CHALLENGE

Integrated Agro-industrial Wastewater treatment and Value Addition Innovations

In the eastern Africa region agriculture and industrial processing are viewed as the main drivers of economic growth. However these sectors are associated with environmental degradation due to the unsustainable utilization of land and water resources, and discharge of untreated or partially treated waste water to the environment and greenhouse gas emissions, and consequently climate change. There is a growing interest and search for alternative energy sources to fossilized fuel that are cheaper and environmentally friendlier.

The current conventional agro-process treatment processes in the region tend to separately focus on reducing pollution load or bio-gas production. Therefore these treatment processes do not integrate pollution reduction, energy and nutrient recovery from agro-process waste water to contribute to the ever increasing energy demands but at the same time reduce GHG emissions. Furthermore, these waste water treatment technologies often do not meet national discharge standards to protect the human population and the environment.

Technologies and processes that not only treat waste water from industrial activities from slaughterhouses, abattoirs and brewing for example, but also add value along the waste treatment chain are necessary strategies to compliment global climate change mitigation efforts.

This project focuses on developing and testing technologies for integrating biogas production and water and nutrient recycling from slaughterhouses, banana wine production and tanning processes in Uganda, Tanzania and Ethiopia respectively in partnership with the industrial partners.

Integrated processes that combine pollution reduction, energy and nutrient recovery from agro-process waste water.

  1. In Uganda initial testing of the pilot digester system receiving slaughterhouse wastewater at the Kampala City abattoir is complete and quantity and quality of biogas currently stands at 8-13 m3/day and 61% methane respectively. Optimization is ongoing.
  1. In Tanzania construction of the wastewater treatment facility that includes bar screen, transfer sump, equalization tank, primary clarifier and buffer tank and installation of the biogas digester and the gas holder foundations is complete and is undergoing optimization.
  1. In Ethiopia preliminary data for the pilot scale two stage anaerobic-aerobic digester and constructed wetlands has been completed and is undergoing optimization.
  1. Feasibility and techno-economic analysis and intellectual property audit has been conducted for the three technologies.

Integrated Agro-industrial Waste water Treatment and Value Addition Innovations

Once the pilot-testing is optimized and feasibility and techno-economic analysis and business plan for the technologies, the next step will be to disseminate and/or commercialize the innovations to industrial stakeholders in the region generating similar waste. This will be followed by up-scaling of technologies in partnership with interested industrial partners to fully manage their waste and convert it into value added products that not only impact their profitability but also solve an environmental problem.

Integrated-Agro industrial Wastewaters veges

“Kilifi Plantations Limited fully supports the partnership with project 4 as it offers opportunities for more effi cient land use while fi nding alternative use of sisal waste in an environmentally sustainable way. The waste generated from the sisal decorticating process is used to generate bio-gas. The biogas generated is converted to electricity to augment the energy needs for the farm. The growing and production of the mushrooms is envisaged to add another revenue stream to our operations and create more employment opportunities.”

Betty Bundotich Banana Investments Limited

Participating countries, institutions and organizations

Research Institutions

  1. University of Dar es Salaam, Tanzania
  2. Makerere University, Uganda
  3. Addis Ababa University, Ethiopia
  4. National University of Rwanda

Private sector partners

  1. Banana Investments Ltd, Tanzania
  2. Modjo Tannery Share Company, Ethiopia
  3. Kampala Abattoir, Uganda
  4. AKUT Burkard

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