SENVAL: A project to develop a highly efficent system of waste residual drying

Logo MINECO-FEDER-Low Resolution-v01This Project wants to develop a High Efficient and speed Energetic System to dry organic wastes generated by residual water, including disinfection.

It tries to reduce the energy consuption up to 50% compared with conventional drying systems and a considerable reduction of CO2 to achieve the objectives adopted by the Kyoto Protocol from 2013 to 2015.

The first objective will be to obtain and to validate a basic laboratory device (pre-prototype) that accomplishes the minimum requirements for urban locations as well as for industrial or agronomical places, in order to get a final objective of getting these kind of plants in any location.

SENVAL Project (No. IPT-2012-0547-120000) is coordinated  by CEINNMAT and UPV is participating as a partner through DIMAS Research Group as well as  AIDICO Research Institute. It is financed by Ministerio de Economía y Competitividad and Fondos FEDER form European Union, in the Program INNPACTO 2012.

Measurement of commercial epoxies and hardeners with Dielectric Kit

Epoxy resins are widely used for many industrial applications such as surface coatings, adhesives, and fiber-reinforced composites, because of mechanical and electrical properties, easy processing and low cost.

The conversion from an epoxy resin into a plastic requires the addition of a suitable hardener. For hardening at room temperature, amines and amides are primarily used. It is also common the addition of substances to modify the thermal and mechanical properties of epoxies.

Research in the area of microwave processing of epoxy resins, has demonstrated that microwave energy can cure epoxy materials in a wide variety of applications at much faster times (<10%) than convection or IR heating. This form of energy transfer offers many distinct advantages over conventional heating, such as volumetric, fast, selective, instantaneous, and controllable heating.

The ability to process epoxies with microwaves mainly depends on the epoxy dielectric properties.MINOLTA DIGITAL CAMERA The use of modifiers can significantly change thermal and dielectric properties of epoxy resins. Thus, correct measurement of dielectric properties of epoxies and hardeners is very important to obtain critical information to process these materials with microwave energy.

The Dielectric Kit for vials is an accurate and easy to use equipment which allows the determination of dielectric properties of materials. In this case, different commercial epoxies and hardeners have been characterized at a frequency near the ISM standard for heating applications (2.45 GHz). Samples are introduced in standard 1mL vials and the Dielectric Kit provides the material dielectric properties without any additional calibration (See Table).


With a rapid test, the ability of materials to be heated by microwave energy can be ranked from simple inspection of the loss tangent given by the Dielectric Kit. The higher the sample loss tangent is, the better it will absorb microwave energy and dissipate it as heat.