Microbial uptake kinetics of dissolved organic carbon (DOC) compound groups from river water and sediments

The objectives of this study were to investigate impact of preoxidation on disinfection by-product (DBP) precursors in drinking water via two different preoxidation methods. The full-scale study was conducted on surface river water in a water supply plant in Tianjin, China. Two treatment trains were performed, with prechlorination and preozonation as preoxidation methods, respectively. The water samples were collected on different stages along the treatment processes and analyzed by following organic parameters: dissolved organic carbon (DOC), UV254 and specific ultraviolet absorbance (SUVA). The results indicated that Train 2 with preozonation was more effective to reduce DBP precursors. Preozonation possessed an excellent ability in the removal of UV254 and SUVA, the removal efficiencies were 25.14% and 18.77%, respectively, comparing to the removal rates of 6.66% and 5.64% during prechlorination, separately.

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Fluxes and retention of nutrients and organic carbon in Manko estuary, Okinawa, Japan: influence of river discharge variations

Advances in Oceanography and Limnology ◽

10.4081/aiol.2014.5354 ◽

2014 ◽

Vol 5 (2) ◽

pp. 141 ◽

Cited By ~ 1

Author(s):

D. Shilla

Keyword(s):

Organic Carbon ◽

Dissolved Organic Carbon ◽

River Water ◽

Rainy Season ◽

River Discharge ◽

Geochemical Processes ◽

Dissolved Nutrients ◽

Transport And Transformation ◽

Organic Nutrients ◽

Annual Transport

Estuaries are often considered important filters for inorganic and organic nutrients, as they are located between the land and sea. This study reports on the fluvial fluxes and estuarine transformations and retention of dissolved nutrients (total oxidized nitrogen [TON = NO2− and NO3−]), NH4+, PO43−, and dissolved organic carbon (DOC) in Manko estuary, Okinawa, Japan. The transport and transformation of dissolved nutrients and DOC varied widely among the eight conducted surveys due to variations in freshwater discharge and subsequent flushing times. Under high fluvial discharge, particularly during the May–June rainy season, the transport of nutrients and DOC accounted for up to 70%, 88%, 93%, and 53% of the annual transport of TON, NH4+, PO43−, and DOC, respectively. The flushing times of river water into the estuary, which varied from 0.5 to 46 days, were important in determining the degree to which fluvial nutrients were transformed and retained within the estuary. The effect of long flushing times was evident during the dry months (December–March), when biological and geochemical processes within the estuary removed most of the fluvial nutrients and DOC.

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Kinetics of divalent mercury reduction by zero-valent iron: the effects of pH, chloride, and dissolved organic carbon

10.5004/dwt.2017.20550 ◽

2017 ◽

Vol 71 ◽

pp. 182-190 ◽

Cited By ~ 1

Author(s):

Go-Un Nam ◽

Seunghee Han ◽

Yongseok Hong

Keyword(s):

Organic Carbon ◽

Dissolved Organic Carbon ◽

Zero Valent Iron ◽

Effects Of Ph ◽

Mercury Reduction ◽

Kinetics Of

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Carbon cycling in mesohaline Chesapeake Bay sediments 2: Kinetics of particulate and dissolved organic carbon turnover

Journal of Marine Research ◽

10.1357/0022240963213349 ◽

1996 ◽

Vol 54 (2) ◽

pp. 343-383 ◽

Cited By ~ 12

Author(s):

Eric E. Roden ◽

Jon H. Tuttle

Keyword(s):

Organic Carbon ◽

Dissolved Organic Carbon ◽

Chesapeake Bay ◽

Carbon Cycling ◽

Carbon Turnover ◽

Kinetics Of

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Impact of hurricanes on the flux of rainwater and Cape Fear River water dissolved organic carbon to Long Bay, southeastern United States

Global Biogeochemical Cycles ◽

10.1029/2004gb002229 ◽

2004 ◽

Vol 18 (3) ◽

pp. n/a-n/a ◽

Cited By ~ 35

Author(s):

G. Brooks Avery ◽

Robert J. Kieber ◽

Joan D. Willey ◽

G. Christopher Shank ◽

Robert F. Whitehead

Keyword(s):

