Production, Characterization and Optimization of Bricks made from a Mixed Tannery Sludge and Municipal Waste Incineration Bottom Ash (MWI-BA)
No Thumbnail Available
Date
2021-09
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Clay has been used to make bricks for thousands of years and a continuous exploitation of the top soil makes the soil loss its fertility. The chemical composition of tannery waste water treatment plant sludge is very similar to that of brick clay. As a result, the tannery sludge could be a potential substitute for brick clay. The sludge produced by the tannery waste water treatment process must be disposed of in an environmentally friendly manner. Most sludge created in treatment systems across the world is released into an open dump site, resulting in carbon emissions and harmful heavy metal leaching into the environment. The use of sludge in the production of constructional materials is regarded the most cost-effective and environmentally friendly alternative among all disposal methods. One of the waste materials emanated from waste to energy facility, which contain high silica content, and might be incorporated with tannery sludge in brick production, is bottom ash (BA). As a result, this trend offers an environmentally friendly way to reuse bottom ash. The study looked into using a mixture of tannery sludge and bottom ash to partially replace clay soil. In this study, fifteen different proportions of tannery sludge (TS) to bottom ash (BA) were investigated, with replacement levels ranging from 10% to 30% for each waste and firing temperatures of 800°C, 900°C, and 1000°C. The Ethiopian standard (ES) and the American society for testing and materials standards (ASTM) were used to determine and evaluate the engineering qualities of the bricks. In addition to this the TS-BA amended clay bricks were also compared with the control clay bricks. After the production was optimized the best conditions for producing TS-BA amended clay bricks were found to be 11.69 % tannery sludge (TS), 10.16 % bottom ash (BA), and a firing temperature (FT) of 800°C. Based on the findings, it was determined that the majority of the TS-BA amended clay bricks met both Ethiopian and ASTM specifications for fired clay bricks.
Description
Keywords
Tannery sludge (TS), Municipal waste incineration bottom ash (BA), Clay, Brick