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Meet Ghanaian Female Engineer Who Designed And Built Garri Processing Machine

Deborah Opandoh


Deborah Opandoh’s love for food, mathematics, and physics led her to pursue a degree in Agricultural Engineering at the Kwame Nkrumah University of Science and Technology in 2007.

That flair has its roots two steps backwards when she would come top in a WAEC-organised Mathematics competition for all Junior High Schools in the Western Region.

After serving as a teaching and research assistant upon completion of her bachelor’s degree, Deborah Opandoh decided to taste a master’s degree in Food and Post-harvest engineering at the same University.

Towards the end of the first year of the programme, she got the privilege to work with the Affordable Design and Entrepreneurship (ADE) group, where they went to rural areas to see how women processed food.

“We realised that most women who processed gari grated by hand, and this was dangerous, inefficient, very laborious and time-wasting.

“They also pressed with rocks which was very dangerous especially to their health as most had issues with their waist and some would need men to carry and turn over the sacs,” she said.


Deborah began working on the grating surfaces of the cassava grater for her Master’s.

After working with ADE and the Technology Consultancy Centre of KNUST, Deborah co-founded QueenTech Initiative, where she serves as Executive Director.

“It was a success and was deployed on the field. Since then, we have improved on the designs so many times based on customer feedback and now we are on the 18th grater design and for the press, this is the 4th,” she said.

Another feature which enables the grater to process cassava for foods like banku has now been added to the machine and it’s just a one-step process instead of the usual two.

“The mini cassava grater can process about 200 kilograms of cassava per hour. The contact parts are made of stainless steel or food-grade plastic.

“The grater is powered by a 0.75 horsepower electric motor so they don’t have to worry about energy consumption. It’s very efficient; 1400 rpm,” she added.

QueenTech has a collaboration with the Olin and Babson Colleges in the United States.

“Olin assists with the engineering aspect and Babson, the business aspect,” she said.

The cassava grater sells for 850 cedis if paid for upfront and 900 cedis if paid in instalments.

QueenTech has a microloan arrangement with the rural women where they make part payment and then monthly down payments for 6 months.

The mini cassava grater is helping people in over 30 rural communities.


Written by How Africa News

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