Comparison between HPSEC-OCD and F-EEMs for assessing DBPs formation in water
Euis Nurul Hidayah1, Yung-Chen Chou1, Hsuan-Hsien Yeh1
1a Department of Environmental Engineering , National Cheng Kung University , Tainan , Taiwan.
Summary
Potassium permanganate preoxidation breaks down natural organic matter into smaller molecules, aiding removal during water treatment. This helps identify organic precursors for disinfection by-products, improving treatment strategies.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
- Analytical Chemistry
Background:
- Natural organic matter (NOM) in source water influences the formation of disinfection by-products (DBPs).
- Potassium permanganate (KMnO4) preoxidation is a common water treatment step.
- Characterizing NOM is crucial for effective DBP control.
Purpose of the Study:
- To characterize NOM in source and treated water after KMnO4 preoxidation and coagulation.
- To identify the main organic fractions responsible for DBP formation.
- To develop predictive models for DBP formation potential.
Main Methods:
- High-performance size exclusion chromatography with organic carbon detection (HPSEC-OCD).
- Fluorescence excitation-emission matrices (F-EEMs) with parallel factor (PARAFAC) analysis.
- Analysis of bulk parameters like dissolved organic carbon (DOC) and UV254 absorbance.
Main Results:
- KMnO4 preoxidation decreased high molecular weight organics and increased low molecular weight organics.
- Coagulation partially removed both original and KMnO4-generated organic matter.
- Humic substances were identified as the primary organic composition.
- Predictive models for trihalomethane (THM) and haloacetic acid (HAA) formation potential were more accurate using HPSEC-OCD data than PARAFAC data.
Conclusions:
- HPSEC-OCD and F-EEMs with PARAFAC are effective for NOM characterization.
- KMnO4 preoxidation alters NOM characteristics, impacting its removal and DBP formation potential.
- Predictive models based on HPSEC-OCD fractions offer a valuable tool for identifying DBP precursors and optimizing water treatment for DBP control.
Related Concept Videos
01:30Capillary Electrophoresis: Applications
1.6K
Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
1.6K
01:24Electrochemical Systems
43
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
43