Comparison between dynamics and control performance of mesophilic and thermophilic anaerobic sludge digesters

摘要: Abstract Two anaerobic digestion schemes, namely mesophilic and thermophilic processes, have been analysed for process stability controllability. As in any control problem, three types of variable are distinguished this study, i.e. disturbance, manipulated controlled variables. Substrate concentration S i influent temperature T the disturbance The variables sewage sludge rate Q specific heat addition G u . effluent substrate A system including a proportional—integral (PI) controller groups is proposed. Multivariable steady state methods such as relative gain array, Niederlinski criterion, singular value decomposition Morari integral controllability employed. Several dynamic analyses biggest log-modulus tuning, robustness analysis Tyreus load rejection criterion carried out. Steady results used pairing. multivariable show that more favourable terms speed response disinfection capability. It also maintains if properly.