Sulfide Precipitation in Wastewater at Short Timescales

Bruno Kiilerich, Wilbert van de Ven, Asbjørn Haaning Nielsen, Jes Vollertsen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

7 Citationer (Scopus)
125 Downloads (Pure)

Resumé

Abatement of sulfides in sewer systems using iron salts is a widely used strategy. When dosing at the end of a pumping main, the reaction kinetics of sulfide precipitation becomes important. Traditionally the reaction has been assumed to be rapid or even instantaneous. This work shows that this is not the case for sulfide precipitation by ferric iron. Instead, the reaction time was found to be on a timescale where it must be considered when performing end-of-pipe treatment. For real wastewaters at pH 7, a stoichiometric ratio around 14 mol Fe(II) (mol S(−II))−1 was obtained after 1.5 s, while the ratio dropped to about 5 mol Fe(II) (mol S(−II))−1 after 30 s. Equilibrium calculations yielded a theoretic ratio of 2 mol Fe(II) (mol S(−II))−1, indicating that the process had not equilibrated within the span of the experiment. Correspondingly, the highest sulfide conversion only reached 60%. These findings differed significantly from what has been demonstrated in previous studies and what is attained from theoretical equilibrium conditions.
OriginalsprogEngelsk
TidsskriftWater
Vol/bind9
Udgave nummer9
Sider (fra-til)1-13
Antal sider13
ISSN2073-4441
DOI
StatusUdgivet - sep. 2017

Fingerprint

Sulfides
Waste Water
sulfides
wastewater
Wastewater
sulfide
timescale
Iron
sewer systems
iron
reaction kinetics
Sewers
pipes
Reaction kinetics
pumping
pipe
Salts
experiment
Pipe
salt

Citer dette

Kiilerich, Bruno ; van de Ven, Wilbert ; Nielsen, Asbjørn Haaning ; Vollertsen, Jes. / Sulfide Precipitation in Wastewater at Short Timescales. I: Water. 2017 ; Bind 9, Nr. 9. s. 1-13.
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title = "Sulfide Precipitation in Wastewater at Short Timescales",
abstract = "Abatement of sulfides in sewer systems using iron salts is a widely used strategy. When dosing at the end of a pumping main, the reaction kinetics of sulfide precipitation becomes important. Traditionally the reaction has been assumed to be rapid or even instantaneous. This work shows that this is not the case for sulfide precipitation by ferric iron. Instead, the reaction time was found to be on a timescale where it must be considered when performing end-of-pipe treatment. For real wastewaters at pH 7, a stoichiometric ratio around 14 mol Fe(II) (mol S(−II))−1 was obtained after 1.5 s, while the ratio dropped to about 5 mol Fe(II) (mol S(−II))−1 after 30 s. Equilibrium calculations yielded a theoretic ratio of 2 mol Fe(II) (mol S(−II))−1, indicating that the process had not equilibrated within the span of the experiment. Correspondingly, the highest sulfide conversion only reached 60{\%}. These findings differed significantly from what has been demonstrated in previous studies and what is attained from theoretical equilibrium conditions.",
author = "Bruno Kiilerich and {van de Ven}, Wilbert and Nielsen, {Asbj{\o}rn Haaning} and Jes Vollertsen",
year = "2017",
month = "9",
doi = "10.3390/w9090670",
language = "English",
volume = "9",
pages = "1--13",
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Sulfide Precipitation in Wastewater at Short Timescales. / Kiilerich, Bruno; van de Ven, Wilbert; Nielsen, Asbjørn Haaning; Vollertsen, Jes.

I: Water, Bind 9, Nr. 9, 09.2017, s. 1-13.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Sulfide Precipitation in Wastewater at Short Timescales

AU - Kiilerich, Bruno

AU - van de Ven, Wilbert

AU - Nielsen, Asbjørn Haaning

AU - Vollertsen, Jes

PY - 2017/9

Y1 - 2017/9

N2 - Abatement of sulfides in sewer systems using iron salts is a widely used strategy. When dosing at the end of a pumping main, the reaction kinetics of sulfide precipitation becomes important. Traditionally the reaction has been assumed to be rapid or even instantaneous. This work shows that this is not the case for sulfide precipitation by ferric iron. Instead, the reaction time was found to be on a timescale where it must be considered when performing end-of-pipe treatment. For real wastewaters at pH 7, a stoichiometric ratio around 14 mol Fe(II) (mol S(−II))−1 was obtained after 1.5 s, while the ratio dropped to about 5 mol Fe(II) (mol S(−II))−1 after 30 s. Equilibrium calculations yielded a theoretic ratio of 2 mol Fe(II) (mol S(−II))−1, indicating that the process had not equilibrated within the span of the experiment. Correspondingly, the highest sulfide conversion only reached 60%. These findings differed significantly from what has been demonstrated in previous studies and what is attained from theoretical equilibrium conditions.

AB - Abatement of sulfides in sewer systems using iron salts is a widely used strategy. When dosing at the end of a pumping main, the reaction kinetics of sulfide precipitation becomes important. Traditionally the reaction has been assumed to be rapid or even instantaneous. This work shows that this is not the case for sulfide precipitation by ferric iron. Instead, the reaction time was found to be on a timescale where it must be considered when performing end-of-pipe treatment. For real wastewaters at pH 7, a stoichiometric ratio around 14 mol Fe(II) (mol S(−II))−1 was obtained after 1.5 s, while the ratio dropped to about 5 mol Fe(II) (mol S(−II))−1 after 30 s. Equilibrium calculations yielded a theoretic ratio of 2 mol Fe(II) (mol S(−II))−1, indicating that the process had not equilibrated within the span of the experiment. Correspondingly, the highest sulfide conversion only reached 60%. These findings differed significantly from what has been demonstrated in previous studies and what is attained from theoretical equilibrium conditions.

U2 - 10.3390/w9090670

DO - 10.3390/w9090670

M3 - Journal article

VL - 9

SP - 1

EP - 13

JO - Water

JF - Water

SN - 2073-4441

IS - 9

ER -