Performance Characteristics of Pollutants along the Longitudinal Profile of a Subsurface Flow Constructed Wetland Domestic Sewage Treatment Plant in the University of Lagos, Nigeria

Adelere Ezekiel Adeniran, Adetinuke Aina, Omolaraeni Oshunrinade

Department of Civil & Environmental Engineering and Director of Works & Physical Planning, University of Lagos, Lagos, Nigeria.
Works and Physical Planning Department, University of Lagos, Lagos, Nigeria.

DOI: 10.4236/jwarp.2014.62015                

Abstract

The paper reports the findings of a research work carried out to examine the performance and efficiency of a subsurface constructed wetland (SSFCW) for the treatment of domestic sewage in the University of Lagos (Unilag), Nigeria. The removal patterns and efficiencies of the physical, chemical and biological sewage pollutants parameters of domestic waste water generated within Unilag community by the SSFCW were studied. The wastewater was sampled and analysed along the SSFCW from influent (point1) to effluent (point 11). Total Dissolved Solids (TDS) reduced from 471 mg/l to 11.85 mg/l (97.48%), Turbidity reduced from 108.75 HTU to 0.05HTU (99.95%), Manganese reduced from 6.05 mg/l to 0.61 mg/ (89.92%), Nitrate reduced from 27.5 mg/l to 2.0 mg/l (92.73%), Sulphate reduced from 48.5 mg/l to 28 mg/l (42.27%), Iron reduced from 1.13 mg/l to 0.03 mg/l (97.35%), BOD reduced from 73.14 mg/l to 12.8 mg/l (82.5%), and E-coli reduced from 874 MPN/100 ml to 0.15 MPN/100 ml (99.98%). On the other hand, Dissolved Oxygen content increased along the SSFCW from 3.14 mg/l to 7.49 mg/l (138.54%) while the pH improved from slightly acid level of 6.49 to slightly above neutral level of 7.05 (9.3%). All the parameters at effluent point are within the Nigerian Federal Environmental Protection Agency (FEPA) acceptable standard. The study concludes that the SSFCW is a cheap, efficient and appropriate technology for the treatment of domestic sewage under tropical conditions.

