Abstract
In this work, noise level in five selected processing and manufacturing industries in Ilorin are evaluated and compared. Emphasis is given to noise emitted by individual industrial machinery from the selected industries. Event L Aeq and L N cycles were studied to identify the noisy machines and to generate baseline data. Findings show that hammer mill machine from mineral-bearing rock-crushing mills produced the highest average noise [98.4 dB(A)], an electric generator 1 [95.6 dB(A)] from the soft drink bottling industry, an electric generator [97.7 dB(A)] from the beer brewing and bottling industry, a vacuum pump [93.1 dB(A)] from the tobacco making industry, and an electric generator 2 [94.1 dB(A)] from the mattress-making industry. The highest and lowest average noise exposure levels are recorded in mineral-bearing rock-crushing mills [93.16 dB(A)] and the mattress making industry [84.69 dB(A)], respectively. The study shows that, at 95% confidence level, there is significant difference (P < 0.05) in noise levels in the industries surveyed. The percentages of machines that emit noise above Federal Environmental Protection Agency and Occupational Safety and Health Administration recommendations [90 dB(A)] are from the soft drink bottling industry (83.3%), the beer brewing and bottling industry (42.9%), the tobacco making industry (71.4%), the mattress making industry (11.1%), and minerals crushing mills (87.5%). In the past 20 years, the noise levels in the soft drink bottling industry were reduced by 0.58 dB(A), and those of the beer brewing and bottling industry were reduced by 9.66 dB(A). However, that of the mattress making industry increased by 2.69 dB(A). On average, the noise level in these industries has been reduced by 2.52 dB(A). The results of this study show that the noise control measures put in place have significant impacts on the noise exposure level in the industries surveyed.
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References
Adedayo, O. A. (2000). Understanding statistics. Akoka, Lagos: JAS.
Avwiri, G. O., & Nte, F. (2003). Environmental sound quality of some selected flow stations in the Niger Delta of Nigeria. Journal of Applied Sciences and Environmental Management, 7(2), 75–77.
Bibbuti, B. M., Anup, K. S., & Strivastava, A. K. (2006). Risk from vibration in Indian mines. Indian Journal of Occupational and Environmental Medicine, 10(2), 53–55.
Boateng, C. A., & Amedofu, G. K. (2004). Industrial noise pollution and its effects on the capabilities of workers: A study from saw mills, printing presses and cornmills. African Journal of Health Sciences, 11, 1–2.
Deborah, I. N., Robert, Y. N., Marison, C. B., & Marilyn, F. (2005). The global burden of occupational noise-induced hearing loss. American Journal of Industrial Medicine, 48, 446–458.
Denmark (1975). “The Working Environment Act”, Law No. 681.
Department of Employment (1972). Code of practice for reducing the exposure of employed persons to noise. London: Her Majesty’s Stationary Office.
FEPA (1991). National interim guidelines and standard for industrial effluents, gaseous emission and hazardous waste in Nigeria, Federal Environmental Protection Agency (FEPA) 52.
Georgiescu, L. (2000). Non-auditory damages of industrial noise in workers. Institute of Public Health, Timisoara. Romanania CEJOEM, 2–3, 171–175.
Hassall, J. R., & Zaveri, K. (1988). Acoustic noise measurement (5th ed.). Denmark: Bruel and Kjaer.
Ighoroje, A. D. A., Mardie, C., & Nwobodo E. D. (2004). Noise Induced Hearing Impairment as an Occupational Risk Factor Among Nigerian Traders. Nigerian Journal of Physiological and Science, 19(1–2), 14–19.
ISO Recommendation R-1999 (1971). Assessment of occupational noise exposure for hearing conversation purpose. Geneva: International Standards Organization.
Kisku, G. C., & Bhargara, S. K. (2006). Assessment of noise level of a medium scale thermal power plant. Indian Journal of Occupational and Environmental Medicine, 10(3), 133–139.
Kock, S., Anderson, T., Kolstad, H. A., Kofoed-Niesen, B., Wiesler, F., & Bonde, J. P. (2004). Surveillance of noise exposure in the Danish work place: A baseline survey. Occupational and Environmental Medicine, 61, 838–843. doi:10.1136/oem.2004.012757.
Lipson, C., & Sheth, N. J. (1973). Statistical Design and Analysis of Engineering Experiments. New York: Mc Graw Hill, International.
Michael, P. L. (1973). Physics of Sound. Indian Journal of Occupational and Environmental Medicine (2006), 10, 133–139.
MIOSHA (1993). Occupational Health Standards. Michigan: Department of Labor and Economic Growth.
Natu, M., & Solanki, S. R. (1977). Noise Survey and Effects on State Transport Bus Drivers. Indian J. Occup. Health. 20, 195–200.
Norton, M. P. (1994). Fundamentals of Noise and Vibrations Analysis for Engineers (pp 235–319). Great Britain: Cambridge University press.
Raman, B. (2006). Evaluation of occupational environment in two textile plants in Northern Indian with specific preference to noise. Industrial Health, 44, 112–116. doi:10.2486/indhealth.44.112.
Saadu, A. A. (1988). Community and occupational noise survey and analyses of some selected Nigerian cities and industries. Nigeria: Ph.D. Thesis, University of Benin.
Sharma, P. D. (1993). Environmental Biology and Toxicology. Meerut, India: Ratogi and Company.
U.S. Department of Labour (1974). Occupational safety and health standards, 39(125), Part II.
Ydego, M. (1991). Assessment of noise pollution in Friendship Textile Mill Ltd, Ubango-Dares Salaam. Environmental Engineering, 17, 479–485.
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Oyedepo, O.S., Saadu, A.A. Assessment of noise level in sundry processing and manufacturing industries in Ilorin metropolis, Nigeria. Environ Monit Assess 162, 453–464 (2010). https://doi.org/10.1007/s10661-009-0809-9
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DOI: https://doi.org/10.1007/s10661-009-0809-9