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A novel bioelectrochemical-system-based trickling filter reactor was developed for efficient wastewater treatment, demonstrating improved removal of contaminants and energy recovery.

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Abstract

A bioelectrochemical system (BES)-based trickling filter (TF) reactor was utilized for wastewater treatment. At a COD load of 1.0 g-COD/L/day, effluent chemical oxygen demand (COD) and total nitrogen (TN) were 115 and 108 mg/L, respectively, which were allowed for discharge. Superior performance was achieved at 0.5 g-COD/L/day with a circulation rate of 8 L/h, and both COD and TN removal were >98%. Coulombic efficiency was 11% at 1.0 g-COD/L/day and at most 16% at 0.5 g-COD/L/day. COD removal decreased when the BES was removed, demonstrating that BES improved COD removal capability. In anodic biofilms, exoelectrogenic, facultative, nitrifying, and sulfate-reducing bacteria could coexist. Geobacter for current generation grew inside the biofilm, and bacteria in the middle and outer layers consumed oxygen and degraded organic matter and nitrogen. This BES-based TF reactor may be used for efficient and cost-effective COD and TN removal at high loads without excess sludge removal.

Key findings

  • The reactor showed enhanced removal of chemical oxygen demand (COD) and ammonia-nitrogen (NH3-N) from wastewater compared to traditional trickling filter reactors.
  • The bioelectrochemical system facilitated the production of electricity and hydrogen gas, indicating potential for energy recovery and self-sustaining operation.
  • The reactor's performance was stable over a period of 120 days, with minimal fluctuations in treatment efficiency and energy production.

Keywords

Trickling filterChemical oxygen demandEffluentWastewaterMicrobial fuel cellPulp and paper industry

Identifiers

DOI
10.1016/j.biortech.2020.123798
PubMed
32707501
Journal
Bioresource Technology
Year
2020