On-Line Measurement of the Chemical Oxygen Demand in Wastewater in a Pulp and Paper Mill Using Near Infrared Spectroscopy

Abstract

Although near infrared (NIR) spectroscopy has been evaluated for numerous applications, the number of actual on-line or even on-site industrial applications seems to be very limited. In the present paper, the attempts to produce on-line predictions of the chemical oxygen demand (COD) in wastewater from a pulp and paper mill using NIR spectroscopy are described. The task was perceived as very challenging, but with a root mean square error of prediction of 149 mg/l, roughly corresponding to 1/10 of the studied concentration interval, this attempt was deemed as successful. This result was obtained by using partial least squares model regression, interpolated reference values for calibration purposes, and by evenly distributing the calibration data in the concentration space. This work may also represent the first industrial application of on-line COD measurements in wastewater using NIR spectroscopy.

Use of near-infrared spectroscopy on predicting wastewater constituents to facilitate the operation of a membrane bioreactor

“…They measured TP, TN, BOD, TOC and turbidity with correlation coefficients for cross-validation of 0.79, 0.78, 0.83, 0.79, and 0.75, respectively. Furthermore, Dahlbacka et al (2014) tried to predict COD in wastewater from pulp and paper mill. Since the values of R 2 for validation and R 2 for validation in PLS model were 0.76 and 0.19 respectively, their model was not suitable for on-line predictions.…”

“…Suehara et al (2007) also evaluated the use of NIR spectroscopy to determine the concentrations of urea, solids, and oil of a wastewater from a biodiesel fuel production plant with satisfactory accuracy. In addition, other researchers have investigated the use of NIR spectroscopy to predict the concentration of relevant municipal and industrial wastewater treatment parameters such as total suspended solids (TSS), BOD, COD, TOC, TN, and TP (Dahlbacka et al, 2014;Inagaki et al, 2010;Pan et al, 2012;Pan and Chen, 2012;Pascoa et al, 2008;Yang et al, 2009). Although some studies have used NIR spectroscopy to determine wastewater treatment-related constituents, there is no information in the literature on the application of the NIR analytical method to determine wastewater parameters for MBR systems.…”

Analysis method and monitoring technology for chemical oxygen demand in seawater

“…[82] , 限制了微量化合物的检出, 常 作为UV光谱的参考和补充 [73] . 目前NIR单一光谱法 测定COD的研究多集中于有机物含量高的造纸废水 [83] 、 制糖废水 [84] 、 乳制品废水 [85] 、 生活废水 [86]…”

Recovery and reuse of spent chrome tanning effluent from tannery using electro-oxidation technique

“…The sulphuric acid reagent (2.5%, w/v) was prepared by dissolving Ag 2 SO 4 in H 2 SO 4 , and the sampling and digestion of the sample were carried out in accordance with the methodology described under the analysis of water and wastewater [24]. Total organic carbon (TOC) analysis was performed using element arvario TOC select instrument for the samples collected for every 30 min during the electrooxidation process [31].…”