巴西半干旱区冲积土壤中镉和铜的运移:柱渗流和模拟

IF 1.9 4区 农林科学 Q3 SOIL SCIENCE Revista Brasileira De Ciencia Do Solo Pub Date : 2023-01-01 DOI:10.36783/18069657rbcs20220153
Vitor Hugo de Oliveira Barros, Adriana Thays Araújo Alves, Severino Martins dos Santos, Artur Paiva Coutinho, Laurent Lassabatere, Manuella Virgínia Salgueiro Gondim, Antonio Celso Dantas Antonino
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引用次数: 0

摘要

关于巴西纺织业,东北地区的部分地区是该国第二大纺织制造中心。尽管这一工业活动很重要,但它在处理纺织废水,特别是工业洗衣店的废水方面引起了有关的环境问题。这种废物含有许多化学物质,其中包括各种重金属。为了评估与重金属有关的环境风险,需要调查污染物的转移。通过土柱试验,评价了冲积土中重金属Cd和Cu的滞留和迁移。采用浓度为0.3 mol L -1的非反应性示踪剂(KBr),分别注入浓度为100 mg L -1和60 mg L -1的含Cu和Cd的金属溶液,进行上流式柱渗透试验。注射流速0.75 mL min -1。利用对流色散方程(CDE)和双区模型(也称为MIM (Mobile-IMmobile waters))对观测到的突破曲线进行建模,得到了水的色散参数。输运参数由两点模型(TSS)获得。用CXTFIT 2.0程序拟合模型的洗脱曲线。两点吸附模型对Cu和Cd的吸附效果最好,r2分别为0.985和0.995。R值明显高于单位,Cu的平均值为2.138,Cd的平均值为1.907。这表明这些污染物在离开色谱柱时存在延迟,这是由这些化合物与土壤的相互作用造成的。Cu和Cd的参数D值分别为3.469和5.205。因此,本研究中的金属对当地冲积含水层存在地下水污染的风险。造成这一现象的主要原因是土壤的理化特性,如高含砂量(85%)和低含OM量(2.1%)。结果还表明,与镉相比,铜的保留率更高,流动性更低,这表明镉的风险更大。
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Cadmium and copper transport in alluvial soils in the Brazilian semiarid region: column percolation and modeling
ABSTRACT Regarding the Brazilian textile industry, part of the northeast region stands out as the second-largest textile manufacturing hub in the country. Despite its importance, this industrial activity has been bringing relevant environmental concerns regarding the disposal of textile effluents, especially from industrial laundries. This waste contains many chemicals and among them are various types of heavy metals. To assess environmental risks associated with heavy metals, pollutant transfer needs to be investigated. This study evaluated the retention and mobility of heavy metals Cd and Cu in alluvial soil, through soil column tests. The up-flow column percolation tests were performed using a nonreactive tracer (KBr) at a concentration of 0.3 mol L -1 and injecting a metallic solution containing Cu and Cd at 100 and 60 mg L -1 , respectively. The injection flow rate was 0.75 mL min -1 . The hydro-dispersive parameters were obtained by modeling the observed breakthrough curves with the convection-dispersion equation (CDE) and the two-region model, also referred to as the MIM (Mobile-IMmobile waters) model. The transport parameters were obtained from the two-site model (TSS). All elution curves were fitted to the models with the CXTFIT 2.0 program. The Two-Site Sorption Model was the best for the case studied, with R 2 of 0.985 and 0.995 for Cu and Cd, respectively. The values of R were considerably higher than the unit, presenting an average of 2.138 for Cu and 1.907 for Cd. This indicates a delay of these contaminants when leaving the column, which is caused by the interaction of these chemical compounds with the soil. The values obtained for parameter D were 3.469 for Cu and 5.205 for Cd. Thus, the metals in this study present a risk of groundwater contamination for the local alluvial aquifers. The main reason for that is the physicochemical features of the soil, such as high sand content (85 %) and low OM content (2.1 %). The results also indicated greater retention and less mobility for Cu than for Cd, pointing to a greater risk for Cd.
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来源期刊
Revista Brasileira De Ciencia Do Solo
Revista Brasileira De Ciencia Do Solo 农林科学-土壤科学
CiteScore
3.00
自引率
11.80%
发文量
32
审稿时长
9-24 weeks
期刊介绍: The Revista Brasileira de Ciência do Solo is a scientific journal published by the Brazilian Society for Soil Science (SBCS), founded in 1947, and is responsible for the propagation of original and inedited technical-scientific work of interest for Soil Science. Contributions must not have been previously published or submit to other periodicals, with the only exception of articles presented in summarized form at professional meetings. Literature reviews are accepted when solicited by the Editorial Board.
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