Sur Ioana Monica, Micle Valer, Hegyi Andreea, Lăzărescu Adrian-Victor
Department of Environment Engineering and Entrepreneurship of Sustainable Development, Faculty of Materials and Environmental Engineering, Technical University of Cluj-Napoca, 103-105 Muncii Avenue, 400641 Cluj-Napoca, Romania.
NIRD URBAN-INCERC Cluj-Napoca Branch, 117 Calea Floresti, 400524 Cluj-Napoca, Romania.
Materials (Basel). 2022 Jun 2;15(11):3973. doi: 10.3390/ma15113973.
Environmental pollution has particular implications for the whole geosystem and increases the global risk to human and ecological health. In this regard, investigations were carried out on soil samples to perform the quality status assessment by determining: pH, texture, structure and metal concentration, as well as carrying out an assessment of anthropogenic activity by determining pollution indices: C (contamination factor), C (degree of contamination), PLI (pollution load index), E (ecological risk index) and PERI (potential ecological risk index). Analyses on soil samples showed high concentrations of metals (Cu: 113-2996 mg kg; Pb: 665-5466 mg kg; Cr: 40-187 mg kg; Ni: 221-1708 mg kg). The metal extraction experiments were carried out by bioleaching using , microorganisms at different amounts of bioleaching solution (20 mL and 40 mL 9K medium) and a stirring time of up to 12 h. The results on the degree of contamination, pollution loading index PLI (2.03-57.23) and potential ecological risk index PERI (165-2298) indicate that the soils in the studied area have a very high degree of pollution. The decontamination procedure by bioleaching showed a decrease, but at the end of the test (12 h), the followed indices indicate high values, suggesting that bioleaching should continue. The depollution yield after 12 h of treatment is, however, encouraging: Cu 29-76%, Pb: 10-32%, Cr: 39-72% and Ni 44-68%. The use of yield-time correlation equations allows the identification of the optimal exposure time on the bioleaching extraction process to obtain optimal results. The aim of the research is to determine the soil quality, soil environmental risk, extraction of metals from polluted soils by bioleaching and to identify influencing factors in achieving high remediation yields.
环境污染对整个地球系统有着特殊影响，并增加了对人类和生态健康的全球风险。在这方面，对土壤样本进行了调查，通过测定pH值、质地、结构和金属浓度来进行质量状况评估，并通过测定污染指数来评估人为活动：C（污染因子）、C（污染程度）、PLI（污染负荷指数）、E（生态风险指数）和PERI（潜在生态风险指数）。对土壤样本的分析显示金属浓度很高（铜：113 - 2996毫克/千克；铅：665 - 5466毫克/千克；铬：40 - 187毫克/千克；镍：221 - 1708毫克/千克）。金属提取实验通过生物浸出进行，使用不同量的生物浸出溶液（20毫升和40毫升9K培养基）的微生物，搅拌时间长达12小时。关于污染程度、污染负荷指数PLI（2.03 - 57.23）和潜在生态风险指数PERI（165 - 2298）的结果表明，研究区域的土壤污染程度非常高。生物浸出的去污程序显示有所下降，但在试验结束时（12小时），后续指数仍显示出高值，这表明生物浸出应继续进行。然而，处理12小时后的去污率令人鼓舞：铜为29 - 76%，铅为10 - 32%，铬为39 - 72%，镍为44 - 68%。使用产率 - 时间相关方程可以确定生物浸出提取过程的最佳暴露时间，以获得最佳结果。该研究的目的是确定土壤质量、土壤环境风险、通过生物浸出来自污染土壤的金属提取，并确定实现高修复产率的影响因素。
