Anaerobic digestion process is gaining attention in the agriculture industry because of its potential for renewable energy production and manure stabilization. These potential benefits are significant against the current backdrop of rising energy costs and growing environmental concerns. Anaerobic digestion is a naturally occurring process through which organic matter such as manure, feed spills, meat processing wastes and crop residues are stabilized by microorganisms strictly in the absence of air. In developing countries, the inadequate management of waste particularly in urban areas where the consumption pattern have changed and the generation rate increased substantially from one location to another and from time to time. This study explored the production of biogas from kitchen wastes mixed with intestinal cow dung in a semi continuous anaerobic digester. Materials used as feed were Paw Paw, tomato, banana peels and intestinal cow dung. Various parameters were determined using standard methods; water displacement method was used to determine the volume of gas produced. The combustibility of the gas generated was tested using Bunsen burner. Microbiological methods were employed for the microbiological analysis. The temperature and pH recorded in the digester range from 27-33oC and 0-6.81c respectively. It was observed that the waste slurry produced biogas without nutrient or chemical addition to the digester. The highest volume of gas (2.8ml) was produced on the 14th day where the temperature (29oC) and pH (6.79) were relatively high. The result of the statistical analysis showed there is significant difference (P<0.05) in the slurry temperature and pH as compared to the volume of gas produced. The Bacteria isolates identified from the digester include Proteus Spp, Bacillus Spp, Escherichia Coli, Klebsiella Spp and Staphyllococcus Spp. Based on this, the search for alternative source of Energy such as Biogas should be intensified so as to curb the incidence of ecological disasters like Environmental pollution, deforestation, desertification and erosion.

The study examined the heavy metal components, physical and chemical parameters of soil samples around selected industrial establishments. This was to ascertain the level that industrial activities impacts on the soil quality with a view to providing a platform for rapid generation of data for environment related decision making and promoting compliance to environmental standards in Ibadan metropolis. Twelve composite soil samples to the depths of 0-15 cm, 15-30 cm, 30-45 cm to represent top and subsoil were collected at each of the selected industrial locations using soil auger for soil physical and chemical properties determination. Data collected were analysed using descriptive and inferential statistics. The mean Pb values for 0-15, 15–30, 30-45 cm soil depths were 5.66± 0.55, 4.58±0.68, 4.52±1.35mg/kg; Cd values were 10.23± 0.60, 9.40 ± 1.33 and 10.55± 0.36mg/kg; Co values were 9.76± 1.00, 9.98 ± 2.57 and 13.58 ± 4.16mg/kg; Cr were 10.18 ± 2.40, 12.53 ±3.17 and 12.1 ± 3.75 and Ni were 11.17 ± 3.55, 12.24 ± 2.19 and 12.53 ± 2.34 mg/kg. For Macro nutrients, Total Organic Carbon (TOC) mean values for BC was 33.50 ± 2.48, 29.3 ± 3.91, 26.6 ± 2.74 and 3.60 ± 0.16 and TN values were 3.60 ± 0.16, 3.40 ± 0.12, and 2.90 ± 0.28 respectively while AC had Total Organic Carbon mean values of 28.03 ± 0.65, 23.5 ± 2.01, 19.24 ± 1.43 and Total Nitrogen (TN) mean values 2.90 ± 0.07, 2.43 ± 0.21 and 1.99 ± 0.15 respectively. For Micro nutrient Mn, Fe, Cu, Zn, the mean values at 0-15, 15-30 and 30-45 soil depth for BC were 39.08 ± 9.57, 32.43 ± 11.93 and 18.78 ± 4.80 for Mn, mean values for Fe were 39.53 ± 15.58, 51.83 ± 14.62 and 34.33 ± 10.68, also mean values for Cu was 8.53 ± 0.32, 8.26± 0.29, 7.99 ± 0.06 and mean values for Zn were 9.01 ± 0.66, 6.62 ±0.21 and 4.42 ± 1.11 respectively. There was a decrease in value with depth which may be associated with downward movement of organic materials and nutrients. The study concluded that industrial activities are impacting on the soil quality with special reference to nutrient and heavy metal contents within and around industrial facilities.

The pollution of ambient air has long been revealed as the most fatal form of environmental pollution. The levels of air pollution vary from one location to another and from time to time. This study investigated the spatiotemporal distribution of air pollutants in Port Harcourt metropolis. Nine points in the study area were purposefully sampled within two pick-periods (8 am and 4 pm), based on high industrial clusters, high vehicular traffic, and rising human population density. The concentrations of PM2.5, PM10, CO, SO2, and NO2 were measured using a hand-held Gas analyser; Aerocet-531 Met One Instrument, Drager X-am 5000. A handheld Germin-300 GPS device analyzer to record the GPS coordinates of the sampling points which aided the data processing, to develop spatial interpolation maps in ArcMap. The results of air quality parameters were above the WHO and FMEnv air quality standards. PM 2.5 and PM10 have a maximum value of 159.23 and 378.39 respectively which is higher than the WHO and FMEnv Standard limits for 24 hours exposure. The recorded exceedance is 68.5ppb, 28.7ppb and 113.7ppb for SO2, NO2, and CO respectively, in the wet season. Also, 71.1ppb, 15.31ppb and 58.9 ppb for SO2, NO2, and CO respectively in the dry season, are higher than WHO and FMEnv limited. Based on these, it is recommended that the populace of Port Harcourt city should limit their exposure, especially in the dry season.