ABSTRACT
For HSSF wetlands, primary treatment, at a minimum, is required to remove settleable and floating solids prior to the wetland bed. This is typically provided through the use of settling tanks. Some projects may employ a higher level of pretreatment through the use of activated sludge systems, lagoons, or other treatment processes. Vertical flow (VF) wetlands may or may not have such preliminary treatment stages, and biosolids systems will receive material of different quality depending on the nature of the overall treatment process. This chapter focuses on the sizing of SSF wetland components, recognizing that this will be only one part of the overall treatment process.
