Inventors:
John R. Smith - Pittsburgh PA, US
Jaw Fu - Murrysville PA, US
Rajat Ghosh - Pittsburgh PA, US
Kevin Kitzman - Wenatchee WA, US
Jonell Kerkhoff - Murrysville PA, US
Robert C. Horger - New Kensington PA, US
Dennis L. Fulmer - Greensburg PA, US
Aniruddha Bhattachayya - Fairfax Station VA, US
Andrew C. Middleton - Mount Sidney VA, US
Robin L. Weightman - Murrysville PA, US
Assignee:
Alcoa Inc. - Pittsburgh PA
International Classification:
B01D 24/02
B01D 39/06
Abstract:
Wastewater treatment systems, methods and apparatus for polishing a wastewater stream comprising a plurality of contaminants are provided. One system includes a vessel containing a plurality of natural media filtration agents selected to remove selected ones of the plurality of contaminants from the wastewater stream. In one embodiment, the vessel includes a bed of bauxite residue and at least one other natural media filtration agent. In another embodiment, the vessel includes a bed of compost and at least one other natural media filtration agent. The vessel includes a wastewater inlet that is in fluid communication with one or more of the natural media filtration agents. The vessel includes a wastewater outlet that is in fluid communication with one or more of the natural media filtration agents.