ISSUE FOCUS FEED & ADDITIVE MAGAZINE October 2022 61 materials. Though this is a big volume, a significant amount of nutritional and digestible by-products continues to be used for energy production. In light of today’s volatile energy markets, allocating by-products toward energy production might seem a suitable purpose. But it also is important to keep in mind the food waste framework where reusing materials has priority over recovery (Figure 1). Safety is always a top priority across the food product chain and reusing by-products within the food-to-feed chain often comes with microbial or regulatory challenges that must be addressed. New opportunities to leverage circularity keep being developed. A collaboration between Noblesse Proteins BV in the Netherlands, Looop and Selko Feed Additives offers a good example. The initiative diverted a by-product from Noblesse from biogas production towards feed ingredients, by implementing effective feed safety and shelf-life solutions. Edwin Huisken, Product developer at Noblesse mentions: ‘For Noblesse, it is important to make all incoming proteins available to the feed market rather than supplying them to the bio-energy industry’. In running various dose-response tests with preservatives, Noblesse selected Selko Revalet Super to provide the most cost-effective and broad-spectrum results (Figure 2). ‘With Selko Revalet Super, we found a high efficacy when applied in lower dosages. The product helps to preserve the nutritional value of our by-products,’ Huisken added. Figure 1. Food waste framework. Source: European commission. Figure 2. Dose response testing confirmed the most cost-effective solution. After day 7 the control sample was deemed unfit for feeding due to pungent smell, indicating complete microbial wastage. Therefore, it was taken out of the study.
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