A Study on the Removal of Natural Organic Matter and Disinfection Byproducts Formation Potential from Groundwater Using Fenton’s Process

2011 ◽  
Vol 14 (1) ◽  
Author(s):  
Jelena J. Molnar ◽  
Jasmina R. Agbaba ◽  
Božo D. Dalmacija ◽  
Srđan D. Rončević ◽  
Snežana P. Maletić ◽  
...  
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Disinfection Byproducts ◽  
Haloacetic Acids ◽  
Fenton Process ◽  
Real Matrix ◽  
Reaction Conditions ◽  
Optimum Reaction ◽  
Fenton's Process

AbstractThis work investigates the efficiency of the Fenton process in removing natural organic matter (NOM) from groundwater. Previous studies focused mostly on the use of Fenton’s process to remove total organic matter, but this research also studies the conditions leading to the formation of hazardous disinfection by-product precursors, and their removal. Solutions of a commercial humic acid as a model of NOM and natural groundwater as a real matrix rich in NOM (dissolved organic carbon, DOC=9.92±0.87 mg/L) were studied. Under optimum reaction conditions, the respective removal efficiencies (expressed as DOC) were 95% from commercial humic acid solution and 82% from groundwater. The decrease in DOC resulted in 99% decrease of the content of precursors of trihalomethanes (THMs) and 98% of haloacetic acids (HAAs) for the investigated matrixes. Precursors of haloacetonitriles, haloketones and chloropicrin were detected at much lower concentrations than the THMs and HAAs precursors.

scholarly journals Removal of natural organic matter from groundwater using fenton’s process

2013 ◽  
Vol 15 (1) ◽  
pp. 13-20 ◽  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Organic Contaminants ◽  
Ph Value ◽  
Research Performance ◽  
Drinking Water Treatment ◽  
Disinfection Byproducts ◽  
Water Disinfection ◽  
Trihalomethane Formation Potential ◽  
Fenton's Process

Groundwater in the area of eastern Croatia contains increased concentrations of organic compounds, primarily natural organic matter (NOM). Organic compounds in water become a problem in drinking water treatment, especially during water disinfection with chlorine, when harmful disinfection by-products like trihalomethanes appear. Therefore, the removal of disinfection byproducts (DBP) precursors gains high importance. This paper deals with the efficiency of NOM removal from groundwater by the Fenton’s process and its influence on trihalomethane formation potential (THMFP). In this research performance of Fenton process at conditions close to conditions of natural groundwater was investigated. pH value was not decreased under 4.5 and attempt was done to perform Fenton’s process at natural iron concentration in groundwater of town Osijek area. Once optimized, process achieved about 50 % removal of TOC (2.5 mM H2O2; 0.1 mM Fe2+; pH 4.5) and decrease of THMFP (A254/A203) for about 70 % (5 mM H2O2; 0.1 mM Fe2+; pH 4.5). Under adequate conditions Fenton process could be successfully used for the removal of organic contaminants from groundwater.

Quantifying the formation of nitrogen-containing disinfection by-products in chlorinated water using absorbance and fluorescence indexes

2011 ◽  
Vol 63 (1) ◽  
pp. 40-44 ◽  
Author(s):  
P. Roccaro ◽  
F. G. A. Vagliasindi ◽  
G. V. Korshin
Keyword(s):  
Organic Matter ◽  
Reaction Time ◽  
Real Time ◽  
Natural Organic Matter ◽  
Haloacetic Acids ◽  
Real Time Monitoring ◽  
Potential Toxicity ◽  
Reaction Conditions ◽  
Drinking Waters ◽  
By Products

Among known but unregulated disinfection by-products (DBPs), several nitrogenous species (N-DBPs) have been found in drinking waters. While concentrations of N-DBP are much lower than those of trihalomethanes (THMs) and haloacetic acids (HAAs), their potential toxicity is higher. In this study the relationships between the formation of N-DBPs and the changes in NOM caused by the chlorination of raw Ancipa water quantified by the use of differential absorbance and fluorescence indexes were investigated. Very strong relationships were found between selected N-DBPs (i.e. trichloronitromethane and dichloroacetonitrile) and the proposed spectroscopic indexes that were previously developed to quantify the changes in natural organic matter (NOM) during chlorination at varying reaction conditions (chlorine dose, reaction time and temperature) and the generation of DBPs. Obtained results clearly indicate that the changes in NOM absorbance and fluorescence are fundamental descriptors of the formation of both commonly controlled halogenated DBPs and N-DBPs. This approach may be suitable for real time monitoring of emerging N-DBPs and for studying their formation pathways.

