Optimization of Struvite Precipitation for Landfill Leachate Treatment

Yıl 2018, Cilt: 23 Sayı: 1, 65 - 76, 19.04.2018

Selim Dogan , Ahmet Aygün , Mehmet Emin Argun , Ertuğrul Esmeray

https://doi.org/10.17482/uumfd.373302

Cited By: 4

Öz

Sanitary landfill is the most preferred municipal solid waste disposal method. The production of highly polluted leachate is a major disadvantage of sanitary landfills. In this study, optimization of struvite precipitation to remove ammonium from landfill leachate was conducted by using Response Surface Methodology (RSM) and Central Composite Design (CCD).  Optimum struvite precipitation conditions were determined based upon 11 runs performed in CCD. A second-order polynomial functional model was fitted well to the results. The statistical analysis showed that two independent variables which are molar rates of Mg/N and N/P had significant effects on the ammonium removal efficiency. Maximum ammonium removal efficiency was 99.8% at a molar rate of 1.20 for Mg/N and 1.27 for N/P for a constant 9.2 pH value. The obtained results revealed that struvite used as pretreatment in anaerobic process can be modelled by using RSM. And also, RSM can be used to optimize required ammonium removal efficiency for lower Mg/N and N/P molar ratio which affects the performance of pretreatment method that designed for an anaerobic process having 300:5:1 ratio for COD/N/P. 

Anahtar Kelimeler

Central Composite Design (CCD), Landfill, Leachate, MAP, Response Surface Methodology (RSM), Struvite

SIZINTI SUYU ARITIMINDA STRÜVİT ÇÖKTÜRME OPTİMİZASYONU

Öz

Evsel katı atıkların
bertarafında düzenli depolama yöntemi sıklıkla tercih edilmektedir. Çok kirli
sızıntı suyu oluşumu, düzenli depolama tesislerinin en önemli dezavantajıdır.
Bu çalışmada, Cevap Yüzey Yöntemi ve Merkezi Kompozit Tasarımı kullanılarak
sızıntı suyundan amonyum giderimine yönelik strüvit çöktürme optimizasyonu
yapılmıştır. Optimum strüvit çöktürme şartlarının belirlenmesi için 11 adet
deneysel çalışma yapılmıştır. Sonuçlar ikinci dereceden polinom fonksiyonel
model ile iyi uyum göstermiştir. İstatistiki analizler, Mg/N ve N/P molar oranı
bağımsız değişkenlerinin amonyum giderim verimi üzerine önemli etkisinin
olduğunu ortaya koymuştur. En yüksek amonyum giderim verimine %99,8 olarak; 9,2
sabit pH değerinde, Mg/N için 1,2 ve N/P için 1,27 molar oranlarında
ulaşılmıştır. Elde edilen sonuçlar, anaerobik proseste ön arıtım olarak
kullanılan strüvitin Cevap Yüzey Yöntemi kullanılarak modellenebildiğini ortaya
koymuştur. Ayrıca Cevap Yüzey Yöntemi; KOİ/N/P için 300:5:1 oranına sahip bir
anaerobik proses için tasarlanmış olan ön arıtım performansını etkileyen daha
düşük Mg/N ve N/P molar oranı için gerekli amonyum giderme verimliliğini
optimize etmek için kullanılabilir.

Anahtar Kelimeler

Merkezi Kompozit Tasarım (MKT), Düzenli depolama, Sızıntı suyu, MAP, Cevap Yüzey Yöntemi (CYY), Strüvit

Kaynakça

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