Ambient iron-mediated aeration (IMA) for water reuse

Yang Deng, James D. Englehardt, Samer Abdul-Aziz, Tristan Bataille, Josenrique Cueto, Omar De Leon, Mary E. Wright, Piero Gardinali, Aarthi Narayanan, Jose Polar, Shibata Tomoyuki

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Global water shortages caused by rapidly expanding population, escalating water consumption, and dwindling water reserves have rendered water reuse a strategically significant approach to meet current and future water demand. This study is the first to our knowledge to evaluate the technical feasibility of iron-mediated aeration (IMA), an innovative, potentially economical, holistic, oxidizing co-precipitation process operating at room temperature, atmospheric pressure, and neutral pH, for water reuse. In the IMA process, dissolved oxygen (O2) was continuously activated by zero-valent iron (Fe0) to produce reactive oxygen species (ROS) at ambient pH, temperature, and pressure. Concurrently, iron sludge was generated as a result of iron corrosion. Bench-scale tests were conducted to study the performance of IMA for treatment of secondary effluent, natural surface water, and simulated contaminated water. The following removal efficiencies were achieved: 82.2% glyoxylic acid, ∼100% formaldehyde as an oxidation product of glyoxylic acid, 94% of Ca2+ and associated alkalinity, 44% of chemical oxygen demand (COD), 26% of electrical conductivity (EC), 98% of di-n-butyl phthalate (DBP), 80% of 17β-estradiol (E2), 45% of total nitrogen (TN), 96% of total phosphorus (TP), 99.8% of total Cr, >90% of total Ni, 99% of color, 3.2 log removal of total coliform, and 2.4 log removal of E. Coli. Removal was attributed principally to chemical oxidation, precipitation, co-precipitation, coagulation, adsorption, and air stripping concurrently occurring during the IMA treatment. Results suggest that IMA is a promising treatment technology for water reuse.

Original languageEnglish
Pages (from-to)850-858
Number of pages9
JournalWater Research
Volume47
Issue number2
DOIs
StatePublished - 1 Feb 2013

Keywords

  • Adsorption
  • Coagulation
  • Dissolved oxygen
  • Iron
  • Oxidation
  • Water reuse

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