Properties of a Lateritic Red Soil for Pollutant Containment

Boscov, Maria Eugênia Gimenez; Hachich, Waldemar Coelho; Mahler, Cláudio Fernando; Oliveira, Elisabeth de

doi:10.4236/jep.2011.27105

Cited by 5 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When wet, there is usually no significant swelling or loss of resistance in lateritic clays. However, there is considerable shrinkage when they lose water [8]. In their natural conditions, a number of lateritic clay soils have poor engineering qualities, occasionally exhibiting severe swelling, low strength, excessive plasticity, and a large drop in strength when exposed to water [1].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Geotechnical Properties of Lateritic Clay with Sawdust Ash-Lime Stabilizer

2023

View full text Add to dashboard Cite

One important means of refining the geotechnical characteristics of soils is stabilization. This research sought to improve the geotechnical properties of lateritic clayey soil using sawdust ash-lime (SDAL) stabilizer. Soil-SDAL mixtures were made, after collecting lateritic clay samples and preparing mixtures of lime and sawdust ash in a ratio of 1:2. SDAL mixtures were added to the lateritic clay in increasing percentages from 0 to 10%. The materials’ index properties were determined, and compaction of the Soil-SDAL mixtures was done using four compactive efforts namely Reduced British Standard Light (RBSL), Standard Proctor (SP), West African Standard (WAS), and Modified Proctor (MP). Unconfined compressive strength (UCS) tests were performed on the Soil-SDAL mixtures as well. Results of the tests showed that the soil could be classified as an A-7-5(7) soil with a 13.7% plasticity index. The plasticity index increased with the addition of SDAL mixtures up to 6% after which there was a gradual decline. Meanwhile, maximum dry density (MDD) decreased while optimum moisture content (OMC) increased with SDAL addition. Unconfined compressive strength (UCS) of the soil increased from 38.58kN/m2 at 0% SDAL to a maximum of 129.63kN/m2 at 6% SDAL, after which there was a gradual decrease. Similar trends were noticed at all compactive efforts, indicating consistency in the performance of the stabilizer. Optimum results were achieved at 6% SDAL content, with Modified Proctor compactive effort giving the maximum value of 1,860kg/m3 MDD. The results prove that sawdust ash-lime mixture offers tremendous abilities in improving lateritic clay soil properties.

show abstract

Section: Introductionmentioning

confidence: 99%

Enhancing Geotechnical Properties of Lateritic Clay with Sawdust Ash-Lime Stabilizer

2023

View full text Add to dashboard Cite

show abstract

“…Most studies on the retention of heavy metals in soils are limited to soils from temperate climate regions [22]. In the past decades tropical soils have also been investigated [23]; however, related studies using soils of the Brazilian semiarid region are scarce [24][25][26]. Since the 1970s, this region has been affected by severe anthropic hazards; together with the substantial increase in solid waste generation, this has resulted in landscape transformation [27].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Heavy Metals on Bentonitic Soil for Use in Landfill Liners

Silva

Boscov²,

Costa

et al. 2023

Adsorption Science & Technology

Self Cite

View full text Add to dashboard Cite

Hazardous heavy metal ions such as copper, zinc, nickel, chromium, cadmium, and lead engender a potential risk to human health. Among the processes involved in the retention of these contaminants, adsorption is advantageous for removing toxic metals because of its environmentally friendly aspect, efficiency, and low-cost operation. Information on the adsorption of heavy metals in soils from the semiarid region of northeastern Brazil is still scarce. In this study, the adsorption of heavy metals (Cd, Cu, Zn, Ni, and Pb) by a semiarid Brazilian bentonitic soil is investigated. This soil has been used as a bottom liner in an experimental municipal solid waste (MSW) cell located in Campina Grande, State of Paraíba, Brazil. The experimental cell consists of a landfill unit on an experimental scale, with the same constructive elements of a sanitary landfill. Disturbed and undisturbed samples of the investigated soil were collected at a quarry in the rural zone of Boa Vista (state of Paraiba, Northeast Brazil). Sorption attributes were determined via batch tests with a soil-solution ratio of 1 : 12.5 (4 g of dry soil to 50 mL of solution). Linear, Freundlich, and Langmuir isotherms were fitted to the experimental data, using as fitting parameters Pearson correlation coefficient ( R 2 ) and p value with a significance level α = 5 % . The ascending order of maximum adsorption capacity for heavy metals followed the series Ni < Cr < Zn < Cd < Cu < Pb. The maximum adsorbent capacities obtained were similar to those of other Brazilian soils and other adsorbents. Therefore, the studied soil has a high potential to be used in the retention of heavy metals.

show abstract

“…Several studies have addressed metal behavior in different soils, such as Zuquette et al (2008); Korf (2011);Braz et al (2013); Odukoya et al (2013); Diagboya et al (2015), Zia et al (2018); Gabarrón et al (2018); Colzato et al (2018). Other researchers specifically studied the use of tropical soils as liners for waste disposal (Boscov et al 1999;Afolayan and Nwaiwu 2005;Knop et al 2008;Boscov et al 2011;Morandini and Leite 2015;Agbenyeku et al 2016;Miguel et al 2017;Onyelowe et al 2019;Ehrlich et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of lead (Pb) in strongly weathered tropical soil (Ribeira Valley region - Brazil)

et al. 2019

View full text Add to dashboard Cite

Lateritic soils have been widely used in the construction of landfill base liners for municipal and industrial waste. On the other hand, there is little practice in the use of strongly weathered residual soils for this finality. The use of local soil for the construction of liners in order to waterproof and retain contaminants represents an alternative to control this type of contamination. Thus, the objective of this study was to determine the physical and chemical properties of a strongly weathered tropical soil (residual soil) collected in the city of Eldorado Paulista (Ribeira Valley), and to evaluate the abilityof this soil to adsorb lead (Pb). The contamination of soil and water by Pb due to inadequate mining waste disposal is common in this region. The Pb was adsorbed by the residual soil, mainly at the lowest initial concentrations. When the initial concentration of 20 mg L-1 was used, the adsorption percentage of Pb was 92.5% and when the initial concentration was 100 mg L-1, the adsorption rate was 81.7%. In addition to the retention of Pb, this soil presented the following characteristics which are favorable for using soils in the construction of liners: fine granulometry, liquid limit (LL) of 57%, plasticity index (PI) of 33%, oxidizing medium and the predominance of negative charges on the surface of the colloidal particles. Thus, it is concluded that the weathered tropical residual soil exhibits characteristics that allow it to be used as a liner in the disposal of residues containing Pb.

show abstract

Properties of a Lateritic Red Soil for Pollutant Containment

Abstract: In many regions of Brazil, lateritic

Cited by 5 publications

References 7 publications

Enhancing Geotechnical Properties of Lateritic Clay with Sawdust Ash-Lime Stabilizer

Enhancing Geotechnical Properties of Lateritic Clay with Sawdust Ash-Lime Stabilizer

Adsorption of Heavy Metals on Bentonitic Soil for Use in Landfill Liners

Adsorption of lead (Pb) in strongly weathered tropical soil (Ribeira Valley region - Brazil)

Contact Info

Product

Resources

About