ABSTRACT
Full-scale systems for wastewater treatment have been designed and constructed for treatment of weak landfill leachate, woodwaste leachate, and fish hatchery wastewaters. This chapter describes some applications of engineered and natural marshes for treatment of different types of wastewater. It describes general design of the marsh and associated retention times. The objective was to determine if marsh treatment technology could replace the existing lagoon and spray irrigation treatment system at lower operating costs. A subsurface inflow pipe was positioned at the bottom of the marsh as an extension of the leachate collection pipe. In order to use some of the natural marsh for fill area and to treat the expected increase in leachate volumes, the operators opted for a combination treatment system. The marsh performance has been monitored for removal of toxicity to rainbow trout. There is no measurable flow through the marsh during the summer; therefore, limited data have been collected since the marsh’s completion in January 1991.
