Safe and ecological treatment of sewage sludge eg. as a fertilizer, requires information about their contamination. This also applies to by-products (ashes) formed during the gasification of the dried sewage sludge. The aim of this study was to present infrared spectroscopy (IR) as a way of assessing the presence of contaminants in the dried sewage sludge and ashes. Two types of sewage sludge were used in the study. The sludge came from a wastewater treatment plant operating in mechanical-biological system and sewage sludge taken from the mechanical-biological-chemical wastewater treatment plant. Ash formed during the fixed bed gasification process of sewage sludge was also analyzed. The results of the analysis were compared to the results obtained using the most popular method of analysis – gas chromatography coupled with mass spectrometry (GC-MS). IR analysis showed significant differences in the degree of contamination of analyzed dried sewage sludge and ashes. There Significant differences in the degree of contamination between compared dried sewage have also been noted. It was also determined that the ashes from gasification were not contaminated with all of the organic substances originally identified in the dried sewage sludge. Similar conclusions were drawn based on the GC-MS analysis. The results lead to a conclusion that the infrared spectroscopy method can be used as a preliminary assessment of the degree of contamination of the samples prior to chromatographic analysis, eg. in screening studies.
[1]
R. Holzer,et al.
Quantitative determination of polycyclic aromatic hydrocarbons, polychlorinated biphenyls and organochlorine pesticides in sewage sludges using supercritical fluid extraction and mass spectrometric detection.
,
1999,
Journal of chromatography. A.
[2]
Norbert Dichtl,et al.
Novel Strategies in Sewage Sludge Treatment
,
2007
.
[3]
S. Werle,et al.
Studies on the adsorption of phenol on dried sewage sludge and solid gasification by-products
,
2016
.
[4]
S. Werle,et al.
Analysis of Organic and Inorganic Contaminants in Dried Sewage Sludge and By-Products of Dried Sewage Sludge Gasification
,
2014
.
[5]
Michael D. Morris,et al.
Microscopic and Spectroscopic Imaging of the Chemical State
,
1993
.
[6]
S. Werle.
Impact of feedstock properties and operating conditions on sewage sludge gasification in a fixed bed gasifier
,
2014,
Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA.
[7]
Angélique Léonard.
Management of Wastewater Sludge's: A Hot Topic at the European Level
,
2011
.