Guimaraes A L, Okuda T, Nishijima W, Okada M
Department of Material Science and Chemical Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi Hiroshima, Hiroshima 739-8527, Japan.
J Hazard Mater. 2006 Sep 21;137(2):1096-101. doi: 10.1016/j.jhazmat.2006.03.047. Epub 2006 May 3.
The understanding of the leaching behavior of organic carbon from incinerator bottom ash is an important aspect for the control of organic carbon emissions from landfills in order to minimize their potential risk to the environment. The leaching behavior of organic carbon from incinerator bottom ash samples, obtained from two different solid waste sources, as well as the effects of calcium (Ca) on organic carbon (DOC) leaching associated with pH were therefore investigated in this paper. The effect of pH on the leaching of DOC and other major elements from bottom ash was ascertained through pH-stat leaching experiments. Column leaching experiments were carried out to evaluate the dependence of the leached amount of DOC on Ca leaching. It was found that the bottom ash produced by incineration of municipal solid waste (MSW) was composed of two DOC fractions: DOC leached independent (fraction I) of Ca leaching, observed at alkaline-neutral pH, and DOC leached dependent (fraction II) on Ca leaching, observed at acid pH. However, the bottom ash produced by incineration of industrial solid waste (ISW) was composed of only DOC fraction I. The addition of calcium oxide during incineration and the differences in the paper to plastic ratio in the physical composition of the solid wastes incinerated would explain the distinct organic carbon leaching behaviors of bottom ash samples.
了解焚烧炉底灰中有机碳的浸出行为是控制垃圾填埋场有机碳排放以将其对环境的潜在风险降至最低的一个重要方面。因此，本文研究了来自两种不同固体废物源的焚烧炉底灰样品中有机碳的浸出行为，以及钙（Ca）对与pH相关的有机碳（溶解性有机碳，DOC）浸出的影响。通过pH滴定浸出实验确定了pH对底灰中DOC和其他主要元素浸出的影响。进行了柱浸实验以评估DOC浸出量对Ca浸出的依赖性。结果发现，城市固体废物（MSW）焚烧产生的底灰由两种DOC组分组成：在碱性至中性pH下观察到的与Ca浸出无关的DOC浸出（组分I），以及在酸性pH下观察到的与Ca浸出相关的DOC浸出（组分II）。然而，工业固体废物（ISW）焚烧产生的底灰仅由DOC组分I组成。焚烧过程中氧化钙的添加以及所焚烧固体废物物理组成中纸张与塑料比例的差异可以解释底灰样品不同的有机碳浸出行为。
