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HomeCircular EconomyRhombus Concrete launches Concrete Recycling Plant

Rhombus Concrete launches Concrete Recycling Plant

Nairobi, June 11, 2021: Kenya’s leading ready-mix concrete producer Rhombus Concrete announced that the company has invested in a state-of-the-art concrete recycling plant from Bibko Systems, Germany. This is the first recycling plant of its kind in Kenya and can recycle over 20m³ (cubic meters) of concrete per hour.

The construction industry is notorious for releasing a lot of waste causing environmental pollution. Cement emits dust and a lot of water gets wasted. During concreting, especially traditional mixing, substantial amounts water with cement and other aggregates will escape into the ground causing environmental hazards. Importantly to note too is that Global cement production is responsible for about 8 percent of the world’s carbon emissions.

Kenya’s cement producers and dealers are increasingly venturing into ready-mix concrete delivery business to meet the growing need for the solution among developers putting up large-scale constructions. However, this ready mix concrete industry is leaving behind a massive environmental impact especially, whenever concrete waste is washed off the delivery trucks and the disposal of excess concrete slurry from the mixing plant. Concrete slurry waste (CSW) generated from ready-mixed concrete plants during concrete production is classified as a corrosive hazardous material. If it is disposed of at landfills or dumpsites, it would cause detrimental effects for our surrounding environment and ecosystems due to its high pH value as well as heavy metal contamination and accumulation.

How the machine works:

Rhombus has now changed all that. When the trucks return from delivery, their tanks-which contain waste that has some cement and fine aggregates (ballast and sand) – are washed with at least 200 litres of water. The waste is then poured into the recycling machine which separates each component. The water with cement will go into collection tanks and recycled into the batching plants while the fine aggregates are separated and recycled back again into their original stock piles for re-use.

“If we take an average monthly production of about 20,000m³ of concrete, the savings from this new recycling plant are enormous. On water alone, we recover over 500,000 litres of water that would have gone to waste per month. In 5 months, that water is enough to fill an Olympic size swimming pool”, says Solomon Wangai, Managing Director of Rhombus Concrete. “Using the same activity level of 20,000m³ monthly concrete production, we also save over 300 tons of ballast and sand that would have otherwise gone to waste. Besides the commercial savings made from this waste, the biggest winner – and the main motivation for this investment – is the environment” Solomon adds. 

With the new plant, Rhombus will have minimal waste leaking into the environment as the company commits to continue investing in cutting-edge technology and maintaining leadership in innovation, quality assurance and environmental sustainability in Kenya’s growing construction industry.


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