Method and apparatus for analysing the efficiency of air diffusers in waste water aeration basins

摘要

The invention relates to the field of wastewater treatment plants involving biological processes carried out in aerobic reactors with submerged air diffusers. A method of obtaining a value for the oxygen transfer efficiency of submerged air diffusers in wastewater aeration basins is provided, wherein the wastewater can be aerated with a quantity of air provided by a controllable aeration system. The method comprises the steps of: aerating the wastewater; measuring an airflow value for the aerating air; measuring the dissolved oxygen content of the wastewater; measuring the temperature of the wastewater; retrieving from a reference source a previously stored special value corresponding to the measured airflow rate; calculating the oxygen transfer efficiency of the basin using the special value, the temperature of the wastewater and the dissolved oxygen content of the wastewater, wherein the reference source is obtained from a prior basin characterisation stage. An apparatus for measuring the oxygen transfer efficiency of wastewater in a basin of a wastewater treatment plant is also claimed.