Piroliz gazından karışık kültür kullanılarak sentezgaz fermentasyonu ile biyoetanol üretimi: Isıl ön işlem etkisi

Yıl 2020, Cilt: 26 Sayı: 7, 1299 - 1307, 07.12.2020

Tuğba Keskin Gözde Duman

Öz

Son yıllarda hava kirliliğinin insan sağlığını ciddi boyutlarda etkileyecek düzeylere gelmesi ve yenilebilir enerji kaynaklarına olan gereksinimin artmasına sentezgazdan biyoetanol üretimi ortak bir çözüm sunmaktadır. Sentezgaz hava kirliliği oluşturan CO, CO2, N2, H2, NOx gibi gazların bileşiminden oluşur ve bazı Clostiridium türlerinin bu gazları metabolize ederek biyoetanol üretiminde kullanılabilir. Biyoetanol, benzinle karıştırılarak doğrudan kullanılabilmesi avantajından dolayı yenilenebilir enerji kaynakları arasında oldukça önemli bir biyoyakıttır. Biyoetanol üretiminde atık ve lignoselülozik hammaddelerin kullanılmasında uygulanan pahalı ön işlem yöntemlerine göre piroliz işlemi önemli bir alternatiftir. Bu çalışma kapsamında kullanılan biyoetanol üretiminde piroliz işlemi ile lignoselülozik atıkların biyokömüre dönüştürülmesi ve yan ürün olan atık gazın toplanarak biyoetanol üretiminde kullanılması iki faklı enerji kaynağının aynı sistemle üretilmesi açısından yenilikçi ve enerji verimli bir yaklaşımdır. Saf Clostiridium türleri ile piroliz gazından etanol üretiminde karışık kültür kullanılması da maliyetlerin düşürülmesi açısından oldukça önemlidir. Bu çalışma kapsamında biyokömür eldesi amacıyla meyve sebze atıklarının pirolizi sırasında açığa çıkan atık gazdan ısıl ön işlem uygulanmış karışık kültür kullanılarak biyoetanol üretimi gerçekleştirilmiştir. Karışık kültürde ısıl ön işlemin olumlu etkisi gözlenirken reaktörlere beslenecek piroliz gazı miktarı optimize edilmiş, en yüksek etanol üretimi 5 g/l olarak 5 ve 10 mL piroliz gazı beslemesinde gözlenmiştir.

Anahtar Kelimeler

Biyokömür, Piroliz, Sentezgaz fermentasyonu, Biyoetanol, Anaerobik karışık kültür, Isıl ön işlem

Kaynakça

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