Effect of dissolved organic carbon and salinity on flocculation process of heavy metals during mixing of the Navrud River water with Caspian Seawater

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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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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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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Behavior of Enzyme Activities Exposed to Contamination by Heavy Metals and Dissolved Organic Carbon in Calcareous Agricultural Soils

Soil and Sediment Contamination An International Journal ◽

10.1080/15320383.2017.1289499 ◽

2017 ◽

Vol 26 (3) ◽

pp. 259-276 ◽

Cited By ~ 3

Author(s):

Aziza Kouchou ◽

Naoual Rais ◽

Jeanne-Chantal Thoisy ◽

Joëlle Duplay ◽

Malika Ghazi ◽

...

Keyword(s):

Heavy Metals ◽

Organic Carbon ◽

Dissolved Organic Carbon ◽

Enzyme Activities ◽

Agricultural Soils

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Effect of Pb2+, Cd2+, Cu2+ and dissolved organic carbon (DOC) on the distribution and partition of decabromodiphenyl ether (BDE-209) in a water–sediment system

RSC Advances ◽

10.1039/c5ra17443k ◽

2015 ◽

Vol 5 (127) ◽

pp. 105259-105265

Author(s):

Donggao Yin ◽

Hui Peng ◽

Hua Yin ◽

Su Zhou ◽

Shichang Xiong ◽

...

Keyword(s):

Heavy Metals ◽

Organic Carbon ◽

Dissolved Organic Carbon ◽

Polybrominated Diphenyl Ethers ◽

Electronic Waste ◽

Combined Pollution ◽

Decabromodiphenyl Ether ◽

System P ◽

Diphenyl Ethers ◽

Bde 209

The combined pollution of polybrominated diphenyl ethers (PBDEs) and heavy metals in electronic waste dismantling areas has received increasing concern in recent years.

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Export of Dissolved Organic Carbon from a Ponded Freshwater Marsh Receiving Diverted Mississippi River Water

The Scientific World JOURNAL ◽

10.1100/tsw.2008.156 ◽

2008 ◽

Vol 8 ◽

pp. 1210-1218 ◽

Cited By ~ 3

Author(s):

R. D. DeLaune ◽

C. B. Johnson ◽

R. P. Gambrell ◽

A. Jugsujinda

Keyword(s):

Organic Carbon ◽

Dissolved Organic Carbon ◽

River Water ◽

Mississippi River ◽

Wetland Loss ◽

Freshwater Marsh ◽

River Diversion ◽

Marsh Soil ◽

Northern Portion ◽

Mississippi River Water

A series of diversion projects has been implemented to reintroduce Mississippi River water into Louisiana's coastal wetlands in order to reduce wetland loss. The export of dissolved organic carbon (DOC) was measured in a 3,700-ha ponded freshwater marsh that receives diverted Mississippi River water. Results show that highly organic marsh soil and plant material are a source of DOC. DOC, on average, was 3 mg/l greater in outlet water as compared to the concentration in river water entering the wetland. DOC in water leaving the marsh was higher in summer months, with a concentration up to 18 mg/l. Based on a discharge of 1,000 ft3/sec (28.3 m3/sec), it was estimated that the equivalent of 7,335 kg/day of DOC would be exported from the marsh into Lake Cataouatche, located in the northern portion of the Louisiana Barataria Basin estuary. Results suggest that river diversion would likely increase the export of DOC from the marsh as compared to normal transport associated with rainfall and tidal exchange.

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Estimation of Biochemical Oxygen Demand Based on Dissolved Organic Carbon, UV Absorption, and Fluorescence Measurements

Journal of Chemistry ◽

10.1155/2013/243769 ◽

2013 ◽

Vol 2013 ◽

pp. 1-9 ◽

Cited By ~ 12

Author(s):

Jihyun Kwak ◽

Bumju Khang ◽

Eunhee Kim ◽

Hyunook Kim

Keyword(s):

Wastewater Treatment ◽

Organic Carbon ◽

Dissolved Organic Carbon ◽

River Water ◽

Biochemical Oxygen Demand ◽

Treatment Plant ◽

Oxygen Demand ◽

Fluorescence Measurements ◽

Wwtp Effluent ◽

Software Sensors

Determination of 5-d biochemical oxygen demand (BOD5) is the most commonly practiced test to assess the water quality of surface waters and the waste loading. However, BOD5is not a good parameter for the control of water or wastewater treatment processes because of its long test period. It is very difficult to produce consistent and reliable BOD5results without using careful laboratory quality control practices. This study was performed to develop software sensors to predict the BOD5of river water and wastewater. The software sensors were based on the multiple regression analysis using the dissolved organic carbon (DOC) concentration, UV light absorbance at 254 nm, and synchronous fluorescence spectra. River water samples and wastewater treatment plant (WWTP) effluents were collected at 1-hour interval to evaluate the feasibility of the software sensors. In short, the software sensors developed in this study could well predict the BOD5of river water (r=0.78) and for the WWTP effluent (r=0.90).

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