Fitoremediasyon ve piroliz işlemlerinin ardışık uygulamasıyla kadmiyum stabilizasyonu

Yıl 2016, Cilt: 22 Sayı: 6, 497 - 502, 20.12.2016

Aysun Özkan Müfide Banar Zerrin Günkaya Alev Kulaç Gülser Yalçın Kadriye Taşpınar Abdullah Altay

Öz

Bu
çalışmanın amacı, toprakta kirletici olarak bulunan kadmiyumun (Cd)
stabilizasyonunu sağlamak için,  ardışık
olarak fitoremediasyon ve piroliz işlemlerinin uygulanmasıdır. Çalışmanın ilk
aşamasında, kadmiyumla kirlenmiş topraklara farklı bitkilerle (ayçiçeği, mısır
ve kanola) ve farklı EDTA derişimleriyle (0-5-10 mmol/kg) fitoremediasyon
uygulanmıştır. Fitoremediasyon çalışmaları sonucunda, %89.6-93.5 aralığında
giderim verimleri elde edilmiştir. Hasat işleminden sonra kadmiyumla kirlenmiş
bitkiler, 240 cm³’lük paslanmaz çelik (380 S) sabit yatak bir
reaktörde 500 °C sıcaklık ve

35 °C/dk ısıtma hızında piroliz edilmiştir. Pirolizden sonra, katı ve sıvı
ürünlerin metal içeriği ve özellikleri belirlenmiş ve ayrıca katı üründe eluat
analizleri yapılmıştır. Piroliz sonucunda kirlenmiş bitkilerdeki kadmiyumun
katı üründe stabilize edildiği belirlenmiştir.

Anahtar Kelimeler

Fitoremediasyon, Kadmiyum, Piroliz, Tehlikeli atık, Toprak kirliliği

Cadmium stabilization via sequential application of phytoremediation and pyrolysis

Öz

The
objective of this study is the treatment of cadmium (Cd) contaminated soil and
stabilization of cadmium (Cd) in a solid product. For this aim,
phytoremediation and pyrolysis were sequentially applied. Phytoremediation was
first applied to cadmium contaminated soil via different plants (sunflower,
corn and rape). After harvesting, contaminated plants were pyrolyzed.
Phytoremediation was realized with different chelate (EDTA) concentrations
(0-5-10 mmol/kg). The phytoremediation results indicated that high
phytoremediation efficiencies (89.6-93.5%) were observed. Then, contaminated
plants were pyrolyzed at 500°C with the heating rate of 35 °C/min in a fixed
bed 240 m³ stainless steel reactor (380 S). Beside the main property
analyses, Cd content and eluate analysis were performed on the pyrolysis solid
and liquid products. According to pyrolysis results, Cd content of the
contaminated biomass species is fixed into the ash/char fraction.

Anahtar Kelimeler

Cadmium, Hazardous waste, Phytoremediation, Pyrolysis, Soil pollution

Kaynakça

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