skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Vitrification as an alternative to landfilling of tannery sewage sludge

Abstract

Highlights: • The possibility of vitrification of tannery sewage sludge was investigated. • Glass cullet was substituted with different wastes of mineral character. • Component ratio in the processed mixtures was optimized. • Environmental safety of the acquired vitrificates was verified. • An alternative management approach of usually landfilled waste was presented. - Abstract: Due to high content of heavy metals such as chromium, tannery sewage sludge is a material which is difficult to be biologically treated as it is in the case of organic waste. Consequently, a common practice in managing tannery sewage sludge is landfilling. This poses a potential threat to both soil and water environments and it additionally generates costs of construction of landfills that meet specific environment protection requirements. Vitrification of this kind of sewage sludge with the addition of mineral wastes can represent an alternative to landfilling. The aim of this study was to investigate the possibility of obtaining an environmentally safe product by means of vitrification of tannery sewage sludge from a flotation wastewater treatment process and chemical precipitation in order to address the upcoming issue of dealing with sewage sludge from the tannery industry which will be prohibited to be landfilled in Polandmore » after 2016. The focus was set on determining mixtures of tannery sewage sludge with additives which would result in the lowest possible heavy metal leaching levels and highest hardness rating of the products obtained from their vitrification. The plasma vitrification process was carried out for mixtures with various amounts of additives depending on the type of sewage sludge used. Only the materials of waste character were used as additives. One finding of the study was an optimum content of mineral additives in vitrified mixture of 30% v/v waste molding sands with 20% v/v carbonate flotation waste from the zinc and lead industry for the formulations with flotation sewage sludge, and 45% v/v and 5% v/v, respectively, for precipitation sewage sludge. These combinations allowed for obtaining products with negligible heavy metal leaching levels and hardness similar to commercial glass, which suggests they could be potentially used as construction aggregate substitutes. Incineration of sewage sludge before the vitrification process lead to increased hardness of the vitrificates and reduced leaching of some heavy metals.« less

Authors:
;
Publication Date:
OSTI Identifier:
22443562
Resource Type:
Journal Article
Resource Relation:
Journal Name: Waste Management; Journal Volume: 34; Journal Issue: 12; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; CARBONATES; CHROMIUM; COMBUSTION; COST; ENVIRONMENTAL PROTECTION; FLOTATION; HEAVY METALS; INDUSTRY; LEACHING; LEAD; MINERAL WASTES; ORGANIC WASTES; POLAND; PRECIPITATION; SANITARY LANDFILLS; SEWAGE SLUDGE; VITRIFICATION; WASTE WATER; WATER TREATMENT; ZINC

