Monitoring of the impact of the proliferations of cyanobacteria on the characteristics of Natural Organic Matter in a eutrophic water resource: Comparison between 2012–2013 and 2017–2018

Chemosphere ◽  
2021 ◽  
pp. 132834
Author(s):  
Hélène Thuret-Benoist ◽  
Virginie Pallier ◽  
Geneviève Feuillade-Cathalifaud
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Water Resource ◽  
Eutrophic Water ◽  
The Impact

Comparison of disinfection byproduct (DBP) formation from different UV technologies at bench scale

2002 ◽  
Vol 2 (5-6) ◽  
pp. 515-521 ◽  
Author(s):  
W. Liu ◽  
S.A. Andrews ◽  
J.R. Bolton ◽  
K.G. Linden ◽  
C. Sharpless ◽  
...  
Keyword(s):  
Organic Matter ◽  
Carboxylic Acids ◽  
Natural Organic Matter ◽  
Uv Irradiation ◽  
Direct Action ◽  
Disinfection Byproduct ◽  
Pressure Medium ◽  
The Impact ◽  
As Effects

The impact of UV irradiation on disinfection byproduct (DBP) formation was investigated for low pressure, medium pressure and pulsed UV technologies using a broad range of UV doses. Four classes of DBPs (THMs, HAAs, aldehydes and carboxylic acids) were examined. This enabled the determination of effects resulting from the direct action of UV irradiation on natural organic matter (aldehydes, carboxylic acids) as well as effects on the ultimate formation of chlorinated DBPs (THMs and HAAs) from secondary chlorination. For doses of less than 1,000 mJ/cm2, UV irradiation did not affect THM and HAA formation in subsequent chlorination processes, however higher UV doses resulted in lower ultimate concentrations of THMs and HAAs. UV irradiation also resulted in the formation of aldehydes and carboxylic acids at UV doses above 500 mJ/cm2, compounds that are known to adversely effect drinking water biostability.

Direct coagulation pretreatment in nanofiltration of waters rich in organic matter and calcium

2001 ◽  
Vol 1 (4) ◽  
pp. 25-33
Author(s):  
A. I. Schäfer ◽  
A.G. Fane ◽  
T.D. Waite
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Surface Waters ◽  
Process Efficiency ◽  
Nanofiltration Membranes ◽  
Multivalent Ions ◽  
Flux Decline ◽  
Calcium Complexes ◽  
The Impact ◽  
Significant Flux

Nanofiltration (NF) can remove natural organic matter (NOM) and multivalent ions from surface waters. Large hydrophobic organics and calcium ions are responsible for irreversible fouling of nanofiltration membranes and thus a decrease of process efficiency and increase in cleaning requirements. Fouling due to the precipitation of organic-calcium complexes and the impact of colloids and coagulant (FeCl3) on the precipitation of these species was investigated. Coagulation in solution (as opposed to in the boundary layer) did not cause significant flux decline and was able to prevent irreversible fouling under conditions which were previously determined as detrimental. The rejection was varied if a strongly charged solid was deposited on the membrane.

Spatio-temporal variability of natural organic matter in Lancang River: concentration, sources and destination

2020 ◽  
Author(s):  
Ting Wang
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Natural Organic Matter ◽  
Temporal Variability ◽  
Anthropogenic Activities ◽  
Sharp Decrease ◽  
C3 Plants ◽  
Lancang River ◽  
Spatio Temporal ◽  
The Impact

<p>Natural organic matter (NOM) played an important role in the riverine and global carbon cycle. In order to evaluate the impact of river discharge and anthropogenic activities on the spatio-temporal variability of NOM content and sources in Lancang River, China, a comprehensive study was conducted in two years from the head to the leave-boundary section. As results, the DOC value ranged among 0.91-2.80 mg/L, with sharp decrease in the middle reaches and downstream. While the SOC value significantly enhanced along the water flow, varied from 0.06% to 3.54%. The isotopic composition of organic carbon (δ13C) suggested that predominant contribution of NOM is C3 plants in the upper reach, algae and soil organic matter in the middle reach, and aquatic plants in the downstream. EEM-PARAFAC results proved that NOM in Lancang River is mainly terrestrial organic carbon, while in situ microbial transformed NOM is very low. Moreover, the sharp increase of dissolved CO2 concentration in the lower reaches confirmed the strong respiration of microorganisms due to the higher DO and water temperature, thus resulted in the significantly different fluctuations of DOC and SOC.</p>

scholarly journals Behavior of TiO2 and CeO2 Nanoparticles and Polystyrene Nanoplastics in Bottled Mineral, Drinking and Lake Geneva Waters. Impact of Water Hardness and Natural Organic Matter on Nanoparticle Surface Properties and Aggregation

