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Treatment of triethyl phosphate wastewater by Fenton oxidation and aerobic biodegradation
- Source :
- The Science of the total environment. 678
- Publication Year :
- 2019
-
Abstract
- The conventional (i.e., aerobic biodegradation) and advanced (i.e., Fenton oxidation) treatment methods with implementation potentials were in parallel investigated for the treatment of industrial wastewater rich in organic phosphorus (Org.-P, dominated by triethyl phosphate (TEP)). Fenton effectively reduced Org.-P from 58 to 5 mg/L under the optimal reaction conditions of 20 mM H2O2, 14 mM Fe2+, pH 3.0, 120 mins' reaction time and the continuous dosing method (N = 4), following the first order kinetic model with a reaction rate constant of 0.07 min−1. Nevertheless, the pretreatment prior to Fenton reaction (e.g., desalination) is recommended since high salinity significantly hindered TEP degradation, possibly due to the formation of Fe-Cl complexation and its scavenging effect to ∙OH. The Org.-P mineralization rate of ~98% was achieved by aerobic biodegradation. The excellent performance was maintained up to a salinity of 4.6% (w/w), higher than which the mineralization was seriously deteriorated. The high salinity could inhibit the microbial growth. This property might be responsible for the insufficient Org.-P removal during the on-site wastewater biological treatment. The Org.-P and COD concentrations were 6 and 405 mg/L respectively after the realistic wastewater treatment by biodegradation and coagulation, which meets with the municipal sewer discharge standard (GB/T 31962-2015).
- Subjects :
- Environmental Engineering
010504 meteorology & atmospheric sciences
010501 environmental sciences
Wastewater
01 natural sciences
Waste Disposal, Fluid
Industrial wastewater treatment
chemistry.chemical_compound
Reaction rate constant
Environmental Chemistry
Waste Management and Disposal
0105 earth and related environmental sciences
Triethyl phosphate
Mineralization (soil science)
Hydrogen Peroxide
Biodegradation
Pollution
Aerobiosis
Organophosphates
Waste treatment
Kinetics
Biodegradation, Environmental
chemistry
Environmental chemistry
Sewage treatment
Oxidation-Reduction
Water Pollutants, Chemical
Subjects
Details
- ISSN :
- 18791026 and 19622015
- Volume :
- 678
- Database :
- OpenAIRE
- Journal :
- The Science of the total environment
- Accession number :
- edsair.doi.dedup.....ca9f9b7bd50dc4fc2cf474252b5d9143