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MS2 coliphage inactivation by Al/Fe PILC-activated Catalytic Wet Peroxide Oxidation: multiresponse statistical
Alejandra Ordoñez-Ordoñez1,2, Dolly M Revelo-Romo2, Ana M Garcia-Mora1
1Grupo de Investigación en Materiales Funcionales y Catálisis (GIMFC), Departamento de Química, Universidad de Nariño, Pasto, 520002, Colombia.
Heliyon
|July 12, 2019
Summary
This study optimized Catalytic Wet Peroxide Oxidation (CWPO) using Al/Fe-pillared clay to inactivate MS2 coliphage in water. Optimal conditions achieved 92.9% MS2 inactivation and 100% H2O2 utilization, demonstrating effective water purification.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
- Catalysis
Background:
- Natural organic matter (NOM) interferes with water disinfection processes.
- MS2 coliphage is a common surrogate for viral indicators in water.
- Catalytic Wet Peroxide Oxidation (CWPO) is a promising advanced oxidation process for water treatment.
Purpose of the Study:
- To optimize CWPO using Al/Fe-pillared clay (Al/Fe-PILC) for MS2 coliphage inactivation.
- To investigate the impact of H2O2 dose and catalyst concentration on CWPO efficiency.
- To evaluate the influence of NOM and operational parameters (pH, temperature) on the process.
Main Methods:
- Response Surface Methodology (RSM) was employed to study the simultaneous effects of controllable and uncontrollable variables.
- Key factors investigated included H2O2 dose, Al/Fe-PILC catalyst concentration, pH, temperature, NOM concentration, and MS2 titer.
- Multiple responses were modeled and maximized: MS2 inactivation, H2O2 utilization, decolourization, and NOM mineralization.
Main Results:
- Multi-response optimization using a desirability function achieved excellent fitting (0.94).
- Optimal conditions identified: 0.33 g Al/Fe-PILC/L, 3.36% H2O2 dose, pH 7.07, 25°C, 16.06 mg C/L NOM, and 10^6 PFU/mL MS2 titer.
- These conditions resulted in 92.9% MS2 inactivation and 100% H2O2 reacted within 70 minutes.
Conclusions:
- The Al/Fe-PILC catalyst effectively enhances CWPO for MS2 coliphage inactivation.
- Optimized CWPO process demonstrates high efficiency in removing viral surrogates in the presence of NOM.
- The study provides a robust framework for optimizing advanced oxidation processes for water purification.
Keywords:
Al/Fe-pillared clayAnalytical chemistryApplied chemistryApplied microbiologyCWPODrinking water qualityEnvironmental chemistry processesEnvironmental scienceEnvironmental technologyMS2 coliphageMaterials chemistryMicrobiologyNanotechnologyNatural hazardsResponse surface methodologyStatistical optimizationWater disinfectionWater pollution treatment
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