Pollution menacing Lake Victoria: Quantification of point sources around Jinja Town, Uganda

 

 

Hannington W Oguttu^I; Fred WB Bugenyi^II; Heinz Leuenberger^III; Markus Wolf^IV; Reinhard Bachofen^V

^IFisheries Resources Research Institute, FIRRI, Jinja, PO Box 343, Jinja, Uganda
^IIMakerere University, Department of Zoology, PO Box 7062, Kampala, Uganda
^IIIVNCPC, Institute of Environmental Science and Technology, Hanoi University of Technology, Hanoi, Vietnam
^IVUniversity of Applied Sciences Basel, Institute of Environmental Technology, St. Jakobsstr. 84, CH-4132 Muttenz, Switzerland
^VUniversity of Zurich, Institute of Plant Biology, Zollikerstr. 107, CH-8008 Zurich, Switzerland

Correspondence

 

 

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ABSTRACT

Lake Victoria is Africa's largest tropical freshwater lake, important as a source of drinking water and as a source of food for the population in the surrounding region. Due to increased human activities in agriculture and industry during the past decades a continuously increasing inflow of agricultural runoff has been observed, and lately there have also been increased discharges of municipal effluents and industrial wastewater into Lake Victoria. This paper summarises the results of a one-year (1997 to 1998) environmental and ecological study of industrial wastewater point sources in the Jinja (Uganda) catchment area. Main industries concern food processing, textile, leather and paper production and metallurgy. One fish- filleting factory showed the highest annual nutrient loads with 0.13 t NO₃-N, 0.20 t NH₄-N and 0.77 t PO₄-P, while another disposed of annual loads that amounted to 0.10 t NH₄-N and 0.49 t PO₄-P. From food-processing industries, the highest annual load of organic matter (COD) discharged to the lake amounted to 36.8 t. A tannery in Jinja released effluent with an extremely high mean concentration of the very toxic chromium+⁶ of 264 mg-t^-1, which results in an estimated annual load of 2.2 t of Cr+⁶. Concentrations of nitrogen and phosphorus from fish-filleting industries and chromium+⁶ from the tannery were far above the allowed effluent limits in Uganda, leading to enhanced eutrophication and bioaccumulation of Cr⁺⁶ in Napoleon Gulf, Lake Victoria.
The study provides information on point sources of effluent derived from Jinja's industrial sector in an effort to force resource users to move towards a more sustainable pattern of environmental management. The most appropriate way to reduce the ongoing eutrophication and pollution of Lake Victoria would be to reduce the releases of nitrogen, phosphorus, organic compounds and chromium into Napoleon Gulf by on-site pretreatment, so that they remain within non-critical levels. Industries must be required to monitor their effluents before these are discharged into Kirinya National Water and Sewerage Corporation oxidation ponds and finally into Kirinya West urban wetlands.

Keywords: industrial pollution, point sources, heavy metals, potential loads, hot spots, Lake Victoria, on-site pretreatment

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References

BALIRWA JS (2001) From vegetation to fish: structural aspects and related components of lakeshore wetlands in Lake Victoria. Paper presented at the LVEMP Conference Kisumu, Kenya.         [ Links ]

BOOTSMA HA and HECKY RE (2003) A comparative introduction to the biology and limnology of the African Great Lakes. J. Great Lakes Res. 29 (Suppl.2) 3-18.         [ Links ]

BUGENYI FWB and BALIRWA JS (1989) Human intervention in the natural process of the Lake Victoria Ecosystem, the Problem. In: Salanki J and Heredek S (eds.) Conservation and Management of Lakes. 311-340.         [ Links ]

BYAMUKAMA D, KANSIIME F, MACH RL and FARNLEITNER AH (2000) Determination of Escherichia coli contamination with Chromocult coliform agar showed a high level of discrimination efficiency for differing fecal pollution levels in tropical waters of Kampala, Uganda. Appl. Environ. Microbiol. 66 (2) 864-868.         [ Links ]

