| 污水厂污泥碱式胶凝稳定化研究 |
| 摘要点击 5312 全文点击 2123 投稿时间：2008-07-12 修订日期：2008-09-18 |
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| 中文关键词 污泥 氯氧镁 稳定化 强度 重金属 |
| 英文关键词 sewage sludge magnesium oxychloride stabilization compressive strength heavy metals |
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| 中文摘要 |
| 采用氯氧镁稳定剂对污水厂污泥进行了稳定化实验.结果表明，氯氧镁中的MgCl2具有高吸水性，MgCl2对每100 g污泥的吸水效率可以达到1.55 mL/g，同时氯氧镁稳定剂在污泥中发生水化反应，还能结合部分水分，可以有效降低污泥的含水率.氯氧镁凝结硬化后的3相和5相为晶体结构，使污泥抗压强度可以达到85.14 kg/cm2, 最佳的MOC/污泥=3/100，MgO/MgCl2=3/1.同时污泥中的Si2+、Al3+、Cu2+等离子在Mg2+和OH-激发下形成了Mg-Si-Al凝胶体系，对污泥中的重金属离子有稳定化作用.浸出实验表明,稳定化污泥中Cu、Zn、Cd、Cr、As 的含量均低于浸出标准值. |
| 英文摘要 |
| Magnesium oxychloride cement (MOC) was used for the stability agent in the stabilization experiments of sewage sludge. It is found that MgCl2 in MOC is a kind of water-absorbent, water absorption of MgCl2 can be achieved at 1.55 mL/g (per 100 g sludge). Meanwhile, some water in sludge can be combined with MOC in the hydration reaction and sludge moisture content can be reduced efficaciously. The crystal structure of 3 phase and 5 phase, which occurred in the hydration process, makes the sludge compressive strength as high as 85.14 kg/cm2. The best ratio of MOC/sludge is 3/100， and MgO/MgCl2 is 3/1. Mg-Si-Al gel system is formed with Si2+, Al3+, Cu2+ in the sludge under alkaline condition, and it plays an important role in the stabilization of the heavy metals in sludge. Leaching experiments of sludge show that heavy metal concentrations of Cu, Zn, Cd, Cr, As in lixivium from sludge are lower than leachability standard. |
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