Hot Mix Asphalt Recycling: Practices and Principles

Hot mix asphalt recycling has become common practice all over the world since the 1970s because of the crisis in oil prices. In the Netherlands, hot recycling has advanced to such an extent that in most of the mixtures more than 50% of reclaimed asphalt (RA) is allowed. These mixtures with such a high RA content are produced in a batch plant to...

Magnetic Density Separation of Polyolefin Wastes

Polymer recycling has significantly positive impacts on the environment, economics and society. Using recycled polymer to replace virgins reduces the growing amount of post-consumer polymer wastes, decreases the demand for fossil fuel and creates local jobs. As the most used polymer types, polyolefins certainly have attracted attention of...

The ecology of metals

Quality improvement of granular secondary raw building materials by separation and cleansing techniques

Contaminated granular wastes are potentially reusable because they have similar physical and chemical properties as primary raw building materials. From environmental aspects, the reuse must not result in polluting the soil, groundwater and surface water. Therefore the leaching values of inorganic components such as heavy metals and the...

Closing the clay brick cycle

The QWERTY/EE concept, Quantifying Recyclability and Eco-Efficiency for End-of-Life Treatment of Consumer Electronic Products

The QWERTY/EE concept addresses recyclability and eco-efficiency of take-back and recycling of consumer electronic products, a topic currently receiving large international attention. Through the environmental part of the concept an alternative for usual weight based recycling percentages is presented. In addition, economic effects of take-back...