Infrastructure Models for Ecological Wastewater Management - Restorative Redevelopment of Devastated Ecocultural Landscapes - page 409

FIGURE 20.8 Small-diameter pipes for settled-sewage system. Inset: Machine for fusion
welding. Photos courtesy North American Wetland Engineering LLC.

FIGURE 20.9 Surface-flow wetland near Pensacola, Florida. Photo courtesy S. Wallace.

treatment is lost if the mechanical components break down), and have relatively
low energy inputs compared to conventional mechanical treatment processes (see
Table 18.2).
The larger challenge with semipassive treatment systems lies in management of
the system. While simple to operate, they are not maintenance-free. Through the
introduction of mechanical treatment components, a host of maintenance and repair
tasks is added to the responsibilities of the management entity. Communities must