Sustainable Removal of Ammonia from the Anaerobic Digester Supernatant Line Using a Prussian Blue Analogue (PBA) Composite Adsorbent

Paz Nativ, Zenebu Abera Derbew, Chen Dagan-Jaldety, Yaron Aviezer, Raz Ben-Asher, Ori Lahav*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This paper reports on the physico-chemical removal of NH4+ from the supernatant line in municipal wastewater treatment plants (WWTPs), using zinc-hexa-cyano-ferrate (ZnHCF) beads. The work is divided into three parts: First, the characteristics of three (Zn-, Co-, Ni-) types of HCF beads were determined, with a finding that ZnHCF was the most suitable for the purpose of this work. Second, synthetic and actual supernatant wastewater was passed through a ZnHCF column for many cycles until apparent steady-state results were attained. Due to the very high affinity of the beads toward NH4+ and the much lower affinity toward competing cations, the same regeneration solution could be used for many cycles (20 cycles in this work) without affecting the following adsorption breakthrough curve efficiency and the operational capacity, which was >88% at the end of all adsorption steps. Finally, a cost analysis was performed, revealing that the cost of removing ~500 mg/L of ammonia from the supernatant line is ~$0.02 per m3 of raw wastewater flowing into the plant if the ammonia is recaptured and sold as NH4Cl. This may be cost-effective when the WWTP receives a higher-than-planned load, and an incentive exists for alleviating the ammonia load on the oxidation reactor.

Original languageEnglish
Article number97
JournalChemEngineering
Volume6
Issue number6
DOIs
StatePublished - Dec 2022
Externally publishedYes

Keywords

  • Prussian Blue Analogues (PBA) composite
  • WWTP
  • ammonia
  • dewatering supernatant
  • digested sludge
  • separation

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