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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

128 Scopus Citations
View graph of relations

Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)3467-3475
Journal / PublicationWater Research
Volume44
Issue number11
Publication statusPublished - Jun 2010
Externally publishedYes

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.

Research Area(s)

  • Integrated sewer, Iron, Modelling, Phosphorus, Sewers, Sulfide, WWTP management

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Iron salts dosage for sulfide control in sewers induces chemical phosphorus removal during wastewater treatment. / Gutierrez, Oriol; Park, Donghee; Sharma, Keshab R. et al.
In: Water Research, Vol. 44, No. 11, 06.2010, p. 3467-3475.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review