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Real-time organic compound monitoring in advanced oxidation process (AOP) of anaerobic digestion effluent: introduction of UV-VIS spectrum representative index by discrete Fourier transform

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Abstract

Anaerobic digestion effluent from sewage treatment plants (STP) poses a challenge to the operator because of its high organic matter and inorganic nitrogen concentrations, which require an effective process for biological treatment. This study aimed to introduce a UV-VIS spectrum representative index by discrete Fourier transform (DFT) and apply UV-Vis spectrophotometric techniques for real-time organic compound monitoring in the AOP process using anaerobic digestion tank effluent wastewater. The effect of advanced oxidation on the organic compounds of effluent using ozonation was examined. In this research, after treating secondary treated water with the UV-AOP process and anaerobic digestion effluent with ozone microbubble systems, changes in organic substances were expressed by the UV-Vis spectrum and compared with conventional water quality parameters. The anaerobic digestion process effluent was treated through ozone oxidation, had a high curve, and fell gently from 230 to 667 nm. Discrete Fourier transform (DFT) was applied to obtain representative values from the obtained spectrum. From among the coefficients obtained by analyzing the UV-Vis spectrum through DFT, an expected value was selected, and the correlation between CODMn and a3 was the highest (correlation function = 0.694, RSQ = 0.482). Therefore, a linear regression analysis was performed to determine which water quality factor it was related to.

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The authors confirm that the data supporting the findings of this study are available within the article [and/or] its supplementary materials.

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Acknowledgements

The authors are very grateful for the funds [Project, NRF-2021K1A4A8A01079319] provided by the “National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT”.

Funding

This research is financially supported by a grant from National Research Foundation of Korea (NRF) (NRF-2021K1A4A8A01079319) provided by the “National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT”.

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Authors and Affiliations

  1. Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology, Goyang, 10223, Korea

    Jesmin Akter, Weonjae Kim, Ilho Kim & Jaiyeop Lee

  2. Department of Civil and Environmental Engineering, University of Science and Technology, Daejeon, 34113, Korea

    Jesmin Akter, Weonjae Kim, Ilho Kim & Jaiyeop Lee

Authors
  1. Jesmin Akter
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  2. Weonjae Kim
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  3. Ilho Kim
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  4. Jaiyeop Lee
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Contributions

Jesmin Akter analyzed and collected the data and wrote the first version of the manuscript. Wonjae Kim conceived the study and commented on the results and contributed to fund acquisition. Ilho Kim also conceived the study, contributed to designing the experimental plan, and commented on the results. Jaiyeop Lee contributed to revising the manuscript and managed the data, the calculations and interpreted the results, and improved the writing. All authors reviewed the results and approved the final version of the manuscript.

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Correspondence to Jaiyeop Lee.

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Highlights

•Changes in organic substances were reached through the efficient UV-AOP process and ozonation with a microbubble nozzle.

•DAS decreased in ozone treatment and increased in the UV-AOP process.

•Spectral parameters in the 186.232~667.856 nm range can be used to evaluate the changes in DOM.

•Discrete Fourier transform (DFT) was used to analyze the UV-Vis spectrum.

•DFT coefficients were extracted from each UV-Vis spectrum.

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Akter, J., Kim, W., Kim, I. et al. Real-time organic compound monitoring in advanced oxidation process (AOP) of anaerobic digestion effluent: introduction of UV-VIS spectrum representative index by discrete Fourier transform. Environ Monit Assess 195, 1387 (2023). https://doi.org/10.1007/s10661-023-11984-2

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