RESUMEN
La ciudad de León cuenta con 500 empresas de curtiduría y 9 dedicadas al procesamiento del sebo cuyos subproductos (descarne) son desechos que se vierten al medio ambiente en grandes cantidades, ya que no representan un interés para su procesamiento y comercialización, lo que ha causado diversos problemas de contaminación en las zonas habitacionales circundantes por el vertido de aguas residuales, residuos sólidos y emisiones atmosféricas. El impacto al medio se puede considerar como adverso, directo y temporal; reversible, pero con un alto costo económico, lo que implica la necesidad de establecer medidas preventivas de control y mitigación. En el presente estudio se describen las etapas delproceso, las buenas y malas prácticas, los procedimientos estándares de operación y los impactos al medio ambiente originados por el inadecuado manejo de los residuos de las industrias sebaderas. Los resultados muestran que el 80 por ciento de las empresas procesadoras carece de sistemas de almacenamiento adecuado y no poseen sistemas de control ambiental. De igual manera, la mayoría de los operarios no cuenta con equipos de protección personal y no existe un adecuado manejo de sustancias utilizadas en los procesos, lo que incrementa el riesgo de accidentes laborales.
The city of León has 500 tannery companies and nine work in fat processing, whose by-product waste (rawhide) is dumped to the environment in tons because there is no interest in processing and commercializing this substance. This situation has caused several contamination problems in surrounding residential areas because ofthe discharge of wastewater, solid waste, and atmospheric emissions. Impact on environment can be considered as adverse, direct and temporal, as well reversible, but excessively expensive, which involvesthe need of established preventive measures of control and mitigation.The present study describes the different stages of the process, goodand bad practices, standard operational procedures, and environmentalimpacts due to the inadequate handling of waste by these companies. Results show that 80 percent of the processing companies lack appropriate storage systems and do not have an environmental control system. Additionally, most of the operators do not have personal protective equipment and there is not a proper handling of the substances used in processes; this increases the risk of work-related accidents.
Asunto(s)
Contaminación Ambiental , Riesgos Ambientales , Impactos de la Polución en la Salud , Curtiembre , Exposición Profesional , Contaminantes Orgánicos , Recolección de Datos , MéxicoRESUMEN
AIM: To study the esophageal transit time (ETT) and compare its mean value among three anatomical inclinations of the body; and to analyze the correlation of ETT to body mass index (BMI). METHODS: A biomagnetic technique was implemented to perform this study: (1) The transit time of a magnetic marker (MM) through the esophagus was measured using two fluxgate sensors placed over the chest of 14 healthy subjects; (2) the ETT was assessed in three anatomical positions (at upright, fowler, and supine positions; 90 degrees , 45 degrees and 0 degrees , respectively). RESULTS: ANOVA and Tuckey post-hoc tests demonstrated significant differences between ETT mean of the different positions. The ETT means were 5.2 +/- 1.1 s, 6.1 +/- 1.5 s, and 23.6 +/- 9.2 s for 90 degrees , 45 degrees and 0 degrees , respectively. Pearson correlation results were r = -0.716 and P < 0.001 by subjects' anatomical position, and r = -0.024 and P > 0.05 according the subject's BMI. CONCLUSION: We demonstrated that using this biomagnetic technique, it is possible to measure the ETT and the effects of the anatomical position on the ETT.