United States ◽

Organic Carbon ◽

Dissolved Organic Carbon ◽

River Water ◽

Southeastern United States ◽

Long Bay ◽

Cape Fear River ◽

Cape Fear

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Study of new adsorption isotherm model and kinetics of dissolved organic carbon in synthetic wastewater by granular activated carbon

Journal of the Korea Academia-Industrial cooperation Society ◽

10.5762/kais.2014.15.4.2029 ◽

2014 ◽

Vol 15 (4) ◽

pp. 2029-2035

Author(s):

Seoung-Hyun Kim ◽

Sunghoon Shin ◽

Jinhyuk Kim ◽

Dalsik Woo ◽

Hosun Lee

Keyword(s):

Activated Carbon ◽

Adsorption Isotherm ◽

Organic Carbon ◽

Dissolved Organic Carbon ◽

Granular Activated Carbon ◽

Synthetic Wastewater ◽

Isotherm Model ◽

Kinetics Of

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Hydrological controls on DOC : nitrate resource stoichiometry in a lowland, agricultural catchment, southern UK

10.5194/hess-2017-30 ◽

2017 ◽

Cited By ~ 2

Author(s):

Catherine M. Heppell ◽

Andrew Binley ◽

Mark Trimmer ◽

Tegan Darch ◽

Ashley Jones ◽

...

Keyword(s):

Climate Change ◽

Organic Carbon ◽

Dissolved Organic Carbon ◽

River Water ◽

Positive Relationship ◽

Agricultural Landscapes ◽

Lowland River ◽

Significant Positive Relationship ◽

Molar Ratios ◽

The Relationship

Abstract. The role that hydrology plays in governing the interactions between dissolved organic carbon (DOC) and nitrogen in rivers draining lowland, agricultural landscapes is currently poorly understood, yet important to assess given the potential changes to production and delivery of DOC and nitrate arising from climate change. We measured DOC and nitrate concentrations in river water of six reaches of the lowland River Hampshire Avon (Wiltshire, southern UK) in order to quantify the relationship between Baseflow Index (BFI) and DOC : nitrate molar ratios across contrasting geologies (Chalk, Greensand and clay). We found a significant positive relationship between nitrate and Baseflow Index (p

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Seasonal variations in concentration and lability of dissolved organic carbon in Tokyo Bay

Biogeosciences ◽

10.5194/bg-12-269-2015 ◽

2015 ◽

Vol 12 (1) ◽

pp. 269-279 ◽

Cited By ~ 17

Author(s):

A. Kubo ◽

M. Yamamoto-Kawai ◽

J. Kanda

Keyword(s):

Organic Carbon ◽

Dissolved Organic Carbon ◽

River Water ◽

Seasonal Variations ◽

Relative Concentration ◽

Sewage Treatment ◽

Sewage Treatment Plant ◽

Treatment Plant ◽

Tokyo Bay ◽

Chl A

Abstract. Concentrations of recalcitrant and bioavailable dissolved organic carbon (DOC) and their seasonal variations were investigated at three stations in Tokyo Bay, Japan, and in two freshwater sources flowing into the bay. On average, recalcitrant DOC (RDOC), as a remnant of DOC after 150 days of bottle incubation, accounted for 78% of the total DOC in Shibaura sewage treatment plant (STP) effluent, 67% in the upper Arakawa River water, 66% in the lower Arakawa River water, and 78% in surface bay water. Bioavailable DOC (BDOC) concentrations, defined as DOC minus RDOC, were lower than RDOC at all stations. In freshwater environments, RDOC concentrations were almost constant throughout the year. In the bay, RDOC was higher during spring and summer than in autumn and winter because of freshwater input and biological production. The relative concentration of RDOC in the bay derived from phytoplankton, terrestrial, and open-oceanic waters was estimated to be 8–10, 21–32, and 59–69%, respectively, based on multiple regression analysis of RDOC, salinity, and chl a. In addition, comparison with previous data from 1972 revealed that concentrations of RDOC and BDOC have decreased by 33 and 74% at freshwater sites and 39 and 76% in Tokyo Bay, while the ratio of RDOC to DOC has increased. The change in DOC concentration and composition was probably due to increased amounts of STP effluent entering the system. Tokyo Bay exported mostly RDOC to the open ocean because of the remineralization of BDOC.

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