Determination of chemical oxygen demand of papermaking wastewater via dual-wavelength ultraviolet spectroscopy

作者：Wang, Yu-Feng^*; Chen, Ke-Fu; Mo, Li-Huan^*; Zhou, Zhi-Ming

来源：Journal of South China University of Technology(Natural Science Edition), 2012, 40(2): 156-160.

DOI：10.3969/j.issn.1000-565X.2012.02.027

• Automatic monitors
• Dual wavelength
• Dual-wavelength method
• Good correlations
• Papermaking wastewater
• Rapid determination
• Reference wavelengths
• Suspended solids

This paper deals with the feasibility of direct COD (chemical oxygen demand) determination for papermaking wastewater via ultraviolet spectroscopy, with two kinds of papermaking wastewater being used in the experiments. The results show that (1) the two kinds of papermaking wastewater both possess the maximum UV absorption wavelength of 272 nm although they are of different sources; (2) there is a good correlation between the UV absorbance at 272 nm and the COD; and (3) by using 546nm as a reference wavelength, the interference of suspended solids in the wastewater with the UV absorbance is eliminated and the correlation curve becomes more accurate. Moreover, as compared with the standard testing method of COD, the proposed dual-wavelength method is of high precision and accuracy that well meet the requirements of Standard HJ/T 377-2007 Water Quality On-Line Automatic Monitor of Chemical Oxygen Demand (COD Cr), which means that it is feasible in the rapid determination of COD for papermaking wastewater.

• 出版日期2012-2
• 单位华南理工大学