Classification analysis and biodegradability of dissolved organic matter in acrylic wastewater
WANG Ya'-e1, JI Bin1, LI Jie1, ZHAO Wei1, XIE Hui-na1, ZHOU Yue-xi2
1. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
2. Research Center of Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
The dissolved organic matters of acrylic wastewater were fractionated into six fractions separated by ultra-filtration membrane. The amounts and structural compositions of organic compounds were characterized by dissolved organic carbon (DOC), UV254 and specific ultraviolet light absorbance (SUVA); the material structure was qualitatively analyzed by Fourier transform infrared spectrometer (FTIR) and ultraviolet spectrum (UV). The results showed that the fraction of molecular weight less than 3kDa had the largest proportion occupied (56.75±1.38)% in the wastewater, and the molecular weight of 3k~10kDa was occupied (25.76±1.40)%. Interestingly, the fraction of molecular weight more than 10kDa had a high degree of aromatic structure, although it only accounted for 17.49%. The analytical results of UV and FTIR demonstrated that the spectral absorptive characteristics of organic compounds from different fractions were not significantly different.The fractions contained an acyl group, a carboxyl group, a carbonyl group compound and an aromatic compound and an unsaturated double bond type organic substance, respectively. The results of biodegradability indicated that the fraction of molecular weight more than 10kDa was the major reason for the low biodegradability of acrylic wastewater, which is probably the root cause of the difficulty discharge under certain standard. The results of this study provided an important guidance for the development and optimization of acrylic wastewater treatment process.
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