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Applications of Fenton and Fenton-like Reactions for De-rusting Wastewater Treatment

BURAPHA UNIVERSITY FACULTY OF ENGINEERING. Applications of Fenton and Fenton-like Reactions for De-rusting Wastewater Treatment. Mr. Piseth Som (55910117) Degree Program in Chemical and Environmental Engineering 31 August 2013. Content. Introduction Theoretical and Empirical Reviews

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Applications of Fenton and Fenton-like Reactions for De-rusting Wastewater Treatment

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  1. BURAPHA UNIVERSITY FACULTY OF ENGINEERING Applications of Fenton and Fenton-like Reactions for De-rusting Wastewater Treatment Mr. PisethSom (55910117) Degree Program in Chemical and Environmental Engineering 31 August 2013

  2. Content Introduction Theoretical and Empirical Reviews Materials and Methods Expected Results Research Time Frame

  3. Introduction • Application of Chelating agents (EDTA, Citric Acid...)in industries: • Metal production • Detergent • Cleaning process (Boilers, Tanks, Pipes) • Environmental concerns over utilization of chelating agents (EDTA) • Mental-Complexation • Mobilization of Heavy Metals (Ni, Pb, As, Fe, ...) • Eutrophication Driven Substance (Lan et al. (2012)

  4. Chelatedcomplexation negatively impact on • Iron Exchange • Chemical Precipitation • Biological Processes • Adsorption (Fu et al., 2009, &2012) • Therefore, treatment methods are scanned and searched

  5. Possibility of Advanced Oxidation Processes (AOP) • Degradation of variety of organic compounds • Cost effectiveness • Ease of application (Poyatos et al., 2010) • Most common application of Fenton reaction and Fenton-like reaction among other AOPs for industrial wastewater (Bautista et al., 2008)

  6. Ease of application, Biodegradability improvement and detoxification App. of Fenton and Fenton-like reactions for De-rusting wastewater is NOT well documented Controversy of Chelating agents in Fenton reaction Rational NiEDTA and CuEDTA were conducted but FeEDTA is not well document • Presence of Chelating Agents (EDTA) results in inapplicability for conventional process Utilization of existing Ferrous/Ferric ion in Wastewater

  7. Cleaning Processes (Pipe, boilers, Tanks,...) Cleaning Solution ( EDTA, NaOH, DTS, Ammonia) Mixed Wastewater (COD, Metal, EDTA waste...) • Problem for • Ion Exchange • Precipitation • Coagulation • Adsorption • Biological Method Metal-EDTA complex, Fe2+ /Fe3+ Fenton and Fenton-like Reactions Fe2+ /Fe3+ + H2O2 HO • Destruct EDTA • Free Iron/ Metal Precipitation M(OH)n/ Fe(OH)3

  8. Scope and Limitation • Real De-rusting (cleaning) Wastewater is used • Jar Test Apparatus is conducted at laboratory room temperature at DChE, BUU • Objective Parameters: COD and Total Iron, Turbidity, TSS, TDS • Kinetic degradation organic chelating agents are monitored in term of COD • Fonton Oxidation Products are not monitored

  9. Objective Parameters = f ( pH, Temp-, [Fe2+],[ Fe3+], [H2O], RT, Mixing Speed) Independent Variables: COD, Total Iron, TDS, TSS, Turbidity Dependent Variables: pH, [Fe2+],[ Fe3+], [H2O], Reaction Time Control Variables: Temp- , mixing speed and wastewater characteristics

  10. Theoretical and Empirical Reviews

  11. Theoretical and Empirical Reviews • Discovered by Mr. Fenton in 1894 : mixture of Fe2+ with H2O2 in acidic condition • Advanced Oxidation Processes based on Fenton Reaction are well-known for • Ability in degradation of varirous organic compounds • Ease of application • Cost Effective • Biodegradability Improvement (COD/BOD ratio) • POPs degradation

  12. RH +•OH → R•+ H2O + CO2 RH + •OH → (OH)RH• RH + •OH → (RH)• + + OH−

  13. Fe2+ + H2O2 → Fe3+ + OH•+ OH− (Fenton oxidation) Fe3++ H2O2 → Fe2+ + HO2•+ OH− (Fenton-like reaction) Scavenging effects results from overdoing of [H2O2 ] and Fe2+/3+ in the system Fe2++•OH → Fe3++ OH− Fe2+ + HO2• → Fe3+ + HO2− Fe3+ + HO2• → Fe2++ H+ + O2 H2O2+ •OH → HO2• + H2O

  14. Factor Effecting Fenton and Fenton-like Reaction • pH suitable with 3-6 • At low pH  decompose H2O2into O2and H2Oby Fe2+ and reaction between •OH and H+ occurs (Neyens & Baeyens, 2003) • At high pH  Precipitate Fe(OH)3  decompose H2O2into O2and H2O2 without •OH and stable Fe-complex is formed (Bautista et al.,2007&2008)

  15. 2004 2005 2009 2010 2012 2013

  16. Research Method • Cleaning Wastewater • Pipe, boilers, and tanks cleaning processes • Kation Power Company in Rayong Province

  17. Wastewater ZVI + 35% w/w H2O2 , 150 rpm for 60 min Jar Test Apparatus H2SO4 adjust pH 3 NaOH adjust pH11.5 Fe COD TSS TDS turbidity Settling for 15 min 80 rpm for 10 min

  18. It is expected to • optimum condition • Organic reduction and degradation • Signeficance of Operating parameters • degradable Products Monitoring??? • Kinetic of Organic Reduction in term of COD? • Discussion of Other Parameters and Its Condition affected by Fenton and Fenton Like? • What is the differences between Fenton (using Ferrous) and Fenton-like(using Ferric) ? • How fast did each Wastewater parameter degraded according to the Kinetic order ( why First and Why Second) • What is EDTA situation aftern Fenton and Fenton-like Oxidaton

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