Nonlinear PI Control with Adaptive Interaction Algorithm for Multivariable Wastewater Treatment Process

Table 1

List of the acronyms.

Acronyms	Descriptions
AE	Aeration energy
AIA	Adaptive interaction algorithm
ASM1	Activated Sludge Model 1
ASP	Activated sludge process
BSM1	Benchmark Simulation Model No. 1
DO	Dissolved oxygen
	Dissolved oxygen control of tank ,
DO345	Dissolved oxygen control of tanks 3, 4, and 5
	Error
	Error of tank ,
ENon-PI	Enhanced nonlinear PI
IAE	Integral of absolute error
ISE	Integral of square error
	Nonlinear gain
	Rate variation of nonlinear gain
	Air flow rate of tank ,
	Proportional gain
	Integral gain
Mean	Absolute error
Max	Maximum absolute deviation from set-point
	Internal recycle flow rate
Std	Standard deviation of the error
WWTP	Wastewater treatment plant