The use of compost on land is imperative as part of soil remediation approach as well as to impro... more The use of compost on land is imperative as part of soil remediation approach as well as to improve plant growth. The objective of this study was to determine the phytotoxicity of compost made from market waste and cow dung. Feed stocks comprising of market waste, cattle dung and freshly-cut grasses were composted while market waste only served as the control. The effect of compost on germination of seeds was determined using viable cowpea (Vigna unguiculata) seeds in containing vessel at varying ratios of the compost with planting soil for 10 days. Presence of heavy metals was determined using Atomic Absorption Spectrometry (AAS). Temperature and pH as well as microbial population were monitored. Compost temperature range gave an initial rise of 55°C and reduced steadily while the pH ranged from 7.4 to 9.0. Bacterial load ranged from 3.4x10 to 1.3x10 CFU/g while fungal load ranged 1.5x10 to 4.9x10 CFU/g. Isolated microorganisms were 5 6 5 5 Bacillus sp, Pseudomonas sp, Proteus sp, Aspergillus sp and Fusarium sp. After maturation period of 60 days, Nickel (Ni) was found to have the highest concentration of 0.9555mg/Kg while Cadmium (Cd) had the lowest concentration of 0.0588mg/Kg in the final stage of the compost. The compost was found to be phytotoxic as there was no visible growth of cowpea that was cultivated using the compost in various ratios except in the control which showed germination.
Physical and chemical methods of remediating contaminated soils are less environment-friendly com... more Physical and chemical methods of remediating contaminated soils are less environment-friendly compared to the biodegradation method. This study investigated the ability of selected organic wastes to enhance biodegradation of Spent Engine Oil (SEO) contaminated soil. One kilogram of uncontaminated soil was thoroughly mixed with 10% (w/v) SEO in seven treatments with two replicates. Spent Fruit Residues (SFR), Cassava Peel (CP) and a combination of Bean Husk and Chromolaena odorata (BHC) were added at 10% and 20% (w/w), with an untreated control. Total Heterotrophic Bacterial Count (THBC), Total Fungal Count (TFC), Total Hydrocarbon Degrading Bacterial Count (THDBC) and Total Hydrocarbon Degrading Fungal Count (THDFC) of the contaminated and uncontaminated soils were determined using standard micro-biological methods. Isolates were screened for SEO utilization using 2,6-dichlorophenol indo-phenol indicator. Hydrocarbon contents of the soils were determined using Gas Chromatography-Mass Spectrometry (GC-MS). The data obtained were subjected to statistical analysis. The THBC ranged from 1.3x10 6 to 2.9x10 6 CFU/g, TFC ranged from 5.4x10 4 to 2.0x10 5 CFU/g, THDBC ranged from 0.5x10 3 to 1.9x10 4 CFU/g while THDFC ranged from 2.0x10 3 to 1.0x10 4 CFU/g. The isolated bacteria were and Enterobacter cloacae while the isolated fungi were Candida spp., Aspergillus niger, Saccharomyces cerevisae, Penicillium chrysogenum and Trichophyton sp. Pseudomonas aeruginosa and Aspergillus niger utilized the oil better than other isolates with absorbance of 0.26 and 0.49 at 600 nm, respectively. The GC-MS revealed that SFR 20% (w/w) treatment had the highest percentage degradation of 70.5%. This study confirms that spent fruit residues can enhance biodegradation of spent engine oil contaminated soil.
The study investigated the attitudes of secondary school students towards science in Odeda Local ... more The study investigated the attitudes of secondary school students towards science in Odeda Local Government Area of Ogun State, Nigeria. Two hundred senior secondary school students consisting of 84 males and 116 females were selected from five secondary schools using stratified random sampling techniques. A 20-item Attitude to Science Questionnaire on a five-point likert scale was adopted for the study. The instrument has a reliability coefficient of 0.73 using Cronbach's reliability method. Frequency counts and percentages were used to obtain an overall picture of students' attitude towards science while student's t-test was used to find out whether there was significance difference between the attitude of male and female students. Findings showed that a higher proportion of the students display positive attitude towards science. Also, there was no significant difference between the attitude of male and female students towards science.
