Wet Oxidation of Dairy Sewage: The Kinetic Study of Decomposition of the Milk Components

• Authors: Klara Piotrowska , Mirosław Imbierowicz , Andrzej Chacuk
• Languages of publication: EN

Abstracts

EN

The article presents the results of kinetic studies of the wet oxidation process of dairy sewage. The dairy sewage, obtained straight from the production line, was subjected to oxidation at pH close to the natural value of 7. Experiments were carried out in a stirred batch tank reactor at the oxygen partial pressure equal to 1 MPa and at temperature ranging from 473 to 593 K. The effectiveness of organic compounds decomposition was estimated based on the measurement of TOC. The kinetics of decomposition of milk components, ie lactose, protein and fat, as well as the kinetics of oxidation of intermediate products was the aim of the study. Measurement of the concentration of protein, fat and lactose was done with a milk composition analyzer, calibrated in relation to the dairy sewage. The obtained results were used to develop a mathematical model of wet oxidation of dairy sewage, including the group of analyzed compounds.

PL

Artykuł prezentuje wyniki badań kinetycznych procesu mokrego utleniania ścieków pochodzących z przemysłu mleczarskiego. Utlenianiu poddane zostały ścieki mleczarskie o ich naturalnym pH zbliżonym do wartości 7, pobrane bezpośrednio po procesie produkcyjnym. Badania prowadzone były w okresowym reaktorze zbiornikowym z mieszadłem, przy ciśnieniu cząstkowym tlenu wynoszącym 1 MPa, w zakresie zmienności temperatury od 473 do 593 K. Oceny efektywności stopnia rozkładu związków organicznych dokonano na podstawie pomiaru wartości TOC. Celem badań było zbadanie kinetyki rozkładu związków wchodzących w skład mleka - laktozy, białek i tłuszczu oraz kinetyki przemian produktów pośrednich utleniania - lotnych kwasów tłuszczowych. Pomiar stężenia białek, tłuszczu i laktozy odbywał się z wykorzystaniem analizatora składu mleka, skalibrowanego w stosunku do ścieków mleczarskich. Otrzymane wyniki posłużyły do budowy modelu matematycznego procesu mokrego utleniania ścieków, obejmującego grupy analizowanych związków.

Keywords

EN

wet oxidation; dairy sewage; kinetic model

PL

mokre utlenianie; ścieki mleczarskie; model kinetyczny

• Publisher: De Gruyter Open
• Journal: Ecological Chemistry and Engineering S
• Year: 2013
• Volume: 20
• Issue: 3
• Pages: 531-541

Dates

published

1 - 09 - 2013

online

08 - 10 - 2013

Contributors

author

Klara Piotrowska

• Faculty of Process and Environmental Engineering, Lodz University of Technology, ul. Wólczańska 213, 90-924 Łódź, Poland

author

Mirosław Imbierowicz

• Faculty of Process and Environmental Engineering, Lodz University of Technology, ul. Wólczańska 213, 90-924 Łódź, Poland

author

Andrzej Chacuk

• Faculty of Process and Environmental Engineering, Lodz University of Technology, ul. Wólczańska 213, 90-924 Łódź, Poland

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Identifiers

DOI

10.2478/eces-2013-0040