Iron salts dosage for sulfide control in sewers induces chemical phosphorus removal during wastewater treatment

Gutierrez, Oriol, Park, Donghee, Sharma, Keshab R. and Yuan, Zhiguo (2010) Iron salts dosage for sulfide control in sewers induces chemical phosphorus removal during wastewater treatment. Water Research, 44 11: 3467-3475. doi:10.1016/j.watres.2010.03.023


Author Gutierrez, Oriol
Park, Donghee
Sharma, Keshab R.
Yuan, Zhiguo
Title Iron salts dosage for sulfide control in sewers induces chemical phosphorus removal during wastewater treatment
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2010-06
Sub-type Article (original research)
DOI 10.1016/j.watres.2010.03.023
Volume 44
Issue 11
Start page 3467
End page 3475
Total pages 9
Editor David Dixon
Jean-Claude Block
Mogens Henze
Place of publication Lisle, IL, U.S.A.
Publisher IWA Publishing
Collection year 2011
Language eng
Formatted abstract
Chemical phosphorus (P) removal during aerobic wastewater treatment induced by iron salt addition in sewer systems for sulfide control is investigated. Aerobic batch tests with activated sludge fed with wastewater containing iron sulfide precipitates showed that iron sulfide was rapidly reoxidised in aerobic conditions, resulting in phosphate precipitation. The amount of P removed was proportional to the amount of iron salts added, and for the sludge used, ratios of 0.44 and 0.37 mgP/mgFe were obtained for ferric and ferrous dosages, respectively. The hydraulic retention time (HRT) of iron sulfide in sewers was found to have a crucial impact on the settling of iron sulfide precipitates during primary settling, with a shorter HRT resulting in a higher concentration of iron sulfide in the primary effluent and thus enabling higher P removal. A mathematical model was developed to describe iron sulfide oxidation in aerated activated sludge and the subsequent iron phosphate precipitation. The model was used to optimise FeCl3 dosing in a real wastewater collection and treatment system. Simulation studies revealed that, by moving FeCl3 dosing from the WWTP, which is the current practice, to a sewer location upstream of the plant, both sulfide control and phosphate removal could be achieved with the current ferric salt consumption. This work highlights the importance of integrated management of sewer networks and wastewater treatment plants.
© 2010 Elsevier Ltd.
Keyword Sulfide
Iron
Sewers
Phosphorus
Modelling
Integrated sewer
WWTP management
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Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Authors prepress title: "Iron salts dosage for sulfide control in sewers enhances phosphorus removal in treatment plants".

Document type: Journal Article
Sub-type: Article (original research)
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Created: Tue, 29 Jun 2010, 13:42:32 EST by Hong Lee on behalf of Advanced Water Management Centre