The use of compost on land is imperative as part of soil remediation approach as well as to impro... more The use of compost on land is imperative as part of soil remediation approach as well as to improve plant growth. The objective of this study was to determine the phytotoxicity of compost made from market waste and cow dung. Feed stocks comprising of market waste, cattle dung and freshly-cut grasses were composted while market waste only served as the control. The effect of compost on germination of seeds was determined using viable cowpea (Vigna unguiculata) seeds in containing vessel at varying ratios of the compost with planting soil for 10 days. Presence of heavy metals was determined using Atomic Absorption Spectrometry (AAS). Temperature and pH as well as microbial population were monitored. Compost temperature range gave an initial rise of 55°C and reduced steadily while the pH ranged from 7.4 to 9.0. Bacterial load ranged from 3.4x10 to 1.3x10 CFU/g while fungal load ranged 1.5x10 to 4.9x10 CFU/g. Isolated microorganisms were 5 6 5 5 Bacillus sp, Pseudomonas sp, Proteus sp, Aspergillus sp and Fusarium sp. After maturation period of 60 days, Nickel (Ni) was found to have the highest concentration of 0.9555mg/Kg while Cadmium (Cd) had the lowest concentration of 0.0588mg/Kg in the final stage of the compost. The compost was found to be phytotoxic as there was no visible growth of cowpea that was cultivated using the compost in various ratios except in the control which showed germination.
Physical and chemical methods of remediating contaminated soils are less environment-friendly com... more Physical and chemical methods of remediating contaminated soils are less environment-friendly compared to the biodegradation method. This study investigated the ability of selected organic wastes to enhance biodegradation of Spent Engine Oil (SEO) contaminated soil. One kilogram of uncontaminated soil was thoroughly mixed with 10% (w/v) SEO in seven treatments with two replicates. Spent Fruit Residues (SFR), Cassava Peel (CP) and a combination of Bean Husk and Chromolaena odorata (BHC) were added at 10% and 20% (w/w), with an untreated control. Total Heterotrophic Bacterial Count (THBC), Total Fungal Count (TFC), Total Hydrocarbon Degrading Bacterial Count (THDBC) and Total Hydrocarbon Degrading Fungal Count (THDFC) of the contaminated and uncontaminated soils were determined using standard micro-biological methods. Isolates were screened for SEO utilization using 2,6-dichlorophenol indo-phenol indicator. Hydrocarbon contents of the soils were determined using Gas Chromatography-Mass Spectrometry (GC-MS). The data obtained were subjected to statistical analysis. The THBC ranged from 1.3x10 6 to 2.9x10 6 CFU/g, TFC ranged from 5.4x10 4 to 2.0x10 5 CFU/g, THDBC ranged from 0.5x10 3 to 1.9x10 4 CFU/g while THDFC ranged from 2.0x10 3 to 1.0x10 4 CFU/g. The isolated bacteria were and Enterobacter cloacae while the isolated fungi were Candida spp., Aspergillus niger, Saccharomyces cerevisae, Penicillium chrysogenum and Trichophyton sp. Pseudomonas aeruginosa and Aspergillus niger utilized the oil better than other isolates with absorbance of 0.26 and 0.49 at 600 nm, respectively. The GC-MS revealed that SFR 20% (w/w) treatment had the highest percentage degradation of 70.5%. This study confirms that spent fruit residues can enhance biodegradation of spent engine oil contaminated soil.
The study investigated the attitudes of secondary school students towards science in Odeda Local ... more The study investigated the attitudes of secondary school students towards science in Odeda Local Government Area of Ogun State, Nigeria. Two hundred senior secondary school students consisting of 84 males and 116 females were selected from five secondary schools using stratified random sampling techniques. A 20-item Attitude to Science Questionnaire on a five-point likert scale was adopted for the study. The instrument has a reliability coefficient of 0.73 using Cronbach's reliability method. Frequency counts and percentages were used to obtain an overall picture of students' attitude towards science while student's t-test was used to find out whether there was significance difference between the attitude of male and female students. Findings showed that a higher proportion of the students display positive attitude towards science. Also, there was no significant difference between the attitude of male and female students towards science.
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