Abstract
The Fenton process is used as a tertiary treatment to remove organic pollutants from the effluent of bio-treated pharmaceutical wastewater (EBPW). The optimal and most appropriate Fenton conditions were determined by an orthogonal array test and single-factor experiments. The removal of chemical oxygen demand (COD) was influenced by the following factors in a descending order: H2O2/Fe(II) molar ratio > H2O2 dosage > reaction time. Under the most appropriate Fenton conditions (H2O2/Fe(II) molar ratio of 1:1, H2O2 dosage of 120 mg L−1 and reaction time of 10 min), the COD and dissolved organic carbon (DOC) were removed with efficiencies of 62 and 53%, respectively, which met the national discharge standard (GB 21903-2008) for the Lake Tai Basin, China. However, the Fenton treatment was inadequate for removal of N compounds, and the removal of organic nitrogen led to an increment in N-NH3 from 3.28 to 19.71 mg L−1. Proteins and polysaccharides were completely removed, and humic acids (HAs) were partly removed with an efficiency of 55%. Three-dimensional excitation/emission matrix spectra (3DEEMs) indicated complete removal of fulvic acid-like substances and 90% reduction in the florescence intensity of humic acid-like substances. Organic pollutants with molecular weights (MW) > 10 kDa were completely removed, MW 5–10 kDa were degraded into smaller MW ones, and some low molecular weight acids (MW 0.1–1 kDa) were mineralized during the Fenton process. Some species, including pharmaceutical intermediates and solvents were detected by gas chromatography-mass spectrometry (GC-MS). The operational costs of the Fenton’s treatment were estimated to be 0.58 yuan RMB/m3 EBPW based on reagent usage and iron sludge treatment and disposal.
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Cheng, Y., Chen, Y., Lu, J. et al. Fenton treatment of bio-treated fermentation-based pharmaceutical wastewater: removal and conversion of organic pollutants as well as estimation of operational costs. Environ Sci Pollut Res 25, 12083–12095 (2018). https://doi.org/10.1007/s11356-018-1400-0
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DOI: https://doi.org/10.1007/s11356-018-1400-0