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 721 ◽  
Author(s):  
Lina Ramirez ◽  
Stephan Ramseier Gentile ◽  
Stéphane Zimmermann ◽  
Serge Stoll
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Drinking Water Treatment ◽  
Water Hardness ◽  
Engineered Nanoparticles ◽  
Mineral Waters ◽  
Lake Geneva ◽  
Water Treatment Process ◽  
The Impact

Intensive use of engineered nanoparticles (NPs) in daily products ineluctably results in their release into aquatic systems and consequently into drinking water resources. Therefore, understanding NPs behavior in various waters from naturel to mineral waters is crucial for risk assessment evaluation and the efficient removal of NPs during the drinking water treatment process. In this study, the impact of relevant physicochemical parameters, such as pH, water hardness, and presence of natural organic matter (NOM) on the surface charge properties and aggregation abilities of both NPs and nanoplastic particles is investigated. TiO2, CeO2, and Polystyrene (PS) nanoplastics are selected, owing to their large number applications and contrasting characteristics at environmental pH. Experiments are performed in different water samples, including, ultrapure water, three bottled mineral waters, Lake Geneva, and drinking water produced from Lake Geneva. Our findings demonstrate that both water hardness and negatively charged natural organic matter concentrations, which were measured via dissolved organic carbon determination, are playing important roles. At environmental pH, when negatively charged nanoparticles are considered, specific cation adsorption is promoting aggregation so long as NOM concentration is limited. On the other hand, NOM adsorption is expected to be a key process in NPs destabilization when positively charged PS nanoplastics are considered.

Fate of effluent organic matter (EfOM) and natural organic matter (NOM) through riverbank filtration

2008 ◽  
Vol 57 (12) ◽  
pp. 1999-2007 ◽  
Author(s):  
S. K. Maeng ◽  
S. K. Sharma ◽  
A. Magic-Knezev ◽  
G. Amy
Keyword(s):  
Organic Matter ◽  
Surface Water ◽  
Natural Organic Matter ◽  
Wastewater Effluent ◽  
Riverbank Filtration ◽  
Soil Columns ◽  
Effluent Organic Matter ◽  
Bulk Organic Matter ◽  
Water And Wastewater ◽  
The Impact

Understanding the fate of effluent organic matter (EfOM) and natural organic matter (NOM) through riverbank filtration is essential to assess the impact of wastewater effluent on the post treatment requirements of riverbank filtrates. Furthermore, their fate during drinking water treatment can significantly determine the process design. The objective of this study was to characterise bulk organic matter which consists of EfOM and NOM during riverbank filtration using a suite of innovative analytical tools. Wastewater effluent-derived surface water and surface water were used as source waters in experiments with soil columns. Results showed the preferential removal of non-humic substances (i.e. biopolymers) from wastewater effluent-derived surface water. The bulk organic matter characteristics of wastewater effluent-derived surface water and surface water were similar after 5 m soil passage in laboratory column experiment. Humic-like organic matter in surface water and wastewater effluent-derived surface water persisted through the soil passage. More than 50% of total dissolved organic carbon (DOC) removal with significant reduction of dissolved oxygen (DO) was observed in the top 50 cm of the soil columns for both surface water and wastewater effluent-derived surface water. This was due to biodegradation by soil biomass which was determined by adenosine triphosphate (ATP) concentrations and heterotrophic plate counts. High concentrations of ATP in the first few centimeters of infiltration surface reflect the highest microbial activity which correlates with the extent of DOC reduction. Good correlation of DOC removal with DO and biomass development was observed in the soil columns.

