Aluminosilicate and zeolitic materials synthesis using alum sludge from water treatment plants: Challenges and perspectives

Author(s)

Machado, Raquel Cardoso. ; Valle, Stella Fortuna do ; Sena, Thais Beatriz Miqueleti ; Perrony, Paul Esteban Pherez ; Bettiol, Wagner ; Ribeiro, Caue

• Document type: Journal article
• Source: WASTE MANAGEMENT; v. 186, p. 15-pg., 2024-06-13.

Abstract

Alum sludge (AS) is a by-product generated from drinking water treatment and produced in large amounts around the world. Its chemical composition makes this waste an emerging alternative source of silicon and aluminum for aluminosilicates or zeolite material production, which can add value to residues and contribute to the circular economy process on a global scale. In this sense, and considering the scarcity of information about AS, this review shows data collection about AS in different countries, including generation, chemical composition, and disposal information. The reuse of AS is discussed based on circular economy and the environmental gains derived from such approaches are highlighted, including the possibility of utilization with other residues (e.g., ash, bioproducts, etc). Moreover, this review shows and discusses the benefits and challenges of AS reuse in the synthesis process and how it can be a sustainable raw material for aluminosilicates and zeolite synthesis. The most common conditions (conventional or non -conventional) in zeolite synthesis from AS are mentioned and advantages, limitations and trends are discussed. The discussions and data presented can improve the AS management and reuse legislations, which certainly will collaborate with sustainable AS use and circular economy processes. (AU)

• FAPESP's process: 22/09773-1 - Development of fertilizer formulation from zeolitic concentrates obtained from WTP sludge and microorganisms
• Grantee: Raquel Cardoso Machado
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 20/12210-3 - Development of technological alternatives for the use of ETA sludge as raw material for the production of controlled release fertilizers
• Support Opportunities: Research Grants - Research Partnership for Technological Innovation - PITE
• FAPESP's process: 23/02665-1 - Production of zeolitic concentrates from WTP sludge
• Grantee: Thais Beatriz Miqueleti de Sena
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 23/01549-8 - Development of wet mechanochemical treatment for the use of WTP sludge as raw material for the production of controlled-release fertilizers
• Grantee: Cauê Ribeiro de Oliveira
• Support Opportunities: Regular Research Grants