The Digestate Problem

Traditionally, anaerobic digestion (AD) plants were designed with this idea in mind: take a waste water stream containing organic components and convert as much as possible of the organics into biogas. This way, the waste water is removed of undesired components and at the same time biogas is obtained as a renewable enegy source. A classical example is the use of digesters in municipal waste water treatment sites.

In recent years, the AD industry has changed considerably now that AD plants are not only found within waste water treatment sites. Think of agricultural AD sites or particular industries that clean up there own waste water using an onsite AD plant. All these AD sites produce an effluent that needs to be managed: Digestate. Next to biogas, digestate can be seen as an added value product as it contains nutrients that can be used for fertilization. But what to do with the digestate if there is no local use for it? Transport it to a waste water treatment plant or waste handler? What if these treatment site are remote? What to do with the digestate that contains animal by products? Is pasteurization needed? How can we maximize on the nutrients value contained in the digestate?

In many cases, local methods need to be applied for digestate management to avoid costs for removing it off site and/or pay third parties. explains a series of technologies for digestate management that were developed by HRS Heat Exchangers, a multinational company dedicated to providing state of the art technology for heat transfer and thermal applications. Click on each technology below to find out more:

Digestate Evaporator Scotland Digestate Pasteurization  Other Technologies