Exposición Al Material Particulado En Las Áreas De Preparación De Material Abrasivo De Una Empresa En El Parque Industrial De Riobamba

In this research, a study of the determinants of risk and exposure on a particular matter was done in preparation for the areas of abrasive material. Qualification of chemical risks (inorganic powder) using the matrix triple irrigation was performed. In addition, the dust concentration in each position was evaluated using the rules NIOSH 0500 (total dust) and NIOSH 0600 (respirable dust) by statistical criteria NIOSH. Thus, their results are based on the gravimetric method. A sanitary survey to determine the relationship between the study variables with the powder was also performed. After examining the sampling points, 5 points was obtained with overexposure. As a result, a letter of commitment was made with corrective actions. It also re-monitors those exposed points overexposure resulting in a point (primary crusher). However, this works one to two times per month for 4 hours. As a result, no longer exposure would make production workers rotate jobs. Additional corrective actions, to further reduce exposure to dust extractor main advantage powders, were proposed. This, however, results in the generation of optimal environment for workers.

Industrial Conditions of the Granular Material Manufacturing Process

The article presents industrial conditions of manufacturing multi-component heterogeneous mixtures of granular materials. The study analyzed the production technology and devices used for production such as storage siloes, an impact screen, a cyclone separator, a shaving and dust extractor, a screw mixer, a tensometric weigh, a bucket conveyor. A division and the successive stages of manufacturing process has been presented: unloading, receipt and storage of raw materials, quality control of components, technology cleaning and sorting of raw materials, dosage and mixing of feed material, bagging, storage, extraction processes and evaluation of homogeneity in a fodder mixing plant. Moreover the methods of assessing the homogeneity of the multi-component heterogeneous mixtures has been presented. The research was conducted in industrial conditions.

Gaseous and Solid Air Pollutants Formed during the Combustion of Heavy Metal Contaminated Oak and Poplar

In recent decades several industrial activities polluted the soil, which caused the accumulation of heavy metals to an extent greater than the natural concentration. This is mainly typical of countries, where mining and industry plays or has played an important role in the economy. The utilization of these lands is an economic interest, since locating the contamination, controlling its spreading and maintaining the area has costs. One of the methods for remediation is phytoextraction, during which heavy metals, especially harmful to water and soil, are removed from the soil by plants capable of accumulating contaminants. However, during the combustion of these plants their heavy metal content is replaced into the formed gaseous and solid combustion remains, so the hazard, composition and treating method of these remains must be defined by the appropriate examinations. In this article we present some part of the results of this research, where we examine the gaseous and solid pollutant content of flue gas formed during combustion, as well as the heavy metal content of fly ash. We made two different experiments for domestic and semiplant usage. We have used oak and poplar from a heavy metal contaminated area in both experiments. The domestic examination was conducted in a 7 kW hearth with a closed combustion chamber, the semiplant examination was carried out in a 0,5 MW capacity furnace equipped with an automatic fuel feeding system and a cyclone dust extractor. We have measured the composition of flue gas in both firing experiments with a HORIBA PG-250 type portable gas analyzer, in the case of the analysis of heavy metal content of fly ash DX4 EDAX EDS microprobe of an AMRAY 1830 I scanning electron microscope and ICP-AES, using a 720 ES instrument was used. Based on our results, it can be determined, that the combustion device used to burn biomass grown on heavy metal polluted areas – brownfield lands – must make it possible to separate fly ash from the flue gas and allow the handling of solid burning residues.

Study on the Method for Cleaning the Filter Bags Used in Baghouse

In this paper, we have reported a method for cleaning the filter bags used in the baghouse. Three filter bag samples were cleaned by compressed air with the pressure of 0.6MPa, a dust extractor, and then washed with three kinds of detergents. After washing, the filter bag samples show good permeability, and the concentration of corrosive ions on the surface are much lower. “A” is the most effective detergent for this filter bag.

Effects of Particle Sizes, Resin Content and Board Densities on the Properties of Phenol Formaldehyde Particleboard from Oil Palm Trunk Particles

Twentyfive year old oil palm trunk supplied by MPOB, Bangi, Selangor, was converted into strands using a disk flaker and into particles using a dust extractor. Particleboard was produced using phenolic resin at 7, 9 and 11 % compositions based on particle weight used Particle size variedfrom 1.0-2.0 mm and the board density varied from 500-700 kg m'. No significant improvement in MaR, MOE and IB was observed when the particle size was increased from 1.0 to 2.0 mm. However, with larger particle size the water absorption and thickness swelling properties improved. Increasing the resin content from 7-11 % significantly increases the mechanical properties and improves the water absorption and thickness swelling properties. Increasing the board density results in an increase in MaR, MOE and1Banda significant increase in the water absorption and thickness swelling properties. Particleboard with a high board density and resin content ofmore than 9 % met the minimum British Standard requirements.

Effects of Particle Sizes, Resin Content and Board Densities on the Properties of Phenol Formaldehyde Particleboard from Oil Palm Trunk Particles

Twenty five year old oil palm trunk supplied by MPOB, Bangi, Selangor, was converted into strands using a disk flaker and into particles using a dust extractor. Particleboard was produced using phenolic resin at 7, 9 and 11 % compositions based on particle weight used Particle size varied from 1.0-2.0 mm and the board density varied from 500-700 kg m-3. No significant improvement in MOR, MOE and IB was observed when the particle size was increased from 1.0 to 2.0 mm. However, with larger particle size the water absorption and thickness swelling properties improved. Increasing the resin content from 7-11 % significantly increases the mechanical properties and improves the water absorption and thickness swelling properties. Increasing the board density results in an increase in MOR, MOE and IB and a significant increase in the water absorption and thickness swelling properties. Particleboard with a high board density and resin content of more than 9 %met the minimum British Standard requirements.

Temporal and Spatial Dispersal of Cladobotryum Conidia in the Controlled Environment of a Mushroom Growing Room

ABSTRACT Cladobotryum spp. are responsible for cobweb disease of mushrooms. In two commercial and one experimental mushroom-growing room, Cladobotryum conidia were released into the air in direct response to physical disturbance of disease colonies during either crop watering or treatment by covering with salt to 10 mm. Conidia were detected using a Burkard spore trap or agar-based trap plates. A maximum concentration of ∼25,000 conidia m−3 was recorded in a small (75-m3) experimental growing room in the hour following the salting of 16 cobweb patches (0.55 m2). Concentrations of 100 and 40 conidia m−3 were recorded in the two larger commercial growing rooms in the hour following the salting of 18 and 11 patches of cobweb (diameter, approximately 50 to 200 mm), respectively. In controlled experiments, disturbed conidia were dispersed rapidly throughout a small growing room, with 91 to 97% of conidia settling out within 15 min. Eighty-five percent of conidia settled out within a 0.5-m radius when air-conditioning fans were switched off, consistent with airborne spore dispersal. Alternative methods for treating diseased areas to minimize conidial release and distribution were investigated and included covering disease colonies with damp paper tissue prior to salt application (tissue salting) and holding a dust extractor above disease colonies during salt application. Both methods resulted in no detectable airborne conidia, but the tissue paper salting technique was more convenient. Prevention of airborne conidial release and distribution is essential to avoid mushroom spotting symptoms, secondary colonies, and early crop termination.