PERFORMANCE EVALUATION OF ABESAN WASTEWATER TREATMENT PLANT

The performance of the Abesan wastewater treatment plant situated at the Abesan Low Cost Housing Estate, Abesan, Lagos had been evaluated. The treatment plant operates on biological treatment method (Activated Sludge Process) with an average wastewater inflow of 6 MLD has been considered for the case study. Thirty – six (36) grab samples of wastewater influent and effluent were collected over a period of six weeks during the dry and rainy seasons. The samples were analyzed for different wastewater quality variables. Average removal efficiencies of the measured parameters from the treated effluents were 96.3% for Chemical Oxygen Demand (COD), 93.3% for Biological Oxygen Demand (BOD), 92.4% for Total Suspended Solids (TSS), and 41.6% for Total Dissolved Solids (TDS) for the dry season. The rainy season average removal efficiency of the measured parameters were 96.8% for COD, 94.6% for BOD, 95.9% for TSS, and 38.6% for TDS. The values obtained for the dry season are lower than that obtained in the rainy season except for TDS. Most of the values of the effluent parameters exceeded the regulatory requirement of the Federal Environmental Protection Agency guideline for effluent limitation. The results obtained from this research conclude that regular routine de-silting and maintenance works of the plant be carried out to allow effective running of the plant

An Experimental Investigation of Influence of Relative Humidity on Thermal Performances of a Parabolic Trough Solar Concentrator

Solar energy is considered by many as a highly prospective alternative energy source due to its ability to meet a significant portion of the world's energy demand. The effectiveness of a solar concentrator depends on operational and atmospheric conditions. This paper presents an experimental analysis of the influence of humidity coupled with inclination angle and mass flow rate on the performance of a parabolic trough solar concentrator.  The parabolic trough solar collector underwent experimental testing at the LAUTECH engineering facility in Ogbomoso. It possesses a collector length of 2.1m, an aperture width of 1.2m, an adjustable rim angle of 75o, 90o, and 105o, a focal length of 30 cm, a 10-liter storage reservoir, and variable flow rates of 0.0004 m3/s, 0.0008 m3/s, and 0.0012 m3/s. Temperatures were measured using a 12-channel temperature recorder (SD data logger), solar radiation was measured using a solar meter, relative humidity was measured using an environment meter,  and water was used as the working fluid. Thermal performance analysis was conducted to ascertain the impact of relative humidity coupled with tilt angle, mass flow rate, and weather conditions on the solar concentrator's effectiveness. The findings reveals that at higher mass flow rates and a 90° tilt angle, the system has a greater thermal efficacy with weather elements such as solar intensity and relative humidity. Parabolic trough concentrators' performance is determined by the amount of solar intensity focused onto a receiver tube and high humidity in the air reduces the quantity of direct solar radiation that reaches the concentrator and high relative humidity reduces the thermal effectiveness of the system. While relative humidity may not be the main factor influencing the performance of a parabolic trough concentrator, its effects on thermal efficiency and heat exchange should be taken into account when designing and operating such solar thermal systems, especially in environments with varying humidity levels. Keywords Parabolic Trough Collector, Heat loss, Thermal efficiency, Humidity. DOI: 10.7176/JEES/14-2-05 Publication date:March 31st 202

ERGONOMICS INVESTIGATION OF MUSCULOSKELETAL DISORDER AMONG THE WORKFORCE OF WASTE MANAGEMENT INDUSTRY IN NIGERIA

The objective of this study is to undertake an Ergonomic Scrutiny of Desecrate Management Industry. Ten (10) employees of the parking and collection department of Kim Waste Management Authority (KWMA) were selected. Their activities were video and recorded while working and their different postures were analyzed using Rapid Entire Body Assessment (REBA) and Rapid Upper Limb Assessment (RULA). Result showed that 10% were at medium risk; 40% were at high risk and 50% were at very high risk for the workers in KWMA. It as discovered that workers are subjected to Musculoskeletal Disorder (MSDs) as a result of the postures adopted during the work process