Molitor Hannah R, Schaeffer Alyssa K, Schnoor Jerald L
Department of Civil and Environmental Engineering, University of Iowa, 103 S. Capitol Street, Iowa City, Iowa 52242, United States.
ACS Omega. 2021 Jun 25;6(27):17362-17371. doi: 10.1021/acsomega.1c01474. eCollection 2021 Jul 13.
Cost-effective nutrient sources and dewatering are major obstacles to sustainable, scaled-up cultivation of microalgae. Employing waste resources as sources of nutrients offsets costs for nutrient supplies while adding value through simultaneous waste treatment. Forward osmosis (FO), using simulated reverse osmosis brine, is a low-energy membrane technology that can be employed to efficiently harvest microalgae from a dilute solution. In this study, , a green microalga, was cultivated with a fertilizer plant wastewater formula and simulated coal-fired power plant flue gas and then separated through either FO, with reverse osmosis reject model water as the draw solution, or sedimentation. Microalgal batches grown with simulated wastewater removed NH within 2 days and reached nitrogen and phosphorus limitation simultaneously on Day 5. Sparging with the flue gas caused to produce significantly greater quantities of extracellular polymeric substances (30.7 ± 1.8 μg mL), which caused flocculation and enhanced settling to an advantageous extent. Five-hour FO trials showed no statistically significant difference ( = 0.65) between water fluxes for cultures grown with simulated flue gas and CO-supplemented air (3.0 ± 0.1 and 3.0 ± 0.3 LMH, respectively). Reverse salt fluxes were low for all conditions and, remarkably, the rate of reverse salt flux was -1.9 ± 0.6 gMH when the FO feed was culture grown with simulated flue gas. In this work, was cultivated and harvested with potential waste resources.
具有成本效益的营养源和脱水是微藻可持续规模化养殖的主要障碍。利用废弃资源作为营养源可抵消营养供应成本，同时通过同步废物处理增加价值。正向渗透（FO）使用模拟反渗透盐水，是一种低能耗膜技术，可用于从稀溶液中高效收获微藻。在本研究中，用化肥厂废水配方和模拟燃煤电厂烟气培养绿藻，然后通过以反渗透浓水模型水为汲取溶液的正向渗透或沉降进行分离。用模拟废水培养的微藻批次在2天内去除了NH，在第5天同时达到氮和磷限制。用烟气鼓泡导致产生显著更多数量的胞外聚合物（30.7±1.8μg/mL），这导致絮凝并在有利程度上增强沉降。5小时的正向渗透试验表明，用模拟烟气和补充CO的空气培养的培养物的水通量之间没有统计学显著差异（P = 0.65）（分别为3.0±0.1和3.0±0.3 LMH）。在所有条件下反向盐通量都很低，并且值得注意的是，当正向渗透进料是用模拟烟气培养的培养物时，反向盐通量速率为-1.9±0.6 gMH。在这项工作中，利用潜在的废弃资源培养和收获了[具体藻类名称未给出]。
