Journal ArticleDOI
Natural organic matter removal by coagulation during drinking water treatment: A review
TLDR
Most of the NOM can be removed by coagulation, although, the hydrophobic fraction and high molar mass compounds of NOM are removed more efficiently than hydrophilic fraction and the low molarmass compounds.About:
This article is published in Advances in Colloid and Interface Science.The article was published on 2010-09-15. It has received 1106 citations till now. The article focuses on the topics: Water treatment & Coagulation (water treatment).read more
Citations
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Desalination and Water Treatment
Abstract: ABSTRACT This work concerns the plotting current intensity I (A) vs. applied voltage E (V) curves ofelectrocoagulation (EC) of some organic (humic acid (HA) and phenol) and inorganic (cop-per sulphate and cadmium chloride) compounds which are often found in water/wastewa-ters. The study is conducted in batch mode using Fe electrodes at laboratory scale. Thedevice is constituted with two ordinary steel electrodes with active area S = 19.95 cm 2 and4 cm as separation from each other in a 500 mL beaker which is filled with 500 mL solutionto treat. The applied voltage is 12 V for 45 min as EC time and an optimal pH which isdetermined from current intensity I (A) as a function of applied voltage E (V) curves.Depending on the pollutant type, different EC process mechanisms are proposed and lessor more important reduction levels are achieved in these experiments.Keywords: Electrocoagulation (EC); Humic acid (HA); Phenol; Copper; Cadmium; Iron 1. IntroductionIn Algeria, the water resources are limited andunevenly distributed. These resources have been, overthe last two decades, found to have negative effectslike drought and pollution. The absolutely pure waterrarely exists in nature. The raw waters still containmany organic and inorganic pollutants from naturalor human activity [1]. One of the goals sought inwater treatment is to reduce or even eliminate thesepollutants [2–4]. This is performed by physicochemicalprocesses (coagulation/flocculation, sedimentation,filtration and disinfection) [5–11]. Currently, there is atendency to use electrochemical techniques (electroco-agulation (EC), electroflotation, electrooxidation,electrodisinfection, etc.) [12–18] as promising methodsfor water/wastewater treatment [19–23].This work aims to contribute in the comprehensionof EC process by studying the reduction of some rep-resentative pollutants, such as organic (humic acid(HA) and phenol) and inorganic (copper and cad-mium) compounds contained in wastewater. Syntheticsolutions of these substances are prepared and electro-coagulated at a laboratory scale.The tests consisted in carrying out electrolysisexperiments in an EC reactor. In order to distinguishbetween the different mechanisms of EC process, firstof all, the pH of distilled water is adjusted at threerepresentative values of the pH range: pH 2 (acidic), 7(neutral) and 12 (alkaline). Then, the solutions areelectrolysed as control tests during which the evolu-tion of the current intensity I (A) as a function of the
Journal ArticleDOI
Improved Dissolved Air Flotation Performances Using Chitosan under Different Dosing Schemes
Shi Yulong,Jun Ma,Jiaxuan Yang +2 more
TL;DR: In this article, the authors investigated the applications of chitosan as a bubble surface modifier in the coagulation dissolved air flotation (DAF) process for river water treatment.
Journal ArticleDOI
Removal of organic matter of electrodialysis reversal brine from a petroleum refinery wastewater reclamation plant by UV and UV/H202 process
Priscila Barbosa Moser,Bárbara C. Ricci,Clara B. Alvim,Ana C. F. Cerqueira,Míriam Cristina Santos Amaral +4 more
TL;DR: Results showed a significant reduction in UVA254, whereas no reduction was observed for chemical oxygen demand (COD), in the UV process, suggesting great cleavage but limited mineralization of the organic matter.
Dissertation
The Impact of Coagulation on Endocrine Disrupting Compounds, Pharmaceutically Active Compounds and Natural Organic Matter
TL;DR: In this paper, the authors investigated the link between various NOM types with EDC/PhAC removal and found that certain NOM fractions are significantly removed during coagulation while others increase in concentration.
Journal ArticleDOI
Pilot scale investigation of coagulation combined with ozonation and pH adjustment in treatment of NOM rich water
TL;DR: In this paper, the results of a pilot scale investigation of coagulation using aluminium based coagulants (polyaluminium chloride sulphate (PACL1) and polyaluminum chloride (PACl2)), combined with pre-ozonation and pH adjustment, on natural organic matter (NOM) removal from groundwater were conducted at a semi-industrial pilot plant.
References
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Book
Organic geochemistry of natural waters
TL;DR: The first part of the book as mentioned in this paper is a general overview of the amount and general nature of dissolved organic carbon in natural waters, and the second part is a summary of the data that has accumulated from many disciplines over the last decade.
Journal ArticleDOI
Occurrence of a New Generation of Disinfection Byproducts
Stuart W. Krasner,Howard S. Weinberg,Susan D. Richardson,Salvador J. Pastor,Russell Chinn,Michael J. Sclimenti,Gretchen D. Onstad,Alfred D. Thruston +7 more
TL;DR: A survey of disinfection byproduct (DBP) occurrence in the United States was conducted at 12 drinking water treatment plants to obtain quantitative occurrence information for new DBPs (beyond those currently regulated and/or studied) for prioritizing future health effects studies.
Journal ArticleDOI
Coagulation by hydrolysing metal salts
Jinming Duan,John Gregory +1 more
TL;DR: In this paper, a detailed understanding of the sweep flocculation mechanism is provided, especially with regard to the role of charge neutralization and hydroxide precipitation. But the results can be reasonably well explained in terms of established ideas, and there are also some uncertainties regarding the action of pre-hydrolysed coagulants.
Journal ArticleDOI
Organic polyelectrolytes in water treatment.
Brian Bolto,John Gregory +1 more
TL;DR: There is a focus on polymers for primary coagulation, their use as coagulant aids, in the recycling of filter backwash waters, and in sludge thickening.
Journal ArticleDOI
Fundamentals, present and future perspectives of electrocoagulation.
TL;DR: This paper presents an in-depth discussion and consideration of the factors that need to be addressed for optimum performance of this technology.