Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 350549
Title Dynamic modelling and process control of ZnS precipitation
Author(s) König, J.; Keesman, K.J.; Veeken, A.H.M.; Lens, P.N.L.
Source Separation Science and Technology 41 (2006)6. - ISSN 0149-6395 - p. 1025 - 1042.
Department(s) Systems and Control Group
Environmental Technology
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) reducing bacterial biofilms - sulfate reduction - heavy-metals - reactor - accumulation
Abstract This paper presents the dynamic modelling and design of a control strategy for the ZnS precipitation process. During lab¿scale experiments, the sulfide concentration in a precipitator was controlled at a prespecified pS value by manipulating the flow from a buffer vessel. Batch tests showed that the optimal condition for zinc sulfide precipitation is at a sulfide concentration of 10¿15 mole/l (pS 15). Experiments with the precipitator showed that the sulfide concentration highly deviates from a given setpoint when proportional (P) control is used, but this deviation can be decreased using a Proportional Integral (PI) controller. Moreover, the PI controller was able to handle sudden disturbances in the process conditions (pH, influent flow rate, or zinc and sulfide concentration). Additional precipitation experiments were conducted using effluent from a sulfate reducing gas¿lift reactor to determine if the compounds present in the effluent influence the control process. With the gas¿lift reactor effluent and a PI controller, the desired sulfide concentration was reached almost instantaneously (within 15 minutes) within acceptable margins (2¿5%)
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