Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    '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.

    We have a manual that explains all the features 

Record number 325584
Title Control of the sulfide (S2-) concentration for optimal zinc removal by sulfide precipitation in a continuously stirred tank reactor
Author(s) Veeken, A.H.M.; Akoto, L.; Pol, L.W.H.; Weijma, J.
Source Water Research 37 (2003)15. - ISSN 0043-1354 - p. 3709 - 3717.
DOI https://doi.org/10.1016/S0043-1354(03)00262-8
Department(s) Environmental Technology
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) afvalwaterbehandeling - zink - verwijdering - chemische precipitatie - sulfiden - sulfaat reducerende bacteriën - waste water treatment - zinc - removal - chemical precipitation - sulfides - sulfate reducing bacteria - sulfate-reducing bacteria - crystal precipitation - particle formation - sphalerite zns - solubility - mechanism
Categories Waste Water Treatment
Abstract Precipitation of Zn2+ with S2− was studied at room temperature in a continuously stirred tank reactor of 0.5 l to which solutions of ZnSO4 (800–5800 mg Zn2+/l) and Na2S were supplied. The pH was controlled at 6.5 and S2− concentration in the reactor was controlled at set point values ranging from 3.2x10−19 to 3.2x10−4 mg l−1, making use of an ion-selective S2− electrode
Precipitation of Zn2+ with S2- was studied at room temperature in a continuously stirred tank reactor of 0.51 to which solutions of ZnSO4 (800-5800 mg(-1) Zn2+) and Na2S were supplied. The pH was controlled at 6.5 and S2- concentration in the reactor was controlled at set point values ranging from 3.2 x 10(-19) to 3.2 x 10(-4) mg l(-1), making use of an ion-selective S2- electrode. In steady state, the mean particle size of the ZnS precipitate decreased linearly from 22 to 1 mum for S2- levels dropping from 3.2 x 10(-4) to 3.2 x 10(-18) mg l(-1). At 3.2 x 10(-11) Mg l(-1) of S2-, the supplies of ZnSO4 and Na2S solutions were stoichiometric for ZnS precipitation. At this S2- level, removal of dissolved zinc was optimal with effluent zinc concentration <0.03 mg l(-1) while ZnS particles formed with a mean geometric diameter of about 10 mum. Below 3.2 x 10(-11) mg l(-1) of S2- insufficient sulfide was added for complete zinc precipitation. At S2- levels higher than 3.2 x 10(-11) mg l(-1) the effluent zinc concentration increased due to the formation of soluble zinc sulfide complexes as confirmed by chemical equilibrium model calculations. (C) 2003 Elsevier Science Ltd. All rights reserved.
Comments
There are no comments yet. You can post the first one!
Post a comment
 
Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.