Hastane Atıksularının Membran Biyoreaktör’de (MBR) Farklı İşletme Koşullarında Arıtımının Yaşam Döngüsü Etki Analizi ile Karşılaştırılması

Öz

Bu çalışmada, tam aerobik ve düşük oksijen konsantrasyonlarında eş zamanlı nitrifikasyon-denitrifikasyon (SND) koşullarında, hastane atıksularını arıtan MBR sisteminin çevresel etkileri Yaşam Döngüsü Etki Analizi (YDEA) ile araştırılmıştır. Çalışma sonucunda, her iki koşulda da en yüksek çevresel etki tuzlusu ötrofikasyonunda gerçekleşmiştir. Tam aerobik koşullardan SND şartlarına geçildiğinde tatlısu ve tuzlusu ötrofikasyonu için çevresel etkide sırasıyla %30 ve %31 azalma tespit edilmiştir. Enerji tüketiminde %25 azalma gözlenirken, SND şartlarında reaktörden kaynaklanan hava emisyonlarından dolayı küresel ısınma etkisinde %13 artış olabileceği tespit edilmiştir. Tüm etki kategorileri birlikte değerlendirildiğinde, tam aerobik koşullardan SND şartlarına geçişte çevresel etkilerde %30 azalma olacağı tahmin edilmiştir.

Anahtar Kelimeler

• Eş zamanlı nitrifikasyon-denitrifikasyon
• hastane atıksuyu
• membran biyoreaktör
• ötrofikasyon
• yaşam döngüsü etki analizi

Comparison of Treatment of Hospital Wastewater in Membrane Bioreactor (MBR) under Different Operating Conditions by Life Cycle Impact Analysis

Öz

In this study, environmental impacts of the MBR system, which treats hospital wastewater under conditions of full aerobic and simultaneous nitrification-denitrification (SND) at low dissolved oxygen concentrations were investigated by Life Cycle Impact Analysis (LCIA). Our results showed that the highest environmental impact was determined in marine eutrophication in both conditions. The reduction of environmental impacts for freshwater eutrophication and marine eutrophication were calculated at %30 and %31, respectively when the condition changed from fully aerobic to SND. Furthermore, it was determined that a 25% decrease was observed in energy consumption while a 13% increase in the global warming effect was due to air emissions from the SND conditions. When all impact categories are considered together, it is estimated that there will be a 30% reduction in environmental impacts in the transition from fully aerobic condition to SND.

Anahtar Kelimeler

• Simultaneous nitrification-denitrification
• Hospital wastewater
• Membrane bioreactor
• Eutrophication
• Lifecycle impact analysis

Kaynakça

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