| 含水层介质对垃圾渗滤液污染缓冲性研究 |
| 摘要点击 2608 全文点击 1961 投稿时间：2007-03-09 修订日期：2008-05-12 |
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| 中文关键词 含水层 垃圾渗滤液 氧化还原缓冲 pH缓冲 |
| 英文关键词 aquifer landfill leachate redox buffering pH buffering |
| DOI 10.13227/j.hjkx.20090229 |
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| 中文摘要 |
| 通过土柱模拟实验研究含水层介质对垃圾渗滤液污染的pH缓冲和氧化还原缓冲性能.结果表明，碳酸钙对pH缓冲起重要作用，随着污染程度的加重，碳酸钙缓冲体系的缓冲容量逐渐增大，从背景值的1.62·pH-1 mmol/kg增加到41.3·pH-1 mmol/kg.随着污染程度的加重，含水层介质的氧化容量（OXC）减小，而还原容量（RDC）升高.在未受污染的介质中，Fe3+是OXC的主要组成，约占OXC的70.5％；TOC是RDC的主要组成，约占RDC的98.7％.物质的存在形态也与污染程度有关，在污染源附近大部分无定型态和部分晶体态Fe3+被还原，而且还原产物主要以FeCO3和FeS形式沉淀；生成Fe2+的沉积使得可离子交换态Fe2+含量由未受污染的介质中的0.5％升高至3％.因此，Fe3+是含水层介质中主要的氧化还原缓冲剂. |
| 英文摘要 |
| A column filled with fine sand was constructed to investigate pH buffering capacity and redox buffering capacity of aquifer media. Experimental results indicated that calcium carbonate played a significant role in pH buffering; with the aggravating of landfill leachate pollution, the pH buffering capacity of calcium carbonate was increased; it increased from background value, which was 1.62·pH-1 mmol/kg, to 41.3·pH-1 mmol/kg. With the aggravating of landfill leachate pollution, the oxidation capacity (OXC) of aquifer media was decreased, and the reduction capacity (RDC) was increased. In unpolluted aquifer media, Fe3+ was the main component of OXC, and accounted for about 70.5% of OXC; TOC was the main component of RDC, and accounted for about 98.7% of RDC. Species of the minerals was related to the degree of pollution; large fraction of amorphous Fe3+ and part of crystalline Fe3+ were reduced near the pollution source, and the reduced product was mainly precipitated as FeCO3 and FeS. Deposit of produced Fe2+ led to ion-exchangeable Fe2+ content increased from 0.5% of uncontaminated aquifer media to 3%. Therefore, Fe3+ may act as a very significant redox buffer in aquifer. |
