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Publikācija: Alkali Diffusion in Porous Alkali Activated Materials

Publication Type Full-text conference paper published in other conference proceedings
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Alkali Diffusion in Porous Alkali Activated Materials
Field of research 2. Engineering and technology
Sub-field of research 2.1. Construction and transportation engineering
Authors Diāna Bajāre
Ģirts Būmanis
Keywords Water Treatment, Alkali Activated Material, pH adjustment, Heat Treatment
Abstract Chemical clarification of wastewater by using high pH coagulation–flocculation processes have been investigated in laboratory and pilot-scale experiments over the past few years. It is important that pH adjustment in the range from pH 10-11.5 in the water treatment systems is provided continuously. Present paper reveals an idea to use novel material produced by alkali activation technology in the passive system for stabilization of the pH in the high-pH–magnesium coagulation–flocculation wastewater treatment systems. It is apparent that the pore solution of AAM contains a high concentration of alkali OH− and the composition of the AAM clearly has an important effect on the diffusion of alkali from material. The AAM obtained in this research were typically low-calcium alkali activated materials based on calcined illite clay (IC). In the low-calcium systems increased amount of silica and higher Si/Al molar ratios promotes diffusion of alkali and geopolymerisation process of AMM is restricted by glass in the composition and this promotes higher leaching rate of OH−. The heat treatment of specimens facilitates the leaching of OH− ions from AAM in a prolonged period of time thus making it well suitable for use in the water treatment systems.
Reference Bajāre, D., Būmanis, Ģ. Alkali Diffusion in Porous Alkali Activated Materials. In: Non-Traditional Cement & Concrete V: Proceedings of the International Conference organized by Brno University of Technology & ŽPSV, a.s., Czech Republic, Brno, 16-19 June, 2014. Brno: 2014, pp.9-12.
ID 18361