The effect of primary treatment of wastewater in high rate algal pond systems: biomass and bioenergy recovery
Rights accessOpen Access
European Commission's projectSuPER-W - Sustainable Product, Energy and Resource Recovery from Wastewater (EC-H2020-676070)
The aim of this study was to assess the effect of primary treatment on the performance of two pilot-scale high rate algal ponds (HRAPs) treating urban wastewater, considering their treatment efficiency, biomass productivity, characteristics and biogas production potential. Results indicated that the primary treatment did not significantly affect the wastewater treatment efficiency (NH4+-N removal of 93 and 91% and COD removal of 62 and 65% in HRAP with and without primary treatment, respectively). The HRAP without primary treatment had higher biodiversity and productivity (20 vs. 15 g VSS/m2d). Biomass from both systems presented good settling capacity. Results of biochemical methane potential test showed that co-digesting microalgae and primary sludge led to higher methane yields (238–258 mL CH4/g VS) compared with microalgae mono-digestion (189–225 mL CH4/g VS). Overall, HRAPs with and without primary treatment seem to be appropriate alternatives for combining wastewater treatment and bioenergy recovery.
CitationArashiro, L. [et al.]. The effect of primary treatment of wastewater in high rate algal pond systems: biomass and bioenergy recovery. "Bioresource technology", Maig 2019, vol. 280, p. 27-36.