期刊论文1.pdf

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Identification, estimation and control of
biological waste-water treatment
processes
. Beck. . .. .
Indexing terms: Biomass, Control equipment and applications, Biotechnology
Abstract: The biological processes of waste-water treatment have often been regarded in practice as largely
self-controlled and somewhat inflexible in their operation. The paper reviews some of the reasons why it has
been difficult to apply the methods of control theory to these processes, and what the future role of control in
waste-water treatment might be. Attention is restricted to three processes: the activated sludge process, the
oxidation ditch and anaerobic digestion. In contrast to many biotechnical processes, these processes are charac-
terised by a heterogeneous culture of micro-organisms and by multiple substrates degraded along several reac-
tion pathways. Their dynamics are extremely difficult to identify, their observed input/output relationships
frequently exhibiting substantial stability punctuated by abrupt instabilities. Other aspects of their behaviour
are relatively well defined, in particular the dynamics of dissolved oxygen in the activated sludge process, and
have been equally well studied from the point of view of online state-parameter estimation and adaptive control.
There is still, however, a large gap between practice and theory, and, in looking briefly at an agenda of problems