Electroactive bacteria–algae biofilm coupled with siphon aeration boosts high-salinity wastewater purification: A pilot study focusing on performance and microbial community

Zusammenfassung

Constructed wetland–microbial fuel cells (CW–MFC) and aeration technology are typically used for the treatment of mariculture wastewater with a low carbon/nitrogen ratio and high-salinity. However, salt inhibition limits their efficiency. Here, based on CW–MFC, an electroactive bacteria–algae biofilm and siphon aeration technology were employed in a pilot study to validate their technical and economic feasibility. The system yielded average removal efficiencies of 80.99 % ± 1.3 %, 92.59 % ± 3.13 %, 94.03 % ± 5.11 %, 97.38 % ± 3.62 %, and 95.95 % ± 2.59 %, respectively, for chemical oxygen demand, total phosphorus, total nitrogen, sulfamethoxazole, and Cu2+, with an average voltage of 354 ± 23 mV. Nitrification and denitrification bacteria Vicingus (12.52 %), Marinobacter (7.93 %), Muricauda (10.86 %), and Xanthomarina (13.62 %); extracellular respiratory bacteria Geobacteraceae (9.47 %) and Pseudomonas (2.54 %); and microalgae bacteria Pseudooceanicola (12.45 %) and Hoeflea (7.45 %) were significantly enriched. The energy consumption per ton of sewage treatment was 0.0045 kWh·m⁻³, representing 47.87 % lower costs than those related to traditional aeration. These results proved the feasibility of CW–MFC coupled with electroactive bacteria–algae biofilm and siphon aeration tidal flow technology for mariculture wastewater treatment.

Schlagwörter

Kennungen

DOI

10.1016/j.jwpe.2023.103841

Zeitschrift

Journal of Water Process Engineering

Jahr

2023