Advanced Treatment of Secondary Sewage Effluent by Iron-Carbon Internal Electrolysis

Abstract:

Due to increasing water scarcity, appropriate technologies were need for advanced treatment of wastewater to enable reuse. Effect of iron-carbon internal electrolysis in tertiary treatment of wastewater was investigated in this study. Static experiment was adopted to evaluate influence of Fe/C ratio, pH, reaction time and aeration on pollutant removal by iron-carbon internal electrolysis. Then dynamic experiment was conducted to determine removal rate of CODcr, TP, chroma and NO₃^--N. The results showed that internal electrolysis could remove COD_cr, TP and chroma efficiently. The optimal ratio of Fe/C was 1:1. Initial pH could affect removal efficiency. In acid circumstance, the removal rate was higher. Degradation reaction by internal electrolysis was fast. when the reaction time was 10min, the removal rate could be ideal. In the process of internal electrolysis, aeration could increase pollutant removal rate. In aerated system, when the reaction time was only 15min, removal rate of COD_cr, TP and chroma could reach 49.2%, 89% and 75%. But in non-aerated system, only when the reaction time was 100min could removal rate of these indexes reach 46.5%, 81% and 85.1%. In dynamic experiment, removal rate of COD_cr, TP, chroma and NO₃- could reach above 40%, 90%, 75% and 20%, respectively.

• Periodical: Advanced Materials Research (Volumes 183-185)
• Pages: 291-295
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.183-185.291
• Online since: January 2011
• Authors: Li Hua Cheng, Xue Jun Bi, Chang Qing Liu
• Keywords: Advanced Sewage Treatment, Aeration, Carbon, Internal Electrolysis, Iron, Removal Rate

References

[1] James Farrell et al. Investigation of the Long-Term Performance of Zero-Valent Iron for Reductive Dechlorination of Trichloroethylene. Environ. Sci. Technol. Vol. 34 (2000), p.514.

DOI: 10.1021/es990716y

[2] Joseph N. Fiedor et al. Understanding the Mechanism of Uranium Removal from Groundwater by Zero-Valent Iron Using X-ray Photoelectron Spectroscopy. Environ. Sci. Technol. Vol. 32 (1998), p.1466.

DOI: 10.1021/es970385u

[3] Charlotte Scheuze et al. Removal of Halogenated Organic Compounds in Landfill Gas by Top Covers Containing Zero-Valent Iron. Environ. Sci. Technol. Vol. 34 (2000), p.2557.

DOI: 10.1021/es991301f

[4] Young-Hun Kim et al. Dechlorination of Pentachlorophenol by Zero Valent Iron and Modified Zero Valent Irons. Environ. Sci. Technol. Vol. 34 (2000), p. (2014).

DOI: 10.1021/es991129f

[5] Zhou Qunying, Zhang Desheng, Gao Tingyao. Study on Micro-electrolysis Bactericide under Flow Condition. Shanghai Environmental Science, Vol. 17, No. 2 (1998), p.36.

[6] Sun Hua, Hong Ying, Gao Tingyao, et al. A Test on the Treatment of Waste Water from Dye-Stuff Production by Internal Electrolysis. Industrial Water & Wastewater, Vol. 3, No. 32 (2001), p.22.

[7] LiuJianping, Zhou Rongfeng, Gao Tingya. Decolorization of Orange II Containing Wastewater by Fe-Cu Internal Electrolysis. Environmental Protection of Chemical Industry Vol. 24, No. 6 (2004), p.391.

[8] Changha Lee, Christina R. Keenan, David L. Sedlak. Polyoxometalate-Enhanced Oxidation of Organic Compounds by Nanoparticulate Zero-Valent Iron and Ferrous Ion in the Presence of Oxygen. Environ. Sci. Technol. Vol. 42 (2008), p.4921.

DOI: 10.1021/es800317j

[9] Tamara E. Shokes and Gregory Moller. Removal of Dissolved Heavy Metals from Acid Rock drainage Using Iron Metal. Environ. Sci. Technol. Vol. 33 (1999), p.282.

DOI: 10.1021/es980543x

[10] Zhaohui Li. et al. Enhanced Reduction of Chromate and PCE by Pelletized Surfactant-modified Zerolite/Zerovalent Iron. Environ. Sci. Technol. Vol. 33 (1999), p.4326.

DOI: 10.1021/es990334s