In-situ determination of current density distribution and fluid modeling of an electrocoagulation process and its effects on natural organic matter removal for drinking water treatment

2020 ◽  
Vol 171 ◽  
pp. 115404 ◽  
Author(s):  
Sean T. McBeath ◽  
Amin Nouri-Khorasani ◽  
Madjid Mohseni ◽  
David P. Wilkinson
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Current Density ◽  
Drinking Water Treatment ◽  
Current Density Distribution ◽  
Electrocoagulation Process

scholarly journals Natural organic matter removal by ion exchange at different positions in the drinking water treatment lane

2013 ◽  
Vol 6 (1) ◽  
pp. 1-10 ◽  
Author(s):  
A. Grefte ◽  
M. Dignum ◽  
E. R. Cornelissen ◽  
L. C. Rietveld
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Organic Matter ◽  
Water Treatment ◽  
Organic Carbon ◽  
Natural Organic Matter ◽  
Drinking Water Treatment ◽  
Biological Stability ◽  
Sand Filtration ◽  
Slow Sand Filtration

Abstract. To guarantee a good water quality at the customers tap, natural organic matter (NOM) should be (partly) removed during drinking water treatment. The objective of this research was to improve the biological stability of the produced water by incorporating anion exchange (IEX) for NOM removal. Different placement positions of IEX in the treatment lane (IEX positioned before coagulation, before ozonation or after slow sand filtration) and two IEX configurations (MIEX® and fluidized IEX (FIX)) were compared on water quality as well as costs. For this purpose the pre-treatment plant at Loenderveen and production plant Weesperkarspel of Waternet were used as a case study. Both, MIEX® and FIX were able to remove NOM (mainly the HS fraction) to a high extent. NOM removal can be done efficiently before ozonation and after slow sand filtration. The biological stability, in terms of assimilable organic carbon, biofilm formation rate and dissolved organic carbon, was improved by incorporating IEX for NOM removal. The operational costs were assumed to be directly dependent of the NOM removal rate and determined the difference between the IEX positions. The total costs for IEX for the three positions were approximately equal (0.0631 € m−3), however the savings on following treatment processes caused a cost reduction for the IEX positions before coagulation and before ozonation compared to IEX positioned after slow sand filtration. IEX positioned before ozonation was most cost effective and improved the biological stability of the treated water.

scholarly journals Fouling analysis of polysulfone ultrafiltration membranes used for drinking water treatment

2011 ◽  
Vol 11 (6) ◽  
pp. 668-674 ◽  
Author(s):  
B. Q. Zhao ◽  
C. P. Huang ◽  
S. Y. Chen ◽  
D. S. Wang ◽  
T. Li ◽  
...  
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Water Treatment ◽  
Fulvic Acid ◽  
Humic Substances ◽  
Natural Organic Matter ◽  
Drinking Water Treatment ◽  
Ultrafiltration Membranes ◽  
Fluorescence Excitation ◽  
Hydrophobic Fraction

Natural organic matter (NOM) plays a significant role in the fouling of ultrafiltration membranes in drinking water treatment processes. For a better understanding of the interaction between fractional components of NOM and polysulfone (PS) ultrafiltration membranes used for drinking water treatment, fouling and especially the physically irreversible fouling of natural organic matter were investigated. Resin fractionation, fluorescence excitation–emission matrix (EEM) spectroscopy, fourier transform infrared spectroscopy (FTIR), contact angle and a scanning electron microscope (SEM) were employed to identify the potential foulants. The results showed that humic acid and fulvic acid of small size were likely to permeate the membrane, while the hydrophobic fraction of humic and fulvic acid and aromatic proteins tended to be rejected and retained. Organic compounds such as proteins, humic substances, and polysaccharide-like materials, were all detected in the fouling layer. The physically irreversible fouling of the PS membrane seemed to be mainly attributed to the hydrophobic fraction of humic substances.

