Assessment of Noise Exposure of Sawmill Workers in Southwest, Nigeria

Ajayeoba, Abiola Olufemi; Olanipekun, Adewoye A.; Raheem, W. A.; Ojo, Oluwaseun O.; Soji–Adekunle, Ayowumi R.

doi:10.32604/sv.2021.011639

Cited by 5 publications

(8 citation statements)

References 18 publications

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“…Thus, several studies had previously been conducted on different types of groups towards assessing and evaluating the impacts of noise levels and their implications; such as sawmill workers, occupants of industrial hubs, wheat processing workers, secondary school students, occupants of municipals, textile company workers, neighborhood residents, etc. (Forida, et al, 2020;Ajayeoba, et al, 2021;Farooq, et al, 2019;Akinyemi, et al, 2019;Ibrahim, et al, 2014;Godson, et al, 2009;Ibekwe, et al, 2016), Although some of these studies reported detrimental effects of noise pollution on various groups, yet, many did not proffer adequate means of controlling the hazardous effects, asides that, there is a paucity of information on the study area considered in this study. Therefore, this study aimed at conducting investigations into the effect of anthropogenic noise pollution in students' residential areas in Ogbomoso and subsequently proffered appropriate control measures to contain the spread.…”

Section: Introductionmentioning

confidence: 94%

“…The equivalent continuous sound level (Leq) was measured directly by the SLM as digital numerical, showed values that stabilized after about 30s (Ajayeoba, et al, 2021). The SLM was designed to be hand-held such that the microphone attached to the SLM faced the catchment of the sound source and simultaneously very close to the respondent since the effect of noise level on the respondents is one of the major objectives of this study.…”

Section: Sound Level Data Collection and Analysismentioning

confidence: 99%

“…The SLM was designed to be hand-held such that the microphone attached to the SLM faced the catchment of the sound source and simultaneously very close to the respondent since the effect of noise level on the respondents is one of the major objectives of this study. The average noise pollution levels were then calculated using Equation 1 (Ajayeoba, et al, 2021) and compared permissible noise exposure time per day in Table 1. Data collected were presented on an excel spreadsheet in preparation for analyses.…”

Section: Sound Level Data Collection and Analysismentioning

confidence: 99%

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Assessments and Control of Anthropogenic Noise Pollution in Students’ Residential Areas in Ogbomoso

Ajayeoba

2021

LAUJOCES

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Increased rate of noise-associated risk factors such as speech interference and reduction in productivity, necessitated that control and regulation measures be put in place, to contain anthropogenic noise pollution in the students’ hostels. Therefore, this study assessed the various anthropogenic sources of noise pollution in students’ hostels and developed a Sound Level Monitor and Control (SLMC) device. 1250 undergraduate students across 5 students’ residential zones were sampled for demographics and investigations were conducted into respondents’ perceived medical history, identification of noise sources, and evaluation of hearing loss. Effects of noise levels were evaluated using 100 respondents’ rooms per zone following standard procedures, considering Sound-System-Only (SSO), Generators-Only (GO), and combination of Sound-System-and-Generator (SSG), loud-conversations, etc., as sources of noise. However, a noise control device incorporated with a circuit breaker was developed. The respondents were 51.2% male and 48.8% female, with 58% in the age range 18 – 27 years. The medical history showed that 1.2 and 6.4% had a hearing problem in short and long times, respectively, while 43.6% affirmed that SSO was a major noise pollution causal factor. SSO, GO, loud conversations, traffic, and grinding machines were identified as the prominent sources of anthropogenic induced noise. The minimum average SL result gave a value of 62.8400dB for both ventilated and unventilated rooms, which is 14% above 55dB threshold value recommended by the National Environmental Standards and Regulations Enforcement Agency. The developed SLMC device gave notification at the SL above 55dB for 15 seconds before disconnecting the sound system if not regulated.

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Section: Introductionmentioning

confidence: 94%

Section: Sound Level Data Collection and Analysismentioning

confidence: 99%

Section: Sound Level Data Collection and Analysismentioning

confidence: 99%

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Assessments and Control of Anthropogenic Noise Pollution in Students’ Residential Areas in Ogbomoso

Ajayeoba

2021

LAUJOCES

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“…U.S. Occupational Safety and Health Administration (OSHA) has reported the comfortable and safest level of sound pressure that any human ear can perceive for longer durations as less than or equal to 85 dB [32,33]. Another study on the interiors of a fully functional woodworking factory has carried out the acoustic measurements as A-weighting [34]. Hence, an analyses of SPL(A) is more relevant than SPL(Z).…”

Section: Influence Of Vertical Beam Angle On Spl(a) and Spl(z) In Bas...mentioning

confidence: 99%

Airborne Acoustic Transmission and Terrain Topography at SAINTGITS Amphitheatre: An Analysis of Outdoor Auditory Perception and Comparison of Contour Plots

