석탄재 지오폴리머의 환경영향 비교에 관한 연구

안중우¹, 김영실¹, 양인목¹, 이수정^*, 조봉규^**, 조영주^**

A study on the environmental impact comparison of geopolymers manufactured of coal combustion ashes

Joong Woo Ahn¹, Youngsil Kim¹, Inmog Yang¹, Sujung Lee^*, Bong Gyoo Cho^**, Youngju Cho^**

¹성신여자대학교

^*한국지질자원연구원

^**폐금속·유용자원재활용기술개발사업단

¹Sungshin Women's University

^*Korea Insitute of Geoscience and Mineral Resources

^**R&D Center for Valuable Recycling

ⓒ Copyright 2015 The Korea Society for Life Cycle Assessment. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Published Online: Oct 31, 2015

Abatract

This study has been carried out to evaluate environmental values of a coal ash recycling technology and suggest directions for improving environmental performance of the recycling technology. As the results of comparing the global warming environmental impacts of 3 types of geopolymers produced by fly ash, middle ash, and bottom ash with the impact of portland cement, Fly ash geopolymer showed 19%, Middle ash geopolymer 51%, Bottom ash geopolymer showed 133% of the impact of portland cement. The impact of Bottom ash geopolymer can be improved by reducing water use and wastewater recycling. In the case of Fly ash geopolymer and Middle ash geopolymer, energy efficiency and sodium silicate input have been found as material factors. The limitation of this study is not to consider the value of new recycling material, additional burden of coal ash dumping, and low efficiency of small amount production of a development stage. It can be inferred that the actual environmental impact of geopolymers would be lower.