New procedure for the control of the treatment of industrial effluents to remove volatile organosulfur compounds

Abstract

We present a new procedure for the determination of volatile organosulfur compounds in samples of industrial effluents using dispersive liquid-liquid microextraction and gas chromatography with flame photometric detection. Initially, the extraction parameters were optimized. These included: type and volume of extraction solvent, volume of disperser solvent, salting out effect, pH, time and speed of centrifugation as well as extraction time. The procedure was validated for 30 compounds. The developed procedure has low detection limits of 0.0071-0.49 μg/L and a good precision (relative standard deviation values of 1.2-5.0 and 0.6-4.1% at concentrations of 1 and 10 μg/L, respectively). The procedure was used to determine the content of volatile organosulfur compounds in samples of effluents from the production of bitumens before and after chemical treatment, in which six compounds were identified, including 2-mercaptoethanol, thiophenol, thioanisole, dipropyl disulfide, 1-decanethiol, and phenyl isothiocyanate at concentrations ranging from 0.47 to 8.89 μg/L. Problems in the determination of organosulfur compounds related to considerable changes in composition of the effluents, increase in concentration of individual compounds and appearance of secondary pollutants during effluent treatment processes are also discussed.

Method for the simultaneous determination of monoaromatic and polycyclic aromatic hydrocarbons in industrial effluents using dispersive liquid–liquid microextraction with gas chromatography–mass spectrometry

“…The two batches of wastewater were obtained from two blends containing different ratios of different crude oil contents. The same problem was observed in previous studies [32], where the changes in the feed stream for oxidation of vacuum residuum caused a completely different composition of the effluents. In raw effluent with TiO 2 , the problem with adsorption of the analytes on the catalyst surface was also observed.…”

“…The remaining parameters, that is the volume of IPA, extraction time, and centrifugation time, were not significant factors in the studied range. The same effect was observed in previous studies . Therefore, 700 μL of IPA, 20 s extraction time, and 5 min centrifugation were used in further experiments.…”

New procedure for the examination of the degradation of volatile organonitrogen compounds during the treatment of industrial effluents

“…Among the disperser solvents tested, isopropanol provided the smallest enrichment factor while methanol and acetone had similar values of R . Since acetone was used in previous studies , it was selected as the disperser solvent.…”

“…Effluents from the production of bitumens are an example of strongly toxic effluents containing volatile organic compounds, including organosulfur, oxygenated, and organonitrogen compounds. Due to their specific properties, these effluents pose numerous problems during their treatment [12][13][14][15][16].…”

Absorptive Desulfurization of Model Biogas Stream Using Choline Chloride-Based Deep Eutectic Solvents

“…Concentration (mg/Nm 3 biogas) Volatile organosulfur compounds are commonly found in many products and waste streams, causing technological and environmental problems [8,9]. VSCs are chemical compounds which are characterized by high toxicity, malodorousness, and high reactivity [10].…”