The Release of Heavy Metals from Hardening Slurries with Addition of Selected Combustion By-products
Małgorzata Wojtkowska , Paweł Falaciński , Anna Kosiorek
AbstractIn Poland, in recent years, there has been a rapid accumulation of sewage sludge - a by-product in the treatment of urban wastewater. This has come about as a result of infra-structure renewal, specifically, the construction of modern sewage treatment plants. The more stringent regulations and strategic goals adopted for modern sewage management have necessitated the application of modern engineering methodology for the disposal of sewage sludge. One approach is incineration. As a consequence, the amount of fly ash resulting from the thermal treatment of municipal sewage sludge has grown significantly. Hence, intensive work is in progress for environmentally safe management of this type of waste. The aim of the experiment was to evaluate the possibility of using the fly ash that results from municipal sewage sludge thermal treatment (SSTT) as an additive to hardening slurries. This type of hardening slurry with various types of additives, e.g. coal combustion products, is used in the construction of cut-off walls in hydraulic structures. The article presents the techno-logical and functional parameters of hardening slurries with an addition of fly ash obtained by SSTT. Moreover, the usefulness of these slurries is analysed on the basis of their basic properties, i.e. density, contractual viscosity, water separation, structural strength, volumetric density, hydraulic conductivity, compressive and tensile strength. The mandated require- ments for slurries employed in the construction of cut-off walls in Floyd embankments are listed as a usefulness criteria. Subsequently, leaching tests were performed for heavy metals in the components, the structure of the hardening slurries. An experiment showed leaching of hazardous compounds at a level allowing their practical application. The article presents the potential uses of fly ash from SSTT in hardening slurry technology. It also suggests directions for further research to fully identify other potential uses of this by-product in this field.
|Other language title versions||Uwalnianie metali ciężkich z zawiesin twardniejących z dodatkiem wybranych ubocznych produktów spalania|
|Journal series||Inżynieria i Ochrona Środowiska, ISSN 1505-3695, e-ISSN 2391-7253|
|Publication size in sheets||0.6|
|Keywords in Polish||zawiesina twardniejąca, lotny popiół z termicznego przekształca nia komunalnych osadów ściekowych, przesłony przeciwfiltracyjne, metale ciężkie|
|Keywords in English||hardening slurry, fly ash from thermal treatment of municipal sewage sludge, cut-off walls|
|Score|| = 9.0, 28-11-2017, ArticleFromJournal|
= 9.0, 28-11-2017, ArticleFromJournal
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