Atıksu arıtma çamurlarının yakılmasıyla oluşan küllerin yapı malzemesi olarak geri kazanımı
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Tarih
2020
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
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Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bursa ili kentsel atıksu arıtma tesislerinde oluşan arıtma çamurları, 2017 yılından itibaren Bursa Su ve Kanalizasyon İdaresi’ne bağlı 400 ton/gün kapasiteli bir akışkan yataklı yakma tesisinde yakılarak bertaraf edilmektedir. Yakma sürecinin sonunda her ay bertaraf edilmeyi bekleyen ortalama 615 ton kül oluşmaktadır. Bu çalışmanın amacı çamur yakma sürecinin sonunda oluşan atık çamur küllerinin yapı malzemesi olarak geri kazanılıp kazanılamayacağını araştırmaktır. Bu amaçla çamur küllerine stabilizasyon/solidifikasyon (S/S) ve jeopolimerizasyon teknolojileri uygulanmıştır. Bağlayıcı malzeme olarak Portland çimentosu, termik santral uçucu külü ve mermer çamuru kullanılmıştır. S/S örnekleri su, jeopolimer örnekleri 8MNaOH ve NaSilNaOH çözeltileriyle aktive edilmiştir. Hazırlanan pasta örnekleri 28 günlük hava kürü sonunda basınç dayanımı ve ağır metal sızma testlerine tabi tutulmuştur. Çamur külü kullanılarak hazırlanan S/S örneklerinde 21,8 MPa, jeopolimer örneklerinde ise 50,0 MPa düzeylerine ulaşan basınç dayanım değerleri elde edilmiştir. Atık çamur külü içeren bazı örneklerin basınç dayanım düzeylerinin, atık içermeyen kontrol örneklerinin basınç dayanım düzeylerinden yüksek olması dikkat çekmiştir. Sızma testi sonucunda çamur külüyle hazırlanan örneklerin tehlike sınır değerlerinin oldukça altında kaldığı görülmüştür. Gerek sızma testi gerekse basınç dayanım testi sonuçları, çamur küllerinin, yapı malzemesi olarak değerlendirilmesi gereken bir potansiyel vadettiğini göstermektedir.
Sewage sludges that are originating from the municipal wastewater treatment plants of Bursa city have been incinerated with a fluidized bed reactor of 400 tons/day capacity since 2017. Each month, on an average, 615 tons of ash is generated as a waste of the incineration process, which needs disposal. The purpose of this study was to investigate if the sludge incinerator ash can be recycled as a construction material. Stabilization/solidification (S/S) and geopolymerization technologies were applied to the sludge ash with this aim. Portland cement, fly ash from a coal-fired power plant, and marble sludge were used as binders. S/S samples were activated with water, while geopolymer samples were activated with 8MNaOH and NaSilNaOH solutions. The prepared paste samples were air-cured for 28 days and analyzed for compressive strength and heavy metals leaching. S/S samples containing sludge ash yielded a compressive strength level of 21.8 MPa, while geopolymer samples resulted in a compressive strength level of 50.0 MPa. Higher compressive strength levels of several samples containing waste sludge ash than that of the control samples without waste were noticed. Leaching tests showed that heavy metals leaching from the samples prepared with sludge ash were much lower than the legal limit values for toxicity. Both leaching tests and compressive strength tests showed that sludge ash has the potential to be considered as a construction material.
Sewage sludges that are originating from the municipal wastewater treatment plants of Bursa city have been incinerated with a fluidized bed reactor of 400 tons/day capacity since 2017. Each month, on an average, 615 tons of ash is generated as a waste of the incineration process, which needs disposal. The purpose of this study was to investigate if the sludge incinerator ash can be recycled as a construction material. Stabilization/solidification (S/S) and geopolymerization technologies were applied to the sludge ash with this aim. Portland cement, fly ash from a coal-fired power plant, and marble sludge were used as binders. S/S samples were activated with water, while geopolymer samples were activated with 8MNaOH and NaSilNaOH solutions. The prepared paste samples were air-cured for 28 days and analyzed for compressive strength and heavy metals leaching. S/S samples containing sludge ash yielded a compressive strength level of 21.8 MPa, while geopolymer samples resulted in a compressive strength level of 50.0 MPa. Higher compressive strength levels of several samples containing waste sludge ash than that of the control samples without waste were noticed. Leaching tests showed that heavy metals leaching from the samples prepared with sludge ash were much lower than the legal limit values for toxicity. Both leaching tests and compressive strength tests showed that sludge ash has the potential to be considered as a construction material.
Açıklama
Anahtar Kelimeler
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Kaynak
Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi
WoS Q Değeri
N/A
Scopus Q Değeri
Q2
Cilt
35
Sayı
3
