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Integrating microalgae tertiary treatment into activated sludge systems for energy and nutrients recovery from wastewater. | LitMetric

Integrating microalgae tertiary treatment into activated sludge systems for energy and nutrients recovery from wastewater.

Bioresour Technol

GEMMA - Group of Environmental Engineering and Microbiology, Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya·BarcelonaTech, c/ Jordi Girona 1-3, Building D1, E-08034 Barcelona, Spain. Electronic address:

Published: January 2018

AI Article Synopsis

Article Abstract

In this study, microalgae digestate and secondary effluent were used to grow microalgae in a tertiary wastewater treatment, and then, the biomass was co-digested for biogas generation. A 30L closed-photobioreactor was used for microalgae cultivation. The biomass, mainly composed by Scenedesmus sp., reached and maintained a concentration of 1.1gTSS/L during 30days. A complete removal of N-NH and P-PO and high nitrates and organic matter removals were achieved (58% N-NO and 70% COD) with 8d of HRT. The potential biogas production of the cultivated microalgae was determined in batch tests. To improve their biodegradability, a novel method combining their co-digestion with activated sludge after a simultaneous autohydrolysis co-pretreatment was evaluated. After the co-pretreatment, the methane yield increased by 130%. Thus, integrating microalgae tertiary treatment into activated sludge systems is a promising and feasible solution to recover energy and nutrients from waste, improving wastewater treatment plants sustainability.

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Source
http://dx.doi.org/10.1016/j.biortech.2017.09.123DOI Listing

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