CAMPELL LM, HECKY RE and WANDERA SB (2003a) Stable isotope analyses of food web structure and fish diet in Napoleon and Winam Gulfs, Lake Victoria, East Africa. J. Great Lakes Res. 29 (Suppl.2) 243-257.         [ Links ]

CAMPELL LM, HECKY RE, MUGGIDE R, DIXON DG and RAM-LAL PS (2003b) Variation and distribution of total mercury in water, sediment and soil from northern Lake Victoria, East Africa. Biogeochem. 65 195-211.         [ Links ]

CHAPMAN D (1992) Water Quality Assessments, A Guide to the Use of Biota, Sediments and Water in Environmental Monitoring. Chapman and Hall, New York. 585 pp.         [ Links ]

DENNY P (1988) Assessing of Uganda's Wetlands with Recommendations for Their Management. United Nations Environment Program, Nairobi, Kenya.         [ Links ]

DENNY P (2001) Research, capacity-building and empowerment for sustainable management of African wetland ecosystems. Hydrobiol. 458 (1-3) 21-31.         [ Links ]

HARRO Z (1996) A Systematic Assessment of Water Pollution in Lake Victoria. M.Sc. Thesis, Eindhoven University of Technology, Eindhoven.         [ Links ]

HECKY RE (1993) The eutrophication of Lake Victoria. Verh. Int. Verein. Limnol. 25 39-48.         [ Links ]

HECKY RE and BUGENYI FWB (1992) Hydrology and chemistry of African Great Lakes and water quality issues. Problems and solutions. Verh. Int. Verein. Limnol. 23 45-54.         [ Links ]

HECKY RE, BUGENYI FWB, OCHUMBA P, TALLING JF, MUDIGGE R, GOPHEN M and KAUFMAN L (1994) Deoxygenation of the deep water of Lake Victoria, East Africa. Limnol. Oceanogr. 39 23-36.         [ Links ]

JINJA MUNICIPALITY (1997) State of Environment Report for Jinja Municipality. Kampala Development Consultants Int.-Ldt.         [ Links ]

KAGGWA RC, MULALELO CI, DENNY P and OKURUT TO (2001) The impact of alum discharges on a natural tropical wetland in Uganda. Water Res. 35 (3) 795-807.         [ Links ]

KANSIIME F and NALUBEGA M (2000) Wastewater Treatment by a Natural Wetland: The Nakivubo Swamp, Uganda - Processes and Implications. Balkema, Rotterdam, NL. 316 pp.         [ Links ]

KANSIIME F, KATEYO E and OKOT-OKUMU J (1995) Effects of Pollution of Inner Murchison Bay (Lake Victoria, Uganda) on the Distribution and Abundance of Plankton. NUFU report, Faculty of Science, Makerere University, Kampala, Uganda. 30 pp.         [ Links ]

KIRAGURA D and NEVEJAN N (1996) Identification of Pollution Sources in the Kenyan Part of the Lake Victoria Catchment Area. Kenya-Belgium Joint Project in: Freshwater Ecology. Kenya Marine Fisheries Research Institute, Kisumu and Laboratory of General Botany and Nature Management (APNA), Brussels, Belgium. 5 38-50.         [ Links ]

KOLLER M and KUNZ A (1997) Wetland survey. FIRRI-Swiss Eco-tone Project, Jinja, Uganda. Report of a GPS Survey in Three Wetlands. ETHZ, Swiss Federal Institute of Technology Zurich and Fisheries Research Institute in Jinja, Uganda        [ Links ]

LINDENSCHMIDT KE, SUHR M, MAGUMBA MK, HECKY RE and BUGENYI FWB (1998) Loading of solute and suspended solids from rural catchment areas flowing into Lake Victoria in Uganda. Water Res. 32 (9) 2776-2786.         [ Links ]

MUGIDDE R (1993) The increase of phytoplankton productivity and biomass in Lake Victoria (Uganda). Int. Assess. Theor. Appl. Limnol. Proc. 25 846-849.         [ Links ]

