The production process of nitroaromatic hazardous compounds, with the generation of acidic wastewater, represents a significant danger for the health and safety of the workers and the environment. The present study is focused on the development of an efficient installation to treat acidic wastewater resulting from the synthesis process of nitroaromatic compound, considering workers safety and environmental criteria. In this research, a detailed study of the different alternatives that can be used for effective and safe treatment of acidic wastewater was performed. The analysis of several technological schemes for the acidic wastewaters neutralization and the selection of the most feasible alternative from a technical-economic point of view were carried out. The simulation and mathematical modeling developed in this research represent a significant advance in the knowledge of this process for working in a much more secure form. The technological scheme of the process was defined, and the design of the main and auxiliary equipment as well as the piping system was carried out using different computational programs. Finally, this paper proposes a technological design for the treatment of acidic wastewater generated by the production process of nitroaromatic compound, which represents the basic criteria for the further design, construction, and equipment installation of the plant. 1. Introduction In Cuba, the environmental problems represent one of the major concerns since 1981 when the law of environmental protection and rational use of natural resources was approved. Several studies to improve the treatment of hazardous wastes generated from explosive production industry have been conducted. The production process of nitroaromatic hazardous compounds, with the generation of acidic wastewater, represents a significant danger for the health and safety of the workers and the environment. This wastewater containing solid particles of the nitroaromatic compounds and nitric acid in a concentration range between 58 and 62% constitutes a potential risk to the environment. The present study is focused on to develop an efficient installation to treat acidic wastewater resulting from the synthesis process of nitroaromatic compound, considering workers safety and environmental criteria. 2. Materials and Methods In this research, a detailed study of the different alternatives that can be used for effective and safe treatment of acidic wastewater was performed. The analysis of several technological schemes for the acidic wastewaters neutralization and the selection of
References
[1]
M. Cruz and B. Guerra, Análisis de alternativas de tratamiento de los residuales líquidos y gaseosos de la planta de síntesis del “producto P” [Tesis de Maestría en Ciencias], Universidad Central de Las Villas, Santa Clara, Cuba, 2002.
[2]
J. Pérez, “Plantas fabricadoras de ácidos,” Residuos industriales, 2005, http://www.textoscientificos.com/.
[3]
G. Collins, Fertilizantes comerciales, sus fuentes y usos, Editorial Revolucionaria, Ciudad de La Habana, 1986.
[4]
J. Sánchez, “Fertirrigación. Principios, Factores, Aplicaciones,” in Seminario de Fertirrigación: Apukai-Comex Perú Lima, 2000, http://ebookbrowse.com/fertirrigacion-pdf-d75755877.
[5]
V. Lipinski and B. A. Fertirriego, Departamento de Ingeniería Agrícola, Cátedra de Química Agrícola, Facultad de Ciencias Agrarias, Universidad Nacional de Cuyo, Almirante Brown 500 (5505), Chacras de Coria, Mendoza, Argentina, 2008.
[6]
Matches, Conceptual process and cost engineering services to the chemical, energy, manufacturing and metallurgical industries, 2012, http://www.matche.com/.
[7]
V. J. Rosabal and M. M. Valle, Hidrodinámica y Separaciones mecánicas, Ediciones ENPES, La Habana, Cuba, 1989.
[8]
L. M. Ríos and E. Ca？izares, Dise？o de un sistema para el tratamiento de los residuales ácidos de la planta de síntesis del “producto P” [Tesis de Maestría en Ciencias], Universidad Central de Las Villas, Santa Clara, Cuba, 2007.
[9]
L. M. Hidalgo, R. Santos, B. Guerra, L. M. Peralta, and G. Esperanza, “Implementation of the dynamic modelling for development of chemical processes,” Chemical Engineering Transactions, vol. 21, pp. 1009–1014, 2010.
[10]
K. Shimizu, S. Takada, K. Minekawa, and Y. Kawase, “Phenomenological model for bubble column reactors: prediction of gas hold-ups and volumetric mass transfer coefficients,” Chemical Engineering Journal, vol. 78, no. 1, pp. 21–28, 2000.
[11]
X. Gang and L. Xi, “An axial dispersion model for evaporating bubble column reactor,” Chinese Journal of Chemical Engineering, vol. 12, no. 2, pp. 214–220, 2004.
[12]
S. S. Alves, C. I. Maia, and J. M. T. Vasconcelos, “Gas-liquid mass transfer coefficient in stirred tanks interpreted through bubble contamination kinetics,” Chemical Engineering and Processing, vol. 43, no. 7, pp. 823–830, 2004.
[13]
V. Linek, T. Moucha, and J. Sinkule, “Gas-liquid mass transfer in vessels stirred with multiple impellers. I: gas-liquid mass transfer characteristics in individual stages,” Chemical Engineering Science, vol. 51, no. 12, pp. 3203–3212, 1996.
[14]
O. Lahav, T. Mor, A. J. Heber et al., “A new approach for minimizing ammonia emissions from poultry houses,” Water, Air, and Soil Pollution, vol. 191, no. 1–4, pp. 183–197, 2008.
[15]
Chemical Engineering Journal, Chemical Engineering Journal vol. 119, no. 5, 2012. TM & EPI Engineering, http://en.okezine.com/chemical-engineering-magazine-june-2012/.
[16]
G. D. Ulrich and P. T. Vasudevan, Chemical Engineering Process Design and Economics: A Practical Guide, 2nd edition, 2004.
