Automatic control of volatile fatty acids in anaerobic digestion using a fuzzy logic based approach

被引:35
|
作者
Puñal, A [1 ]
Palazzotto, L [1 ]
Bouvier, JC [1 ]
Conte, T [1 ]
Steyer, JP [1 ]
机构
[1] INRA, Lab Biotechnol Envronnem, LBE, INRA, F-11100 Narbonne, France
关键词
anaerobic treatment; automatic control; fuzzy logic; influent flow rate; vinasses and volatile fatty acids;
D O I
10.2166/wst.2003.0368
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A control law based on fuzzy logic was developed and validated for an anaerobic wastewater treatment process. The controlled variable was the concentration of volatile fatty acids (VFA) in the reactor and the manipulated variable was the input flow rate. In order to use it as the input of the fuzzy sets, the controlled variable was treated using an algorithm of interpolation, extrapolation and filtering. The treatment of VFA values attempted to anticipate the behaviour of the variable and to avoid the inherent delay of the response, associated to the time constant of the system. Furthermore, the controlled variable derivative was used as a second input of the fuzzy sets to increase or decrease the speed of the control action. The control law was applied to a 0.948 m(3) fixed-bed anaerobic reactor treating raw and diluted (1:2) industrial distillery vinasses. The validation was performed establishing different transient states between different set points in the range of 0.8 and 1.8 g VFA/l and different concentrations of the influent. The control law proved to be reliable supplying an adequate control action in terms of amplitude and velocity to achieve the desired set point for different types of perturbation and control purposes.
引用
收藏
页码:103 / 110
页数:8
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