Use of recovered yeast and grain residues from pot-ale in the construction of a sheep pellet

行业数据显示，绵羊饲料价格已从250英镑/吨（2月21日）上涨至350英镑/吨（1月23日）。这意味着饲料价格在不到2年的时间内上涨了40%。这一价格上涨不得不被工业吸收，并转嫁给消费者，酿酒厂的副产品（麦芽糖浆、酵母渣和酒糟）历来被用作牛饲料。不幸的是，高铜含量使这些产品不适合绵羊食用，因为它们对铜不耐受。酵母和细粒残渣约占蒸馏过程中产生的主要液体副产品的1-2%。据估计，每年有多达40，000吨来自苏格兰蒸馏器的这些残留物被倾倒到陆地或海洋。如果再加上英国生物乙醇工厂的产量，每年可生产20万吨新材料。该项目旨在利用酿酒厂废水中的酵母残渣生产低铜含量的颗粒。使用创新的水力旋流过滤器可以确保目前被视为废物的细小酵母颗粒被捕获，而不会产生任何铜积累。该技术能够提取3微米大小的材料。该项目旨在捕获这些残留物，并将其与现有谷物结合联合收割机，以生产营养和可持续的羊颗粒。该项目将受益于苏格兰农村学院（SRUC）的Jos Houdijk教授的投入。他是英国公认的动物营养专家。他最近的工作重点是开发动物饲料的大豆替代品。酵母是一种极好的蛋白质来源，有可能用作大豆替代品。英国进口约300万吨大豆，其中90%用于动物饲料。据估计，英国约三分之二的进口大豆来自巴西。在某些情况下，这种大豆生产导致了森林砍伐。巴西大豆的碳成本估计为0.77吨二氧化碳/吨。因此，利用20万吨酵母残渣每年将节省15.4万吨二氧化碳。因此，减少对进口大豆的依赖可以帮助英国农业实现净零目标。

Industry data has revealed that sheep feed prices have increased from £250/tonne (Feb 21) to £350/tonne (Jan 23).This represents a 40% increase in feed prices in less than 2 years. This price increase has had to be absorbed by the industry and passed on to the consumer.Distillery co-products (pot-ale syrup, yeast residues and draff) have historically been used as cattle feed. Unfortunately the high copper content has made these products unsuitable for sheep as they are copper intolerant.Yeast and fine grain residues represent around 1-2% of the volume of pot-ale, which is the main liquid co-product arising from the distillation process. It is estimated that up to 40,000 tonnes of these residues arising from Scottish distillers are dumped, either to land or sea, each year. If output from UK bioethanol plants was added to this then the total amount of new material created could be up to 200,000 tonnes per annum.This project seeks to produce a low copper content pellet using yeast residues from distillery effluent.The use of innovate hydrocyclonic filters can ensure that the fine yeast particles, which are currently treated as a waste, can now be captured, without any copper accumulation. The technology has the capacity to extract material down to a size of 3 microns. This project seeks to capture these residues and combine them with existing grains to produce a nutritional and sustainable sheep pellet.The project will benefit from the input of Professor Jos Houdijk at Scottish Rural College (SRUC). He is a UK recognised expert in animal nutrition. His recent work has had a particular focus on developing soya alternatives for animal feed.Yeast is an excellent source of protein and could potentially be used as a soya substitute.The UK imports around 3,000,000 tonnes of soya , 90% of which goes into animal feed. It estimated that around two-thirds of UK imported soya comes from Brazil . In some cases this soya production has lead to deforestation. The carbon cost of Brazilian soya has been estimated to be 0.77tCO2/tonne. Harnessing 200,000 tonnes of yeast residues would therefore save 154,000 tonnes of carbon dioxide per annum.Reduction in reliance on imported soya could therefore assist UK farming with its net zero ambitions.