Domestic mainstream technologies are: AO, A2O, MBR.
Tonnage: calculated according to water consumption. In some places, the per capita water consumption 150L/ day is calculated, and in some villages, the tonnage of required equipment is determined as accurately as possible.
Effluent standard: current rural level A or 1 level B.
Equipment installation mode: underground (some civil works are needed), above ground, and container (movable).
Power: At present, there are basically two kinds of solar energy and electric energy.
If you have specific projects, you can consult Li Ding, Jiangsu, and make your own equipment and plan.