Abstract
AbstractTo enable the evaluation of water treatment efficiency of electrochemical advanced oxidation processes (EAOPs), an approach to remove H2O2 as a catalytic pretreatment was investigated to av...
Highlights
Chemical oxygen demand (COD) remains one of the most important parameters in determining the degradation of organic matter (OM) during wastewater treatment and, in evaluating treatment efficiency required by water regulations
These results demonstrate the need for a uniform experimental approach to remove H2O2 from wastewater samples without changing COD
At ambient temperature (∼20°C), a reaction time of 24 h was needed for complete selective H2O2 decomposition, while 70°C was identified as a good alternative for efficient H2O2 decomposition within 60 min
Summary
Chemical oxygen demand (COD) remains one of the most important parameters in determining the degradation of organic matter (OM) during wastewater treatment and, in evaluating treatment efficiency required by water regulations. The optical colorimetric method, via spectrophotometry (Barid et al 2017), is used for COD analysis because it is rapid and simple and can be automated (Ying et al 2006). In this method, potassium dichromate acts as an oxidizing agent in COD test cuvettes whereby organic substances of wastewater samples are mineralized to CO2 and H2O. The measured absorbance is directly proportional to the amount of oxidized matter determined as COD (Weiner and Matthews 2003). The use of hydrogen peroxide (H2O2) for water and wastewater (WW) treatment and industrial water reuse by advanced oxidation processes (AOPs) to oxidize (recalcitrant) organic compounds
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