Peroxone mineralization of chemical oxygen demand for direct potable water reuse: Kinetics and process control

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Mineralization of organics in secondary effluent by the peroxone process was studied at a direct potable water reuse research treatment system serving an occupied four-bedroom, four bath university residence hall apartment. Organic concentrations were measured as chemical oxygen demand (COD) and kinetic runs were monitored at varying O3/H2O2 dosages and ratios. COD degradation could be accurately described as the parallel pseudo-1st order decay of rapidly and slowly-oxidizable fractions, and effluent COD was reduced to below the detection limit (<0.7mg/L). At dosages ≥4.6mgL-1h-1, an O3/H2O2 mass ratio of 3.4-3.8, and initial COD <20mg/L, a simple first order decay was indicated for both single-passed treated wastewater and recycled mineral water, and a relationship is proposed and demonstrated to estimate the pseudo-first order rate constant for design purposes. At this O3/H2O2 mass ratio, ORP and dissolved ozone were found to be useful process control indicators for monitoring COD mineralization in secondary effluent. Moreover, an average second order rate constant for OH oxidation of secondary effluent organics (measured as MCOD) was found to be 1.24×107±0.64×107M-1S-1. The electric energy demand of the peroxone process is estimated at 1.73-2.49kWh electric energy for removal of one log COD in 1m3 secondary effluent, comparable to the energy required for desalination of medium strength seawater. Advantages/disadvantages of the two processes for municipal wastewater reuse are discussed.

Original languageEnglish
Pages (from-to)362-372
Number of pages11
JournalWater Research
Volume73
DOIs
StatePublished - Apr 5 2015

Keywords

  • COD mineralization
  • Energy cost
  • Net zero water treatment
  • Peroxone
  • Potable reuse
  • Process control

ASJC Scopus subject areas

  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Ecological Modeling

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