A comprehensive laboratory assessment of the effects of sewer-dosed iron salts on wastewater treatment processes

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

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Author(s)

  • Mario Rebosura
  • Sirajus Salehin
  • Ilje Pikaar
  • Xiaoyan Sun
  • Jürg Keller
  • Keshab Sharma

Detail(s)

Original languageEnglish
Pages (from-to)109-117
Journal / PublicationWater Research
Volume146
Publication statusPublished - 1 Dec 2018
Externally publishedYes

Abstract

The effect of iron-dosing in the sewer system, on wastewater treatment processes, was investigated using laboratory-scale wastewater systems comprising sewers, wastewater treatment reactors, sludge thickeners, and anaerobic sludge digesters. Two systems, fed with real domestic wastewater, were operated for over a year. The experimental system received ferric chloride (FeCl3) dosing at 10 mgFe L−1 in the sewer reactor whereas the control system received none. Wastewater, sludge and biogas were extensively sampled, and analysed for relevant parameters. The FeCl3-dosed experimental system displayed a decreased sulfide concentration (by 4.3 ± 0.5 mgS L−1) in sewer effluent, decreased phosphate concentration (by 4.7 ± 0.5 mgP L−1) in biological treatment reactor effluent, and decreased hydrogen sulfide concentration in biogas (911.5 ± 189.9 ppm to 130.0 ± 5.9 ppm), as compared with the control system. The biological nitrogen removal performance of the treatment reactor, and biogas production in the anaerobic digester were not affected by FeCl3-dosing. Furthermore, the dewaterability of the anaerobically digested sludge was enhanced by 17.7 ± 1.0%. These findings demonstrate that iron-dosing to sewers can achieve multiple benefits including sulfide removal in sewers, phosphorus removal during wastewater treatment, and hydrogen sulfide (H2S) removal during biogas generation. Therefore, an integrated approach should be taken when considering iron salts usage in an urban wastewater system. © 2018 Elsevier Ltd

Research Area(s)

  • Anaerobic digestion, Dewaterability, Integrated urban water system, Iron salt dosing, Sequencing batch reactor, Sewer system

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)

A comprehensive laboratory assessment of the effects of sewer-dosed iron salts on wastewater treatment processes. / Rebosura, Mario; Salehin, Sirajus; Pikaar, Ilje et al.
In: Water Research, Vol. 146, 01.12.2018, p. 109-117.

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