Publication: Microcystis sp. ile demir, bakır ve çinko metallerinin giderimi
Abstract
Microcystis sp. İLE DEMİR, BAKIR VE ÇİNKO METALLERİNİN GİDERİMİ Günümüzde su ekosistemleri endüstriyel, tarımsal ve evsel faaliyetler sonucu hızla kirlenmektedir. Su ekosistemlerindeki en önemli kirlilik çeşitlerinden biri de metal kirliliğidir. Metaller akuatik canlılar üzerinde toksik etkilere sebep olur. Bu problemin en önemli nedeni toksinlerin doğal fizyolojik yollarla vücuttan dışarı atılamaması ve karaciğerde birikmesidir. Küçükçekmece Gölü de metal kirliliğine maruz kalan ekosistemlerden biridir. Ayrıca gölde tarımsal faaliyetler neticesinde nütriyent kirliliği de görülmektedir. Nütrient kirliliğinin sonucunda gölde periyodik olarak ötröfikasyon meydana gelmektedir. Microcystis sp. ötröfikasyon süresince ortaya çıkan baskın cinslerden biri olarak tespit edilmiştir. Bu çalışmada göl ekosisteminde diğer metallere göre daha fazla miktarda bulunan demir, bakır ve çinko metalleri adsorbat olarak, Microcystis sp.’de adsorbent olarak seçilmiştir. Deneyler kesikli reaktörlerde sentetik metal çözeltilerinden 0.1 ml örnek alımıyla 72 saat boyunca periyodik olarak yürütülmüştür. pH’ın ve metal konsantrasyonunun adsorpsiyona etkisinin incelenebilmesi için üç farklı pH değeri (6,5. 7,5. 8,5) ve değişik metal konsantrasyonlarında (1 – 18 ppm) çalışılmıştır.
ADSORPTION OF IRON, COPPER AND ZINC WITH Microcystis sp. In the last decade, pollution in aquatic environments as a result of industrial, agricultural and domestic activities has increased. One of the most important pollution types in aquatic ecosystems is metal pollution which causes toxic effects in aquatic species. The most dangerous aspect of this problem is that these toxins cannot be discarded out of the body in physiological ways, metals consequently accumulate in the liver. Küçükçekmece Lake is a typical example of such an ecosystem which is being destroyed progressively as a result of metal pollution. Moreover the Lake is affected by nutrient load from antrophogenic activity. As a result of nutrient pollution eutrofication occurs periodically in the Lake. Microcystis sp. has been identified as one of the major species during the eutrofication period. In this study iron, copper and zinc that are found more widely than other metals in the Lake’s ecosystem, are chosen as adsorbate and Microcystis sp. is chosen as adsorbent. Experiments have been performed with synthetic metal solutions in batch reactors. Samples of 0.1 ml have been taken periodically from the solution during 72 hour-experimental period. To observe the effects of pH and metal concentration on adsorption, experiments have been performed at three different pH values of 6.5, 7.5, 8.5 with different metal concentrations between 1 and 18 ppm. Experimental results show that the adsorption of the metals by Microcystis sp. is a function of pH. Copper and zinc in a solution at pH 6.5, iron in a solution at pH 8.5 fit the Freundlich isotherm. Zinc in a solution at pH 8.5 and iron in a solution at pH 6.5 fit the Langmuir isotherm. Adsorption of copper in a solution at pH 6.5, 8.5, of zinc in a solution at pH 7.5 and of iron in a solution at pH 7.5 cannot be correlated with any isotherm. In conclusion, it is considered that Microcystis sp. is an appropriate adsorbent for iron, zinc and copper depending on the pH of the solution.
ADSORPTION OF IRON, COPPER AND ZINC WITH Microcystis sp. In the last decade, pollution in aquatic environments as a result of industrial, agricultural and domestic activities has increased. One of the most important pollution types in aquatic ecosystems is metal pollution which causes toxic effects in aquatic species. The most dangerous aspect of this problem is that these toxins cannot be discarded out of the body in physiological ways, metals consequently accumulate in the liver. Küçükçekmece Lake is a typical example of such an ecosystem which is being destroyed progressively as a result of metal pollution. Moreover the Lake is affected by nutrient load from antrophogenic activity. As a result of nutrient pollution eutrofication occurs periodically in the Lake. Microcystis sp. has been identified as one of the major species during the eutrofication period. In this study iron, copper and zinc that are found more widely than other metals in the Lake’s ecosystem, are chosen as adsorbate and Microcystis sp. is chosen as adsorbent. Experiments have been performed with synthetic metal solutions in batch reactors. Samples of 0.1 ml have been taken periodically from the solution during 72 hour-experimental period. To observe the effects of pH and metal concentration on adsorption, experiments have been performed at three different pH values of 6.5, 7.5, 8.5 with different metal concentrations between 1 and 18 ppm. Experimental results show that the adsorption of the metals by Microcystis sp. is a function of pH. Copper and zinc in a solution at pH 6.5, iron in a solution at pH 8.5 fit the Freundlich isotherm. Zinc in a solution at pH 8.5 and iron in a solution at pH 6.5 fit the Langmuir isotherm. Adsorption of copper in a solution at pH 6.5, 8.5, of zinc in a solution at pH 7.5 and of iron in a solution at pH 7.5 cannot be correlated with any isotherm. In conclusion, it is considered that Microcystis sp. is an appropriate adsorbent for iron, zinc and copper depending on the pH of the solution.