Performance evaluation of different solar advanced oxidation processes applied to the treatment of a real textile dyeing wastewater

Environ Sci Pollut Res Int. 2015 Jan;22(2):833-45. doi: 10.1007/s11356-014-2767-1. Epub 2014 Apr 16.

Abstract

The performance of different solar-driven advanced oxidation processes (AOPs), such as TiO2/UV, TiO2/H2O2/UV, and Fe(2+)/H2O2/UV-visible in the treatment of a real textile effluent using a pilot plant with compound parabolic collectors (CPCs), was investigated. The influence of the main photo-Fenton reaction variables such as iron concentration (20-100 mg Fe(2+) L(-1)), pH (2.4-4.5), temperature (10-50 °C), and irradiance (22-68 WUV m(-2)) was evaluated in a lab-scale prototype using artificial solar radiation. The real textile wastewater presented a beige color, with a maximum absorbance peak at 641 nm, alkaline pH (8.1), moderate organic content (dissolved organic carbon (DOC) = 129 mg C L(-1) and chemical oxygen demand (COD) = 496 mg O2 L(-1)), and high conductivity mainly associated to the high concentration of chloride (1.1 g Cl(-) L(-1)), sulfate (0.4 g SO 4 (2 -) L(- 1)), and sodium (1.2 g Na(+) L(-1)) ions. Although all the processes tested contributed to complete decolorization and effective mineralization, the most efficient process was the solar photo-Fenton with an optimum catalyst concentration of 60 mg Fe(2+) L(-1), leading to 70 % mineralization (DOCfinal = 41 mg C L(-1); CODfinal < 150 mg O2 L(-1)) at pH 3.6, requiring a UV energy dose of 3.5 kJUV L(-1) (t 30 W = 22.4 min; [Formula: see text]; [Formula: see text]) and consuming 18.5 mM of H2O2.

Publication types

  • Comparative Study
  • Evaluation Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biological Oxygen Demand Analysis
  • Chlorides
  • Hydrogen Peroxide / chemistry*
  • Hydrogen-Ion Concentration
  • Industrial Waste / analysis
  • Iron / chemistry*
  • Oxidation-Reduction
  • Photolysis*
  • Pilot Projects
  • Sunlight
  • Temperature
  • Textiles
  • Titanium / chemistry*
  • Waste Disposal, Fluid / methods*
  • Wastewater / analysis
  • Water Pollutants, Chemical / chemistry
  • Water Purification / methods*

Substances

  • Chlorides
  • Fenton's reagent
  • Industrial Waste
  • Waste Water
  • Water Pollutants, Chemical
  • titanium dioxide
  • Hydrogen Peroxide
  • Titanium
  • Iron