Basic micro-pollutants in sludge from municipal wastewater treatment plants in the Northwest Spain: Occurrence and risk assessment of sludge disposal

Fernández-Fernández, V.; Ramil, M.; Rodrı́guez, I.

doi:10.1016/j.chemosphere.2023.139094

Cited by 11 publications

(1 citation statement)

References 31 publications

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“…Waste-activated sludge (WAS), a by-product of sewage treatment, poses significant environmental risks due to its substantial production and high concentration of pollutants [1]. Anaerobic digestion (AD) emerges as a crucial technological solution to mitigate the environmental impact of WAS, simultaneously allowing for the recovery of valuable resources.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Methanogenesis of Waste-Activated Sludge (WAS) in a Continuous Stirring Tank Reactor with Stealth Electrodes

He,

Zhang,

Zhang

et al. 2024

Fermentation

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The integration of a microbial electrolysis cell (MEC) is an effective strategy for enhancing the efficiency and stability of an anaerobic digestion (AD) system for energy recovery from waste-activated sludge (WAS). Typically, electrodes are arranged as separate components, potentially disrupting mixing and complicating the reactor configuration, posing challenges for the scaling up of AD-MEC coupling systems. In this study, electrodes were introduced into a continuous stirring tank reactor (CSTR) in a “stealth” manner by integrating them with the inner wall and stirring paddle. This electrode arrangement approach was validated through a sequential batch digestion experiment, resulting in a remarkable 1.5-fold increase in cumulative methane production and a shortened lag period compared to the traditional CSTR with a nonconductive inner wall and stirring paddle. Both the conductive materials (CMs) employed in the electrodes and the electrochemical processes equally contributed to the observed enhancement effect of the electrodes by regulating the evolution of the microbial community within the electrode biofilms, with a specific emphasis on the enrichment of methanogens (primarily Methanobacterium). This research offers a potential avenue to solve the contradiction between the electrode introduction and the mixing operation in AD-MEC coupling systems and to contribute to its future commercial application.

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Section: Introductionmentioning

confidence: 99%