Porter School of Environment and Earth Sciences, Tel Aviv University, Israel.
Gili Ocean Technology Ltd., Neve Yamin, Israel.
Bioresour Technol. 2020 Jan;295:122229. doi: 10.1016/j.biortech.2019.122229. Epub 2019 Oct 3.
Offshore macroalgae biomass production is a promising, yet challenging, pathway to provide feedstock for biorefineries. In this work, a device and a process for dewatering offshore grown biomass of the green macroalgae Ulva sp. using high-voltage pulsed electric fields (PEF) was developed. Ulva sp. was cultivated attached to fish cages 15 km offshore. Increasing the applied voltage from 250 V to 500 V and invested PEF energy from 9.3 ± 0.4 J g FW to 54.6 ± 0.2Jg FW increased the extracted water from 0.033 ± 0.006 g Water g FW to 0.150 ± 0.031 g Water g FW. The energy consumption to achieve similar moisture content with air convection drying was lower by 78.73 ± 10.41 (JgFW) for 250 V and 339.31 ± 48.01 (JgFW) for 500 V, pulse duration 50 µs, pulse number 50, pulse repetition frequency 3 Hz. PEF leads to biomass compression of 8.45 ± 1.72% for 250 V protocol and 25.66 ± 2.53% for 500 V protocol. In addition, PEF leads to the reduction of water diffusivity of 18-19% in the treated biomass, reducing air drying kinetics.
离岸大型藻类生物质生产是提供生物炼制原料的有前途但具有挑战性的途径。在这项工作中，开发了一种使用高压脉冲电场 (PEF) 对在离岸生长的绿藻 Ulva sp. 的生物质进行脱水的设备和工艺。Ulva sp. 附着在距海岸 15 公里的鱼笼中进行培养。将施加的电压从 250 V 增加到 500 V，并将施加的 PEF 能量从 9.3 ± 0.4 J g FW 增加到 54.6 ± 0.2 J g FW，可将提取的水量从 0.033 ± 0.006 g 水 g FW 增加到 0.150 ± 0.031 g 水 g FW。对于 250 V，空气对流干燥达到相似水分含量的能耗降低了 78.73 ± 10.41 (J gFW)，对于 500 V，能耗降低了 339.31 ± 48.01 (J gFW)，脉冲持续时间为 50 µs，脉冲数为 50，脉冲重复频率为 3 Hz。PEF 导致 250 V 协议下生物质压缩 8.45 ± 1.72%，500 V 协议下生物质压缩 25.66 ± 2.53%。此外，PEF 导致处理后生物质的水分扩散率降低 18-19%，从而降低了空气干燥动力学。
