• Title, Summary, Keyword: Fractionation of DOM

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CHARACTERIZATION OF RECALCITRANT DISSOLVED ORGANIC MATTER IN LAKE AND INFLOW RIVER WATERS

  • Kim, Yong-Hwan;Lee, Shun-Hwa;Kim, Jung-Ho;Park, Jong-Woong;Choi, Kwang-Soon
    • Environmental Engineering Research
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    • v.11 no.4
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    • pp.181-193
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    • 2006
  • The hydrophilic or hydrophobic characteristics of dissolved organic matter (DOM) from different origins in lake and river waters were investigated using spectrometric and chromatographic analyses of water samples. DOM in a deep, mesotrophic lake (Lake Unmun) was fractionated using three types of ion exchange resins and classified into aquatic humic substances (AHS), hydrophobic neutrals (HoN), hydrophilic acids (HiA), hydrophilic neutrals (HiN), and bases (BaS). The DOM fractionation provided insight into the understanding of the nature of heterogeneous DOM molecules present in different water sources. The UV/DOC ratios were determined for samples from the influent river and lake waters during DOM fractionation and incubation. AHS prevailed over DOM in the lake and river waters. After biodegradation, the relative contribution of AHS in the total DOM became more significant. It indicates that the AHS fraction would increase while water stay long time in the lake.

Study on the Characteristics of Dissolved Organic Matters from Diverse Sources by XAD Resin Fractiontion and Microbial Incubation Experiments (XAD 수지분획과 생분해 실험에 의한 기원별 용존유기물질 특성 연구)

  • Oh, Seijin;Choi, ChanKyu;Hur, Jin;Jung, Myung-Sook;Shin, Hyun-Sang
    • Journal of Korean Society on Water Environment
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    • v.26 no.6
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    • pp.976-985
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    • 2010
  • In this study, characteristics of dissolved organic matter (DOM) from Lake Paldang and seven other DOM sources (lake plankton, plants, soil, composite, treated sewage) were studied using XAD resin fractionation and 28-day microbial incubation experiment. Distribution patterns of DOM-fractions, which include hydrophilic acids (HiA), hydrophilic bases (HiB), hydrophilic neutrals (HiN), hydrophobic acids (HoA), hydrophobic neutrals (HoN) and the extent of DOM biodegradation (i.e., biodegradability) were different depending on the origins of the DOM samples. The DOM distribution pattern and the biodegradability were found to be effective for distinguishing the different DOM sources. The biodegradability (%) had negative correlations with the content (%) of hydrophobic fractions (Ho) and specific UV absorbance of DOM, which indicate that the Ho fractions contain more aromatic carbon structures and relatively stable during biodegradation, irrespective of the sources. To gain additional insight into the microbial transformation of the DOM, we also investigated the changes in the fraction's distribution for plankton, leaf litter and composite samples after the incubation. The results showed that biodegradation of hydrophilic fraction (Hi) causes an increase in the proportion of Ho (HoA, HoN), while biodegradation of HoA increases the HoN production.

RESEARCH PAPERS : CHARACTERIZATION OF DISSOLVED ORGANIC MATTER IN A SHALLOW EUTROPHIC LAKE AND INFLOWING WATERS

  • Kim, Yong-Hwan;Lee, Seon-Hwa;Akio, Imai;Kazuo, Matsushige
    • Environmental Engineering Research
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    • v.7 no.2
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    • pp.93-101
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    • 2002
  • The seasonal patterns of dissolved organic matter (DOM) in Lake Kasumigaura, a shallow, eutrophic lake, and serveral DOM sources in its catchment area were investigated. DOM was fractionated using three resin adsorbents into classes: aquatic humic substances (AHS=humic acid+fulvic acid), hydrophobic neutrals (HoN), hydrophilic acids (HiA), bases (BaS) and hydrophilic neutrals (HiN). The DOM produced significantly different fraction distributions depending on the origin of sample. AHS and HiA prevailed over AHS in the lake while AHS and HiA existed at almost the same concentration levels in the rivers. AHS seems to be a more dominant component in rever water than lake water. The dominance of organic acids was also observed in the DOM sources: forest stream (FS), plowed field percolate (PFP), domestic sewage (DS) and sewage treatment plant effluent (STPE).

Evaluation of Haloacetic Acid Formation Potential in Drinking Water Treatment Process by Fraction Technique (정수처리 공정에서 용존 유기물질 분류에 의한 haloacetic acid 생성능 평가)

  • Son, Hee-Jong;Hwang, Young-Do;Ryu, Dong-Choon;Jung, Chul-Woo;Lee, Gun;Son, Hyeng-Sik
    • Journal of Environmental Science International
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    • v.23 no.9
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    • pp.1655-1662
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    • 2014
  • A comprehensive fractionation technique was applied to a set of water samples obtained along drinking water treatment process with ozonation and biological activated carbon (BAC) process to obtain detailed profiles of dissolved organic matter (DOM) and to evaluate the haloacetic acid (HAA) formation potentials of these DOM fractions. The results indicated that coagulation-sedimentation-sand filtration treatment showed limited ability to remove hydrophilic fraction (28%), while removal of hydrophobic and transphilic fraction were 57% and 40%, respectively. And ozonation and BAC treatment showed limited ability to remove hydrophobic fractions (6%), while removal of hydrophilic and transphilic fractions were 25% and 18%. The haloacetic acid formation potential (HAAFP)/dissolved organic carbon (DOC) of hydrophilic fraction was the highest along the treatment train and HAAFP/DOC of hydrophilic fraction was higher than hydrophobic and transphilic fraction as 23%~30%, because of better removal for hydrophobic fraction both in concentration and reactivity.

Effect of Ozonation on Removal of Dissolved Organic Matter by Granular Activated Carbon Process (오존공정이 입상활성탄공정에서 용존유기물질의 제거에 미치는 영향)

  • Ahn, Hyo-Won;Chae, Seon-Ha;Wang, Chang-Keun;Lim, Jae-Lim
    • Journal of Korean Society of Environmental Engineers
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    • v.30 no.6
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    • pp.601-608
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    • 2008
  • The objective of this study was to evaluate the effect of ozonation as pretreatment on the removal of dissolved or biodegradable organic matter(DOM or BOM), the variance of DOM fractionation, and microbial regrowth by pilot-scale granular activated carbon processes in which adsorption and biodegradability was proceeding due to long time operation. Regardless of point of ozonation applied, GAC processes with ozonation(i.e., Ozonation combined with GAC Filter-adsorber; Pre O$_3$ + F/A, Ozonation combined with GAC adsorber; Post O$_3$ + GAC) compared with GAC processes without ozonation(i.e., GAC Filter-adsorber; F/A, GAC adsorber; GAC) removed approximately 10 to 20% more of DOC, hydrophilic DOM(HPI), BDOC and AOC after long period of operation that biological activity was assumed to happen. Ozonation was not found to have a significant effect on the removal of DOC, but caused the decrease of AOC by approximately 20%. It was found that the fixed bacterial biomass on GAC media did not show a significant difference between the GAC with ozonation and GAC without ozonation as pre-treatment, whereas the HPC of column effluent was more biostable at Post O$_3$ + GAC compared with F/A or GAC.