Politecnico di Milano, Department of Civil and Environmental Engineering - Environmental Section, Piazza Leonardo da Vinci 32, 20133, Milano, Italy.
Politecnico di Milano, Department of Civil and Environmental Engineering - Environmental Section, Piazza Leonardo da Vinci 32, 20133, Milano, Italy.
J Environ Manage. 2021 Feb 1;279:111605. doi: 10.1016/j.jenvman.2020.111605. Epub 2020 Nov 7.
This study investigates the environmental improvements associated to the integration of a microalgae unit as a side-stream process within an existing municipal wastewater treatment facility in northern Italy. Microalgae are fed on the centrate from sludge dewatering, rich in nutrients, and on the CO in the flue-gas of the combined heat and power unit. The produced biomass is recirculated upflow the water line where it settles and undergoes anaerobic digestion generating extra biogas. A life cycle assessment was performed collecting primary data from an algal pilot-scale plant installed at the facility. Fifteen environmental indicators were evaluated. Compared to the baseline wastewater treatment, the new algal configuration allows an improvement for 7 out of 15 indicators mainly thanks to the electricity savings in the facility. Some recommendations are provided to improve the performance of the algal system in the scaling up.
本研究调查了将微藻单元集成到意大利北部现有城市污水处理厂的侧流工艺中所带来的环境改善。微藻以浓缩物为食，浓缩物富含营养物质，并且以联合热电联产单元烟道气中的 CO2 为食。产生的生物质在水流上流循环，在那里沉淀并进行厌氧消化，产生额外的沼气。通过从安装在该设施中的藻类中试工厂收集原始数据，进行了生命周期评估。评估了 15 个环境指标。与基准污水处理相比，新的藻类配置允许 15 个指标中的 7 个得到改善，这主要得益于设施中的节电。提供了一些建议，以提高藻类系统在扩大规模时的性能。
