施用垃圾堆肥土壤重金屬在不同溫度和酸雨條件下的淋溶特征
更新時間:2014-07-17 16:34
來源:環(huán)境工程學報
作者:
閱讀:1906
中文摘要: |
采用淋洗法,研究了垃圾堆肥中重金屬在不同溫度與模擬酸雨條件下的淋溶特征。結(jié)果表明,隨著淋洗次數(shù)的增加,淋洗液中Cd、Cr、Cu、Ni和Pb的含量都有很大程度的減少。Cd、Cr、Cu和Ni 4種金屬在模擬酸雨的情況下淋出量明顯高于蒸餾水的情況,增幅都在116%和351%之間,差異顯著(P<0.05)或極顯著(P<0.01),而酸雨對Pb的淋出影響較小。在酸雨淋洗下,重金屬的淋出率在30℃時達到最大,其中Ni隨著溫度的變化相對較小。而在蒸餾水淋洗下,重金屬的淋出率隨著溫度的變化相對平穩(wěn)。此外,5種重金屬的淋出率明顯不同,其中Cr和Ni的淋出率相對較大,Pb最小。 |
英文摘要: |
A column experiment was performed to investigate the leaching characteristics of heavy metals of MSW compost in the soil under different temperatures and simulated acid rain. The results showed that the contents of Cd, Cr, Cu, Ni and Pb in the leachates decreased with leaching time. Simulated acid rain was more efficient than distilled water to enhance the leaching of Cd, Cr, Cu, and Ni, and increased by 116% to 351%, with significant (P<0.05) or very significant (P<0.01) differences. However, the application of simulated acid rain had little effect on Pb. The leaching rate of heavy metals was maximum at about 30℃ when leached by simulated acid rain, while Ni changed little with temperatures. When leached by distilled water, the leaching rate of heavy metals were little changed with temperatures. In addition, the leaching rates varied with 5 heavy metals, Cr and Ni were relatively large, Pb was minimum. |
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