Citation Formats

Celary, Piotr, E-mail: pcelary@is.pcz.czest.pl, and Sobik-Szołtysek, Jolanta, E-mail: jszoltysek@is.pcz.czest.pl. Vitrification as an alternative to landfilling of tannery sewage sludge. United States: N. p., 2014. Web. doi:10.1016/J.WASMAN.2014.08.022.
Celary, Piotr, E-mail: pcelary@is.pcz.czest.pl, & Sobik-Szołtysek, Jolanta, E-mail: jszoltysek@is.pcz.czest.pl. Vitrification as an alternative to landfilling of tannery sewage sludge. United States. doi:10.1016/J.WASMAN.2014.08.022.
Celary, Piotr, E-mail: pcelary@is.pcz.czest.pl, and Sobik-Szołtysek, Jolanta, E-mail: jszoltysek@is.pcz.czest.pl. 2014. "Vitrification as an alternative to landfilling of tannery sewage sludge". United States. doi:10.1016/J.WASMAN.2014.08.022.
@article{osti_22443562,
title = {Vitrification as an alternative to landfilling of tannery sewage sludge},
author = {Celary, Piotr, E-mail: pcelary@is.pcz.czest.pl and Sobik-Szołtysek, Jolanta, E-mail: jszoltysek@is.pcz.czest.pl},
abstractNote = {Highlights: • The possibility of vitrification of tannery sewage sludge was investigated. • Glass cullet was substituted with different wastes of mineral character. • Component ratio in the processed mixtures was optimized. • Environmental safety of the acquired vitrificates was verified. • An alternative management approach of usually landfilled waste was presented. - Abstract: Due to high content of heavy metals such as chromium, tannery sewage sludge is a material which is difficult to be biologically treated as it is in the case of organic waste. Consequently, a common practice in managing tannery sewage sludge is landfilling. This poses a potential threat to both soil and water environments and it additionally generates costs of construction of landfills that meet specific environment protection requirements. Vitrification of this kind of sewage sludge with the addition of mineral wastes can represent an alternative to landfilling. The aim of this study was to investigate the possibility of obtaining an environmentally safe product by means of vitrification of tannery sewage sludge from a flotation wastewater treatment process and chemical precipitation in order to address the upcoming issue of dealing with sewage sludge from the tannery industry which will be prohibited to be landfilled in Poland after 2016. The focus was set on determining mixtures of tannery sewage sludge with additives which would result in the lowest possible heavy metal leaching levels and highest hardness rating of the products obtained from their vitrification. The plasma vitrification process was carried out for mixtures with various amounts of additives depending on the type of sewage sludge used. Only the materials of waste character were used as additives. One finding of the study was an optimum content of mineral additives in vitrified mixture of 30% v/v waste molding sands with 20% v/v carbonate flotation waste from the zinc and lead industry for the formulations with flotation sewage sludge, and 45% v/v and 5% v/v, respectively, for precipitation sewage sludge. These combinations allowed for obtaining products with negligible heavy metal leaching levels and hardness similar to commercial glass, which suggests they could be potentially used as construction aggregate substitutes. Incineration of sewage sludge before the vitrification process lead to increased hardness of the vitrificates and reduced leaching of some heavy metals.},
doi = {10.1016/J.WASMAN.2014.08.022},
journal = {Waste Management},
number = 12,
volume = 34,
place = {United States},
year = 2014,
month =
}
  • A Cr(VI)-resistant yeast, designated strain DBVPG 6502, was isolated from a sewage treatment plant receiving wastes from tannery industries in Italy. The strain was tentatively identified as a species of Candida based on morphological and physiological analyses. This strain was highly resistant to Cr(VI) when compared with eight other yeast species, growing at Cr(VI) concentrations of up to 500 micrograms/ml (10 mM). This resistance was constitutive. The Cr(VI)-resistant yeast did not reduce Cr(VI) to Cr(III) species under aerobic conditions. The yeast showed very little accumulation of Cr(VI). Consequently, the mechanism of resistance of the yeast to Cr(VI) appears to involvemore » reduced accumulation of Cr, as has been shown in Cr(VI)-resistant bacteria.« less
  • The geotechnical properties of a mixture of municipal solid waste incinerator bottom ash and municipal wastewater treatment plant sludge was investigated for a proposed ash/sludge secure landfill. The components as well as mixtures ranging from 10:1 to 5:1 (ash:sludge, by volume) were evaluated, where appropriate, for a number of geotechnical index and mechanical properties including particle size, water content, specific gravity, density-moisture relationships, shear strength, and compressibility. The results from a compactibility study and stability analysis of the proposed landfill were used to help approve a landfill codisposal concept; a full-scale facility was constructed and is currently operating successfully.
  • A new chromatographic method for the simultaneous determination of Cu(II), Zn(II), Cr(III), Al(III), and Fe(III) or Fe(II) has been developed. The method is based on precolumn formation of stable metal-8-hydroxyquinoline chelates, their separation on a C-18 reversed-phase column by HPLC, and their UV-vis detection at 400 nm. The experimental conditions giving the highest chelate yields resulted: pH 4.2; T = 90C; reaction time 30 min; reaction mixture composition methanol (66.7%)/acetonitrile (13.3%)/water (20%) (v/v/v) plus 10 mM 8-hydroxyquinoline. The mobile-phase composition giving the best resolution of Cr(III)- and Al(III)-8-hydroxyquinoline chromatographic peaks has been optimized by the simplex algorithm: acetonitrile (13.5%)/methanol (29%)/0.1more » acetate buffer pH 6.8 (13.5%) (v/v/v) plus 100 mM 8-hydroxyquinoline. The method has been applied to synthetic solutions as well as, after sample pretreatment on XAD-7 resin, to real sulfuric acid extracts of tannery sludges. As for this latter matrix, additional information on Cr and Fe oxidation states has been obtained, combining the proposed method with atomic absorption spectroscopy and ion chromatography.« less
  • The feasibility of co-composting Ramsey County (Minnesota) solid waste with sewage sludge from the metropolitan water treatment plant in St. Paul is analyzed. The potential of co-composting the wastes to produce a marketable product is discussed in the context of six major criteria. These are accessibility of market demand, capital at risk, total system economics, technical reliability, system flexibility, and barriers to implementation. This initial summary discusses accessibility of market demand and capital at risk in detail. The study concluded that all of Ramsey County's solid waste could be reduced in mass and volume through co-composting with sewage sludge. Becausemore » waste generation may be decreased over the long term through recycling and other methods, a conservative planning scenario was developed for combining 273,750 tons/year of Ramsey County solid waste with 273,750 tons/year of sewage sludge to produce 219,000 tons/year of co-compost. (MCW)« less
  • Cogasification of sewage sludge mixed with coal showed that the amount of sewage sludge supplied to the gasifier, depending on its availability, could vary without affecting the gasifier performance; however, it had an influence on the syngas composition. The use of sewage sludge during coal gasification gave rise to an increasing gas yield and energy conversion, mainly because the gas produced had a greater hydrocarbon content. H{sub 2}S, HCl, and especially NH{sub 3} were also found to increase, due to higher contents of nitrogen in the sewage sludge compared with coal. The rise of both the temperature and the airmore » flow rate resulted in the production of more gas and a lowering of hydrocarbon, char, and tar contents. A decrease in NH{sub 3} content was also observed, as the increase of these parameters promoted the destruction of this compound. The rise in the equivalent ratio also led to lower contents of H{sub 2}S and HCl, probably due to the partial oxidation of these compounds; however, the total amount of these elements released to the gas phase was not considerably affected. On the other hand, H{sub 2}S formation was favored by the rise in temperature up to 850{sup o}C, while the HCl concentration was not significantly affected. Heavy metals supplied with the fuel were mostly retained in solid residues, with Pb and Hg being the most volatile at 850{sup o}C. However, the leachability of these metals was found to be below the analytical detection levels, and only small quantities of SO{sub 4}{sup 2-} and Cl{sup -} were released. 28 refs., 15 figs., 1 tab.« less