DBPapers
DOI: 10.5593/SGEM2016/B31/S12.027

CONTINUOUS STIRRED TANK REACTOR MODEL VERSUS PLUG FLOW REACTOR MODEL FOR A RIVER POLLUTION STUDY

G. Dumitran, L. Vuta, V. Piraianu, C. Dragoi
Wednesday 7 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-61-2 / ISSN 1314-2704, June 28 - July 6, 2016, Book3 Vol. 1, 203-210 pp

ABSTRACT
The purpose of this study is to compare the capabilities of continuous stirred tank reactor model (CSRT) and plug flow reactor model (PFR) to simulate a pollution episode over a river sector. For a given river sector, the steady-state regime is assumed and an upstream pollution of 10 mg/l concentration (C0) is considered. The pollution of the river segment is simulated in terms of a detailed chemical kinetics model for the two ideal reactors considered.
Two types of pollutants are investigated: the first one characterized by a reaction coefficient of 21.6 (1/day) and the second one by a reaction coefficient of 9.85 (1/day). The values of the concentration downstream the discharge point are computed using the above mentioned models and compared, in order to identify which one is more adequate for a specific river pollution problem.
The downstream values of the concentration have been determined using a 10, 20 and 50 CSTR in series, and a PFR with a space step of 1m. In order to analyze the accuracy of the CSTR system, the mean square errors (RMSE) have been computed.
In conclusion, CSTR models can be considered a good solution to be used in modelling river pollution only if the river sector is very well meshed.

Keywords: river pollution, continuous stirred tank reactor model, plug flow reactor model