Electrical stimulation improves the efficiency of treating typical reclaimed water in biofilters

To conduct advanced treatment on reclaimed water with a low C/N ratio and a low content of biodegradable organic matter, this paper established an biofilter-microbial electrolysis cell (BF-MEC). Through two-stage influent, the influence of electrical stimulation and electrochemical structure on the...

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Bibliographic Details
Published in:Water science and technology 2024-10, Vol.90 (8), p.2367-2381
Main Authors: Han, Xuwei, Wang, Li, Wang, Jin
Format: Article
Language:English
Subjects:
Activated carbon
Ammonia
Biodegradation
Biofilms
Biofilters
Biological activity
Carbon-nitrogen ratio
Chemical oxygen demand
Denitrification
Electrical stimuli
Electrochemistry
Electrodes
Electrolysis
Electrons
Fuel cells
Heat resistance
Influents
Life span
Microbial activity
Microorganisms
Nitrates
Nitrogen
Organic matter
Oxygen requirement
Reclaimed water
Sludge
Stimulation
Total nitrogen
Voltammetry
Water quality
Water reuse
Water treatment
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Summary:To conduct advanced treatment on reclaimed water with a low C/N ratio and a low content of biodegradable organic matter, this paper established an biofilter-microbial electrolysis cell (BF-MEC). Through two-stage influent, the influence of electrical stimulation and electrochemical structure on the nitrogen and carbon removal of the system was explored, and the following results were obtained. The optimal externally applied voltage for the BF-MEC system is 0.55 V. The optimal structure of the BF-MEC system is an electrode spacing of 100 mm, and the optimal electrode position is when the electrode is located at the bottom of the system. Compared with the BF system, in the first stage, the removal rates of chemical oxygen demand, total ammonia nitrogen (TAN), and total nitrogen (TN) in the optimal structure BF-MEC system are increased by 13.4, 118.1, and 273.65%, respectively. In the second stage, COD, TAN, and TN removal rates are increased by up to 277.98, 115, and 722.98%, respectively. The optimal electrode position is when the electrode is located at the lower part of the system. At this time, the microbial community is more abundant, the microbial activity and lifespan are longer, and the system efficiency is optimal.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2024.336