ABSTRACT
A petroleum refinery operates a landfarm to biodegrade liquid and solid industrial wastes. It is underlain by a tile bed, and treated leachate from it is collected in a retention pond. The refinery wanted to consider options other than trucking, but determined that piping the leachate back to the refinery would be prohibitively expensive. Evaluations of wetland and related treatment options as alternates were carried out. This paper presents analyses and related treatment options for treating the leachate, details how one was selected for recommendation, and presents a preliminary sizing, suggested layout, and costing of that recommendation. A small free-water-surface (FWS) constructed wetland was recommended as suitable for treating the leachate, and was compared with an equivalent subsurface-flow (SSF) wetland.
