On-line estimation of the dissolved zinc concentration during ZnS precipitation in a continuous stirred tank reactor (CSTR).
In this paper a method is presented to estimate the reaction term of zinc sulphide precipitation and the zinc concentration in a CSTR, using the read-out signal of a sulphide selective electrode. The reaction between zinc and sulphide is described by a non-linear model and therefore classical observer theory cannot be applied directly, as this theory was initially developed for linear systems. However, by linear reparametrization of this non-linear system, the linear observer theory can be applied in an effective way. This is illustrated by a zinc sulphide example using real data.
Wageningen University, Wageningen, The Netherlands.
T I M
TI
Grootscholten
K J
KJ
Keesman
P N L
PN
Lens
D011232:Chemical Precipitation; D008962:Models, Theoretical; D009862:Online Systems; D013440:Sulfides / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000379:methods*; D015032:Zinc / Q000032:analysis* / Q000737:chemistry; D017967:Zinc Compounds / Q000737:chemistry*
D013440:Sulfides; D017967:Zinc Compounds; D015032:Zinc; C031238:zinc sulfide