Tianjin venture environmental protection group limited by share Ltd.（A share code：600874；H share code：1065） Tianjin Jingu WWTP（Jizhuangzi WWTP relocation）, CNWG designed, 55×104 m3/d, 1 class A, BIOS II started up in 2015.
Process control and operation control combination
Jingu WWTP used advanced multiple AAO+AO process with 2 section IRQ.
Advanced multiple AAO+AO process
Bioprocess Intelligence Optimization and Dynamic Control System (BIOS II) combined feed-forward control and feed-back control.
Feed-forward control means using data of instruments in front of bioreactor
Feed-back control means also monitoring effluent NH4-N&NO3-N
DO optimization control：Through monitoring influent flow quantity and pollutants (NH4-N/COD) loading, BIOS II calculates optimized DO set point of each aeration zone. This DO set point ensures aerobic degradation of pollutants and nitrification of ammonia to make discharge match permit. On the other hand, this DO set point will not be too high to waste aeration energy and affect de-nitrification by IRQ.
BIOS II combines the control of air blowers and electric valves to save aeration energy. Especially for big WWTP like Jingu, BIOS II uses dynamic MOV logic to ensure some valve keep on bigger position and reduce pressure of pipe system which causes air blowers can work with air flow control in less back pressure.
IRQ optimization control：Through monitoring NO3-N concentration in effluent, BIOS II calculates optimized set point of each train and each section, ensure de-nitrification to increase TN removal and reducing aeration energy.
Carbon dosing optimization control：Through monitoring NO3-N concentration, BIOS II calculates carbon dosing set point to match need of de-nitrification and avoid add too much to increase BOD in effluent. This function need to test different DNR with different carbon source by ABAM.