Keywords

Subsurface Flow; Constructed Wetland; Domestic Sewage; Pollutants Removal

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	D. Demirezen, A. Aksoy and K. Uruc, “Effect of Population Density on Growth, Heavy Metals by the Aquatic Plants Potamogeton pectinatus L. and Potarnogeton Biomass and Nickel Accumulation Capacity of Lemna gibba (Lemnaceae),” Chemosphere, Vol. 66, No. 3, 2007, pp. 553-557. http://dx.doi.org/10.1016/j.chemosphere.2006.05.045
[2]	C. B. Zhang, J. Wang, W. L. Liu, S. X. Zhu, D. Liu, S. X. Chang, J. Chang and Y. Ge, “Effects of Plant Diversity on Nutrient Retention and Enzyme Activities in a Fullscale Constructed Wetland,” Bioresource Technology, Vol. 101, No. 6, 2010, pp. 1686-1692. http://dx.doi.org/10.1016/j.biortech.2009.10.001
[3]	M. A. Maine, N. Suné, H. Hadad, G. Sanchez and C. Bonetto, “Influence of the Malaianus Miq and Their Potential Use for Contamination Indicators and in Wastewater Treatment,” Science of the Total Environment, Vol. 392, 2009, pp. 22-29.
[4]	C. L. Murray-Gulde, G. M. Huddleston, K. V. Garber and J. H. Rodgers, “Contributions of Schoenoplectus californicus in a Constructed Wetland System Receiving Copper Contaminated Wastewater,” Water Air Soil Pollution, Vol. 163, No. 1-4, 2005, pp. 355-378. http://dx.doi.org/10.1007/s11270-005-1297-3
[5]	M. Scholz and B.-H. Lee, “Constructed Wetlands: A Review,” International Journal of Environmental Studies, Vol. 62, No. 4, 2005, pp. 421-447.
[6]	A. E. Adeniran, “The Efficiency of Water Hyacinth (Eichornia crassipes) in the Treatment of Domestic Sewage in an African University,” AWRA 2011 Annual Water Resources Conference, Albuquerque, 7-10 November 2011.
[7]	USEPA, “Manual. Constructed Wetlands Treatment of Municipal Wastewaters,” EPA/625/R-99/010, United States Environment Protection Agency, Office of Research and Development, Cincinnati, 2000.
[8]	W. F. DeBusk, “Wastewater Treatment Wetlands: Applications and Treatment Efficiency,” Soil and Water Science Department, University of Florida, SL156, 1999.
[9]	Interstate Technology & Regulatory Council, “Technical & Regulatory Guidance for Constructed Treatment Wetlands,” United States Environmental Protection Agency, 2003.
[10]	J. S. Weis and P. Weis, “Metal Uptake, Transport and Release by Wetland Plants: Implications for Phytoremediation and Restoration,” Environment International, Vol. 30, No. 5, 2004, pp. 685-700. http://dx.doi.org/10.1016/j.envint.2003.11.002
[11]	D. P. L. Rousseau, E. Lesage, A. Story, P. A. Vanrolleghem and N. De Pauw, “Constructed Wetlands for Water Reclamation,” Desalination, Vol. 218, No. 1-3, 2008, pp. 181-189. http://dx.doi.org/10.1016/j.desal.2006.09.034
[12]	J. Vymazal and L. Kropfelova, “Wastewater Treatment in Constructed Wetlands with Horizontal Sub-Surface Flow,” Springer, Netherlands, 2008.
[13]	I. O. Asia and E. E. Akporhonor, “Characterization and Physicochemical Treatment of Wastewater from Rubber Processing Factory,” International Journal of Physical Sciences, Vol. 2, No. 3, 2007, pp. 61-67.
[14]	G. Prasad, R. Rajeev and A. K. Chopra, “Sand Intermittent Technology for Safer Domestic Sewage Treatment,” Journal of Applied Sciences and Environmental Management, Vol. 10, No. 1, 2006, pp. 73-77.
[15]	P. L. Kempster, H. R.Van Vliet and A. Kuhn, “The Need for Guidelines to Bridge the Gap between Drinking – Water Quality and That Which Is Practically Available and Acceptable Water,” Water SA, Vol. 23, No. 2, 1997, pp. 163-167.
[16]	S. Dipak and D. Arti, “Assessment and Treatment of Municipal Wastewater of Indore City of India,” Archives of Applied Science Research, Vol. 3, No. 1, 2011, pp. 450-461.http://scholarsresearchlibrary.com/archive.html
[17]	C. M. A. Ademoroti, “Environmental Chemistry and Toxicology,” Foludex Press Ltd., Ibadan, 1996, pp. 134-146.
[18]	P. S. Burgoo, “Performance of Subsurface Flow Wetlands with Batch-Load and Continuous-Flow Conditions,” Water Environment Research, Washington DC, 1995.
[19]	A. O. Babatunde, Y. Q. Zhao, M. O’Neill and B. O’Sullivan, “Constructed Wetlands for Environmental Pollution Control: A Review of Developments, Research and Practice in Ireland,” Environment International, Vol. 34, No. 1, 2008, pp. 116-126. http://dx.doi.org/10.1016/j.envint.2007.06.013
[20]	W. T. Stringfellow, J. S. Hanlon, S. E. Borglin and N. W. T. Quinn, “Comparison of Wetland and Agriculture Drainage as Sources of Biochemical Oxygen Demand to the Sao Joaquin River, California,” Agricultural Water Management, Vol. 95, No. 5, 2008, pp. 527-538. http://dx.doi.org/10.1016/j.agwat.2007.12.007
[21]	R. H. Kadlec and R. L. Knight, “Treatment Wetlands,” 1st Edition, CRC Press, Boca Raton, 1996.
[22]	FEPA, “Effluent Limitation Guidelines for Discharge of Pollutants in Bodies of Water in Nigeria,” Federal Environmental Protection Agency, Nigeria, 1991.