USE OF SLUDGE FROM WATER TREATMENT PLANTS IN THE PRODUCTION OF BUILDING MATERIALS

Abstract

Introduction. Currently, the issue related to the utilization of sludge from water treatment plants (WTP), including in the production of building materials, is quite urgent. In this regard, the purpose of the study was to obtain new compositions of raw mixtures to manufacture building products using WTP sludge as a raw component. Methods and Materials. The paper presents the characteristics of the used binders and WTP sludge, and outlines some experimental methods. Portland cement and gypsum binder were used in non-fired materials, while clay was used in fired materials as binders. Strength properties, air and fire shrinkage were determined using standard methods. Results. Based on the analysis of the results obtained during the tests, we established that it is inexpedient to use WTP sludge without special treatment in combination with Portland cement as a binder in the production of non-fired building materials. We also developed preliminary compositions of gypsum concrete with the use of WTP sludge. Conclusion. WTP sludge can be most effectively used in the production of fired ceramic materials. However, its practical use requires more detailed research aimed at optimizing compositions and designing specific processes, including, if necessary, those related to sludge treatment.