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- Title
Characterization of persistent colors and decolorization of effluent from biologically treated cellulosic ethanol production wastewater.
- Authors
Shan, Lili; Liu, Junfeng; Yu, Yanling; Ambuchi, John; Feng, Yujie
- Abstract
The high chroma of cellulosic ethanol production wastewater poses a serious environmental concern; however, color-causing compounds are still not fully clear. The characteristics of the color compounds and decolorization of biologically treated effluent by electro-catalytic oxidation were investigated in this study. Excitation-emission matrix (EEM), fourier transform infrared spectrometer (FTIR), UV-Vis spectra, and ultrafiltration (UF) fractionation were used to analyze color compounds. High chroma of wastewater largely comes from humic materials, which exhibited great fluorescence proportion (67.1 %) in the biologically treated effluent. Additionally, the color compounds were mainly distributed in the molecular weight fractions with 3-10 and 10-30 kDa, which contributed 53.5 and 34.6 % of the wastewater color, respectively. Further decolorization of biologically treated effluent by electro-catalytic oxidation was investigated, and 98.3 % of color removal accompanied with 97.3 % reduction of humic acid-like matter was achieved after 180 min. The results presented herein will facilitate the development of a well decolorization for cellulosic ethanol production wastewater and better understanding of the biological fermentation.
- Subjects
SEWAGE; CELLULOSIC ethanol; CATALYTIC oxidation; FOURIER transform infrared spectrophotometers; FLUORESCENCE; MOLECULAR weights
- Publication
Environmental Science & Pollution Research, 2016, Vol 23, Issue 10, p10215
- ISSN
0944-1344
- Publication type
Academic Journal
- DOI
10.1007/s11356-016-6220-5