Constructed wetlands for phytoremediation of industrial wastewater in Addis Ababa, Ethiopia
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Brewery industries generate large amounts of wastewater rich in organic matter originating from the brewing process, and they are among the major polluting industries. This study aimed to assess the phytoremediation of brewery wastewater using horizontal subsurface flow constructed wetlands (HSFCWs) vegetated with Typha latifolia and Pennisetum purpureum for organics removal and plant growth analysis. Six parallel pilot-scale HSFCWs were constructed and operated to assess potential of treating wastewater sourced from St. George brewery factory located in Addis Ababa, Ethiopia. Three units were planted with T. latifolia and the other three with P. purpureum with one control without plants for each species. Primarily settled wastewater was fed evenly to them by gravity. Wastewater quality, plant growth analysis and system efficiency were observed during the experiment following standard methods. Both plants grew and established well, however, T. latifolia had more biomass and vigorous growth and showed good phytoremedial capacity to remove organic pollutants. Average removal efficiencies for BOD5 and COD were significant (p < 0.05), up to 87% (inlet BOD5 of 748–1642 mg l−1) and up to 81% (inlet COD of 835–2602 mg l−1) and T. latifolia slightly outperformed P. purpureum. Estimated biomass of significant (p < 0.05) value (0.61–0.86 kg DW m−2) was produced. HSFCWs are green and environmentally sustainable technology that offers promising alternative wastewater treatment method in developing countries of tropical climate due to its low-tech nature. Integrating treatment and biomass production needs further improvement.
KeywordsBiomass Brewery wastewater Constructed wetlands Organics removal Phytoremediation Ethiopia
The authors thank the Ethiopian Institute of Water Resources, Addis Ababa University (AAU) for supervising the financial support provided by the United States Agency for International Development (USAID) under a USAID/HED funded grant in the Africa-US Higher Education Initiative (Grant HED 052-9740-ETH-11-01). The authors are also thankful to Addis Ababa Science and Technology University for material support and allowing developing the pilot-scale hydroponic treatment system on the campus. We also acknowledge the University of Connecticut for the providing of access to its electronic library and St. George Brewery to access brewery wastewater.
Compliance with ethical standards
Conflict of interest
There is no conflict of interest among the Authors.
- 1.United Nations Environment Program (UNEP) (2008) Africa Review Report on Sustainable Consumption and Production. UNEP, Addis AbabaGoogle Scholar
- 3.Nebyou S (2011) Technical efficiency analysis of the Ethiopian brewery industry. Dissertation, Addis Ababa UniversityGoogle Scholar
- 9.Dipu S et al (2010) Phytoremediation of dairy effluent by constructed wetland technology using wetland macrophytes. Glob J Environ Res 4(2):90–100Google Scholar
- 10.Mwangi SW et al (2014) The efficacy of a tropical constructed wetland for treating wastewater during the wet season: the Kenyan experience. J Environ Earth Sci 4(15):66–73Google Scholar
- 13.Brix H (1994) Functions of macrophytes in constructed wetlands. Water Sci Technol 29(4):71–78Google Scholar
- 20.Vipat V, Singh U, Billore S (2008) Efficacy of rootzone technology for treatment of domestic wastewater: field scale study of a pilot project in Bhopal.(MP), India. In: The 12th world lake conferenceGoogle Scholar
- 28.Aslam MM, Sarfraz H, Baig M (2010) Removal of metals from the refinery wastewater through vertical flow constructed wetlands. Int J Agric Biol 12(5):796–798Google Scholar
- 34.American Public Health Association (APHA) (1999) Standard methods for the examination of water and wastewater, 20th edn. American Public Health Association, WashingtonGoogle Scholar
- 38.Driessen W, Vereijken T (2003) Recent developments in biological treatment of brewery effluent. In: Proceedings 9th brewing convention. Victoria Falls, ZambiaGoogle Scholar
- 43.United States Environmental Protection Agency (USEPA) (2000) Constructed wetlands treatment of municipal wastewaters. United States Environmental Protection Agency, EPA/625/R-99/010, U.S. Environmental Protection Agency. CincinnatiGoogle Scholar
- 49.EPA (2003) Ethiopian national provisional industrial emission standard. Addis AbabaGoogle Scholar
- 53.Maddison M (2008) Dynamics of phytomass production and nutrient standing stock of cattail and its use for environment-friendly construction. Dissertation, University of Tartu, EstoniaGoogle Scholar
- 54.Sudarsan J, Thattai D, Das A (2012) Phyto-remediation of dairy-waste water using constructed wetland. Int J of Pharmceut Biol Sci 3(3):745–755Google Scholar