114 requirements. This means that electricity must be purchased, leading to reduced profitability. By mixing in other materials (co-fermentation), the production of biogas can be increased. In this case, ECOFERM! could actually become a supplier of electricity. The business-economic evaluation shows that the ECOFERM! concept is feasible in principle. Taking account of fluctuations in rates and prices, the option involving manure treatment and co-fermentation could yield a modest profit at current market prices. Follow-up steps The next step is to work out the concept on a practical scale. This need not immediately be a full-scale pilot in the form sketched above; smaller-scale and simpler options that require fewer investments can also produce relevant experiences and lessons for taking the concept forward. One option is to place a (hybrid) algae cultivation facility at an existing fermentation installation. The algae produced in this way can probably not be used as animal feed, but can be processed into other products. Another option is to construct an algae pond at an existing pig farm. In this case, the manure will be separated on the farm itself, but digested and fermented elsewhere. The digestate will be sterilized and transported back to the farm for use as feed for the algae. In this way, the pigs’ body heat and the ventilation air from the stalls can also be used for the cultivation of algae in the bioreactor. This will then basically act as a biological purification installation for the stall air. Our main purpose here is to set in motion a development that leads towards sustainable pig farming, with the ECOFERM! concept serving as a source of inspiration and guideline for the more efficient utilization and closing of cycles: a promising perspective for a sector facing stern challenges! Pagina 122
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