BOSCOV – Livro Geotecnia Ambiental – Download as PDF File .pdf) or view presentation slides online. Maria Eugenia Gimenez Boscov is the author of Geotecnia Ambiental ( avg rating, 1 rating, 0 reviews). Projeto de Gestão Ambiental Integrada da Região do Bico do Papagaio. Zoneamento Boscov, M.E.G., Geotecnia Ambiental. Oficina de Textos, São.
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Skip to boscpv content. Log In Sign Up. This paper presents an investigation of subsoil contamination underneath an unlined leachate pond in a year old dumpsite in the state of Sao Paulo, Brazil, which currently is going through a process of reclamation to turn it into a sanitary landfill with adequate protection to the environment and human health.
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Soil samples were collected in three profiles located inside the area of the leachate pond at 6 depths ranging from the subsoil surface until 4- m depth. Arsenic, cadmium, lead, copper and chromium were determined in the natural uncontaminated soil, in the leachate sludge deposited in the bottom of the pond and in the contaminated soil samples.
Results showed that the tropical sandy soil that composed the landfill foundation retained the investigated metals, so that their concentrations did not exceed limit acceptable values of soil contamination from the state of Sao Paulo.
These results are consistent with mabiental studies on metal transport and retention in tropical soils. In order to prevent subsoil contamination, bottom drainage and liner systems must be included in the design of sanitary landfills, i.
MSW disposal sites with elements and operational procedures that guarantee protection to the environment and human health. Since the end of last century, waste disposal in dumps – sites which receive wastes without any environmental protection – became heotecnia in several countries.
In Brazil, inadequate disposal sites must be eradicated until in accordance with a federal law BRASIL, ambiemtal considering the estimated daily MSW generation ofton inonly Dumpsites can be scientifically investigated to obtain contamination profiles due to leachate seepage and therefore assess soil properties relative to pollute transport and retention with a view at improving the design boscoov new MSW landfills Ferrari et al.
This paper presents the exhumation of contaminated soil samples under an unlined leachate lagoon located in Botucatu Municipal Landfill and the results of chemical analyses to determine metal contamination in the site.
This landfill, which activities started inwas inadequately operated from the beginning untilwhen a reclamation plan was implemented to turn it into a sanitary lanfill.
The landfill location is presented in Figure 1. Figure 1 — Location of Botucatu Municipal Landfill regional and local views. Serra Geral Formation comprises a set of basaltic rocks originated from volcanic flows which are intercalated with eolian fine-grained sandstone deposits. Soil characterization Geotechnical characterization of the local soil is presented in Table 1.
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X-ray diffraction detected the presence of quartz, kaolinite, gibbsite, hematite and anatase. X-ray fluorescence semi-quantitative analysis showed predominance of Si, Al e Fe, compatible to the mineralogical composition. Other results of chemical analysis of the local soil are presented in Table 2.
L solution 4,4 -1 P mg. Leachate pond Untilthe leachate generated in Botucatu Municipal Landfill was mainly stored in an unlined pond Figure 2without compacted clay liner and geomembrane.
The approximate dimensions of the pond were: Figure 2 View of the unlined leachate pond. Figure 3 presents a schematic diagram of the pond profile. As observed by Ferrari et al. The unlined leachate pond was deactivated and emptied after a new lined pond was built. This opportunity was taken to collect samples of the subsoil under the pond area to assess the contamination profile.
Background concentrations in the local soil were determined by sampling uncontaminated local soil outside the range of the landfill influence, i. The samples were cubic with side length of 0. The location of the sample collection point is shown in Figure 1. Contaminated soil sampling Samples of contaminated soil were collected at three profiles located inside the area of the former leachate pond at 6 depths: The planned location of the boreholes is presented as red points in Figure 4.
After the pond was emptied, it was observed that the bottom had low bearing capacity, what turned the security of the probing team difficult to guarantee both in terms of accessibility to the pond and subsoil sampling. Sampling operations had to be changed Figure 5 the profiles had to be relocated. The final location can be viewed as green points in Figure 4. Figure 5 — Soil sampling.
Soil sampling was performed with a regular auger. When the sampling depth was reached, the auger extremity was manually washed with Milli-Q water before the sample collection, thus avoiding cross-contamination. During these operations it was observed that soil voids were filled with sludge down to the depth of 0.
All laboratory apparatuses e. EPA, developed for partial extraction of metals. A soil sample of 0. The vessel was sealed and heated in a pre-defined sequence in the microwave: After cooling, the vessel content was filtered and diluted with Milli-Q water to a predetermined volume. The liquid sample was then submitted to chemical analysis.
For each field sample, triplicates were used to improve the accuracy of the results. For each round of microwave heating one vessel containing only 10 mL of nitric acid was used as a blank boscoov. The elements arsenic, cadmium, chromium, copper and lead were determined with about 5-mL liquid sample of the each solution.
Reference source not found. Table 3 — Metal concentration in the natural soil background and leachate sludge. SardiniaFourteenth International Waste Management and Landfill Symposium Figure 8 – Lead concentration in the subsoil underneath the leachate pond. For all the analyzed chemical elements, the concentrations in the subsoil range between the concentrations of the soil background uncontaminated natural soil and of the leachate sludge, except for isolated two values of arsenic concentration.
Arsenic and cadmium were not detected in the chemical analysis, geotecniq. This situation was also observed by Ferrari et al. SardiniaFourteenth International Waste Management and Landfill Symposium These results are consistent with many other studies on transport and retention of metals in tropical soil Boscov, The author would also like to express their thanks to: Board Decision number E. Exhumation of an unlined leachate lagoon — a case study. Tata McGraw Hill Education, p.
Margarita di Pula, Cagliari. Microwave assisted acid digestion of aqueous samples and extracts. Remember me on this computer. Enter the email address you signed up with and we’ll email you a reset link. Click here to sign up. Help Center Find new research papers in: