Assessment of Airborne Micro-organisms (Bioaerosols) In The Vicinity of Some Waste Dumpsite in Umudike, Abia State (Published)
Environmental pollution from waste dump sites is a major concern to both environmental scientists and individual citizens. The study aimed at determining the microbial loads of air in the vicinity of various dumpsites in Michael Okpara University of Agriculture, Umudike using standard pour plate and spread plate microbiological techniques. Air samples were collected from selected dumpsites in the study area. The sampling time was 5 to 10 minutes interval and the sampling was 5 to 10meters at 26ºc and 37 º c temperature ranges for both bacterial and fungal load. The results shows that DUB for 37ºc nutrient agar count recorded the lowest microbial load of 15333.33±3785.94 (cfu/m3) at distance 5meters in 5mins while DUB had the highest microbial load of 82333.33±5859.47 (cfu/m3) in 5mins. DUA for 26ºc nutrient agar count in 10mins recorded the lowest microbial load mean± standard deviation values of 4366.67±3412.23 (cfu/m3) while DUB in 10mins has the highest microbial load of 47666.67±2516.61 (cfu/m3) at distance 5meters. At 37ºc potato dextrose agar, distance 5meters has the lowest microbial load value at DUC in 10mins 5633.33±57.74 (cfu/m3) while the highest microbial load count level is in DUB in 5mins 34166.67±47500.98 (cfu/m3). There is no significant increase in the mean values of DUA in 5min, DUA in 10mins and DUC in 5mins with respective values of 5166.67±1724.34, 4700.00±300.00 and 1866.67±665.83 (cfu/m3). The microbial loads of the air samples taken from the dumpsites were higher than the normal atmospheric concentration of the microorganisms as the reported average level of the microbes in the ambient air is 3.0 log10 cfu/ml. The bacterial genera isolated were Bacillus sp, B. subtilis, B. cereus, Staphylococcus sp, Streptococcus sp and Micrococcus sp., while the fungal isolates were Aspergillus fumigatus, Aspergillus niger, Penicillium notatum and Fusarium sp. This study indicates that potential airborne pathogens not only abound in the vicinity of waste dumpsites but also decreased with increasing distance from the dump sites. It is therefore recommended that students should be educated on alternative waste management options, so that gradually the dumpsites can be closed.
Characterization and Modelling Of Air Pollutants Transport from Panteka Market, Jimeta-Yola, Nigeria (Published)
The primary motivation of the current research was to apply Land GEM model to predict gaseous pollutant mobility by means of pollutant concentrations, annual waste mass received, and dumpsite open year from the research area. Land GEM model is believed to have wide application on emission rates from landfills/dumpsites using both site specific and default model parameters. Emission concentration levels were achieved through field and laboratory experimental work from vegetable waste dumpsites using scientific calibrated instruments. Data obtained were applied on Land GEM computer based software; version 3.02 in order to predict air-pollutant transport from the market environment and her surroundings. The model was tested to ascertain its validity where the measured and simulated values indicated good match with an error of 3.8% .The closure year of the case study dumpsite A was predicted to be in 2074 having reached hazardous level in 2024 while control dumpsite B predicted a closure year of 2023 and hazardous level in 2019 with modeling efficiency of 64%. Understanding the types of gases emitted from decomposing vegetable waste dumpsites (CH4, CO2, NMOC, H2S) and their transport pattern could go a long way to ensuring control measures of these pollutions there by having a sustainable zero wastes market to boost economic activities under pleasant environment; hence healthy environment is a prerequisite of healthy life, and fighting pollution is definitely the best way of healthy life.