Civil Engineering Department, New Mexico State University, Las Cruces, NM 88003, USA.
Energy Engineering Laboratory, New Mexico State University, Las Cruces, NM 88003, USA.
Bioresour Technol. 2015 Aug;189:273-278. doi: 10.1016/j.biortech.2015.03.120. Epub 2015 Apr 6.
Currently, urban wastewaters (UWW) laden with organic carbon (BOD) and nutrients (ammoniacal nitrogen, N, and phosphates, P) are treated in multi-stage, energy-intensive process trains to meet the mandated discharge standards. This study presents a single-step process based on mixotrophic metabolism for simultaneous removal of carbon and nutrients from UWWs. The proposed system is designed specifically for hot, arid environments utilizing an acidophilic, thermotolerant algal species, Galdieria sulphuraria, and an enclosed photobioreactor to limit evaporation. Removal rates of BOD, N, and P recorded in this study (14.93, 7.23, and 1.38 mg L(-1) d(-1), respectively) are comparable to literature reports. These results confirm that the mixotrophic system can reduce the energy costs associated with oxygen supply in current UWW treatment systems, and has the potential to generate more energy-rich biomass for net energy extraction from UWW.
目前，富含有机碳（BOD）和营养物质（氨氮、N 和磷酸盐、P）的城市废水（UWW）在多阶段、能源密集型工艺中进行处理，以达到规定的排放标准。本研究提出了一种基于混合营养代谢的单步工艺，用于从 UWW 中同时去除碳和营养物质。所提出的系统专为利用嗜酸、耐热藻类物种 Galdieria sulphuraria 和封闭的光生物反应器来限制蒸发的炎热干旱环境而设计。本研究中记录的 BOD、N 和 P 的去除率（分别为 14.93、7.23 和 1.38 mg L(-1) d(-1)）与文献报道相当。这些结果证实，混合营养系统可以降低与当前 UWW 处理系统中氧气供应相关的能源成本，并且有可能从 UWW 中提取更多富含能量的生物质，从而实现净能源提取。
