Record Display for the EPA National Library Catalog
RECORD NUMBER: 276 OF 2132
|OLS Field Name||OLS Field Data|
|Main Title||Biological-chemical process for removing phosphorus at Reno/Sparks, NV /|
|Author||Drnevich, R. F.|
|CORP Author||Union Carbide Corp., Tonawanda, NY. ;Reno/Sparks Wastewater Treatment Facility, Sparks, NV.;Municipal Environmental Research Lab., Cincinnati, OH.|
|Publisher||Environmental Protection Agency, Office of Research and Development, Municipal Environmental Research Laboratory ; For sale by the National Technical Information Service,|
|Report Number||EPA/600/2-79/007; EPA-R-804931|
|Stock Number||PB-294 292|
|Subjects||Phosphorus. ; Sewage sludge. ; Sewage--Purification--Activated sludge process.|
|Additional Subjects||Sewage treatment ; Activated sludge process ; Phosphorus ; Aerobic processes ; Biomass ; Separated ; Performance evaluation ; Dewatering ; Process charting ; Nevada ; Precipitation(Chemistry) ; Design criteria ; Calcium oxides ; Concentration(Composition) ; Microorganisms ; Cost analysis ; Waste recycling ; PhoStrip process ; Anoxic processes ; Sparks(Nevada)|
|Collation||xii, 139 pages : illustrations ; 28 cm.|
This demonstration project was initiated with the purpose of establishing the capability of the PhoStrip system to remove phosphorus on a full scale activated sludge system and compare these results to those obtained on a pilot scale system. This process employs the capability of activated sludge to take up and release phosphorus as a result of being cycled between aerobic and anoxic conditions. During the aerobic period in the aeration basin the phosphorus in the wastewater is removed by the biomass. The sludge is then separated from the phosphorus-free wastewater in the secondary clarifier. A portion of the return sludge from the clarifier is pumped to an anoxic stripper tank where the phosphorus is released. This phosphorus-containing water is then separated from the sludge either through further thickening of the sludge or through elutriation. The supernatant from the anoxic zone is treated with lime to precipitate the phosphorus and the sludge from the anoxic zone and returned to the aeration basin. The pilot and full scale testing was performed at the Reno/Sparks Joint Water Pollution Control Plant located in Sparks, Nevada. The pilot scale system consisted of a 0.11 cu m/hr diffused air activated sludge system. This system was designed to produce optimum performance with the elutriation mode of separating the phosphorus from the sludge in the anoxic zone (stripper tank). The full scale system consisted of a temporary modification of the Reno/Sparks plant. Treating one-third of the plant flow (25,000 cu m/d) was first tested using the thickening mode of separating phosphorus from the sludge in the thickener. Later two-thirds of the plant flow (51,000 cu m/d) was treated utilizing the elutriation method.
Grant no. 804931. Feb. 1979. Includes bibliographical references. Microfiche.