A simple UV spectrophotometric procedure for the survey of industrial sewage system

Khorassani, H. El; Trebuchon, P.; Bitar, H.; Thomas, Olivier

doi:10.1016/s0273-1223(99)00256-5

Cited by 16 publications

(2 citation statements)

References 6 publications

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“…For example, sulfonates absorb in the region of 220–290 nm [ 52 , 53 ]. Furthermore, carboxylic acids and aldehydes have also been found to absorb in the range of 190–280 nm [ 54 ]. The third characteristic absorption band was in the visible region, at 425 nm, and corresponded to the chromophore group of the dye.…”

Section: Resultsmentioning

confidence: 99%

“…These results imply that the Fenton process allows the oxidation of organic contaminants present in the wastewater, including the dye. The fraction of the absorption band persistent in the UV region may be associated with the presence of residual carboxylic acids (also absorb in the 190–280 nm range [ 54 ]) and/or incomplete oxidation products. This coincides with the remaining values of TOC.…”

Section: Resultsmentioning

confidence: 99%

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Analysis of the Capacity of the Fenton Process for the Treatment of Polluted Wastewater from the Leather Dyeing Industry

Gómez

García

Dobrosz-Gómez

2023

The Scientific World Journal

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In this work, the capacity of the Fenton oxidation process for the degradation of color and organic matter contained in the wastewater generated in the leather dyeing stage (WWDS) of an industrial tannery was evaluated. The wastewater characteristics included, among others, high toxicity (lethal concentration for Artemia salina, 24 h test, 50% of population = 93.71 ppm), high dye concentration (36 mg/L, yellow color), high chromium concentration (3.34 mg/L), and low biodegradability index (BOD5/COD ratio = 0.083). From an experimental design, the response surface methodology, and the multiobjective optimization analysis, the following optimal operating conditions were established: initial pH = 3.15, [Fe2+] = 0.981 mM, and [H2O2] = 5.38 mM. After 10 min of oxidation (determined from kinetic studies), it reached approximately 97% decolorization, COD reduction of approximately 82%, and TOC mineralization of approximately 92%. A synergistic effect of Fenton’s reagents for TOC removal (STOC = 0.8) and decolorization (SCN = 0.28) of the WWDS under study was confirmed experimentally. An increase in the biodegradability index, to a value of approximately 0.3, was confirmed. The cost of the treatment was estimated at 0.0112 USD/m3. Thus, the Fenton oxidation process allowed compliance with current Colombian environmental regulations and considerably improved the biodegradability and toxicity characteristics of the studied industrial effluent. It can be considered as an efficient alternative, easy to carry out on an industrial batch scale, and economically viable for the treatment of wastewater from the leather dyeing stage of an industrial tannery.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Analysis of the Capacity of the Fenton Process for the Treatment of Polluted Wastewater from the Leather Dyeing Industry

Gómez

García

Dobrosz-Gómez

2023

The Scientific World Journal

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A new spectrophotometric method for measuring COD of seawater

Liu

Hong-wei

Xin

et al. 2006

J. Ocean Univ. China

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Quantitative monitoring of an activated sludge reactor using on-line UV-visible and near-infrared spectroscopy

et al. 2009

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The performance of an activated sludge reactor can be significantly enhanced through use of continuous and real-time process-state monitoring, which avoids the need to sample for off-line analysis and to use chemicals. Despite the complexity associated with wastewater treatment systems, spectroscopic methods coupled with chemometric tools have been shown to be powerful tools for bioprocess monitoring and control. Once implemented and optimized, these methods are fast, nondestructive, user friendly, and most importantly, they can be implemented in situ, permitting rapid inference of the process state at any moment. In this work, UV-visible and NIR spectroscopy were used to monitor an activated sludge reactor using in situ immersion probes connected to the respective analyzers by optical fibers. During the monitoring period, disturbances to the biological system were induced to test the ability of each spectroscopic method to detect the changes in the system. Calibration models based on partial least squares (PLS) regression were developed for three key process parameters, namely chemical oxygen demand (COD), nitrate concentration (N-NO(3)(-)), and total suspended solids (TSS). For NIR, the best results were achieved for TSS, with a relative error of 14.1% and a correlation coefficient of 0.91. The UV-visible technique gave similar results for the three parameters: an error of approximately 25% and correlation coefficients of approximately 0.82 for COD and TSS and 0.87 for N-NO(3)(-) . The results obtained demonstrate that both techniques are suitable for consideration as alternative methods for monitoring and controlling wastewater treatment processes, presenting clear advantages when compared with the reference methods for wastewater treatment process qualification.

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A simple UV spectrophotometric procedure for the survey of industrial sewage system

Cited by 16 publications

References 6 publications

Analysis of the Capacity of the Fenton Process for the Treatment of Polluted Wastewater from the Leather Dyeing Industry

Analysis of the Capacity of the Fenton Process for the Treatment of Polluted Wastewater from the Leather Dyeing Industry

A new spectrophotometric method for measuring COD of seawater

Quantitative monitoring of an activated sludge reactor using on-line UV-visible and near-infrared spectroscopy

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