistrodemus, that were 17.74; 8.36; 16.93 respectively. The mixed culture with CO2 concentration supply of 5% also has the highest dry biomass (g.L-1) and growth rate (μ; day-1) which are 1.14 and 0.21, respectively.

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