SEGH Events

15th International Congress of the Geological Society of Greece

22 May 2019
Athens, Greece
The International Congresses of the Geological Society of Greece are multidisciplinary earth science events, focusing on, but not limited to, the broader Aegean region and its surroundings, with the view to highlighting the contribution of geosciences to the study of natural resources, natural hazards and environment.

The 15th International Congress of the Geological Society of Greece – GSG2019: “Understanding and Protecting our Living Planet Earth”, will be held at the premises of Harokopio University, Athens, Greece, between 22-24 May 2019. SEGH will be joint convening the special session T4.S1: Geochemical mapping for environmental and resource management.

(Image credit: GSG 2019)

Geochemical mapping for environmental and resource management (T4.S1)

(Jointly organized by the IUGS Commission on Global Geochemical Baselines (CGGB); the Society for Environmental Geochemistry and Health (SEGH); and the EuroGeoSurveys Geochemistry Expert Group)

Conveners: Ar. Argyraki, (NKUA), A. Liakopoulos (IGME), A. Demetriades (IUGS-CGGB)

Keynote Speakers: Anna Ladenberger, Geological Survey of Sweden and Andrew Hursthouse, Univ. of the West of Scotland, UK


Session description: Geochemical maps are the principal means of presenting the spatial distribution of chemical elements and compounds in materials occurring at or below the Earth’s surface. The patterns revealed by geochemical mapping can provide information on a wide range of Earth processes at different scales, from nanometres to thousands of kilometres.

For example, continental- and regional-scale geochemical projects can identify districts of enhanced mineral potential within which targeted exploration can be conducted. They also provide the geochemical baseline that is required to evaluate effectively local-scale environmental projects. Mapping at a sub-mineral-grain scale can provide a basis for understanding mineralisation processes and to determine optimal strategies for extraction of valuable target elements, while the sub-micron distribution of trace elements in Earth materials can provide insights into their speciation, environmental fate and bioavailability. The focus of the session will be on geochemical surveys at all mapping scales for the study of the environment and natural resources. Our main objective is to provide the opportunity for young researchers to present their work and benefit from the interaction with well- established applied geochemistry experts. We particularly welcome studies that have combined geochemical data with data from other sources in order to provide tools for effective environmental and resource management.

For more information, please visit the GSG 2019 website

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Science in the News

Latest on-line papers from the SEGH journal: Environmental Geochemistry and Health

  • Membrane fouling control by Ca 2+ during coagulation–ultrafiltration process for algal-rich water treatment 2019-04-16

    Abstract

    Seasonal algal bloom, a water supply issue worldwide, can be efficiently solved by membrane technology. However, membranes typically suffer from serious fouling, which hinders the wide application of this technology. In this study, the feasibility of adding Ca2+ to control membrane fouling in coagulation–membrane treatment of algal-rich water was investigated. According to the results obtained, the normalized membrane flux decreased by a lower extent upon increasing the concentration of Ca2+ from 0 to 10 mmol/L. Simultaneously, the floc particle size increased significantly with the concentration of Ca2+, which leads to a lower hydraulic resistance. The coagulation performance is also enhanced with the concentration of Ca2+, inducing a slight osmotic pressure-induced resistance. The formation of Ca2+ coagulation flocs resulted in a looser, thin, and permeable cake layer on the membrane surface. This cake layer rejected organic pollutants and could be easily removed by physical and chemical cleaning treatments, as revealed by scanning electron microscopy images. The hydraulic irreversible membrane resistance was significantly reduced upon addition of Ca2+. All these findings suggest that the addition of Ca2+ may provide a simple-operation, cost-effective, and environmentally friendly technology for controlling membrane fouling during coagulation–membrane process for algal-rich water treatment.

  • Evaluation of the raw water quality: physicochemical and toxicological approaches 2019-04-13

    Abstract

    Environmental degradation has increased, mainly as a result of anthropogenic effects arising from population, industrial and agricultural growth. Water pollution is a problem that affects health, safety and welfare of the whole biota which shares the same environment. In Goiânia and metropolitan region, the main water body is the Meia Ponte River that is used for the abstraction of water, disposal of treated wastewater and effluents. In addition, this river receives wastewater from urban and rural areas. The aim in this present study was to evaluate the quality of raw water by some physical, chemical and toxicological tests. The physicochemical results found high levels of turbidity, conductivity, aluminum, phosphorus and metal iron, manganese, copper and lithium when compared to the standards of the Brazilian legislation. The values found of toxicity demonstrated a high degree of cytotoxicity and genotoxicity. Therefore, it was concluded that the Meia Ponte River has been undergoing constant environmental degradation, causing the poor quality of its waters. Thus, measures for the prevention and recovery should be adopted for the maintenance of the Meia Ponte River.

  • Review of the nature of some geophagic materials and their potential health effects on pregnant women: some examples from Africa 2019-04-11

    Abstract

    The voluntary human consumption of soil known as geophagy is a global practice and deep-rooted in many African cultures. The nature of geophagic material varies widely from the types to the composition. Generally, clay and termite mound soils are the main materials consumed by geophagists. Several studies revealed that gestating women across the world consume more soil than other groups for numerous motives. These motivations are related to medicinal, cultural and nutrients supplementation. Although geophagy in pregnancy (GiP) is a universal dynamic habit, the highest prevalence has been reported in African countries such as Kenya, Ghana, Rwanda, Nigeria, Tanzania, and South Africa. Geophagy can be both beneficial and detrimental. Its health effects depend on the amount and composition of the ingested soils, which is subjective to the geology and soil formation processes. In most cases, the negative health effects concomitant with the practice of geophagy eclipse the positive effects. Therefore, knowledge about the nature of geophagic material and the health effects that might arise from their consumption is important.