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  • Volume 12, Issue 3

Application of up-flow anaerobic sludge blanket reactor integrated with constructed wetland for treatment of banana winery effluent

C. Paschal, L. Gastory, J. H. Y. Katima, K. N. Njau
Published August 2017, 12 (3) 667-674; DOI: 10.2166/wpt.2017.062
C. Paschal
The Nelson Mandela African Institution of Science and Technology, P.O. Box 447, Arusha, Tanzania
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L. Gastory
WWS Design and Development Co. Ltd, P.O. Box 77266, Dar es Salaam, Tanzania
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J. H. Y. Katima
University of Dar es Salaam, College of Engineering and Technology (COET), WSP & CW Research and Development Group, P.O. Box 35131, Dar es Salaam, Tanzania
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K. N. Njau
The Nelson Mandela African Institution of Science and Technology, P.O. Box 447, Arusha, TanzaniaCorresponding author. E-mail: karoli.njau@nm-aist.ac.tz
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Abstract

Agroprocessing constitutes sizeable industries in the Eastern Africa region discharging wastes into the environment. Proper management of industrial waste is perceived as expensive and enforcement of laws is weak. Generally, there is low awareness of environmental and socio-economic consequences of polluting the environment. The Banana Investment Limited (BIL) in Arusha Tanzania which produces banana wine from ripe bananas was discharging untreated wastewater into the environment. This project aimed at treating the BIL wastewater to meet environmental standards and recover nutrients, water and energy. The feeding wastewater to the up-flow anaerobic sludge blanket (UASB) with flow rate of 62.4 m3/d had concentrations (mg/L) of chemical oxygen demand (COD) (4,959.3 ± 388.7), BOD5 (1,453.7 ± 110.3), total suspended solids (TSS) (2,431.0 ± 190.5), NH4+ (7.2 ± 1.1), NO3− (23.4 ± 3.2), PO43− (5.12 ± 0.73), volatile fatty acid (0.60 ± 0.09), and Alkalinity (60.00 ± 8.98). After 17 months of operation the system achieved removal efficiencies (%) of COD (99.0), BOD5 (98.6), TSS (96.0), NO3− (88.7), PO43− (50.8). There was a net generation of NH4+ (387.8%) in the system. The biogas produced in the UASB is collected at a rate of 163 m3/d and is used in the boiler at BIL. The dried sludge and the treated water are used for irrigation. The study concluded that integrating the bio-digestion process with polishing stage for water, nutrient and energy recovery ensures compliance to environmental law and provides incentive to treat wastewater while also mitigating greenhouse gases.

  • constructed wetland
  • industrial wastewater
  • UASB
  • wastewater treatment
  • winery effluent
  • © IWA Publishing 2017
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Water Practice and Technology: 13 (1)
  Volume 12, Issue 3

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Application of up-flow anaerobic sludge blanket reactor integrated with constructed wetland for treatment of banana winery effluent
C. Paschal, L. Gastory, J. H. Y. Katima, K. N. Njau
Water Practice and Technology Aug 2017, 12 (3) 667-674; DOI: 10.2166/wpt.2017.062
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Application of up-flow anaerobic sludge blanket reactor integrated with constructed wetland for treatment of banana winery effluent
C. Paschal, L. Gastory, J. H. Y. Katima, K. N. Njau
Water Practice and Technology Aug 2017, 12 (3) 667-674; DOI: 10.2166/wpt.2017.062

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Keywords

constructed wetland
Industrial wastewater
UASB
Wastewater Treatment
winery effluent
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