Expert system for control of anaerobic digesters

被引:0
作者
Pullammanappallil, PC
Svoronos, SA
Chynoweth, DP
Lyberatos, G
机构
[1] Univ Florida, Dept Chem Engn, Gainesville, FL 32611 USA
[2] Univ Florida, Dept Agr & Biol Engn, Gainesville, FL 32611 USA
[3] Univ Patras, Dept Chem Engn, Inst Chem Engn & High Temp Chem Proc, GR-26110 Patras, Greece
关键词
anaerobic digestion; biological wastewater treatment; bioprocess; process control; expert system;
D O I
10.1002/(SICI)1097-0290(19980405)58:1<13::AID-BIT2>3.0.CO;2-X
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Continuous anaerobic digesters are systems that present challenging control problems including the possibility that an unmeasured disturbance can change the sign of the steady-state process gain. An expert system is developed that recognizes changes in the sign of process gain and implements appropriate control laws. The sole on-line measured variable is the methane production rate, and the manipulated input is the dilution rate. The expert system changes the dilution rate according to one of four possible strategies: a constrained conventional set-point control law, a constant yield control law (CYCL) that is nearly optimal for the most common cause of change in the sign of the process gain, batch operation, or constant dilution rate. The algorithm uses a t test for determining when to switch to the CYCL and returns to the conventional set-point control law with bumpless transfer. The expert system has proved successful in several experimental tests: severe overload; mild, moderate, and severe underload; and addition of phenol in low and high levels. Phenol is an inhibitor that in high concentrations changes the sign of the process gain. (C) 1998 John Wiley & Sons, Inc.
引用
收藏
页码:13 / 22
页数:10
相关论文
共 23 条
  • [1] ANDREWS JF, 1971, ADV CHEM SER, P126
  • [2] STRUCTURED MODELING OF THE ANAEROBIC-DIGESTION OF BIOMASS PARTICULATES
    BRYERS, JD
    [J]. BIOTECHNOLOGY AND BIOENGINEERING, 1985, 27 (05) : 638 - 649
  • [3] AUTOMATIC-CONTROL OF EFFLUENT QUALITY FROM A HIGH-RATE ANAEROBIC TREATMENT SYSTEM
    DENAC, M
    LEE, PL
    NEWELL, RB
    GREENFIELD, PF
    [J]. WATER RESEARCH, 1990, 24 (05) : 583 - 586
  • [4] ADAPTIVE-CONTROL OF THE HYDROGEN CONCENTRATION IN ANAEROBIC-DIGESTION
    DOCHAIN, D
    PERRIER, M
    PAUSS, A
    [J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1991, 30 (01) : 129 - 136
  • [5] DOCHAIN D, 1989, ADAPTIVE CONTROL STR, P75
  • [6] HARMON J, 1990, P AM CONTROL C, V2, P2156
  • [7] HILL DT, 1982, T ASAE, V25, P1374
  • [8] CONTROL PARAMETER VARIATIONS IN AN ANAEROBIC FLUIDIZED-BED REACTOR SUBJECTED TO ORGANIC SHOCKLOADS
    MATHIOT, S
    ESCOFFIER, Y
    EHLINGER, F
    COUDERC, JP
    LEYRIS, JP
    MOLETTA, R
    [J]. WATER SCIENCE AND TECHNOLOGY, 1992, 25 (07) : 93 - 101
  • [9] Morari M., 1989, ROBUST PROCESS CONTR
  • [10] MORARI MM, 1984, P AM CONTROL C, V1, P661