Phosphate precipitation with ferrous iron
By: by Masood Ghassemi [and] Howard L. Recht.
Contributors: Recht, Howard Leonard, 1927- joint author.; United States. Environmental Protection Agency. Office of Research and Monitoring.
Series: Water pollution control research series
Publisher: [U.S. Environmental Protection Agency]; for sale by the Supt. of Docs., U.S. Govt. Print. Off.
Published: 1971
Place of publication: Washington
Language: eng
Number of pages: 64
Subjects: Sewage -- Purification.; Precipitation (Chemistry); Phosphates.; Ferrous salts.
Description: Of a number of methods available for phosphate removal from waste water, chemical precipitation (often called coagulation) using aluminum, ferric iron, ferrous iron and lime is considered to be the most economical. The objective of the present study has been two-fold: To evaluate the effects of pH and reactant concentration on the rate and efficiency of phosphate removal from synthetic and secondary effluent wastewaters and on the nature of the precipitates formed; and to compare the data on the Fe(II)-phosphate precipitation system with the available data for Fe(III)- and Al(III)-phosphate systems. Most of the experiments in the study were conducted on pure orthophosphate solutions and in the absence of dissolved oxygen. Only a limited number of tests were made of the use of ferrous iron for orthophosphate removal from wastewaters containing dissolved oxygen.
Notes: Includes bibliographical references.
"17010 EKI 09/71."
"Contract #14-12-817."
Prepared for the Office of Research and Monitoring, U.S. Environmental Protection Agency.