شماره ركورد كنفرانس :
5048
عنوان مقاله :
Improvement of Wastewater Treatment Section of Old Urea Plant to Satisfy New Environmental Standards
Author/Authors :
H. R ،Mottaghi Chemical Engineering Department - School of Chemical and PetroleumEngineering - Shiraz University, Shiraz, Iran , M. M ،Barmaki Chemical Engineering Department - School of Chemical and PetroleumEngineering - Shiraz University, Shiraz, Iran , A. A ،Forghani Chemical Engineering Department - School of Chemical and PetroleumEngineering - Shiraz University, Shiraz, Iran , M. R ،Rahimpour Chemical Engineering Department - School of Chemical and PetroleumEngineering - Shiraz University, Shiraz, Iran
كليدواژه :
Environmental restriction , Hydrolyser-desorber system , Model , Liquid non-ideality
عنوان كنفرانس :
ششمين كنگره بين المللي مهندسي شيمي
چكيده لاتين :
In this study, the removal of ammonia and urea from outlet wastewater of treatment section of old urea plant has been
investigated. Since the amount of urea and ammonia in outlet wastewater of treatment section of old urea plant is not
acceptable due to environmental restrictions and possible to upgrade this wastewater to reuse for boiler feed water or
cooling water, an additional thermal hydrolyser- desorber system is used for reduction of urea and ammonia. The
extended electrolytic UNIQUAC equation has been used to describe the non-ideality of liquid phase. The proposed
model incorporates reaction rate of urea hydrolysis and takes into account the effects of solution non-ideality and backmixing
on the reactor performance. The model provides concentration distribution of different components in liquid
phase along the height of reactor and in liquid and vapor phases in the desorber. Also the effects of key parameters on
the performance of wastewater treatment process have been examined. The result of this work shows that an increasing
of inlet temperature of wastewater and steam flow rate improves the urea and ammonia removal efficiency.
