【摘要】：針對(duì)填埋場(chǎng)黏土襯墊受重金屬離子侵蝕的現(xiàn)狀,采用污泥焚燒灰摻入黏土中制成改性黏土,在室內(nèi)模擬填埋場(chǎng)襯墊受Cd(Ⅱ)污染的工況,通過靜態(tài)平衡吸附試驗(yàn),評(píng)價(jià)改性黏土對(duì)Cd(Ⅱ)的吸附效果;通過低溫氮?dú)馕皆囼?yàn),分析改性黏土吸附Cd(Ⅱ)后的孔隙結(jié)構(gòu)變化規(guī)律;通過污染物阻滯試驗(yàn)評(píng)價(jià)改性黏土阻滯污染物下滲的能力.結(jié)果表明:改性黏土對(duì)Cd(Ⅱ)的吸附屬于Langmuir吸附模型,含污泥灰的改性黏土對(duì)Cd(Ⅱ)的理想最大吸附量增加31.9%~47.5%;吸附Cd(Ⅱ)后的改性黏土吸附-脫附等溫線屬于Ⅳ型,并出現(xiàn)H3型滯回環(huán),污泥灰摻量3%試樣的比表面積為109.90 m2/g,比未摻污泥灰試樣大14.9%;土層孔隙水中Cd(Ⅱ)的濃度隨著土層深度的增加而減少,深度達(dá)到17 cm時(shí),孔隙水中已無法檢出Cd(Ⅱ)的存在,在相同土層深度處,含污泥灰試樣的孔隙水中Cd(Ⅱ)濃度低于未摻污泥灰試樣.
[Abstract]:In view of the current situation of the clay liner of landfill site being corroded by heavy metal ions, the modified clay was made by mixing sludge incineration ash into clay, and the static equilibrium adsorption test was carried out to simulate the condition of CD (鈪，

本文編號(hào)：2129504