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Bio-desalination of brackish and seawater using halophytic algae
Desalination ( IF 8.3 ) Pub Date : 2019-09-01 , DOI: 10.1016/j.desal.2019.05.002
Endalkachew Sahle-Demessie 1 , Ashraf Aly Hassan 2 , Amro El Badawy 3
Affiliation  

Global demand for water is rising. A sustainable and energy efficient approach is needed to desalinate brackish sources for agricultural and municipal water use. Genetic variation among two algae species, Scenedesmus species (S. sp.) and Chlorella vulgaris (C. vulgaris), in their tolerance and uptake of salt (NaCl) was examined for potential bio-desalination of brackish water. Salt-tolerant hyper-accumulators were evaluated in a batch photobioreactors over salinity concentration ranging from 2 g/L to 20 g/L and different nutrient composition for their growth rate and salt-uptake. During algae growth phase, the doubling time varied between 0.63 and 1.81 days for S. sp. and 3.1 to 5.9 for C. vulgaris. The initial salt-uptake followed pseudo first order kinetics where the rate constant ranged between -3.58 and -7.68 day-1 reaching up to 30% in a single cycle. The halophyte algae S. sp. and C. vulgaris that were selected for pilot-scale studies here represent a promising new method for desalination of brackish waters. Halophytic technologies combined with the potential use of algae for biofuel, which offsets energy demand, can provide a sustainable solution for clean, affordable water and energy.

中文翻译:


利用盐生藻类对苦咸水和海水进行生物淡化



全球对水的需求正在上升。需要一种可持续且节能的方法来淡化农业和市政用水的咸水来源。研究了栅藻 (S. sp.) 和小球藻 (C. vulgaris) 这两种藻类在耐盐性和吸收盐 (NaCl) 方面的遗传变异,以探讨苦咸水生物淡化的潜力。在批量光生物反应器中对耐盐超积累植物的生长速率和盐吸收进行了评估,盐度浓度范围为 2 g/L 至 20 g/L,不同的营养成分也不同。在藻类生长阶段,S. sp. 的倍增时间在 0.63 至 1.81 天之间变化。对于普通念珠菌为 3.1 至 5.9。初始盐吸收遵循伪一级动力学,其中速率常数范围在 -3.58 和 -7.68 day-1 之间,在单个循环中达到 30%。盐生藻类 S. sp。被选用于中试规模研究的 C. vulgaris 和 C. vulgaris 代表了一种有前途的咸水淡化新方法。盐生植物技术与藻类生物燃料的潜在用途相结合,可以抵消能源需求,可以为清洁、负担得起的水和能源提供可持续的解决方案。
更新日期:2019-09-01
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