Preferential removal of ammonia and phosphates
Patent 3984313 Issued on October 5, 1976. Estimated Expiration Date: 
October 5, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 5, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3139401 3428426 3475330 3499837 3575852 3579322 InventorAssigneeApplicationNo. 570141 filed on 04/21/1975US Classes:210/664, By distilling or degassing210/673, Utilizing gas, water, or chemical oxidizing or reducing agent210/903, Nitrogenous210/906Phosphorus containingExaminersPrimary: Hart, Charles N.Assistant: Cintins, Ivars Attorney, Agent or FirmAbstractSewage water containing many pollutants including ammonia and phosphates is treated so that the ammonia and phosphates are preferentially removed through ion exchange while the other contaminants are allowed to remain in the water. Ferric hydroxide is deposited within the matrix of strong acid type cation exchange resin and the resin is rejuvenated with sodium hydroxide. | |
