When photosynthetic autotrophy is used for large-scale production of microalgae, the cell concentration in the microalgae culture fluid does not generally exceed 2 g/L. Therefore, how to efficiently and economically harvest microalgae cells from a huge amount of culture fluid has always been an impact on the microalgae energy. One of the key technologies for resource utilization. Conventional techniques such as flocculation, sedimentation, centrifugation, and filtration cannot be applied to large-scale harvesting of microalgae due to problems such as low efficiency, high energy consumption, and continuous operation difficulties. In contrast, air flotation has the advantages of continuous operation and easy amplification. However, traditional dissolved air flotation relies on the production of dissolved gas through high-pressure air or a dissolved air pump. The energy consumption is still very high.
Recently, the microalgae biotechnology team of the Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, has funded the development of a technology for electrolysis and floatation of microalgae based on graphite electrodes under the financial support of the national “863†project. They used a specially designed comb-like double graphite double electrode mounted on the bottom of the air float to replace the traditional dissolved air water with high-efficiency electrolyzed water generated by direct current (not higher than 5 volts) to replace the traditional dissolved air (Figure A). The results show that the microalgae produced by electrolyzed water are smaller in diameter (1-3 μm in diameter) and more uniform than the traditional microbubbles released by dissolved gas. The recovery yield of Chlorella vulgaris can reach 95% or more. For every 1 kg of harvested microalgae (dry weight), the energy consumption for electrolysis and air floatation only needs 0.03 kWh, which is only 1/5 of the energy consumption of conventional dissolved air flotation and 1/30 of the centrifugal energy consumption, which greatly reduces the recovery of microalgae. cost. At present, the technology has established a 2000 L/h continuous electrolysis gas flotation and recovery device and completed a pilot test. The research results were published in Algal Research (2016, 18: 7-14), and the related method and device structure applied for an invention patent (application number 9.).
It needs to be pointed out that the use of graphite double electrodes in this technology also avoids the contamination of algae harvesting and recovery fluids produced by metal ions produced by traditional metal electrodes, and is beneficial to improve the quality of microalgae products and the circulation of the recovery solution. Used, so it is particularly suitable for economical health microalgae such as chlorella, micro spine algae harvesting.
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