Birincil Çamur Fermentasyon Ürünlerinin Besi Maddesi Gideren Aktif Çamur Sistemlerine Etkisinin İncelenmesi
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Fen Bilimleri Enstitüsü
Institute of Science and Technology
Institute of Science and Technology
Özet
Bu çalışmada. birincil çamurun fermentasyonu (kontrollü ve kontrolsüz) ile kısa zincirli yağ asitlerinin üretimi labaratuar şartlarında ve kesikli deneyler ile incelenmiştir. Deneysel çalışmalar sabit sıcaklık (10, 15 ve 20 0C) ve oda sıcaklıklarında ve 2000-25000 mg/l arasında değişen çamur konsantrasyonlarında yürütülmüştür. Bütün çalışmalarda asidifikasyon fazının 3-6 gün sonra sona erdiği ve fermentasyon ürünleri genellikle asetik asit ve propionik asit görülmüştür. Bu türlerin miktarı karışımın %85’inden daha fazladır ve uçucu yağ asitlerinin KOİ cinsinden eşdeğeri 1.3 mg KOİ/ mg UYA’dır. Birincil çamurun kontrolsüz fermentayonunda başlangıç uçucu askıda katı maddenin %25 kadarı kolay ayrışabilir KOİ’ye dönüşmüştür ve çözülebilir KOİ’nin %85’i kısa zincirli yağ asitleri formundadır. Fermente çamurun üst fazının geri kazanılabilen kısmı, basit çöktürme çıkışındaki kolay ayrışabilir KOİ’yi %5 ve bu çıkıştaki kolay ayrışabilir KOİ oranını %30 arttırmaktadır.
In this study, experimental testing of SCVFA generation was carried out by operating batch-scale fermentors fed with primary sludge at 10, 15, 17, 20oC and room temperature. The VSS concentration in the feed was adjusted to different initial levels of between 2000-25000 mg/l to approximate the actual range in the primary settler underflow. The acidification phase in the fermentation terminated after approximately 3-6 days for all the tests. The predominant fermentation products are always acetic and propionic acid. The predominance of acetic and propionic acids constituting more than 85 % of the mixture, and the COD equivalent of VFA was calculated as 1.3 mg COD/mg VFA. Uncontrolled fermentation of the primary sludge converted 25 % of the initial volatile suspended solids in the sludge into soluble biodegradable COD. More than 85 % of the soluble COD generated was associated with the formation of short chain volatile fatty acids. The recoverable fraction of the fermented sludge supernatant was calculated to have a potential of increasing the biodegradable COD content of the primary effluent by 5% and the readily biodegradable COD fraction in this effluent by 30%.
In this study, experimental testing of SCVFA generation was carried out by operating batch-scale fermentors fed with primary sludge at 10, 15, 17, 20oC and room temperature. The VSS concentration in the feed was adjusted to different initial levels of between 2000-25000 mg/l to approximate the actual range in the primary settler underflow. The acidification phase in the fermentation terminated after approximately 3-6 days for all the tests. The predominant fermentation products are always acetic and propionic acid. The predominance of acetic and propionic acids constituting more than 85 % of the mixture, and the COD equivalent of VFA was calculated as 1.3 mg COD/mg VFA. Uncontrolled fermentation of the primary sludge converted 25 % of the initial volatile suspended solids in the sludge into soluble biodegradable COD. More than 85 % of the soluble COD generated was associated with the formation of short chain volatile fatty acids. The recoverable fraction of the fermented sludge supernatant was calculated to have a potential of increasing the biodegradable COD content of the primary effluent by 5% and the readily biodegradable COD fraction in this effluent by 30%.
Açıklama
Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2003
Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2003
Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2003
Konusu
Birincil çamur, fermentasyon, UYA, Primary sludge, fermentation, VFAs