中文摘要：

以某化工企业有机物污染浅层土为对象,应用4种固化药剂进行固化稳定化修复对比研究。通过现场异位固化稳定化结合室内无侧限抗压强度、毒性浸出等试验,讨论了固化剂组份、龄期对其物理力学性质和浸出特性影响,并对比分析了其固化稳定化效果及机理。结果表明：随着养护时间增长,修复土p H值、毒性浸出溶液的有机物浓度降低,其中pH值由0 d的12.76~13.11降至28 d时的12.11~12.69,而有机物浸出浓度14d降幅在65%~100%间;干密度及无侧限抗压强度qu则稳步提高,其中干密度28 d增幅达14.4%~23.2%,而强度最大增加到122 k Pa。固化剂3和4修复污染土干密度较大,28 d密度超过1.37 g/cm~3,密实作用明显;添加固化剂会立即显著增大污染土pH值,其中固化剂4（电石渣＋凹凸棒土）各龄期pH值明显大于其他剂型;各固化剂对不同有机污染物的稳定效果有所差别,但均能有效固化稳定化苯胺、2-氯酚、萘、苯、甲苯、邻-二甲苯;就污染物总体固化稳定化效果而言,含活性炭组分的固化剂1效果最为突出,其总稳定率接近100%;含水泥组分的固化剂2,3对土体的增强作用较好,其28 d强度可达109 k Pa以上。相较其他药剂,固化剂4在成本、能耗及污染物排放方面表现最优,且能较好满足场地修复对有机物稳定率及强度的要求,综合效果最佳,为优选的最佳剂型。

英文摘要：

4 kinds of binders are utilized to remedy the organically contaminated soil. The effects of curing age and binder type on physico-mechanical and environmental safety properties of the stabilized soils as well as the remediation efficiencies and mechanisms are studied by analyzing the results of ex-situ S/S and laboratory tests, such as unconfined compression strength tests and toxicity characteristic leaching procedure. The results show that with the increasing age, p H of soil and organic concentrations of leachate decrease while the dry densities and qu increase steadily. The dry densities of soil remedied by binders No. 3 and No. 4 are higher than those by other binders and over 1.38 g/cm~3 after 28 days. The p H values of soil greatly increase with the addition of binders and are the highest for binder No. 4（calcium carbide residue ＋ attapulgite）. 4 kinds of binders have different remediation effects on organic contaminants owing to different organic types, and they all have high removal efficiencies for aniline, 2-chlorophenol, naphthalene, benzene, methylbenzene and o-Xylene. In point of the overall effectiveness, activated carbon-based binder No. 1 is the best because its total removal efficiency approaches 93%. The qu of soils stabilized by cement-based binders No. 2 and No. 3 is higher than that of other binders and over 109 k Pa after 28 days. Binder No. 4 is optimum for the re-use of organically contaminated soil because of its low cost, low energy consumption, low pollutant emission, high qu and total removal efficiency.