Varghese¹,

Thomas²,

Herbert³

et al. 2022

Sound&Vibration

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The arrangement of natural and physical features on the earth's surface are a few among the countless items that govern the airborne acoustic transmission at boundary layers. In particular, if the acoustic waves are attributes of live concerts at open-air theatres, without losing the sheen and quality, the audience should certainly receive the unbroken depth of the performance. Hence, at all times, it is advisable to analyse the auditory receptiveness, particularly in all intended recreational spaces. The current pandemic circumstances and the mandated COVID-19 prevention protocols encourage gatherings in naturally ventilated outdoor regions than confined indoors. This work predicts and quantifies the acoustic experience at the naturally carved amphitheatre at SAINTGITS, an autonomous institution at the down South-West of the Indian Subcontinent. The entire recreational space at SAINTGITS AMPHI was separately modelled as a Base case and Advanced case, and were analysed using the acoustic modelling module of EASE Focus, a renowned simulation freeware, which is in strict adherence with the International standards. The variation in loudness received at the nearest and farthest ends of the amphitheatre was between 67 to 80 dB. Though the Zero frequency SPL (Z-weighting) exhibited the loudness in the range of 81 to 85 dB and could maintain a safer auditory level for any human ear, it was confined to a hemispherical region near the sound source. A vertical beam angle of −4.0°was found to be effective throughout. The procedures and analyses will certainly help the future organizers and stakeholders to effectively plan the resources to reap rich acoustic experience at terrain-centric locales. The surface topography and contours were plotted with another set of freeware, the CADMAPPER and the QUIKGRID, to compare terrain gradient with the known data. Furthermore, this interdisciplinary research exhibits the extensive simulation capability of both EASE Focus and QUIKGRID and demonstrates the modelling versatility and deliverable potential of these freeware to benefit the budding architects and researchers.

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“…Therefore, this study carried out the enhancement of biogas production from sawdust fibers using sustainable pretreatment methods. This was carried out in order to solve the problem of indiscriminate disposal of sawdust in sawmills and poultry dung by poultry farmers, through open burning and dumping in the environment (Ajayeoba et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Biogas Production from Sawdust through Sustainable Alkaline and Biological Pretreatment Methods

Olanipekun

Oladejo

2022

LAUJOCES

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This study aims to enhance biogas production from sawdust fibers Quercus genus (oak) using sustainable pretreatment methods. Sawdust and poultry dung (substrates) were obtained in Ogbomoso and delignification of oak samples was carried out through gravimetric method on 5, 10, and 15 days before and after digestion. Physico-chemical parameters were analyzed according to American Public Health Association (APHA) (2018) standard. Anaerobic digestion on substrates was performed through alkaline and biological pretreatment processes, biogas samples were collected and analyzed using gas chromatograph mass spectrometer. Pretreatment results for delignification of raw sawdust, alkaline and biological pretreated at 5, 10 and 15 days were; 13.5, 2.0, 1.5, 1.0 and 1.0 in mg/l. Physico-chemical results of substrates before and after digestion respectively were; pH (7.38, 8.12); alkalinity (350, 475); Nitrogen (25.5, 38.2); Phosphorus (2.67, 2.43); Carbon (192.8, 342.1); Potassium (4.1, 3.5); Phosphate (56.0, 128); Sulphate (74.0; 69.0), Calcium (12, 44); Magnesium (65, 36); Manganese (0.010, 0.031), Iron (5.2, 6.1); Zinc (25.0, 17.4); Aluminium (0.35, 0.34); Copper (2.5, 2.5); Biochemical Oxygen Demand (110, 175); Chemical Oxygen Demand (964, 1440); Carbon/Nitrogen ratio (8:1, 9:1); Volatile Solids (1216, 4560); Moisture Content (25.8%, 63.1); Total Solids (66.2%, 17.8%) and Volume of Solids (58.2%, 77.7%) in mg/l. Biogas samples composition from biological and alkaline pretreatments were: Methane (65.05%, 62.27%); and Carbon Dioxide (17.51%, 13.28%). Both pretreatment methods produced enough methane percentages, but biological pretreatment performed better. This work is applicable in sustainable biogas production for environmental protection.

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Assessment of Noise Exposure of Sawmill Workers in Southwest, Nigeria

Cited by 5 publications

References 18 publications

Assessments and Control of Anthropogenic Noise Pollution in Students’ Residential Areas in Ogbomoso

Assessments and Control of Anthropogenic Noise Pollution in Students’ Residential Areas in Ogbomoso

Airborne Acoustic Transmission and Terrain Topography at SAINTGITS Amphitheatre: An Analysis of Outdoor Auditory Perception and Comparison of Contour Plots

Enhancement of Biogas Production from Sawdust through Sustainable Alkaline and Biological Pretreatment Methods

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