WRAP recognises however that physical conditions such as high rise housing or highly congested roads may prevent sorting at kerbside being the best choice in some circumstances, and says that local authorities are best placed to determine which collection method is most suitable.

It says that where local authorities have the choice, and kerbside collections are not an option, two stream collections which keep paper and card separate from other materials, especially glass, are preferable. This is because they produce the best material for recycling by keeping contamination levels down.

Fully co-mingled (mixed) collections have cost and quality disadvantages which should limit their use except where other options are not suitable.

Among the conclusions is that sorting recycling at the kerbside provides the best quality material and, when total costs are taken into account, is cheaper for council tax payers. This flies in the face of the popular belief that co-mingled recycling collections are cheaper.

WRAP argues that the evidence is clear that the quality of the materials recovered for recycling is affected by the way they are collected. Quality is important because it affects the uses the material can be put to. Quality materials can be easily reused in ways which give the most benefit to the environment. Kerbside sorted materials are consistently good quality with less than 1% being rejected. Co-mingled collections are subject to higher contamination rates and have higher levels of rejection.

Reprocessors of recycled materials in the UK are currently struggling to find enough good quality material for their needs from UK sources despite the volumes being exported. As a result they are importing some material.

Although kerbside sorted materials have the best quality and are likely to go to the most beneficial uses, consumers can still be confident that the great majority of co-mingled materials are recycled in some form and are not sent to landfill.

The leaflet says that the claim that co-mingled collections help boost recycling rates does not tell the whole story. What is important is not the type of collection but the size of the containers householders are given for their recycling, and how often they are collected.

Liz Goodwin, CEO, WRAP, said: “Our evidence shows that in the vast majority of cases, sorting materials for recycling at the kerbside is the best option. It provides the highest quality and means materials can be used in the best end uses from an environmental and economic perspective. We do not believe that householders will object to sorting recycling into different containers. Our research indicates that 87% who have to separate recyclables into different containers say they do not mind doing this. Co-mingled collections should only be used where no other system would work.

“It cannot be right that we cannot provide enough recycled materials of the right quality in the UK and that we are looking to other countries to supply them instead.”

WRAP is advising local authorities who are reviewing their arrangements to base their choices on four considerations:

* Quality of materials
* Cost Efficiency
* Cost Effectiveness
* Public acceptability

WRAP believes that this latest information will help local authorities make informed decisions about the type of collection service they choose.

www.wrap.org.uk