Sentetik biyogaz çamurunda algal biyokütle üretimi ve nütrient gideriminde sıcaklığın etkisi
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Tarih
2020
Yazarlar
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Yayıncı
Aksaray Üniversitesi Fen Bilimleri Enstitüsü
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Günümüzde yaygınlaşan anaerobik reaktörlerin çıkış suları (biyogaz çamuru) önemli oranda besi maddesi içermektedir. Biyogaz çamuru bileşiminde bulunan C, N ve P bileşikleri alıcı ortamda istenmediği durumlarda giderilmeleri gerekmektedir. Sularda azot giderimi için bilinen biyolojik yöntemlerin işletimi oldukça pahalı ve karışıktır. Enerji ihtiyacı daha az ve işletimleri daha kolay olduğu düşünülen biyolojik reaktörlerden algal reaktörlerin besi elementi gideriminde kullanımı için araştırmalar gün geçtikçe artmaktadır. Bu çalışma sentetik biyogaz çamurunda karışık kültür alg gelişimi ve nütrient giderimi üzerindeki sıcaklık etkisini araştırmak için gerçekleştirilmiştir. Çalışma laboratuvar koşullarında, üçlü paralel reaktörlerde, beyaz ışık (12 saat aydınlık / 12 saat karanlık, ışık şiddeti: 37,1 ± 5,2 µmol/m-2 .s-1 ), 15°C, 25°C ve 35°C şartlarında kesikli olarak sürdürülmüştür. Karışık kültür alglerle aşılanan kesikli reaktörlerde biyokütle üretimi devam edinceye kadar çalışmalar sürdürülmüştür. Her üç sıcaklık için biyogaz çamurunda giderilen KOİ, NH4-N ve PO4-P miktarları ve gelişen algal biyokütle değerleri oldukça yakın olmakla birlikte, 15, 25 ve 35°C’lik sıcaklıklar için inkübasyon süreleri 131 gün, 78 gün ve 38 gün olarak belirlenmiştir. Kinetik çalışmalarında KOİ, NH4-N, PO4-P azalımı ve biyokütle derişimi artış hızlarının daha çok 0. dereceye uygun olduğu tespit edilmiştir. Sıcaklığın kinetik katsayılar üzerindeki etkisi de belirlenmiştir. Sıcaklık düzeltme katsayısı (?) KOİ, NH4-N, PO4-P ve biyokütle için sırasıyla 1,065, 1,048, 1,056 ve 1,067 olarak bulunmuştur. Çalışma ortamda N ve P giderimi yanında önemli miktarda KOİ’nin de giderildiğini göstermiştir. Sonuç olarak biyogaz çamurundan karışık kültür algler ile nütrient gideriminde sıcaklığın önemli bir faktör olduğu tespit edilmiştir
The effluent of anaerobic reactors (biogas slurry), which is widespread today, contains a significant amount of nutrients. The compounds C, N and P in the biogas sludge composition should be removed because they are not desired in the receiving environment. The known biological processes for nitrogen removal in waters is very expensive and complicated. Investigations are increasing day by day for the use of algal reactors which are thought to be less energy and easier to operation. This study was conducted to investigate the effect of temperature on nutrient removal and the growth of mixed culture algae in synthetic biogas sludge. The study was carried out in triplicated parallel reactor at white light (12 hour light / 12 hour dark, light intensity: 37.1 ± 5.2 µmol/m-2 .s-1 ) and 15°C, 25°C and 35°C of temperature under laboratory conditions. Studies continued until biomass production continued in batch reactors inoculated with mixed culture algae. Although the amount of COD, NH4-N and PO4- P removal and algal biomass productivity in the biogas slurry for all three temperatures were very close, the incubation times for temperatures of 15°C, 25°C and 35°C were determined as 131 days, 78 days and 38 days. In kinetic studies, COD, NH4-N, PO4-P removal and biomass concentration increase rates were found to be more appropriate to 0th degree. The effect of temperature on kinetic coefficients was also determined. The temperature correction coefficient (?) was found to be 1.065, 1.048, 1.056 and 1.067 for COD, NH4-N, PO4-P and biomass growth, respectively. The study showed that significant COD was also removed in addition to N and P removal from biogas slurry. As a result, it was determined that temperature is an important factor in nutrient removal with mixed culture algae from biogas slurry.
The effluent of anaerobic reactors (biogas slurry), which is widespread today, contains a significant amount of nutrients. The compounds C, N and P in the biogas sludge composition should be removed because they are not desired in the receiving environment. The known biological processes for nitrogen removal in waters is very expensive and complicated. Investigations are increasing day by day for the use of algal reactors which are thought to be less energy and easier to operation. This study was conducted to investigate the effect of temperature on nutrient removal and the growth of mixed culture algae in synthetic biogas sludge. The study was carried out in triplicated parallel reactor at white light (12 hour light / 12 hour dark, light intensity: 37.1 ± 5.2 µmol/m-2 .s-1 ) and 15°C, 25°C and 35°C of temperature under laboratory conditions. Studies continued until biomass production continued in batch reactors inoculated with mixed culture algae. Although the amount of COD, NH4-N and PO4- P removal and algal biomass productivity in the biogas slurry for all three temperatures were very close, the incubation times for temperatures of 15°C, 25°C and 35°C were determined as 131 days, 78 days and 38 days. In kinetic studies, COD, NH4-N, PO4-P removal and biomass concentration increase rates were found to be more appropriate to 0th degree. The effect of temperature on kinetic coefficients was also determined. The temperature correction coefficient (?) was found to be 1.065, 1.048, 1.056 and 1.067 for COD, NH4-N, PO4-P and biomass growth, respectively. The study showed that significant COD was also removed in addition to N and P removal from biogas slurry. As a result, it was determined that temperature is an important factor in nutrient removal with mixed culture algae from biogas slurry.
Açıklama
Anahtar Kelimeler
Alg, Biyogaz Çamuru, Kinetik, Nütrient, Sıcaklık, Algae, Biogas Slurry, Kinetic, Nutrient, Temperature
