Geologia e pedologia da bacia glacial no distrito de Sousas, Campinas, SP

Melfi, Adolpho José; Bittencourt, Igor

doi:10.1590/s0006-87051962000100046

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Itararé Supergroup in the central part of the state of São Paulo, where the study area is located, overlays the crystalline basement, whose erosive surface locally shows evidences of reworking by ice displacement, such as, for example, the Moutonnée Rock (Almeida, 1946) and glacial valleys (Melfi and Bittencourt, 1962), as observed close to Sorocaba. The Itararé Supergroup is overlain by the Rio Bonito Formation (Schneider et al, 1974) or by the Tatuí Formation (Soares et al, 1977), both deposited in postglacial environments.…”

Section: Geology Of the Study Areamentioning

confidence: 91%

Waste foundry sand. Environmental implication and characterization

Penkaitis

Sígolo

2012

Geol. USP, Sér. cient.

View full text Add to dashboard Cite

This paper presents the results of analyses using Scanning Electron Microscopy in field samples of waste foundry sand, as well as the results of granulometric, chemical and groundwater analyses. Field data allowed to characterize waste foundry sand and showed that there are elevated concentrations of metals in the groundwater (iron, manganese, boron and selenium), in addition to other potentially toxic elements (chromium, copper, cobalt, nickel, zinc, aluminum, iron, manganese), which are present in the waste and are considered not hazardous by current standards. Even if these elements are not considered hazardous, their concentrations above the permissible limit compromise the environmental quality of the site, posing risks to the local population, since they work in agriculture and use groundwater. Two different types of waste foundry sands were identified using granulometric analyses. Electron microscopy showed features related to morphological, chemical and mineralogical characteristics of grains that make up the waste. Quartz was the dominant mineral. Waste foundry sand is composed of two types of grains: a rounded grain with almost no incrustations formed during alloy production, and a second type of grain, which is not rounded, has incrustations, and always has several metals derived from alloys and associated with these incrustations. Chemical elements detected in groundwater with concentrations above the limits established by the regulatory bodies were found in wells located in the landfill area. Most of these elements show higher concentrations downstream, some of them with concentrations above the regulatory limit, and others show an increase in concentration upstream, indicating that the landfill may be impacting the local environment.Keywords: Electron microscopy; Groundwater; Solid waste; Foundry sand. ResumoEsse trabalho apresenta resultados da análise de Microscopia Eletrônica de Varredura em amostras coletadas em campo de resíduo provindo de areias de fundição. Foram também realizadas análises granulométricas e químicas, e análise das águas de percolação do resíduo. Dados obtidos em campo permitiram caracterizar o resíduo e demonstram clara e forte concentração de metais nas águas (ferro, manganês, boro e selênio) além de elementos potencialmente tóxicos (cromo, cobre, cobalto, níquel, zinco, alumínio, ferro, manganês) presentes no resíduo, considerado pela atual normatização como não perigoso. Ainda que não seja considerado perigoso, a identificação de elementos potencialmente tóxicos nas águas em concentrações acima do permitido compromete a qualidade ambiental do local, colocando em risco a população do entorno, visto que algumas propriedades vizinhas realizam cultivo agrícola e captam água do subsolo. As análises granulométricas permitiram diagnosticar dois grupos distintos de resíduos. As determinações em microscopia eletrônica exibiram variáveis quanto às características morfológicas, químicas e mineralógicas dos grãos constituintes do resíduo. Foi possível verificar que o predomín...

show abstract

Section: Geology Of the Study Areamentioning

confidence: 91%