Analysis of MSWI Fly Ash Reuse in Property and Life Cycle Assessment

• Main Authors: Tai-Yuan Huang, 黃泰元
• Other Authors: Pei-Te Chiueh
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/43771893706453919194

碩士 === 國立臺灣大學 === 環境工程學研究所 === 103 === As global population has increased, the generation of municipal solid waste has also increased and its treatment is a salient issue for many governments. Fly ash is a byproduct of solid waste incineration and is regarded as hazardous waste. Yet fly ash can be reused in cement, bricks, alkaline, aggregate sand other treatments. However, these fly ash reuse treatments might create higher environmental impacts. Therefore, the study aims to discuss the most common fly ash reuse and treatments and evaluate them by environmental impact and cost benefit analysis, to choose the better fly ash reuse treatment alternatives. This research discusses four kinds of fly ash treatments scenarios: 1) Landfill after solidification, 2) Reuse as cement, 3) Reuse as bricks, 4) Reuse as alkaline in Waelz process, and evaluates each in two parts. The first part experimental, which analyzed heavy metal composition before and after washing process. The second part is to evaluate fly ash reuse treatment by life cycle assessment. Inventory data were obtained from commercial operation factories and references, and LCA software SimaPro and environmental impact model IMPACT 2002+ were used to evaluate the outcome of LCA. It was found that although washed fly ash can stabilize toxic substances, it also can increase heavy metal concentration, In LCA portion, the highest impact scenario is scenario 2, second is scenario 1, third is scenario 3, the lowest impact is reusing as alkaline of the low impact of scenario 4 is due to the benefit from recycling zinc. Fly ash reuse treatment will be increasingly important and will require many considerations. In terms of environmental impact, this research aims to provide a holistic comparison between different fly ash reuse treatments to further recommendation of better fly ash reuse treatment.