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首页> 外文会议>Annual Water Environment Federation technical exhibition and conference >Growth of Algae for Biofuel Production in Highly Saline Oilfield Fracking Wastewater
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Growth of Algae for Biofuel Production in Highly Saline Oilfield Fracking Wastewater

机译：高盐度油田压裂废水中用于生物燃料生产的藻类生长

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Fracking systems for natural gas and oil extraction require and produce large volumes of wastewater ("produced water"), which can be highly saline, such as in the Permian Basin in New Mexico and Texas. Treatment of such waters for reuse and disposal is a major challenge. Simultaneously, the biofuel production from algal lipids (or total algal biomass) has potential as a renewable energy source, but water demands can be high, particularly in arid regions. A laboratory study was conducted to evaluate suitability of highly saline produced water for algal growth and lipid production, including (1) a polyculture obtained from a saline produced water pond and (2) an algal isolate (Dunaliella tertiolecta) known to grow well in saline waters, with salinity and nutrient concentrations as experimental variables. 23s rRNA gene sequencing using the Illumina MiSeq system determined the polyculture was composed primarily of Parachlorella kessleri and Cyanobacterium aponinum. The polyculture growth was greatest (approximately 50 mg ash free dry weight, VSS/(L*d) at salinities from 15 to 60 g TDS/L and was greatly inhibited at higher salinities. D. tertiolecta exhibited a consistent growth of 17 mg VSS/(L*d) from 30 to 120 g TDS/L and lower growth rates up to 210 g TDS/L. The salinity tolerance of each culture would allow it to be cultivated in hypersaline PW, which as of yet, has found few other uses. Both the polyculture and D. tertiolecta displayed the highest growth in hypersaline media with initial nutrient concentrations of 13 mg NH4-N/L and 1.7 mg PO4-P/L. The polyculture had the highest lipid productivity in 60 g TDS/L PW with phosphorus limitation of conditions tested. Nutrient limitation was not an effective way to increase lipid content for D. tertiolecta. These results demonstrated the potential for algal growth in saline and hypersaline produced waters and identified conditions to improve growth rates. Future work may focus on treatment of the wastewaters for potential reuse.
机译：用于天然气和石油开采的压裂系统需要并产生大量废水（“产出水”），这些废水可能是高盐分的，例如在新墨西哥州和德克萨斯州的二叠纪盆地。处理此类水以进行再利用和处置是一项重大挑战。同时，由藻类脂质（或藻类总生物量）生产生物燃料具有作为可再生能源的潜力，但对水的需求可能很高，特别是在干旱地区。进行了一项实验室研究，以评估高盐度水对藻类生长和脂质产生的适应性，包括（1）从盐度水塘中获得的混养和（2）已知在盐水中生长良好的藻类分离物（杜氏杜氏藻）水，盐度和营养物浓度作为实验变量。使用Illumina MiSeq系统对23s rRNA基因进行测序，确定了混合培养物主要由凯氏小球藻和皂荚蓝藻组成。在15至60 g TDS / L的盐度下，混合培养物的生长最大（约50 mg无灰干重，VSS /（L * d）），在较高盐度下受到极大抑制，D。tertiolecta的生长持续稳定在17 mg VSS /（L * d）从30到120 g TDS / L，并且较低的生长速率高达210 g TDS / L。每种培养物的盐度耐受性使其可以在高盐度PW中进行培养，到目前为止，发现的盐分很少混合培养和D. tertiolecta在高盐培养基中均表现出最高的生长，其初始养分浓度为13 mg NH4-N / L和1.7 mg PO4-P / L，在60 g TDS / L PW的磷限制条件进行了测试，营养限制不是增加D. tertiolecta脂质含量的有效方法，这些结果表明了在盐水和高盐度产水中藻类生长的潜力，并确定了改善生长速率的条件，未来的工作可能专注于治疗废水以供潜在的再利用。

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