Journal
BIOMASS & BIOENERGY
Volume 143, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2020.105853
Keywords
Phycoremediation; Rice mill wastewater; Bio-diesel production; Chlorella pyrenoidosa; Algal technology; Single-step transesterification
Funding
- Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India [YSS/2015/000527]
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Sustainable resources management, incorporating energy markets and resources such as electricity, fossil fuels, renewable and sustainable energy capital is essential for society to understand production and conversion of various forms of energy, their current as well as future supply. Waste-to-energy (WTE) or energy-from-waste (EFW) is a well-identified transitional technology which could prevent complete depletion of renewable resources. In our present study, the selected microalgae (Chlorella pyrenoidosa) was cultured in paddy-soaked wastewater (PWW) using outdoor raceway ponds of 50 L capacity where biotransformation of nutrients (NH3-N removal: 75.89 +/- 0.69%; PO4-P removal: 73.71 +/- 0.75%; yield co-efficient YN: 6.12 mg biomass/mg of N; YP: 7.77 mg biomass/mg P) has occurred with better growth and biochemical composition (dry biomass weight: 1.56 +/- 0.11 g/L; chlorophyll: 15.57 +/- 0.14 mg/L; specific growth rate (SGR): 0.42/d; lipids: 27.47 +/- 1.41% biomass; carbohydrates: 23.77 +/- 1.00% and protein: 46.12 +/- 3.55%). Further, the obtained algal lipid was identified for a wide range of fatty acid methyl esters (FAME) and consequently brought forward to in-situ single-step transesterification by optimizing reaction conditions. Central composite design (CCD) of response surface methodology (RSM) has given optimized conditions of sample amount: 2 g (wet); methanol sulphuric acid volume: 3 mL; and hexane volume: 4 mL, under the reaction temperature of 90 degrees C for maximum biodiesel conversion (46.54% of algal lipids). The outcome of our current research may add value to the application and development of WTE technology for sustainable energy conservation.
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