In Anaerobic Treatment of Cheese Whey Modelling of Lactose Conversion in Pre-treatment Tank

Year 2017, Volume: 2 Issue: 1(3) - Volume 2, Issue 1(3), 212 - 217, 01.06.2017

Hatice Aktosun Saffettin Ferda Mutlu

Abstract

The high lactose content of cheese whey adversly
affects the activities of the methane archaea due to the rapid pH drop during
directly treatment in the UASB reactor and cheese whey pH must be controlled
first in pre-treatment tank and it would be fed to the UASB reactor at stable
pH. In this study, the effects of temperature, pH and dilution ratios on
lactose conversion were modeled in the pretreatment tank depending on the data
obtained in the experimental conditions determined by the statistical
experimental design method. In this
study, lactose conversions determined by measuring lactose concentrations with
DNS method at the conditions determined by the Box-Wilson experimental design
method, and they were studied in 20 reactors. The obtained data was evaluated
by Design Expert 7.0.0 Trial "package program. Using the obtained data in
the "Design Expert 7.0.0 Trial" package program, the following model
equation was obtained in the pre-treatment tank:

 Y₁ = 44,70 + 14,11*X₁ +
1,35*X₂ +2,85*X₃ – 0,29*X₁*X₂ +
0,80*X₁X₃ – 0,13*X₂X₃  + 6,81*X₁² +
3,24*X₂² + 1,75*X₃²

(Y₁ =
% Lactose Conversion, X₁ = Temperature, X₂ = pH, X₃
= Dilution Ratio)

 In the pretreatment reactor, a model equation that
gives the changes of the lactose conversion with temperature, pH and dilution
ratio was developed and controlled feed conditions for the UASB reactor were
determined.

Key words: Cheese whey, lactose
conversion, pre-treatment reactor, UASB reactor, model equation.

Keywords

In Anaerobic Treatment of Cheese Whey Modelling of Lactose Conversion in Pre-treatment Tank

References

• Hatice Aktosun1, Saffettin Ferda Mutlu2 1 İl Afet ve Acil Durum Müdürlüğü, Ankara, Turkey. 2Gazi Üniversitesi, Mühendislik Fakültesi, Kimya Mühendisliği Bölümü, Ankara, Turkey.