Waste water plumbing has traditionally been a fairly simple process using solvent-weld or push-fit PVC pipes and fittings. Due to the problems of PVC as a material it is worth considering using polypropylene (PP) as an alternative. (See the page on PVC). It is now becoming more readily available. It is more easily recycled and can also be easily reused. Most of the systems on the market are interconnectable.
There are a few products on the market for reclaiming heat from waste warm water – especially shower waste, by running the waste water through a heat exchanger and directly heating the incoming water.
The Building RegulationsThese are the mass of regulations that cover safety, health, welfare, convenience, energy efficiency etc. in the way buildings are constructed. Not to be confused with Planning consent (which is more to do with whether you can put up the building in the first place) have quite a lot to say about pipe sizes, lengths of pipe runs, traps, vents and overflows. Most of this information should show up on your drawings. The Approved Document, part H – Drainage and waste disposal has a section on Sanitary pipework which covers most of the sizing, gradients etc. Because of all the detail in this document it goes a long way to being a design guide on the subject.
There is also a section on the plumbing concerning Greywater recovery systems