Control of dissolved oxygen for a wastewater treatment process by active disturbance rejection control approach
WEI Wei
ZUO Min
LI Wei
WANG Xiao-yi
LIU Zai-wen
Abstract：Dissolved oxygen(DO)is a key parameter in activated sludge wastewater treatment processes. It relates to the biodegradation of organic compounds,the growth of microorganisms and the effluent quality. DO is always taken as a controlled variable in wastewater treament processes. However,DO concentration is sensitive to many factors,such as the rate of inflow,component of inflow,variation of concentrations.The control of DO concentration is a difficult problem in control engineering. Desired DO concentration is assigned by aeration rate, and dilution rate is taken as the control input. Linear active disturbance rejection control(LADRC)is designed to make DO concentration tracks the setpoints, and,indirectly,the substrate concentration is controlled within an acceptable level.Two cases,i.e.fixed and varied influent substrate concentrations,are considered in simulations. Additionally,in order to verify the disturbance rejection and com-pensation ability of LADRC,a group of numerical simulation is also performed.Numerical results show the fact that both DO concentration tracking and substrate concentration regulation can be realized effectively by LADRC,and LADRC is also able to reject the disturbance and guarantee the effluent quality even if the influent wastewater are fluctuated.
Keywords：wasterwater treatment processdissolved oxygensubstrate concentrationactive disturbance rejection control
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 24-30 )