An innovative new technique for improved separation of liquid digestate to concentrate & retain valuable nutrients and reduce costs of liquor processing through sustainable reed beds - Ultraflocc

一种改进液体沼渣浓缩分离的创新技术

• 批准号: 710827
• 金额: $ 12.61万
• 依托单位: BARFOOTS OF BOTLEY LIMITED
• 依托单位国家: 英国
• 项目类别: GRD Proof of Concept
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=710827
• 关键词: innovative; new; technique; improved; separation

Anaerobic digestion (AD) of biowaste is becoming an increasingly popular means ofrecycling unwanted materials to generate both energy (in the form of biogas/electricity) &reusable materials (fertilisers). In the UK, the number of AD plants has increased dramaticallysince 2013, from 106 to 246 plants. However a major problem faced by entire sector isdealing with the large amounts of liquid digestate produced as a by-product of the process;80% of the input feedstock is typically collected as liquor. Control & handling of the digestateliquor is regulated, so dealing with the large volumes (~40,000 tonnes per average size plant)can be extremely difficult and costly. Ideally, reed beds would be used, but are not viable dueto the high solid content that tend to choke the reed beds, along with the loss of the valuablenutrients the liquor contains. Consequently, the most common disposal method is to transportthe liquor to farms where it is spread directly as a fertiliser at considerable cost. Landapplication of fertiliser can also lead to run-off & leaching, creating a risk of eutrophication.The ideal solution would be to lower the suspended solid digestate content of the liquor (to 5wt% max.) to generate a digestate liquid which could subsequently be processed using reedbeds; dramatically reducing transport costs & enabling recovery of valuable nutrients (eg.nitrogen & phosphorus) in a solids concentrate.Our innovative new concept will accelerate the flocculation of particles & encouragesedimentation. It is envisaged that the development of the new technology will:• Reduce costs of dealing with digestate liquor; lower capital & operating costs vs SOA• Reduce solid content of digestate liquor from 10% to less than 5%• Facilitate release of liquor to reed beds – less solid content in liquor will reduce riskof blockage• Recover valuable nutrients (nitrogen & phosphorus) in a concentrated form

BioWaste的厌氧消化（AD）正在成为一种越来越流行的方法，用于回收不需要的材料，以产生能量（以沼气/电力）和可重复使用的材料（肥料）（肥料）。在英国，自2013年以来，广告植物的数量已从106家工厂急剧增加。然而，整个部门面临的一个主要问题是，作为该过程的副产品产生的大量液体消化液；输入原料的80％通常被收集为液体。对消化液体的控制和处理受到调节，因此处理大量量（每平均尺寸约40,000吨）可能非常困难且昂贵。理想情况下，将使用芦苇床，但不是viato，倾向于抑制芦苇床的高固体含量，以及液体含有液体含量的损失。因此，最常见的处置方法是将Liquidul运送到农场，在该农场以相当大的成本直接作为肥料传播。肥料的土地应用也可以导致径流和离开，从而产生富营养化的风险。理想的解决方案是降低液体的悬浮固体消化含量（最大5wt％最大），以生成消化液体，随后可以使用芦苇处理。大幅降低运输成本并使固体浓缩物中有价值的养分（例如硝基和磷）的回收。我们的创新新概念将加速颗粒的絮凝和鼓励。可以预见，新技术的开发将：•降低处理消化液的成本；降低资本和运营成本与SOA•将消化液体的固体含量从10％降低到小于5％•促进液体释放到芦苇床 - 液体中较少的固体含量将降低阻塞的风险•恢复有价值的营养素（氮和磷）以浓缩形式降低。