A Laboratory-Scale Investigation into the use of Powdered Iron for In situ Removal of Phosphorus from Treated Sewage Effluent With Constructed Wetlands

摘要

Incorporation of powdered iron into the root bed of experimental constructed wet- lands removes phosphorus from treated sewage to levels that that easily meet govern- ment guidelines for discharge into natural water bodies. Various combinations of powdered iron and sand were used to determine the best arrangement that removes the largest amount of phosphorus. Macrophytes fulfill a beneficial function by delivering oxygen to the root zone and by improving drainage in the weltand. In these wetlands, cattails (Typha latifolia L.) also take up phosphorus during growth and store significant quantities of it in their leaves.