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Factors affecting microalgae harvesting efficiencies using electrocoagulation-flotation for lipid extraction

机译：影响微藻采集效率的因素使用电凝浮选进行脂质萃取

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摘要

Microalgae harvesting is a relatively costly process in microalgae biodiesel production. In this study, electrocoagulation-flotation (ECF) was employed to harvest microalgae (Chlorella vulgaris). Higher current density achieved higher collection efficiency, but also resulted in higher energy consumption and increased levels of dissolved aluminium. At the same ratio of current density to initial cell density, collection efficiency decreased from 99.0% of 0.24 g L-1 to 30.5% of 1.17 g L-1 when the electrolysis time was 20 min. For stirring and aeration, the highest collection efficiency was 98.4%, obtained by stirring at 50 rpm for 20 min. This efficiency was nearly equal to the highest collection efficiency for aeration: 98.3% for 50 mL min(-1) aeration at 30 min. Acidic and neutral culture conditions were beneficial due to the positively charged aluminium species in the culture; higher collection efficiencies (more than 98%) occurred with pH levels of 5-7 after 20 min. The lowest energy consumption of 0.61 kW h kg(-1) was achieved at pH 5. In this research, ECF exhibited higher collection efficiency (99.4%) as compared to the 93.5% collection efficiency of chemical flocculation (Al-2(SO4)(3)).
机译：微藻收获是微藻生物柴油生产中的一种相对昂贵的方法。在该研究中，用电凝浮选（ECF）用于收获微藻（Noortgaris）。电流密度较高达到较高的收集效率，但也导致能耗更高，溶解铝水平增加。以相同的电流密度与初始细胞密度的比率相同，当电解时间20分钟时，收集效率从0.24g 1 -1 -1至30.5％的0.24g 1 -1至30.5％的比例降低。为了搅拌和通气，最高收集效率为98.4％，在50rpm下搅拌20分钟获得。这种效率几乎等于曝气的最高收集效率：30分钟的50mL min（-1）曝气量为98.3％。酸性和中性培养条件由于培养中带正电荷的铝物质; 20分钟后，pH水平为5-7的较高收集效率（超过98％）。在本研究中，在本研究中实现了0.61 kW H kg（-1）的最低能耗（-1），与化学絮凝93.5％的收集效率相比，ECF呈现更高的收集效率（99.4％）（AL-2（SO4） （3））。

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  • 来源
    《RSC Advances》 |2015年第8期|共6页
  • 作者

    Zhang Dawei; Yu Yanling; Li Chao; Chai Chunyan; Liu Lili; Liu Jia; Feng Yujie;

  • 作者单位

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Peoples R China;

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Peoples R China;

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Peoples R China;

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Peoples R China;

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Peoples R China;

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Peoples R China;

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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