Sustainable Utilization of Industrial Sludge in the Construction Industry

Environmental issues are being greatly exacerbated by rapid urbanization and industrialization. One of the primary challenges among these is the secure and appropriate dumping of industrial sludge produced after wastewater neutralization. Sludge is a semi-solid slurry, which includes highly toxic and harmful substances. Application of dried sludge in making bricks, concrete, and cement can be an effective method for the safe riddance of such industrial wastes. Heavy metal-containing sludge can be recycled in cement industries for cement manufacturing. Granite waste sludge can be used in making tiles. Sludge reuse in construction products is not only economical and ecologically sound but also a viable solution for two problems namely mining of clay from the earth and recycling of the waste to decrease the disposal problem. Solid waste material from industries such as pulp and paper, textile, distillery, oil, leather, and paint can be used as a possible eco-friendly ingredient to create “eco-bricks,” which would have appropriate mechanical and aesthetic qualities as well as endurance. The potential advantages of employing sludge or sludge ash in tile or brick components include lessening frost damage, heavy metal immobilization in the fired structure, oxidizing organic matter, lowering heating temperature, and eliminating pathogenic organisms during the firing process. In this chapter, we will discuss both the environmental and economic benefits of recycling and reusing industrial sludge in the construction industry, which lead to not only safe disposal of industrial waste but also reduce the burden of raw material needed for construction purposes.