Projects: Freeze concentrationWaste2Taste – Roller drying 2.0 for algae- Convective Drying – Conductive Drying – Waste Recovery – Smart Sensoring – Spray Drying Droplets – Hydrodynamics – Heat Pumps –Low Energy Living Bacterial Food FormulationsRadio Multi Zone Drying-  Energy Efficient Milky Sprays- Process INtegrated HEat pump Drying (PINCHED)

Convective drying = spray drying / fluidised bed drying / radiofrequenced drying / microwave drying

Conductive or dielectric drying = Drum drying / vacuum drum drying / vortex drying / agitated thin film drying / refractance window drying

Freeze drying or Lyophilization

DRYING & DEWATERING  is an important processing unit step for industry. Various types of products require drying in their process, varying from vegetables, dairy products or paper and sewage. Drying is an energy intensive technology which is requiring 80 PJ a year (2013 NEVI). Especially in the food and paper industry it also is one of the most energy-consuming processes in the process industry. The climate agreement therefore sets the goal for jointly investing in process efficiency via joint research through joint programs.

Our mission is to work together towards a thriving, circular industry to reduce greenhouse gas emissions with the required tonnage in 2030 and to share our knowledge. In the drying cluster we create a sustainable innovation program to reduce energy usage coupled to cost reduction and better and more sustainable product quality. Interaction between industry interest in supporting R&D in this important area and academia to carry out cost-effective R&D in a collaborative manner is key to the effective and rapid transfer of technology from R&D laboratories to industrial practice. We work according to the themes of Circular Economy, Drying Processes Digitization and Residual Heat Usage to identify mission driven innovation possibilities.

Drying is one of the most energy-intensive operations in the food industry and has big impact on the quality and properties of foods. This why there is interest in developing more energy efficient, mild drying technologies. The focus of this project is on understanding conductive drying processes, which are more energy efficient and may be mild when operated at reduced pressureNew activities are defined in accordance with the roadmap as established by the Cluster and the associated Drying community.


Vortex Chamber: the Proof of Concept and a design are developed for a compact, low investment spray drying technology in which the atomizing, drying/forming and separation processes are better controlled through the introduction centrifugal acceleration.

Thin film drying: We investigate operational parameters of different thin film technologies and analyse different samples. We collect information on the skin formation process and its relation to drying behaviour, powder properties and activity loss of a model component (e.g. enzyme) is being collected using in and off-line analytical tools. Publications:

Jun Qiu, Koen Kloosterboer, Yang Guo, Remko M. Boom, Maarten A.I. Schutyser (2018)  Conductive thin film drying kinetics relevant to drum drying.

Jun Qiu, Remko M. Boom & Maarten A. I. Schutyser (2018) Agitated thin-film drying of foods, Drying Technology

Multicomponent analysis of single droplet drying: Development and application of   kinetic models and analytical tools at the droplet scale will be used to gain mechanistic insight on how powder formation during spray drying is kinetically controlled.

Low Energy Living Bacterial Food Formulations: Research towards a novel and generic strategy that aims at drastic enhancement of robustness of beneficial bacteria during spray drying and subsequent storage. The strategy employs pulsed electroporation leading to reversible pore formation in the bacterial cell membrane.

Evaluation of low energy drying by novel nozzle concept: Research towards the application of a novel nozzle technology that has the advantage that the mean droplet diameter can be adjusted independently from the flow and pressure. More information on the technology can be found here.

Energy Efficient drying using Liquid Sorption (EELS): ISPT provides dissemination of the results of the possibilities to design a system based on liquid sorption drying including sorbent screening, techno-economical evaluation and system design.

FREEZECON: The overall objective is to demonstrate that freeze concentration can be an economically feasible bulk dewatering technology with intrinsic benefits in specific energy consumption and product quality. The project team expects to be able to reach this objective via the use of equipment already available for industrial refrigeration allowing for cost efficiency and quick scale. And by balancing between separation efficiency and bulk processing, using the temperature and pressure as degrees of freedom during crystallization on a heat exchanger surface.

GRIP: This project investigates how in line sensors can help improving product quality and efficiency in a number of industrial cases. Using a large consortium of end users, technology suppliers and active dissemination via the ISPT Innovation academy and NWGD we strive to enlarge the GRIP on drying. The digitization introduces a new vulnerability, for this reason the program tele vulnerability of agentschap telecom joined the consortium.

