JEOTERMAL KAYNAKLI ARSENİĞİN YERALTISUYU VE YÜZEYSELSULARDAKİ JEOKİMYASAL DAVRANIŞI: BİRLİKTE ÇÖKELME, ADSORBSİYON, pH-Eh

Abstract

Jeotermal sistemlerden kaynaklanan arsenik kirliliğinin yüzeyselsu ve yeraltısularında açığa çıkması, bu suların içme ve sulama amaçlı kullanımlarını riske sokmaktadır. Bu sulardaki, arsenik kirliliği sucul ekosistemleri de etkilemektedir. Çalışmada, Balçova (İzmir) ve Gediz Ilıca (Kütahya) jeotermal alanlarından  arseniğin, yüzeyselsu ve yeraltısularında taşınım ve türleri, depolanması ve giderim mekanizmaları incelenmektedir. Sularda, Phreeqc yazılımı ile türleştirme, çözünme/çökelme ve soğuk sular ile karışım dikkate alınmak suretiyle modellemeler yapılmıştır. Çalışmanın sonuçlarına göre, arsenik derişimlerinin mineral çökelimleri, adsorbsiyon, redoks (Eh) ve pH tarafından kontrol edilmekte olduğu saptanmıştır. Adsorpsiyon genellikle yeraltısularındaki arseniği kontrol eden ana proses iken, yüzeyselsularda yüksek arsenik derişimlerinin bulunması herhangi bir tepkisel taşınıma uğramadığını göstermektedir.  

Keywords

• Arsenik
• Phreeqc
• Jeotermal
• Adsorbsiyon
• Redoks
• Yeraltısuyu
• Yüzeyselsu

GEOCHEMICAL BEHAVIOUR OF ARSENIC FROM GEOTHERMAL RESOURCES IN GROUNDWATER AND SURFACE WATER: COPRECIPITATION, ADSORPTION, pH-Eh

Abstract

The release of arsenic (As) from geothermal systems into surface waters and groundwaters compromises the use of these waters as drinking and irrigation water resources. In these waters, arsenic contamination can also affect aquatic ecosystems. This study examines the release of arsenic in Balçova (Izmir) and Gediz Ilıca (Kütahya) geothermal areas, its transport and speciation of As in the receiving waters, as well as the deposition and removal mechanisms occurring in the both natural environments. The systems are modeled using the Phreeqc code, taking into account aqueous speciation, dissolution/precipitation as well as , mixing with cold waters. The results of this study suggest that the partitioning is controlled by several processes including mineral precipitation, adsorption, pH and oxido-reduction. Adsorption is often the main process controlling the fate of As in the groundwater whereas in surface waters high As concentrations are due to its nonreactive behavior.

Keywords

• Arsenic
• Phreeqc
• Geothermal
• Adsorbtion
• Redox
• Groundwater
• Surface water

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