MUGIDDE R, (2001) Nutrient Status and Planktonic Nitrogen Fixation in Lake Victoria, Africa. Ph.D. Thesis. University of Waterloo, Ontario, Canada.         [ Links ]

MWAMBURI J and OLOO FN (1997) The Distribution and concentration levels of trace metals in water and sediments of Lake Victoria, Kenya. Afr. J. Trop. Hydrobiol. Fish. 7 37-48.         [ Links ]

MWANUZI F, AALDERINK H and MDAMO L (2003) Simulation of pollution buffering capacity of wetlands fringing the Lake Victoria. Environ. Int. 29 95-103.         [ Links ]

NEMA (1995) The National Environment Management Authority, Statute, Supplement No. 3. Uganda, Statutes supplement to the Uganda Gazette Volume LXXXVIII No. 21 dated 19^th May 1995. Sections 20-38.         [ Links ]

NEMA (1999) The National Environment Regulations, (Standards for Discharge of Effluent into Water or on Land). Statutory Instruments Supplement to the Uganda Gazette Volume XCII No. 7 dated 12^th February. 12-14.         [ Links ]

NTIBA MJ, KUDOJA WM and KIREMA-MUKASA CT (2000) Problems related to water: the situation in Lake Victoria basin, East Africa. Boll. Soc. Ticinese Sci. Nat. 88 109-116.         [ Links ]

ODADA EO, OLAGO DO, KULINDWA K, NTIBA M and WANDIGA S (2004) Mitigation of environmental problems in Lake Victoria, East Africa: Causal chain and policy options analyses. Ambio 33 (1-2) 13-23.         [ Links ]

OGWANG JA and MOLO R (2004) Threat of water hyacinth resurgence after a successful biocontrol program: Biocontrol. Sci. Technol. 6 623-626.         [ Links ]

ORACH-MEZA FL (2001) Lake Victoria Environmental Management Project, Initiative in the management of trans-boundary waters. Proc. Int. Conf. Freshwater. Bonn, Germany. Available at www.lvemp.org/L_Publications/Uganda/Dr%20Orach%20-%20Bonn.htm.         [ Links ]

SAAD MAH (1987) Limnological studies on the Nozha Hydrodrome, Egypt, with special reference to the problems of pollution. Sci. Total Environ. 67 195-214.         [ Links ]

SAAD MAH, AMUZU AT, BINEY C, CALAMARI D, IMEVBORE AM, NAEVE H and OCHUMBA PBO (1990) Scientific Bases for Pollution Control in African Inland Waters (Domestic and industrial organic loads). FAO Fisheries Report 437. 24 pp.         [ Links ]

SCHEREN PAGM, ZANTING HA and LEMMENS AMC (2000) Estimation of water pollution sources in Lake Victoria, East Africa: Application and elaboration of the rapid assessment methodology. J. Environ. Manage. 58 235-248.         [ Links ]

STANDARD METHODS (1998) Standard Methods for the Examination of Water and Wastewater. Clesceri LS, Greenberg AE, Eaton AD (eds.) (20^th edn.) American Public Health Association (APHA) Washington DC.         [ Links ]

UN-HABITAT (2004) Project proposal: Lake Victoria region water and sanitation initiative, available at http://temp.itpreneurs.com/lake%20victoria%20initiative.pdf        [ Links ]

VERSCHUREN D, JOHNSON TC, KLING HJ, EDINGTON DN, LEAVITT R, BROWN ET, TALBOT MR and HECKY RE (2002) History and timing of human impact on Lake Victoria, East Africa. Proc. R. Soc. Lond. B 269 289-294.         [ Links ]

WILLIAMS GM (1991) Techniques and Fieldwork in Ecology. Bell and Hyman, London.         [ Links ]

WHO (1984) World Health Organisation. Drinking Water Guidelines. Available at www.who.int/water_sanitation_health/dwg/gdwq3/en/index.html        [ Links ]

 

 

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E-mail: bachofen@botinst.unizh.ch

Received 20 June 2006;
Accepted in revised form 29 November2007.