Battaglia A, Calace N, Nardi E, Petronio B M, Pietroletti M
Department of Chemistry, University La Sapienza, Rome, Italy.
Bioresour Technol. 2007 Nov;98(16):2993-9. doi: 10.1016/j.biortech.2006.10.007. Epub 2006 Nov 27.
In the last few years solidification/stabilisation of acidic soils polluted by heavy metals with low-cost sorbents has been investigated. Paper mill sludges are produced in large amounts and their disposal is a serious environmental problem. The possibility was therefore studied of using paper mill sludge as a stabilizer to reduce the bioavailable metal forms in polluted soils and thus the transferability of metals to plants (barley). We first investigated the sorbing properties of paper mill sludge for Zn(II) and Pb(II) and then their fractionation both in a polluted soil and in the same soil amended with paper mill sludge in order to check the decrease in mobile forms. Finally in both soils we tested the uptake of two metals by common barley in order to assess the performance of soil remediation from an ecological point of view. The addition of paper mill sludge to a soil contaminated by lead and zinc induces a decrease in the mobile forms of both metals, probably due to the presence in sludge of organic matter and kaolinite, which are able to bind the metals very strongly. The decrease in the mobile forms, which are the most readily available for uptake by plants, corresponds to a decrease in plant uptake.
在过去几年中，人们对利用低成本吸附剂固化/稳定受重金属污染的酸性土壤进行了研究。造纸厂污泥产量巨大，其处置是一个严重的环境问题。因此，研究了利用造纸厂污泥作为稳定剂来减少污染土壤中生物可利用的金属形态，从而降低金属向植物（大麦）的转移能力。我们首先研究了造纸厂污泥对锌（II）和铅（II）的吸附特性，然后对污染土壤以及添加了造纸厂污泥的同一土壤中的金属进行分级，以检查可移动形态的减少情况。最后，在这两种土壤中，我们测试了普通大麦对这两种金属的吸收情况，以便从生态学角度评估土壤修复的效果。向受铅和锌污染的土壤中添加造纸厂污泥会导致两种金属的可移动形态减少，这可能是由于污泥中存在能够强烈结合金属的有机物和高岭土。植物最容易吸收的可移动形态的减少，相应地导致了植物吸收量的降低。
