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Phosphorus Removal from Municipal Wastewater by Hydrous Ferric Oxide Reactive Filtration and Coupled Chemically Enhanced Secondary Treatment: Part I—Performance
Author(s) -
Newcombe R. L.,
Rule R. A.,
Hart B. K.,
Möller G.
Publication year - 2008
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143007x221003
Subject(s) - effluent , phosphorus , ferric , wastewater , filtration (mathematics) , chemistry , sewage treatment , turbidity , hydrous ferric oxides , secondary treatment , pilot plant , environmental engineering , environmental chemistry , pulp and paper industry , environmental science , inorganic chemistry , adsorption , geology , statistics , mathematics , oceanography , organic chemistry , sorption , engineering
This work examines the performance of a hydrous ferric oxide (HFO) reactive filtration (RF) process with coupled chemically enhanced secondary treatment (RECYCLE) for phosphorus removal from municipal wastewater (HFO‐RF‐RECYCLE). A 3‐month, 0.95‐ML/d (0.25‐mgd) demonstration of HFO‐RF‐RECYCLE was performed at a municipal wastewater treatment plant equipped with oxidation ditches and secondary clarifiers. Influent to the plant averaged 6.0 mg/L phosphorus, with a tertiary effluent average of 0.011 mg/L phosphorus. Iron doses to the plant were low, at 5 mg/L. Inline recycling of HFO solution rejects to the plant influent resulted in a maximum 90.3%, dose‐dependent reduction of phosphorus in the secondary effluent at 4.5 ML/d (1.2 mgd). Other results included reduction of total suspended solids and turbidity. A mass balance analysis was performed. We conclude that HFO‐RF‐RECYCLE may allow very low levels of phosphorus discharge from municipal wastewater treatment plants with a ferric‐iron‐based tertiary filtration process and residual recycling.