CONSTRUCTED WETLAND SYSTEMS VEGETATED WITH DIFFERENT MACROPHYTES IN THE TREATMENT OF INDUSTRIAL WASTE WATER EFFLUENT

Wastewater effluents generated from the soft drink industry contain pollutants which are higher than what is acceptable for the  discharge in the water bodies in Nigeria. This result in environmental unbalance which causes adverse health issues. In this study, the performance of two macrophytes (Phragmites karkaa and Typha domingensis) in a sub-surface vertical flow constructed wetland was investigated. One hundred litres of wastewater effluent obtained from an Industry (Seven Up Bottling company in Ibadan, Nigeria) was appliedto the systems and the properties of the waste water effluent as well as the performance of the treatment tankswith respect to parameters such as; pH; TDS; TSS; DO; BOD5; turbidity; nitrate and phosphate were evaluated.The treatment performance of the systems was evaluated for a retention period of 6, 12 and 18 days. It wasobserved that parameters such as pH, BOD5; and TSS did not conform to the acceptable limits; they had valuesgreater than those prescribed in the standards for discharge. The value for BOD5 was 652 mg/l and after sixdays retention in the vegetated tanks had reduced by at least 98%. The unvegetated control setup only reducedthe BOD5 by 40.18% after the first six days of treatment. The performance of the Phragmites karka and theTypha domingensis in the removal of organic substances and solid pollutants were similar with both plantseffectively removing the pollutants. However, Typha domingensis performed better than Phragmites karakain removing organic pollutants and Phragmites karka gives clearer water than Typha domingensis in terms ofturbidity

The Dynamics of Ports Reforms in Nigeria: Implications for Sustainable Ports Operations

Over the time Nigeria economy is largely public sector driven, in which the seaports were not left out: managed by Nigerian Port Authority (NP A). With the seaports under the autonomous of NPA were faced with strangulating problems ranging from inefficiency of it services rendered, insecurity of ships and cargo, lack of modern infrastructures, inefficiency of the NPA staff and excess bureaucracy and sharp practice (corporate) these factors make port tariff on import and export higher than they need to be, couple with the technology trend in maritime transport which required huge capital fund. The government call for ports reforms; a reform that will liberalized and deregulate the seaport by the use of concession contract, this mandate the NPA to transfer terminals operators while NPA concentrates to play the role of landlord oversight functions. The government went further to reform the import guidelines procedures and documentation requirement, changing it form Pre-shipment Inspection (PSI) to Destination Inspection (DI). The Seaport reforms which government introduced in 1996 eliminated the crippling delays in the clearance of import goods in the ports. This research study will examine the dynamics of port operations, the contribution of private operator in seaport operations, and services; technological development: considering the variable attached to seaport operations. Furthermore, this research analyze private sector capital investment in port and maintenance of infrastructures, superstructures and the contract of concession with other practicing nations, while from drawn questionnaire and secondary data the research will examine how and if Nigeria will benefit in the area of capacity building, physical development and if at all there is competition among the terminal operators considering there role in the concession regime. Finally, emphasis and comparison will be laid on cargo throughout, ship tum around, clearing procedures and port charges with the involvement of private participation. DOI: 10.7176/PPAR/11-7-01 Publication date:August 31st 202

Municipal wastewater management using Vetiveria zizanioides planted in vertical flow constructed wetland

This study investigated wastewater management using Vetiveria zizanioides planted in vertical flow constructed wetland (VFCW). Wastewater from the grit removal chamber and the primary sedimentation tank of Daspoort Wastewater Treatment Works was fed into six-pilot VFCW consisting of 1000-L plastic tanks having 500-mm-deep, 10–15-mm-diameter granite substrate planted with V. zizanioides. Irrigation of macrophytes using effluent from the grit removal chamber and primary sedimentation tanks was done after 3 months of planting and the VFCW monitored. Wastewater samples were collected and analysed using standard procedures. The pollution parameters of the initial sample were total alkalinity 297 ± 27.3 mg/L; COD 627 ± 149.0 mg/L; EC 82.53 ± 5.4 ms/m; free and saline ammonia 36.02 ± 4.1 mg/L, nitrate/nitrite 0.09 ± 0.1 mg/L; pH 7.66 ± 0.4; phosphate 3.07 ± 0.3 mg/L, sulphate 44.57 ± 3.1 mg/L; TDS 551 ± 37.8; TSS 319 ± 34.2 mg/L; and TKN 41 ± 6 mg/L. Percentage removal of 89.57, 98.34% TSS; 98.95, 98.62 free and saline ammonia; 89.87, 91.44% TKN; and 80.65, 58.02% COD for screen and settled wastewater, respectively, was obtained from the VFCW. VFCW using locally available V. zizanioides is a viable alternative for municipal wastewater treatment