In April 2019, the Dutch Working Group Drying (NWGD) and ISPT organized a meeting on heat pumps in the drying process. Read more about the meeting here (Dutch only).

Electrification Dryers Inspires the Industry, read the Bulk Gids article here.

Algae Concentration& drying: ISPT, Phycom and Andritz Gouda are investigating a new mild efficient and hygienic way to dry algae. The newly designed process is particularly suited for viscous materials and leads to superior and constant product quality. These new industrial drying possibilities are brought to the market by Andritz Gouda in a new drum drying concept. The new concepts are described in a flyer describing the new possibilities.

Hygienic Cool Separation: Harvesting micro algae produces a lot of energy hence heat and causes a loss of quality and shelf life. As the product is meant to be used for the food industry a food grade hygienic product is needed under cool conditions. For more information on Cool Separation, click here.

Thin film Drying of Liquid Foodstuffs: Testing of a new type of Thin Film Dryers (TFD) for drying of food stuffs like sugars, proteins, dairy products as alternative technology for spray drying. The technology uses indirect heart and mechanical agitation to dry the dynamic film under controlled conditions of pressure, temperature, rotor speed and feed flow. The combination of short residence time, narrow residence time distribution, high turbulence and rapid surface renewal permits this TFD to handle sensitive products such as proteins, overcoming problems as degradation due to long residence times, surface fouling, and low heat transfer coefficients.

Waste2Taste projectThe aim of this project is to investigate the utilization of vegetable wastestreams to provide more sustainable and natural sources of vegetable flavour ingredients.

New activities are defined in accordance with the roadmap as established by the Cluster and the associated Drying community.


ISPT Day 2019, 19th November 2019, Venue Prodent Fabriek, Amersfoort

NWGD-symposium, 26th November 2019, Venue Hotel de Roskam, Rhenen

PARTNERSHIP with NWGD (Nederlandse Werkgroep Drogen)

The Dutch working society on drying (NWGD) stimulates the development and application of sustainable drying technology in the Netherlands by connecting drying experts via amongst others networking events. Drying experts of NWGD work amongst others in the process industry, with technology suppliers, with knowledge institutes or are independent consultants.

NWGD and ISPT work together on the joint ambition to innovate in the area of drying technology in the Netherlands. This cooperation is for example visible during the yearly NWGD symposium during which updates of the research projects within ISPT are presented to the NWGD community. For more information visit the NWGD-website.


Electrification Dryers Inspires the Industry, read the Bulk Gids article here.

Drying & Dewatering booklet, a more extensive guide on all activities within the Cluster.

Drying & Dewatering Academy, an online learning environment that was created within the ISPT project GRIP on dryers.



DR-20-03      Qui, Jun                 WUR            1-9-2014       28-2-2019
april 2019, succesful thesis defense

DR-20-04      Both, Eline              WUR            1-9-2014       31-3-2019
juli 2019, succesful thesis defense

DR-20-05      Ur Rahman, Umair  UTwente       1-5-2016       1-5-2018

DR-20-06      Vaesen, Evelien      WUR            1-10-2015     31-3-2020

DR-20-08      Vuist, Jan Eise        WUR            13-3-2017     13-3-2021

DR-20-10      Ur Rahman, Umair  UTwente       1-3-2018       31-12-2020

DR-20-10      Tourneur, Thomas UCLouvain   1-3-2018       31-12-2020

DR-20-11      Siccama, Joanna    WUR            1-7-2018       1-7-2022

DR-20-11      Pegiou, Irini            WUR            1-11-2018     1-11-2022

DR-20-13      Cristina Garcia Llamas, TU/e       1-9-2019       1-9-2023

DR-20-13      PhD, vacancy         TU/e             1-9-2019       1-9-2023

DR-20-14      Sanduni Patiraya, TU/e, TU/e      1-10-2019     1-10-2020

If you have a specific issue or project idea that would fit our mission-driven program in the Drying & Dewatering Cluster, and if you are interested in joining our open innovation Cluster(s) please contact Peter de Jong

Cluster Director,
Peter de Jong,
Program Officer,
Anne van der Zwaan,