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Advanced Oxidation Processes (AOPs)
Basic Principle

Advanced Oxidation Process (AOP) is a chemically method for wastewater treatment that has been developed in last decades. This process is very effective in oxidation, decolorization, mineralization and degradation of organic pollutant (Mohajerani et al., 2009). Advanced Oxidation Process (AOP) is promising technology to treat wastewater containing organic pollutant that is not easy to be removed. AOP is known to have high efficiency in treating recalcitrant compound in wastewater. AOP process involves hydroxyl radical forming that has very high oxidation potential and able to oxidize almost every organic pollutant compound non selectively (Del Moro et al., 2013).

AOP procedures are very useful to remove toxic or non-degradable biological material such as, aromatics, pesticides, petroleum constituents, and volatile organic compounds in wastewater. Contaminants are converted mostly into stable inorganic compounds, such as water, carbon dioxide and salt.

The objective of wastewater purification with AOP procedure is to reduce chemical contaminants and toxicants that will be discharged into water body or at least continue to conventional wastewater treatment. The main mechanism of AOP is free radical forming which is very reactive. Hydroxyl radical (OH•) is effective in degrade chemical organic compound because they are electrophilic reactive that react quickly and non-selectively with almost all organics that electron-rich compound.  They have oxidation potential 2.33 V and show the oxidation level is faster than the conventional oxidant such as hydrogen peroxide (H2O2) or KMnO4 (Sharma et al., 2011). Reaction that occurs in AOP process is as follows:

AOPs → OH* + pollutant → CO2 + H2O + inorganic ion

The above reaction shows that AOP technology can produce complete mineralization from pollutant become CO2, H2O, and inorganic materials. Generally, partial decomposition process from organic pollutant that not degraded by biologically treatment can degraded by AOP.

Types of AOP
AOP refers to a set of chemical treatment procedures that designed to eliminate organic and inorganic materials in wastewater by oxidation. Contaminants oxidized by many types of reagents such as Ozone (O3), hydrogen peroxide (H2O2), oxygen, and air with dosage and the right combination and programmed. Various methods of AOP that have been widely studied for pollutant treatment are AOP with Ozone (O3), Ozone combined with UV (O3/UV), Ozone combined with Hydrogen Peroxide (O3/H2O2), Hydrogen Peroxide with UV (UV/H2O2), Fenton (Fe2+) and Titanium Dioxide Photocatalyst that is combined with UV and Oxygen (TiO2/UV) (Esplugas, Santiago et al., 2002).

PT. Enerba Teknologi is using AOP technology in combination of Ozone (O3), Hydrogen Peroxide (H2O2) and UV light to handle wastewater treatment problems that not easy to treat with conventional treatment. We always do the experiment prior to the case of wastewater to be processed to ensure the results in accordance with customer expectations.

REFERENCES

Del Moro et al. 2013. Comparison of UV/H2O2 based AOP as an End Treatment or Integrated with Biological Degradation for Treating Landfill Leachates. Chemical Engineering Journal 218 (2013) 133-137

Esplugas, S. (2002) : Comparison of Different Advanced Oxidation Processes for Phenol Degradation. Water Research, 36, 1034-1042.

Kommineni, S., Zoeckler, J., Stocking, A., Liang, S., Flores, A., Kavanaugh, M., et al. (2000) : Treatment Technologies for Removal of Methyl Tertiery Butyl Ether (MTBE) from Drinking Water : Advanced Oxidation Processes (2nd Ed). Diakses April 8, 2015, from The California MTBE Research Partnership, National Water Research Institute

Muruganandham, M., Suri, R., Jafari, S., Sillanpaa, M., Lee, G., Wu, J., et al. (2014) : Recent Developments in Homogeneous Advanced Oxidation Processes for Water and Wastewater Treatment: Review. International Journal of Photoenergy, 2014, 1-21.

Mohajerani, M., Mehrvar, M., dan Mozaffari, F.E. 2009. An Overview of The Integration pf Advanced Oxidation Technologies and Other Processes for Water and Wastewater Treatment. (International Journal of Engineering) Vol. 3 : Issue 2 (2009)

Sharma et al. 2011. A General Review on Advanced Oxidation Processes for Waste Water Treatment. Institute of Technology, Nirma University, Ahmedabad-382 481

 
 
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