Characterization of dissolved organic matter (DOM) extracted from soils by hot water percolation (HWP)

2010 ◽  
Vol 59 (1) ◽  
pp. 99-108 ◽  
Author(s):  
M. Takács ◽  
Gy. Füleky
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Extraction Methods ◽  
Soil Samples ◽  
Hot Water ◽  
Soil Extracts ◽  
Water Percolation ◽  
Soil Humic Acid

The Hot Water Percolation (HWP) technique for preparing soil extracts has several advantages: it is easily carried out, fast, and several parameters can be measured from the same solution. The object of this study was to examine the possible use of HWP extracts for the characterization of soil organic matter. The HPLC-SEC chromatograms, UV-VIS and fluorescence properties of the HWP extracts were studied and the results were compared with those of the International Humic Substances Society (IHSS) Soil Humic Acid (HA), IHSS Soil Fulvic Acid (FA) and IHSS Suwannee Natural Organic Matter (NOM) standards as well as their HA counterparts isolated by traditional extraction methods from the original soil samples. The DOM of the HWP solution is probably a mixture of organic materials, which have some characteristics similar to the Soil FA fractions and NOM. The HWP extracted organic material can be studied and characterized using simple techniques, like UV-VIS and fluorescence spectroscopy.

Effects of Natural Organic Matter on TCE Removal in Groundwater by Zero-Valent Iron: Batch Study

2013 ◽  
Vol 807-809 ◽  
pp. 486-489
Author(s):  
Tong Zhou Liu ◽  
Pin Hua Rao
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Early Stage ◽  
Organic Contaminant ◽  
Zero Valent Iron ◽  
Contaminant Removal ◽  
Inhibitory Effects ◽  
Batch Study

An investigation on the effects of humic acid (representing NOM) on TCE (a typical organic contaminant) removal by Fe0in batch settings was carried out. Inhibitory effects of humic acid on Fe0towards TCE removal were observed. At early stage of the experiments, humic acid might partition with TCE, and the adsorption or deposition of humic acid onto Fe0surface would further facilitated TCE immobilization. Once the reduction reactive sites on Fe0surfaces were covered by accumulated humic acid and the partition of TCE to humic acid became saturated, TCE removal in Fe0was observed retarded.

scholarly journals Molecular characterization of an end-residue of humeomics applied to a soil humic acid

RSC Advances ◽  
2014 ◽  
Vol 4 (45) ◽  
pp. 23658-23665 ◽  
Author(s):  
A. Nebbioso ◽  
A. Piccolo ◽  
M. Lamshöft ◽  
M. Spiteller
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Molecular Characterization ◽  
Natural Organic Matter ◽  
Molecular Composition ◽  
Chemical Fractionation ◽  
Soil Humic Acid

Humeomics encompasses step-wise chemical fractionation and instrumental determination to fully characterize the heterogeneous molecular composition of natural organic matter.

Identification of humic acid-like and fulvic acid-like natural organic matter in river water using fluorescence spectroscopy

2011 ◽  
Vol 63 (10) ◽  
pp. 2427-2433 ◽  
Author(s):  
R. H. Peiris ◽  
H. Budman ◽  
C. Moresoli ◽  
R. L. Legge
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Water Sample ◽  
Fulvic Acid ◽  
River Water ◽  
Natural Organic Matter ◽  
Drinking Water Treatment ◽  
Fluorescence Analysis ◽  
Product Formation ◽  
Fluorescence Excitation

Identifying the extent of humic acid (HA)-like and fulvic acid (FA)-like natural organic matter (NOM) present in natural water is important to assess disinfection by-product formation and fouling potential during drinking water treatment applications. However, the unique fluorescence properties related to HA-like NOM is masked by the fluorescence signals of the more abundant FA-like NOM. For this reason, it is not possible to accurately characterize HA-like and FA-like NOM components in a single water sample using direct fluorescence EEM analysis. A relatively simple approach is described here that demonstrates the feasibility of using a fluorescence excitation-emission matrix (EEM) approach for identifying HA-like and FA-like NOM fractions in water when used in combination with a series of pH adjustments and filtration steps. It is demonstrated that the fluorescence EEMs of HA-like and FA-like NOM fractions from the river water sample possessed different spectral properties. Fractionation of HA-like and FA-like NOM prior to fluorescence analysis is therefore proposed as a more reasonable approach.

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