Wetland Waste Treatment.
I love this idea more than I love cake.
The general idea behind it is that Wetland plants have a natural ability to treat waste water and applying that ability to a more urban use. Some cities and individuals already make use of this idea. For more in depth information follow the link.
WetlandsMaking wetland waste treatment a part of normal waste treatment within a city would help increase the quality of the water and lower long term costs within the city. Also it is just positively green. If anyone would want to learn more or if I have time later I will write a more in depth and proper analysis of this.