Additional treatment methods
Water ◼◼← more about this theme
Construction costs ◼◼
Decentralised treatment using helophyte filters can be expanded using other treatment methods to improve the quality of the treated water even further, to any level of quality required, such as membrane filtration and compact treatment using biorotors. Dierenpark Emmen zoo purifies all its wastewater using membrane filtration and recycles it. The cleaning water used in the membrane filtration is treated in a Living Machine (see the example of the Living Machine).