I like the dustbin (or addressed as filter bin in this article) mentioned in this article, especially the concept of separating wet and dry waste. Try it just you feel it is workable!
A filter bin is another gadget that I would consider essential for the camp kitchen. Waste disposal is very important to handle correctly at camp, hygiene in camp is very important to control for everyone’s good health. You will need to build at least two types of bins, one for dry refuse (e.g. empty packets, tins, sweet wrappers) and one for those with a ‘wet’ content (food slops, dirty washing up water etc.).
Simply construct two ‘box’ frames formed from uprights driven into the ground lashed together. It would be good idea to site the bins in the same place, within the same frame. Attach a strong plastic bag within each box securing it firmly at the corners at least. Both of the bags should have perforated bottoms (use a fork to make plenty of small holes). The dry bin can be now left as is. The wet bin will now require lining with some material to absorb the waste. A sensible technique would be bracken on the bottom weighed down with small stones. A layer of charcoal and then sand/gravel should go on top of this, finished off with a layer of bracken. This will have all the properties to absorb all types of waste, water/grease etc. If you want to finish this off you could construct a lid to cover the bins (if you think the local wildlife will be inspecting the left-overs when you turn in for the night) although I would leave the lid off during the day for ease of use and to remind everyone exactly where they should be putting their rubbish!