Sequential batch reactor wastewater treatment process

A method for controlling the aerobic phase of a wastewater treatment cycle with at least two cycles for a sequencing batch reactor, comprising the steps of:

• filling a tank with wastewater to be treated;
• introducing air through an air blower into the wastewater being treated;
• maintaining at a constant level the volume of air introduced by said air blower per time into the wastewater being treated;
• measuring the concentration of dissolved oxygen at predetermined time intervals in the wastewater to be treated using at least one sensor;
• measuring the average concentration of dissolved oxygen in the wastewater being treated using said at least one sensor;
• determining the volume of air to be introduced per time by said air blower by inputting the average concentration of dissolved oxygen in the wastewater being treated during the aerobic phase of the previous wastewater treatment cycle by inputting said average concentration of dissolved oxygen into a proportional integral derivative algorithm to determine a volume of air to be introduced per time by said air blower during the aerobic phase of the current wastewater treatment cycle;
• discontinuing the introduction of air through said air blower when the change in the slope of the curve representing the concentration of dissolved oxygen in the wastewater being treated exceeds a predetermined set point value, and
• releasing from said tank the treated wastewater.