Construction update: Sep 2016

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Some of the waste has to be inoculated by hand

The inoculation phase is almost finished, which means: the digester is filled with a mix of organic waste from public toilets, slaughterhouses and food markets from Ashaiman. This waste produces biogas, and the amount of biogas in the green balloon has reached a level that is now high enough to produce electricity.

Together with the power company technicians, we have started to connect the brand new CHP (combined heat power generator) that will transform the biogas from the balloon into electricity which we will supply to the grid. The testing phase of the CHP takes a couple of weeks. After that Safi Sana will be an official supplier of renewable energy to the ECG (Electricity Company of Ghana) grid.

The drying beds have now been built. These are walled plots with a porous floor. When the digestate (digested organic waste) is being pumped out of the digester into the drying beds, the liquid part of it will sink down into the floor while the dry matter stays in the drying beds. This process takes some time, up to a couple of months. When it’s dry enough, we put it in the mixing pits for co-composting. After that it is ready for use by local farmers, and also by Safi Sana, in our greenhouses.
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Drying beds, and sand for the porous floor

To complete the circular system that the Safi Sana model consists of, we re-use the irrigation water (no pathogens and full of nutrients!) that we collect in the drying beds, to grow vegetable seedlings. For this purpose, we just started the building of our 390m2 greenhouse, and we will feed the seedlings with our home grown organic fertilizer. In consultation with local farmers and market queens, we will decide what kind of seedlings we will grow.

 

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