Municipal wastewater treatment using sequential activated sludge reactor and vegetated submerged bed constructed wetland planted with Vetiveria zizanioides

This study investigated a sequential system consisting of Biological Nutrient Removal Activated Sludge(BNRAS) and Vegetated Submerged Bed Constructed Wetlands (VSBCW). The BNRAS/VSBCW combination removing pollutants from municipal wastewater in a developing country was examined. Wastewater from the anaerobic, anoxic and aerobic zones of the BNRAS was fed into 12 pilot VSBCW consisting of 1000 L plastic tanks having 500 mm deep 10–15 mm diameter granite substrate planted with Vetiveria Zizanioides. Irrigation of macrophytes using effluent from the BNRAS was done after 3 months of planting and the VSBCW effluent analyzed. Wastewater samples were collected and analyzed using standard procedures. Percentage removal of 96.6, 96.93, and 97.21% of COD; 33.33, 85.71, and 92.48% of Nitrate/Nitrite;53.51, 46.45, and 88.78% of Sulphate; and 98.34, 99.72, and 99.6% of TSS were obtained from the anaerobic, anoxic and aerobic zones respectively. Removal efficiency from the anaerobic zone effluent was highest during the study period. VSBCW using locally available macrophytes V. Zizanioides in combination with BNRAS was found efficient in municipal wastewater treatment

Climate Change Dynamics and Imperatives for Food Security in Nigeria

Decadal variability in African rainfall is projected from General Circulation Models (GCMs) to continue under elevated greenhouse gas scenarios. Effects on rain intensity, spatio-temporal variability of growing seasons, flooding, drought, and land-use change impose feedbacks at regional-local scales. Yet, empirical knowledge of associated impacts on crop yield is limited; thus, we examined the imperatives for food security in Nigeria. Bivariate correlation and multiple regression suggests impending drought in the northern region where livestock farming is predominant. Relative contributions of climate independent variables in determining crop yield by backward selection procedures with stepwise approach indexed the impacts of annual climate variability by a parameter computed as annual yield minus mean annual yield divided by the standard deviation. Results show Z-distribution approximately 5 to + 5, when 3 indicate impacts significant at 95% confidence levels. In conclusion, we established the interwoven relationship between climatic change and food security

An Assessment of Water Related Diseases in a Nigerian Community

Information on the general health problems in Ota was provided while the ailments that are directly related to water were highlighted and discussed. The information was gathered by questionnaire application, using non-quota sampling technique. The target respondents were health care workers such as doctors, nurses and pharmacists who work in hospitals and primary health care centers situated in the municipality. It was observed that out of the top seven diseases that are most frequently reported in Ota, five were water related. These diseases include malaria, typhoid, vital organ failure, cholera and skin disease. Reasons for the high level of water related ailments were explained by poor level of supply of potable water to the municipality, as well as poor sanitation practices by the residents

Appraisal of access to safe drinking water in southwest Nigeria

The importance of developing effective water supply services is universally recognised as a basis for improving the overall health of the population. This study ascertained the quality of water supplied by a water treatment scheme in southwest Nigeria. One hundred and twelve samples were collected during the wet and dry seasons. Tests on physico-chemical and bacteriological parameters were conducted. Statistical analysis of variance was carried out on the results of the test. The effectiveness of the treatment processes on the parameters considered showed that the aeration, sedimentation and filtration processes were 70.13% effective in colour removal; sedimentation and filtration processes were 94.78% effective in turbidity removal; sedimentation and filtration process were 28.84% effective in the removal of total suspended solids (TSS) and 9.88% effective in the removal of total solids (TS); the disinfection and filtration processes were 100% effective in bacterial and coliform removal. The treatment system was found to be 71.38% effective in pollutant removal