Natural organic matter export from boreal catchments (the Salaca River basin, Latvia) and its influencing factors

2012 ◽  
Vol 43 (4) ◽  
pp. 330-340 ◽  
Author(s):  
Maris Klavins ◽  
Ilga Kokorite ◽  
Linda Eglite ◽  
Valery Rodinov
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
River Basin ◽  
Natural Organic Matter ◽  
Organic Matter Concentration ◽  
Runoff Regime ◽  
Discharge Regime ◽  
Type Of Land Use ◽  
The Impact ◽  
Matter Concentration

A noteworthy increase in the organic matter concentration and export, as well as water colour, in the catchments of the Salaca River has been observed during the last decades. This study investigates factors behind this increase: the impact of climate, land use and human loading changes on the concentrations and export of the organic matter in the Salaca River/Lake Burtnieks catchments. Proportion of wetlands in the river basin, type of land use, and runoff regime can be considered as the main factors influencing the organic carbon loadings. Despite a steady overall tendency of increase, considerable oscillations of organic matter loadings influenced by the changes in the river discharge regime were observed for extended periods of time.

scholarly journals Towards Water, Sodium Chloride and Natural Organic Matter Recovery from Ion Exchange Spent Brine

Membranes ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 262
Author(s):  
Maryam Haddad ◽  
Laurent Bazinet ◽  
Benoit Barbeau
Keyword(s):  
Organic Matter ◽  
Ion Exchange ◽  
Heat Loss ◽  
Natural Organic Matter ◽  
Operating Time ◽  
Resource Recovery ◽  
Membrane Distillation ◽  
Ambient Environment ◽  
Regeneration Cycle ◽  
The Impact

Despite the tremendous success of the application of anion exchange resins (IX) in natural organic matter (NOM) removal over conventional removal methods, the considerable amount of brine spent during its regeneration cycle makes its sustainability questionable. This polluting saline stream can be challenging to manage and costly to discharge. Alternatively, and with the recent shift in perception of resource recovery, the produced spent brine can no longer be seen as a polluting waste but as an unconventional source of water, minerals and nutrients. In this research, for the first time, we evaluated the effectiveness of an integrated monovalent selective electrodialysis (MSED) and direct contact membrane distillation (DCMD) system in IX spent brine desalination and resource recovery. Of particular interest were the effects of operating time on the characteristics of the monovalent permselective ion exchange membranes, the impact of the DCMD stack configuration on minimizing heat loss to the ambient environment and the efficacy of the recovered NaCl in the regenerating cycle of the exhausted IXs. Our findings demonstrated that although the recovered NaCl from the stand-alone MSED can restore nearly 60% ion exchange capacity of the exhausted IXs, coupling MSED with DCMD led to minimizing the consumption of fresh NaCl (in the IX regeneration cycle) significantly, the potential application of NOM in agriculture and diminishing the risk of the IX spent brine disposal. In addition, the initial characteristics of the ion permselective membranes were maintained after 24 h of MSED and the transmembrane flux was increased when the feed/hot compartment (in the DCMD stack) was encapsulated on two outer ends with coolant/permeate compartments as a result of less heat loss to the ambient environment.

Laboratory study on the impact of pH and salinity on the fluorescence signal of Natural Organic Matter (NOM) relevant to groundwaters from a Canadian Shield sampling site

2012 ◽  
Vol 47 (2) ◽  
pp. 131-139 ◽  
Author(s):  
Vanessa Borraro ◽  
Rémi Riopel ◽  
François Caron ◽  
Stefan Siemann
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Sampling Site ◽  
Salt Content ◽  
Canadian Shield ◽  
Salinity Range ◽  
Fluorescence Signal ◽  
Spectral Interpretation ◽  
The Impact ◽  
Three Components

Fluorescence spectroscopy with the spectral resolution routine PARAFAC is a leading tool to analyze Natural Organic Matter (NOM) in waters. This routine resolves spectra into humic-, fulvic- and protein-like components, which helps interpret the NOM dynamics in environmental systems. This work is one of the first systematic studies dealing with the impact of chemical perturbations on the fluorescence spectral interpretation of NOM. The samples, taken at two Canadian Shield locations (a shallow set and a deep set to ∼650 m), were perturbed for pH (‘titrations’ from pH 4 to 10) and salinity (from ∼0.02 to 3‰ salt content), then analyzed by fluorescence/PARAFAC. Our fluorescence signals for the three components showed no clear change with pH, as would be expected with a classic titration. The signals were reproducible between replicates for the humic- and protein-like components, but less so for the fulvic-like components. Changes of salinity only had a small impact on the fluorescence signal (a ∼2.7–3.4% signal decrease for each salinity unit, ‰) for the three components in this salinity range.

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