Water: sewage pumping station

Illustration of a primary sewage treatment plant

Illustration of a tertiary sewage treatment plant

3-D Illustration of a sewage treatment plant with pools

Another illustration of a wastewater treatment plant, with pools, buildings and a drainage pipe

Illustration of a nuclear power station

Illustration of an upright water pipe

Illustration of a power plant with cooling towers releasing steam

Illustration of a drainage pipe aiming downwards