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Toward better understanding and feasibility of controlling greenhouse gas emissions from treatment of industrial wastewater with activated sludge

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Abstract

Wastewater treatment plants (WWTPs) have been recognized as important sources for anthropogenic greenhouse gas (GHG) emission. The objective of the study was to thoroughly investigate a typical industrial WWTP in southern Taiwan in winter and summer which possesses the emission factors close to those reported values, with the analyses of emission factors, mass fluxes, fugacity, lab-scale in situ experiments, and impact assessment. The activated sludge was the important source in winter and summer, and nitrous oxide (N2O) was the main contributor (e.g., 57 to 91 % of total GHG emission in a unit of kg carbon dioxide-equivalent/kg chemical oxygen demand). Albeit important for the GHGs in the atmosphere, the fractional contribution of the GHG emission to the carbon or nitrogen removal in wastewater treatment was negligible (e.g., less than 1.5 %). In comparison with the sludge concentration or retention time, adjusting the aeration rate was more effective to diminish the GHG emission in the activated sludge without significantly affecting the treated water quality. When the aeration rate in the activated sludge simulation was reduced by 75 %, the mass flux of N2O could be diminished by up to 53 % (from 9.6 to 4.5 mg/m2-day). The total emission in the WWTP (including carbon dioxide, methane, and N2O) would decrease by 46 % (from 0.67 to 0.36 kg CO2-equiv/kg COD). However, the more important benefit of changing the aeration rate was lowering the energy consumption in operation of the WWTP, as the fractional contribution of pumping to the total emission from the WWTP ranged from 46 to 93 % within the range of the aeration rate tested. Under the circumstance in which reducing the burden of climate change is a global campaign, the findings provide insight regarding the GHG emission from treatment of industrial wastewater and the associated impact on the treatment performance and possible mitigation strategies by operational modifications.

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Acknowledgment

This research was conducted under the auspices of the Taiwan National Science Council (NSC) under the contact number (NSC 102-EPA-F-009-002). Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the NSC.

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Authors and Affiliations

  1. Institute of Environmental Engineering, National Sun Yat-sen University, Kaohsiung, 804, Taiwan

    Wei-Hsiang Chen, Jun-Hong Yang & Chung-Shin Yuan

  2. Department of Environmental Resources Management, Chia Nan University of Pharmacy and Science, Tainan, 717, Taiwan

    Ying-Hsien Yang

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  1. Wei-Hsiang Chen
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  2. Jun-Hong Yang
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Correspondence to Wei-Hsiang Chen.

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Responsible Editor: Bingcai Pan

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Chen, WH., Yang, JH., Yuan, CS. et al. Toward better understanding and feasibility of controlling greenhouse gas emissions from treatment of industrial wastewater with activated sludge. Environ Sci Pollut Res 23, 20449–20461 (2016). https://doi.org/10.1007/s11356-016-7183-2

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  • DOI: https://doi.org/10.1007/s11356-016-7183-2

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