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PC 3.09 – Wastewater Treatment

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When wastewater from coffee processing is treated, the traditional approach is to pour it into a pond around 2 meters deep and leave the water to slowly percolate into the soil. The low pH of pond water can be neutralised by the addition of talc (a clay mineral). The trouble with this simple system is that the rainy season, which usually follows the harvest, can cause ponds to overflow, causing the contaminants to spill into waterways.

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