Patent ID: 7416669
Filing Date: 2008-08-26
Classification: C02F,Y10S

Abstract:
1. A method for automatically controlling a treatment process for a liquid, wherein said treatment process comprises subjecting said liquid to an oxic phase, an anoxic phase and an anaerobic phase in a sequential order until a desired level of treatment is achieved, said method for controlling comprising: a. monitoring the concentration of ammonia, nitrate, phosphate and dissolved oxygen in said oxic phase with an ammonia analyzer, a nitrate analyzer, a phosphate analyzer and a dissolved oxygen analyzer, said analyzers transmitting said ammonia, phosphate and dissolved oxygen concentrations to a processor, and said processor terminating said oxic phase and initiating said anoxic phase when said processor determines an oxic phase ending criteria is met; b. monitoring the concentration of nitrates and ammonia in the anoxic phase with a nitrate analyzer, and an ammonia analyzer, said analyzers transmitting said nitrate and ammonia concentrations to a processor and said processor terminating the anoxic phase and initiating the anaerobic phase when said processor determines an anoxic phase ending criteria is met; c. monitoring the concentration of phosphate and ammonia in the anaerobic phase with said phosphate analyzer, and an ammonia analyzer, said analyzers transmitting said concentration to said processor, said processor calculating a rate of change of phosphate concentration and said processor terminating the anaerobic phase and initiating the oxic phase when said processor determines an anaerobic phase ending criteria is met.