What is the waste hierarchy?

16 September 2020

What is the waste hierarchy?

You may have seen us talking about how reuse of materials such as cardboard boxes pushes the waste up the waste hierarchy, but what exactly is the waste hierarchy and how does reuse come into it?

How the Waste Hierarchy Works

The waste hierarchy ranks waste management options according to what is best for the environment, in order of importance from top to bottom:

Prevention
Preparing for Re-use
Recycling
Other recovery
Disposal 

the waste hierarchy

Let's look at these in more detail:

1. Prevention

In industry, prevention means designing carefully to reduce the use of materials, building products that last for longer, and using materials that are less hazardous or more easy to reuse and recycle. In a domestic setting, this means buying less and buying sustainable, reusable and recyclable products, which of course relies on manufacturers to prevent waste as much as possible in the first place. Where you cannot prevent waste by reducing materials and consumption, you would look to reuse as the next best thing.

2. Preparing for re-use

There are a range of actions that can be taken when preparing items for re-use. This could be quality checking, cleaning, sorting, repairing where necessary and refurbishing. It can apply to whole items or spare parts. If an item has been through this process and continues to have value for someone then it can be reused, often multiple times. This is the ideal scenario in a situation where an item is necessary, processes and materials have already been streamlined for efficiency, and resources are utilised carefully. 

3. Recycling

Recycling is determined to be a process that turns waste into a new substance or product - 'new' does not have to mean different. Examples of recycling are:

  • Pulping waste cardboard boxes to remanufacture into new boxes
  • Using car tyres to make soles for shoes
  • Processing aluminium to make new drinks cans, or glass for bottles

Recycling can also at times include composting but only if quality protocols are met. Large-scale composting is not available to much of the UK domestic market, so food waste ends up at the bottom of the hierarchy in disposal, ending up in landfill. There is great potential for improvement in this area.

4. Other recovery

'Other recovery' sounds vague doesn't it? When we talk about other forms of recovery we are looking towards:

  • Anaerobic digestion (often used for food waste)
  • Incineration with energy recovery (the conversion of waste into usable heat, electricity, or fuel)

These 'other recovery' options are ideal for waste materials that are non-recyclable or non-reusable. For any other material, waste should be handled in a method that places it higher in the waste hierarchy.

5. Disposal

At the bottom of the waste hierarchy is disposal, which occurs only as a last resort and ideally not at all. Disposal is material sent to landfill or incinerated without any energy recovery. Disposal has no benefits, and increases pollution while contributing to resource depletion. Avoid at all costs.

Resources

Gov.uk has a fantastic resource, the Waste Hierarchy Guidance PDF, that helps you apply the waste hierarchy to your unwanted byproducts, helping you to understand how best to manage waste and processing.