Assessment of the use of industrial by-products to remediate a copper- and arsenic-contaminated soil.
Assessment of the use of industrial by-products to remediate a copper- and arsenic-contaminated soil.
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DOI：
10.2134/jeq2004.0902
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发表时间：
2004-05
影响因子：
2.4
通讯作者：
E. Lombi;R. Hamon;G. Wieshammer;M. Mclaughlin;S. McGrath
中科院分区：
文献类型：
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作者：
E. Lombi;R. Hamon;G. Wieshammer;M. Mclaughlin;S. McGrath
将两种水处理污泥（WTS-A、WTS-B）、两种红泥（RM）和红石膏（RG）以2% （w/w）的浓度添加到砷和铜严重污染的土壤中，以降低金属的生物利用度。由于改良剂将土壤pH值提高到约6，因此将相同pH值的石灰处理和未改良剂处理包括在内进行比较。各处理对黑麦草的土壤微生物量和生长均有显著的正向影响。简历。但只有WTS-A改良莴苣（lacuca sativa L. cv.）。汤姆拇指)生长。不同处理对添加铵态氮的矿化没有显著影响，而生理提取试验（PBET）表明，As的生物可及性较低（< 5%），仅在WTS-A处理下降低。土壤孔隙水中砷和可提取砷浓度仅在WTS和RG处理下降低。相比之下，土壤孔隙水和可提取铜浓度在所有处理中都有所下降，WTS、RM和RG处理的下降幅度超过84%。非同位素交换性As和Cu以胶体形式存在于土壤孔隙水中。未经处理的土壤同位素交换性砷含量< 4%，WTS、RM和RG降低了约50%。活性Cu库占总Cu库的34%，同位素交换态和可溶性Cu与土壤ph呈显著正相关。酸化处理表明，活性As和Cu在处理后的土壤中均比未处理的土壤增加。讨论了处理效果对土壤肥力的影响以及砷和铜向地下水的潜在场外迁移。
Two water treatment sludges (WTS-A, WTS-B), two red muds (RM), and red gypsum (RG), all rich in iron oxy-hydroxides, were added to a soil highly polluted with As and Cu at 2% (w/w) to reduce metal bioavailability. Because the amendments increased soil pH to approximately 6, a lime treatment to the same pH and an unamended treatment were included for comparison. All the amendments had significant positive effects on the soil microbial biomass and growth of ryegrass (Lolium multiflorum Lam. cv. Avance), but only WTS-A improved lettuce (Lactuca sativa L. cv. Tom Thumb) growth. The mineralization of added ammonium nitrogen was not significantly affected by the treatments, while a physiologically based extraction test (PBET) showed that bioaccessibility of As was low (< 5%) and decreased only in the WTS-A treatment. Concentrations of As in soil pore water and extractable As only decreased in the WTS and RG treatments. In contrast, Cu concentrations in soil pore water and extractable Cu decreased in all treatments, by more than 84% in the WTS, RM, and RG treatments. Non-isotopically exchangeable As and Cu were present in colloids in the soil pore water. Untreated soil had < 4% isotopically exchangeable As and this decreased by approximately 50%, with WTS, RM, and RG. The labile Cu pool represented a large proportion (34%) of the total Cu pool, and the isotopically exchangeable and soluble Cu were strongly correlated with soil pH. Acidification of the treated soils showed that the labile As and Cu both increased in the treated soils compared with untreated soils. The significance of the treatment effects on soil fertility and potential off-site transport of As and Cu to ground water are discussed.