It is to be expected that existing production sites will be modernised, expanded and thus adapted to current requirements and regulations. This also includes the treatment of process wastewater, which must be treated in a much more complex and at the same time more energy-efficient way due to increasingly strict environmental regulations. This can be very challenging for older plants that have already been adapted and enlarged several times. It applies, for example, to the integration of new process stages during operation and, possibly, to limited space conditions. For the oil & gas downstream sector, H+E offers proven and stable processes as well as energy-optimised plants for industrial water and wastewater treatment, from pre-assembled system units to fully operational turnkey plants.