Decentralised waste management is about each community managing and processing their waste in their locality and not sending it all to a centralised large processing facility or often land fill.
There are two principles behind decentralised waste management:
When waste is managed at source it becomes a resource
My waste in My Backyard and not in someone else
The earlier we can segregate and process the waste, the resource recovery is much better and transportation and processing costs come down. We all need to take ownership of our waste, we can not dump our waste in other people's backyard and force them to bear the burden of our reckless consumption based lifestyle.