Rendek Eva, Ducom Gaëlle, Germain Patrick
Laboratoire d'Analyse Environnementale des Procédés et des Systèmes Industriels, Institut National des Sciences Appliquées de Lyon, 20 avenue Albert Einstein, 69621 Villeurbanne Cedex, France.
Chemosphere. 2006 Aug;64(7):1212-8. doi: 10.1016/j.chemosphere.2005.11.053. Epub 2006 Jan 6.
The biodegradation of organic matter in municipal solid waste incinerator (MSWI) bottom ash was studied in order to investigate the interaction between the CO(2) produced by microbial respiration and bottom ash. Respiration tests were performed on bottom ash at different moisture contents in an incubator at 30 degrees C. O(2) consumption and CO(2) production were monitored and quantified. Leaching tests were carried out at the end of the experiments. Total organic carbon (TOC) leaching had decreased. Over a period of three weeks, pH decreased from 10.7 to 8.2 and bottom ash was considered to be fully carbonated. This showed that the organic matter found in bottom ash can provide a substrate for microbial activity. The CO(2) produced by microbial respiration was directly dissolved in bottom ash pore water in order to be mineralized in carbonate form. The origin of the carbon dioxide which induces maturation of bottom ash on weathering areas has never been really discussed and is often presumed to be atmospheric CO(2). However, biodegradation of organic matter could contribute for a large part to this phenomenon, depending on field-scale physico-chemical weathering conditions.
为了研究微生物呼吸产生的二氧化碳与城市固体废弃物焚烧炉（MSWI）底灰之间的相互作用，对MSWI底灰中有机物的生物降解进行了研究。在30℃的培养箱中，对不同含水量的底灰进行了呼吸试验。监测并量化了氧气消耗和二氧化碳产生情况。实验结束时进行了浸出试验。总有机碳（TOC）浸出量有所下降。在三周的时间里，pH值从10.7降至8.2，底灰被认为已完全碳酸化。这表明底灰中发现的有机物可为微生物活动提供底物。微生物呼吸产生的二氧化碳直接溶解在底灰孔隙水中，以便以碳酸盐形式矿化。导致风化区域底灰成熟的二氧化碳来源从未得到真正讨论，通常被认为是大气中的二氧化碳。然而，根据现场规模的物理化学风化条件，有机物的生物降解可能在很大程度上促成了这一现象。
