This may help http://www.environment-a...gs/businesses/62689.aspx

Technically its sanitary or offensive waste and must be managed accordingly though you are not likely to have much probem if you dispose of small arisings in a domestic waste stream. Be aware that if you do this, the environment Agency might wake up and make a nuisance of themselves, or more likely the LA will make an issue of mixing wastes in your trade waste collections and expect a separate collection. What you are doing now is almost correct, but if you have a special collection of this sanitary waste by a LA who are accepting this in black bags then its already gone wrong - it should be ina yellow/black tiger strip bag. You need to consider waste categorisaton (though you may get awa with very small volumes), suitable containers that are properly colour coded, the containers themselves that need to me kept clean etc. Easiest option may be to get a contract for washroom hygiene services and have someone else deal with the entire issue including supplies, collection and disposal, and hygiene.