Evaluation of drinking water treatment processes focusing on natural organic matter removal and on disinfection by-product formation

2002 ◽  
Vol 2 (5-6) ◽  
pp. 459-464 ◽  
Author(s):  
S. Chae
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
High Performance ◽  
Drinking Water Treatment ◽  
Molecular Size ◽  
Product Formation ◽  
Size Exclusion ◽  
Activated Carbon Adsorption

The aim of this study was to characterize and compare natural organic matter (NOM) removal and disinfection by-product (DBP) formation in the drinking water treatment train that can give valuable information, while optimizing the treatment process. In this study, the determination of the hydrophobic (HPO), transphilic (THP) and hydrophilic (HPI) NOM distribution was used in parallel with more related drinking water parameters to compare the selected waters. High-performance size-exclusion chromatography (HPSEC) was applied to evaluate the relative changes of molecular size distribution of NOM in different treatment steps and source waters. This showed that the quantity, speciation and activated carbon adsorption of DBPs could vary not only by water quality, but also by the distribution and properties of the organic molecules that comprise NOM.

Drinking water treatment - understanding the processes and meeting the challenges

2001 ◽  
Vol 1 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Don Bursill
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Drinking Water Treatment ◽  
Predictive Capacity ◽  
Treatment Processes ◽  
Key Factor ◽  
Work Done ◽  
Water Catchments

On and follow Natural organic matter (NOM) derived from soil and vegetation in water catchments is the key factor influencing most, if not all water treatment processes. The structure of the NOM and its involvement in water treatment processes requires better understanding. It seems likely that a better understanding of NOM reactions could lead to far better predictive capacity for water treatment designers and operators. Certainly the removal of NOM as a first step to the production of drinking water has many attractions. This paper provides an overview of work done by the author and many of his colleagues to advance this issue.

Oxidation efficiencies of natural organic matter by the different ozone contact systems

2008 ◽  
Vol 8 (6) ◽  
pp. 673-680
Author(s):  
Byoung-Ho Lee ◽  
Won-Chul Song ◽  
Hyun-Joo Yang ◽  
Jeong-Hyun Kim ◽  
Young-Suk Kim
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Drinking Water Treatment ◽  
Oxidation Potential ◽  
Contact Method ◽  
Removal Rates ◽  
Efficient System ◽  
Ozone Concentrations

Owing to the strong oxidation potential, ozone has been used widely in advanced water treatment. However, degradation and oxidation efficiencies of NOM (Natural Organic Matter) by the traditional ozone contact system are normally believed to be low. Oxidation efficiency of NOM by the PHOC (Pressurized High Ozone Contact) method was compared with that by the MOC (Mechanical Ozone Contact, the traditional system) method for the drinking water treatment. Sand filtered water of the drinking water treatment plant was used for experimental samples. Removal rates of UV254 absorbance, KMnO4 consumption and DOC by the MOC system were 18.4%, 2.39%, and 2.72% respectively with 1 mg-O3/L. On the other hand, removal rates of KMnO4 consumption, TOC, DOC, UV254 absorbance and SUVA by the PHOC system were 8–20%, 7.52–34.4%, 6.65–18.2%, 37.4–60.8% and 33.8–60% with 1–3 mg/L of ozone concentrations. Concentration of BDOC after ozone application was 0.003–0.044 mg/L by the MOC method, while 0.084–0.044 mg/L by the PHOC method with 1–3 mg/L of ozone concentrations. Concerning molecular weight distribution, fractions of NOM below 1 kDa were increased by the PHOC method of ozone application. Analysis shows that the reason for overall enhancement of the treatment efficiencies by the PHOC system is because contacting surface area of numerous micro ozone bubbles was increased dramatically in the PHOC system, and oxidation potential was enhanced by increased ozone concentrations in the ozone contact tank. Thus, it is understood that the PHOC method is a more efficient system for ozone application than the traditional MOC system in drinking water treatment process.

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