کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7063152 1459800 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Harvesting microalgal biomass using magnesium coagulation-dissolved air flotation
ترجمه فارسی عنوان
جمع آوری زیست توده میکروالگل با استفاده از انحلال هوا انحلال منیزیم
کلمات کلیدی
برداشت میکروالگل، شناور بازیافت متوسط، بازیافت کواگولانت، تصفیه بیومس،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
چکیده انگلیسی
Coagulation with magnesium was found to be more effective for harvesting microalgae Chlorella zofingiensis with dissolved air flotation (DAF) than the use of Fe3+, Al3+ or chitosan, and the required coagulant dosage was in the order Mg2+ < chitosan < Al3+ < Fe3+. The Mg2+ dosage required depended on the growth phases and culture medium characteristics. An early exponential culture required the highest Mg2+ dosage (226 mg g−1), while a late stationary culture required the lowest dosage (36 mg g−1). HPO42− and CO32− in the culture medium competed with the microalgal cells for Mg2+ and increased the Mg2+ dosage necessary. No Mg2+ addition was required to harvest the freshwater microalgae Scenedesmus dimorphus grown in a pond with tap water with a high Mg2+ concentration or the marine microalgae Nannochloropsis sp. The critical coagulation pH ranged between 10.8 and 11.8, with a lower pH requirement at a higher Mg2+ concentration. Magnesium hydroxide precipitated with the harvested biomass; however, over 99.5% of the precipitated Mg2+ was recovered by washing the biomass with 0.1 M HCl. Microalgal harvesting with Mg2+ did not introduce extrinsic coagulant; thus, neither the biomass nor the medium was contaminated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biomass and Bioenergy - Volume 93, October 2016, Pages 43-49
نویسندگان
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