Microalgae feedstock production can be integrated with wastewater and industrial sources of carbon dioxide. This study reviews the literature on algae grown on wastewater and includes a preliminary analysis of algal production based on anaerobic digestion sludge centrate from the Howard F. Curren Advanced Wastewater Treatment Plant (HFC AWTP) in Tampa, Florida and secondary effluent from the City of Lakeland wastewater treatment facilities in Lakeland, Florida. It was demonstrated that a mixed culture of wild algae species could successfully be grown on wastewater nutrients and potentially scaled to commercial production. Algae have demonstrated the ability to naturally colonize low-nutrient effluent water in a wetland treatment system utilized by the City of Lakeland. The results from these experiments show that the algae grown in high strength wastewater from the HFC AWTP are light-limited when cultivated indoor since more than 50% of the outdoor illumination is attenuated in the greenhouse.An analysis was performed to determine the mass of algae that can be supported by the wastewater nutrients (mainly nitrogen and phosphorous) available from the two Florida cities. The study was guided by the growth and productivity data obtained for algal growth in the photobioreactors in operation at the University of South Florida. In the analysis, nutrients and light are assumed to be limited, while CO2 is abundantly available. There is some limitation on land, especially since the HFC AWTP is located at the Port of Tampa. The temperature range in Tampa is assumed to be suitable for algal growth year round. Assuming that the numerous technical challenges to achieving commercial-scale algal production can be met, the results presented suggest that an excess of 71 metric tons per hectare per year of algal biomass can be produced. Two energy production options were considered; liquid biofuels from feedstock with high lipid content, and biogas generation from anaerobic digestion of algae biomass. The total potential oil volume was determined to be approximately 337,500 gallons per year, which may result in the annual production of 270,000 gallons of biodiesel when 80% conversion efficiency is assumed. This production level would be able to sustain approximately 450 cars per year on average. Potential biogas production was estimated to be above 415,000 kg/yr, the equivalent of powering close to 500 homes for a year.
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机译：微藻原料的生产可以与废水和二氧化碳的工业来源结合在一起。这项研究回顾了有关废水中藻类生长的文献，并包括基于佛罗里达州坦帕市Howard F. Curren高级废水处理厂（HFC AWTP）的厌氧消化污泥浓缩液和莱克兰市的二次废水对藻类生产进行的初步分析。佛罗里达州莱克兰的废水处理设施。结果表明，野生藻类的混合培养物可以成功地利用废水中的养分生长，并有可能扩大规模用于商业化生产。藻类已经证明有能力在莱克兰市利用的湿地处理系统中自然定殖低营养废水。这些实验的结果表明，在HFC AWTP的高强度废水中生长的藻类在室内栽培时受到光的限制，因为温室中超过50％的室外照明被衰减了。进行了分析以确定藻类的质量佛罗里达州两个城市提供的废水养分（主要是氮和磷）可以支持这一目标。该研究以在南佛罗里达大学运营的光生物反应器中藻类生长获得的生长和生产力数据为指导。在分析中，养分和光被认为是有限的，而二氧化碳却很丰富。土地有一些限制，特别是因为HFC AWTP位于坦帕港。坦帕的温度范围被认为适合全年藻类生长。假设可以解决实现商业规模藻类生产的众多技术挑战，那么提出的结果表明，每年每公顷藻类生物质能生产超过71公吨的藻类。考虑了两种能源生产方案；来自高脂质含量的原料的液态生物燃料，以及藻类生物质的厌氧消化产生的沼气。确定的总潜在油量为每年约337,500加仑，如果假定转换效率为80％，则可能导致年产量为270,000加仑的生物柴油。这样的生产水平将平均每年能够维持约450辆汽车。潜在的沼气产量估计超过415,000公斤/年，相当于一年为近500户家庭供电。
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