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Pollutant removal from municipal sewage by a microaerobic up-flow oxidation ditch coupled with micro-electrolysis. | LitMetric

Pollutant removal from municipal sewage by a microaerobic up-flow oxidation ditch coupled with micro-electrolysis.

R Soc Open Sci

Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province, Key Laboratory of Natural Polymer Functional Material of Haikou City, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, People's Republic of China.

Published: December 2021

AI Article Synopsis

  • - A microaerobic up-flow oxidation ditch (UOD) with waterfall aeration was developed to efficiently treat municipal wastewater, investigating various factors like up-flow rate and iron dosing to optimize pollutant removal.
  • - The treatment process achieved high elimination efficiencies for key pollutants: 84.33% for chemical oxygen demand (COD), 99.91% for ammonia nitrogen (NH-N), 93.63% for total nitrogen (TN), and 89.27% for total phosphorus (TP).
  • - Phosphorus was removed through iron-carbon micro-electrolysis, leading to insoluble ferric phosphate formation, while the microbial community utilized several mechanisms, including nitrification and denitrification, for effective carbon and

Article Abstract

The development of efficient and low-cost wastewater treatment processes remains an important challenge. A microaerobic up-flow oxidation ditch (UOD) with micro-electrolysis by waterfall aeration was designed for treating real municipal wastewater. The effects of influential factors such as up-flow rate, waterfall height, reflux ratio, number of stages and iron dosing on pollutant removal were fully investigated, and the optimum conditions were obtained. The elimination efficiencies of chemical oxygen demand (COD), ammonia nitrogen (NH -N), total nitrogen (TN) and total phosphorus (TP) reached up to 84.33 ± 2.48%, 99.91 ± 0.09%, 93.63 ± 0.60% and 89.27 ± 1.40%, respectively, while the effluent concentrations of COD, NH -N, TN and TP were 20.67 ± 2.85, 0.02 ± 0.02, 1.39 ± 0.09 and 0.27 ± 0.02 mg l, respectively. Phosphorous removal was achieved by iron-carbon micro-electrolysis to form an insoluble ferric phosphate precipitate. The microbial community structure indicated that carbon and nitrogen were removed via multiple mechanisms, possibly including nitrification, partial nitrification, denitrification and anammox in the UOD.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8633808PMC
http://dx.doi.org/10.1098/rsos.201887DOI Listing

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