The Effects of the Use of Additives in the Removal of PAH Pollution from Industrial Soils with UVC Applications

Öz

The aim of this study is to removal of polycylic aromatic hydrocarbons (PAHs) from soil samples with ultraviolet-C (UVC) and ultraviolet-C/hydrogen peroxide (UVC-H2O2) applications. Soils were taken from an area near a cement factory in Bursa. H2O2 was added to the samples at the doses of 0%, 1%, 10% and 20% of dry soil weight and PAH removal applications were carried out during 24 hours. At the end of the removal process, the PAHs remaining in the soil were determined and the removal efficiencies were calculated. Besides, the PAHs accumulated in the indoor air by evaporating from the soil were sampled with polyurethane foam (PUF) column. The samples were extracted with ultrasonic method and PAHs were analyzed with the Gas Chromatography-Mass Spectrometry (GC-MS). Total 12 PAH (∑12 PAH) removal efficiency was increased by 9% with the use of UVC light at 30 oC. In UVC-H2O2 applications, ∑12 PAH removal efficiencies were calculated as 90%, 70%, 46% and 71% for samples containing 0%, 1%, 10% and 20% H2O2, respectively. It was concluded that H2O2 was not effective for PAH removal at 30 oC. After UVC-H2O2 applications, it was determined that 70% of evaporated PAHs consist of 3-ring PAHs and 3% consist of 4-ring PAH species.

Anahtar Kelimeler

• H2O2
• Photodegradation
• PUF
• Ring Distribution
• Soil

Endüstriyel Topraklardaki PAH Kirliliğinin UVC Uygulamalarıyla Gideriminde Katkı Maddesi Kullanımının Etkileri

Öz

Bu çalışmada, Bursa’da bir çimento fabrikası yakınından alınan toprak örneklerindeki poliaromatik hidrokarbonların (PAH’ların), ultraviyole-C (UVC) ve ultraviyole-C/hidrojen peroksit (UVC-H2O2) uygulamaları ile giderilebilirliğinin ortaya konması amaçlanmıştır. Sırasıyla toprak kuru ağırlığının %0, %1, %10 ve %20’si kadar H2O2 örneğe ilave edilmiş ve UVC ile 24 saatlik PAH giderim uygulamaları gerçekleştirilmiştir. Giderim süreci sonunda hem toprakta kalan PAH’lar belirlenerek giderim verimleri hesaplanmış hem de topraktan buharlaşarak iç ortam havasında biriken PAH’ların poliüretan köpük (PUF) kolonundan geçirilerek örneklenmesi sağlanmıştır. Ultrasonik yöntemle ekstrakte edilen örneklerde PAH ölçümleri, Gaz Kromatografisi-Kütle Spektrometresi (GC-MS) cihazıyla yapılmıştır. 30 oC’de, UVC ışığının kullanımıyla toplam 12 PAH (∑12 PAH) için giderim verimlerinde %9’luk artış tespit edilmiştir. UVC-H2O2 uygulamalarında ∑12 PAH giderim verimleri %0, %1, %10 ve %20 H2O2 içeren örnekler için sırasıyla %90, %70, %46 ve %71 olarak hesaplanmış ve H2O2’nin 30 oC’de PAH giderimi için etkin bir katkı maddesi olmadığı kanaatine varılmıştır. UVC-H2O2 uygulamaları sonrasında topraktan havaya geçen PAH’ların %70’inin 3 halkalılardan ve %3’ünün 4 halkalılardan oluştuğu tespit edilmiştir.

Anahtar Kelimeler

• Fotoparçalanma
• Halka Dağılımı
• H2O2
• PUF
• Toprak

Kaynakça

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