Abstract
Different advanced oxidation processes (AOPs) were applied to the treatment of a real cotton-textile dyeing wastewater as a pre-oxidation step to enhance the biodegradability of the recalcitrant compounds, which can be further oxidized using a biological process. Tests were conducted on a lab-scale prototype using artificial solar radiation and at pilot scale with compound parabolic collectors using natural solar radiation. The cotton-textile dyeing wastewater presents a lilac color, with a maximum absorbance peak at 641 nm, alkaline pH (pH = 8.2), moderate organic content (DOC = 152 mg C L−1, COD = 684 mg O2 L−1) and low-moderate biodegradability (40 % after 28 days in Zahn–Wellens test). All the tested processes contributed to an effective decolorization and mineralization, but the most efficient process was the solar-photo-Fenton with an optimum catalyst concentration of 60 mg Fe2+ L−1, leading to 98.5 % decolorization and 85.5 % mineralization after less than 0.1 and 5.8 kJUV L−1, respectively. In order to achieve a final wastewater with a COD below 250 mg O2 L−1 (discharge limit into water bodies imposed by the Portuguese Legislation-Portaria no. 423/97 of 25 June 1997), considering the combination of a solar-photo-Fenton reaction with a biological process, the phototreatment energy required is 0.5 kJUV L−1, consuming 7.5 mM hydrogen peroxide, resulting in 58.4 % of mineralization \( \left({t}_{30\mathrm{W}}=3.2\ \min; \overline{T}=30.7\ {}^{\circ}\mathrm{C};\overline{\mathrm{pH}}=2.80;{\overline{\mathrm{UV}}}_{G,n}={13\ \mathrm{W}\ \mathrm{m}}^{-2}\right). \)








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- Δt n :
-
Time period (s)
- A CPC :
-
Compound parabolic collector area (m2)
- AOP:
-
Advanced oxidation process
- A r :
-
Illuminated collector surface area (m2)
- BOD5 :
-
Biochemical oxygen demand (mg O2 L−1)
- C A :
-
Dissolved organic carbon in the sample after 3 h the beginning of the Zahn–Wellens test (in milligram carbon per liter)
- C BA :
-
Dissolved organic carbon in the blank after 3 h the beginning of the Zahn–Wellens test (in milligram carbon per liter)
- C B :
-
Dissolved organic carbon in the blank, measured at the sampling time t, of the Zahn–Wellens test (in milligram carbon per liter)
- COD:
-
Chemical oxygen demand (in milligram oxygen per liter)
- COS:
-
Carbon oxidation state (dimensionless)
- CPC:
-
Compound parabolic collector
- C t :
-
Dissolved organic carbon in the sample, measured at the sampling time t, of the Zahn–Wellens test (in milligram carbon per liter)
- DOC:
-
Dissolved organic carbon (in milligram carbon per liter)
- DOC0 :
-
Initial dissolved organic carbon (in milligram carbon per liter)
- D t :
-
Percentage of biodegradation (in percent)
- I :
-
Average irradiation intensity (in watt per square meter)
- k :
-
Pseudo-first order kinetic constant (in liter per kilojoule)
- k H :
-
Hydrogen peroxide consumption rate (in millimole per kilojoule)
- LMCA:
-
Low-molecular-weight carboxylate anions (in milligram carbon per liter)
- QUV :
-
Accumulated ultraviolet energy (in kilojoule per liter)
- \( \overline{ pH} \) :
-
Average pH (Sorensen scale)
- r 0 :
-
Initial dissolved organic carbon reaction rate (mg kJ−1)
- SFM:
-
Six-flux absorption scattering model
- SUNTEST:
-
Solar radiation simulator
- \( \overline{T} \) :
-
Average temperature (in degrees Celsius)
- t 30 W :
-
Typical solar UV power on a perfectly sunny day around noon (in minute)
- t dark :
-
Dark time (in second)
- t i :
-
Illuminated time (in second)
- t n :
-
Time corresponding to n-water sample (in second)
- TSS:
-
Total suspended solids (in milligram per liter)
- \( {\overline{ UV}}_{G\ n} \) :
-
Average solar ultraviolet radiation intensity (in watt per square meter)
- V i :
-
Illuminated reactor volume (in liter)
- VSS:
-
Volatile suspended solids (in milligram per liter)
- V t :
-
Total reactor volume (in liter)
- WWTP:
-
Wastewater treatment plant
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Acknowledgments
This work was partially supported by project PEst-C/EQB/LA0020/2011, financed by FEDER through COMPETE—Programa Operacional Factores de Competitividade and by FCT—Fundação para a Ciência e a Tecnologia. Petrick A. Soares and Diego R. Manenti acknowledge their Ph.D. fellowships (BEX 5512-10-7 and 9794-11-5) supported by CAPES. Tânia Silva also wants to acknowledge her Ph.D. scholarship, reference SFRH/BD/73510/2010, supported by FCT. Vítor Vilar acknowledges Ciência 2008 Program.
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Soares, P.A., Silva, T.F.C.V., Manenti, D.R. et al. Insights into real cotton-textile dyeing wastewater treatment using solar advanced oxidation processes. Environ Sci Pollut Res 21, 932–945 (2014). https://doi.org/10.1007/s11356-013-1934-0
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DOI: https://doi.org/10.1007/s11356-013-1934-0


