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Operation parameters optimization of a hybrid dead-end/cross-flow forward osmosis system for microalgae dewatering by response surface methodology
Process Safety and Environmental Protection ( IF 7.8 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.psep.2020.06.010
Cong Ma , Huihui Yu , Yujie Gao , Wenjie Xu , Tiefu Xu , Liang Wang , Bin Zhao , Zhaohui Zhang , Jun Xu

Abstract The high energy consumption of the microalgae dewatering process results in microalgae being less economically feasible as a new bioenergy material. As an energy-saving method, forward osmosis (FO) filtration can be applied in microalgae dewatering to reduce membrane fouling and energy consumption. In this study, a novel hybrid dead-end/cross-flow FO system was proposed to obtain highly efficient microalgae dewatering. The effects of agitation speed, draw solution concentration, and pH on microalgae and membrane flux reduction volume concentration factors were investigated using Box-Behnken design (BBD) of response surface methodology (three factors and three levels). The results demonstrated that the higher the draw solution concentration and agitation speed, the higher the volume concentration factors. When the draw solution concentration and agitation speed reached their maximums (5 M and 500 r, respectively), the maximum volume concentration factor was obtained (3.73). pH exhibited the greatest influence on flux reduction. The flux reduction decreased more with an increase in pH (pH > 7). When the pH was neutral or acidic, the influence of pH on flux was insignificant. This study provided a more efficient method for dewatering and reduced energy consumption by applying a BBD to optimize the operation parameters of a novel hybrid dead-end/cross-flow FO system for microalgae dewatering.

中文翻译:

响应面法优化混合死端/错流正渗透微藻脱水系统运行参数

摘要 微藻脱水过程的高能耗导致微藻作为一种新的生物能源材料的经济可行性较低。作为一种节能方法,正向渗透(FO)过滤可应用于微藻脱水,以减少膜污染和能耗。在这项研究中,提出了一种新型的混合死端/错流 FO 系统,以获得高效的微藻脱水。使用响应面方法(三个因素和三个水平)的 Box-Behnken 设计 (BBD) 研究了搅拌速度、汲取溶液浓度和 pH 值对微藻和膜通量减少体积浓度因素的影响。结果表明,汲取溶液浓度和搅拌速度越高,体积浓度因子越高。当汲取溶液浓度和搅拌速度达到最大值(分别为 5 M 和 500 r)时,获得最大体积浓度因子 (3.73)。pH 值对通量降低的影响最大。随着 pH 值的增加(pH > 7),通量减少量下降得更多。当 pH 为中性或酸性时,pH 对通量的影响不显着。本研究通过应用 BBD 来优化用于微藻脱水的新型混合死端/错流 FO 系统的操作参数,提供了一种更有效的脱水方法并降低了能耗。当 pH 为中性或酸性时,pH 对通量的影响不显着。本研究通过应用 BBD 来优化用于微藻脱水的新型混合死端/错流 FO 系统的操作参数,提供了一种更有效的脱水方法并降低了能耗。当 pH 为中性或酸性时,pH 对通量的影响不显着。本研究通过应用 BBD 来优化用于微藻脱水的新型混合死端/错流 FO 系统的操作参数,提供了一种更有效的脱水方法并降低了能耗。
更新日期:2020-11-01
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