Süt Endüstrisi Atıksularının Kimyasal Arıtımının Yanıt Yüzey Yöntemi ile Optimizasyonu

Bu çalışmada, yüksek kirletici yükleri ile karakterize edilen süt endüstrisi atıksularının kimyasal arıtımı amaçlanmıştır. Arıtımda koagülant olarak demir III klorür (FeCl3.6H2O) ve alüminyum sülfat (Al2(SO4)3.18H2O) kullanılmış, her iki koagülant için optimizasyon metodu olarak yanıt yüzey yönteminin (YYY) merkezi kompozit tasarımı (MKT) uygulanarak atıksudan kimyasal oksijen ihtiyacı (KOİ) ve askıda katı madde (AKM) giderimleri incelenmiştir. Yöntem yardımıyla KOİ ve AKM giderim verimlerinin hesaplanabileceği denklemler elde edilmiş, arıtma prosesini etkileyen en önemli parametreler ortaya konularak giderimleri maksimum yapan şartlar belirlenmiştir. Demir III klorür ile yapılan çalışmalarda KOİ ve AKM giderim verimlerini maksimum yapan şartlar; pH: 7.41, doz: 158.579 mg L-1 elde edilmiş ve bu şartlarda KOİ ve AKM giderim verimleri sırasıyla %80.84 ve %98.10 olmuştur. Alüminyum sülfat (alüm) ile yapılan çalışmalarda KOİ ve AKM giderim verimlerini maksimum yapan şartlar; pH: 7.29, doz: 197.475 mg L-1 elde edilmiş ve bu şartlarda KOİ ve AKM giderim verimleri ise sırasıyla %73.33 ve %96.21 olmuştur.

Anahtar Kelimeler:

Süt endüstrisi atıksuları, yanıt yüzey yöntemi, koagülasyon

Optimization of Chemical Treatment of Dairy Industry Wastewater by Response Surface Methodology

In this study, the chemical treatment of dairy industry wastewater characterized by high pollutant load is aimed. In the treatment, iron III chloride (FeCl3.6H2O) and aluminum sulphate (Al2(SO4)3.18H2O) were used as coagulants. Chemical oxygen demand (COD) and suspended solids (SS) removal were analyzed by applying the central composite design (CCD) optimization method of response surface methodology (RSM) for both coagulants. Emprical equations giving the COD and SS removal efficiency were derived by RSM. The most important parameters affecting the treatment process and the conditions maximizing the COD and SS removal were determined by the equations. As a result, the conditions that maximize the COD and SS removal efficiency of iron III chloride were obtained as pH: 7.41, dose: 158.579 mg L-1 and COD and SS removal efficiency of iron III chloride at these conditions were 80.84% and 98.10%, respectively. Also, the conditions maximizing the COD and SS removal efficiency of aluminum sulphate (alum) were obtained as pH: 7.29, dose: 197.475 mg L-1 and COD and SS removal efficiency of alum at these conditions were obtained as 73.33% and 96.21%, respectively.

Keywords:

Dairy industry wastewater, response surface methodology, coagulation,

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