酸雨作用下含磷固化劑處理鉛鋅鎘復(fù)合污染土的半動態(tài)浸出試驗研究
發(fā)布時間：2019-07-22 19:48
【摘要】：酸雨pH可顯著影響固化重金屬污染土的浸出量。定量評價固化污染土在暴露條件下(例如酸雨)對周邊水土體環(huán)境的影響,需要明確固化污染土的有效擴(kuò)散系數(shù)和阻滯因子這兩個關(guān)鍵參數(shù)�，F(xiàn)有研究多集中在固化污染土的浸出特性和表觀擴(kuò)散系數(shù),有關(guān)有效擴(kuò)散系數(shù)和阻滯因子的研究很少。本次研究旨在研究改進(jìn)的KMP固化劑固化重金屬Pb、Zn、Cd復(fù)合污染土在酸雨作用下的有效擴(kuò)散系數(shù)和阻滯因子。解吸附試驗表明,隨著污染土中重金屬Pb、Zn、Cd濃度增加,固化污染土的解吸附量增大,且解吸附曲線滿足Freundlich平衡吸附/解吸附方程。半動態(tài)浸出試驗結(jié)果表明,污染土中重金屬Pb、Zn、Cd浸出機(jī)制主要由擴(kuò)散控制,且擬合曲線斜率分別為0.60,0.56和0.61,表觀擴(kuò)散系數(shù)Dobs為1.05×10~(-16),7.84×10~(-13)和2.11×10~(-12) m~2/s。結(jié)合解吸附試驗和半動態(tài)浸出試驗結(jié)果可知,Pb、Zn、Cd的阻滯因子Rd分別為17165.6,254.6和109.3,有效擴(kuò)散系數(shù)De分別為1.82×10~(-12),1.96×10~(-10),2.34×10~(-10) m~2/s。與其他學(xué)者結(jié)果相比,固化污染土中Pb的有效擴(kuò)散系數(shù)低于其他學(xué)者的兩個數(shù)量級,而Zn和Cd的求算結(jié)果與其他學(xué)者一致。
[Abstract]:Acid rain pH can significantly affect the leaching amount of solidified heavy metal contaminated soil. To quantitatively evaluate the influence of solidified contaminated soil under exposure conditions (such as acid rain) on the surrounding water and soil environment, it is necessary to clarify the two key parameters of effective diffusion coefficient and blocking factor of solidified contaminated soil. Most of the existing studies focus on the leaching characteristics and apparent diffusion coefficient of solidified contaminated soil, but little on the effective diffusion coefficient and blocking factor. The purpose of this study was to study the effective diffusion coefficient and blocking factor of heavy metal Pb,Zn,Cd composite polluted soil cured by improved KMP curing agent under the action of acid rain. The desorption test shows that with the increase of the concentration of heavy metal Pb,Zn,Cd in the polluted soil, the desorption capacity of the solidified contaminated soil increases, and the desorption curve satisfies the Freundlich equilibrium adsorption / desorption equation. The results of semi-dynamic leaching test show that the leaching mechanism of heavy metal Pb,Zn,Cd in polluted soil is mainly controlled by diffusion, and the slope of fitting curve is 0.60,0.56 and 0.61, respectively, and the apparent diffusion coefficient Dobs is 1.05 脳 10 ~ (- 16), 7.84 脳 10 ~ (- 13) and 2.11 脳 10 ~ (- 12) m 鈮，
本文編號：2517849
[Abstract]:Acid rain pH can significantly affect the leaching amount of solidified heavy metal contaminated soil. To quantitatively evaluate the influence of solidified contaminated soil under exposure conditions (such as acid rain) on the surrounding water and soil environment, it is necessary to clarify the two key parameters of effective diffusion coefficient and blocking factor of solidified contaminated soil. Most of the existing studies focus on the leaching characteristics and apparent diffusion coefficient of solidified contaminated soil, but little on the effective diffusion coefficient and blocking factor. The purpose of this study was to study the effective diffusion coefficient and blocking factor of heavy metal Pb,Zn,Cd composite polluted soil cured by improved KMP curing agent under the action of acid rain. The desorption test shows that with the increase of the concentration of heavy metal Pb,Zn,Cd in the polluted soil, the desorption capacity of the solidified contaminated soil increases, and the desorption curve satisfies the Freundlich equilibrium adsorption / desorption equation. The results of semi-dynamic leaching test show that the leaching mechanism of heavy metal Pb,Zn,Cd in polluted soil is mainly controlled by diffusion, and the slope of fitting curve is 0.60,0.56 and 0.61, respectively, and the apparent diffusion coefficient Dobs is 1.05 脳 10 ~ (- 16), 7.84 脳 10 ~ (- 13) and 2.11 脳 10 ~ (- 12) m 鈮，
本文編號：2517849
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