کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
242668 501896 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Biodiesel production from algae cultivated in winter with artificial wastewater through pH regulation by acetic acid
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
پیش نمایش صفحه اول مقاله
Biodiesel production from algae cultivated in winter with artificial wastewater through pH regulation by acetic acid
چکیده انگلیسی


• Wintering cultivation of algae in artificial wastewater was investigated.
• pH regulation could improve the nutrient removal and biomass productivity.
• High lipid content and productivity were obtained by regulating pH.
• Biodiesel yield in the pH-regulated group was 19.44% of dry weight.
• It is efficient to grow C. zofingiensis in winter by pH regulation using acetic acid.

Algae have been considered as a promising biodiesel feedstock. One of the major factors affecting large-scale algae technology application is poor wintering cultivation performance. In this study, an integrated approach is investigated combining freshwater microalgae Chlorella zofingiensis wintering cultivation in pilot-scale photobioreactors with artificial wastewater treatment. Mixotrophic culture with the addition of acetic acid (pH-regulation group) and autotrophic culture (control group) were designed, and the characteristics of algal growth, lipid and biodiesel production, and nitrogen and phosphate removal were examined. The results showed that, by using acetic acid three times per day to regulate pH at between 6.8 and 7.2, the total nitrogen (TN) and total phosphate (TP) removal could be increased from 45.2% to 73.5% and from 92.2% to 100%, respectively. Higher biomass productivity of 66.94 mg L−1 day−1 with specific growth rate of 0.260 day−1 was achieved in the pH-regulation group. The lipid content was much higher when using acetic acid to regulate pH, and the relative lipid productivity reached 37.48 mg L−1 day−1. The biodiesel yield in the pH-regulated group was 19.44% of dry weight, with 16–18 carbons as the most abundant composition for fatty acid methyl esters. The findings of the study prove that pH adjustment using acetic acid is efficient in cultivating C. zofingiensis in wastewater in winter for biodiesel production and nutrient reduction.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Energy - Volume 128, 1 September 2014, Pages 103–110
نویسندگان
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