Molecular weight-dependent adsorption fractionation of natural organic matter on ferrihydrite colloids in aquatic environment

2019 ◽  
Vol 363 ◽  
pp. 356-364 ◽  
Author(s):  
Huacheng Xu ◽  
Li Ji ◽  
Ming Kong ◽  
Helong Jiang ◽  
Jie Chen
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Aquatic Environment

Advanced oxidation processes: flowsheet options for bulk natural organic matter removal

2004 ◽  
Vol 4 (4) ◽  
pp. 113-119 ◽  
Author(s):  
C.A. Murray ◽  
S.A. Parsons
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Natural Organic Matter ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Oxidation Processes

Advanced oxidation processes have been reported to have the potential to remove natural organic matter from source waters. Of these Fenton's reagent, photo-Fenton's reagent and titanium dioxide photocatalysis are the three most promising processes. Compared to conventional coagulation/flocculation processes they have higher removal efficiencies in terms of both dissolved organic carbon and UV254 absorbance. Under optimum reaction conditions all three remove over 80% dissolved organic carbon and 0% UV254 absorbance. In addition the enhanced removal of natural organic matter leads to a corresponding reduction in the formation of disinfection by-products following chlorination of the treated water. Advanced oxidation processes give enhanced removal of organic species ranging from low to high molecular weight while coagulation/flocculation is inefficient at removing low molecular weight species. One additional benefit is all three processes produce less residuals compared to conventional coagulation, which is advantageous as the disposal of such residuals normally contributes a large proportion of the costs at water treatment works.

Aggregation kinetics of microplastics in aquatic environment: Complex roles of electrolytes, pH, and natural organic matter

2018 ◽  
Vol 237 ◽  
pp. 126-132 ◽  
Author(s):  
Shuocong Li ◽  
Hong Liu ◽  
Rui Gao ◽  
Abliz Abdurahman ◽  
Juan Dai ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Aquatic Environment ◽  
Aggregation Kinetics ◽  
Kinetics Of

scholarly journals Removal of Trihalomethane Precursors by Nanofiltration in Low-SUVA Drinking Water

Water ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1370 ◽  
Author(s):  
Yael Dubowski ◽  
Roni Greenberg-Eitan ◽  
Menachem Rebhun
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Low Molecular Weight ◽  
Water Recovery ◽  
Formation Potential ◽  
Pressure Water ◽  
Membrane Type ◽  
Hydrophilic Organic Matter ◽  
By Products

Trihalomethanes (THMs) are prevalent disinfection by-products. High THM formation is usually associated with natural organic matter with high molecular weight and aromatic characteristics, which is efficiently removed by nanofiltration (NF). In the Sea of Galilee and the Israeli National Water Carrier (NWC), water shows high THM formation potential, although it mainly contains low molecular weight and hydrophilic organic matter with low aromaticity. In the present study, NF removal abilities were tested on treated NWC water using three different spiral wound membranes (NF90, NF270, and DL). Rejections and fluxes were tested as a function of pressure, water recovery, and membrane type. Feed and permeate dissolved organic carbon (DOC), UVA254, total THM formation (THMF), and total THM formation potential (THMFP), as well as alkalinity, conductivity, hardness, Ca2+, Mg2+, and Cl− were measured to evaluate rejection and THM formation reduction. The results demonstrated that NF can efficiently remove natural organic matter (NOM) and reduce THM formation, even in this challenging type of water. At low water recovery, membranes showed average rejection of about 70–85% for THMFP and THM. Upon elevating recovery, average THM and THMFP rejection decreased to 55–70%, with THM content still well below regulation limits. Of the membranes tested, the higher permeability of NF270 appears to make it economically favorable for the applications tested in this work.

Effects of natural organic matter on the photolysis of tetracycline in aquatic environment: Kinetics and mechanism

Chemosphere ◽  
2021 ◽  
Vol 263 ◽  
pp. 128338
Author(s):  
Chao Song ◽  
Kai-Xin Zhang ◽  
Xiao-Juan Wang ◽  
Shan Zhao ◽  
Shu-Guang Wang
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Aquatic Environment ◽  
Kinetics And Mechanism

scholarly journals Transformation of CuO Nanoparticles in the Aquatic Environment: Influence of pH, Electrolytes and Natural Organic Matter

Nanomaterials ◽  
2017 ◽  
Vol 7 (10) ◽  
pp. 326 ◽  
Author(s):  
Cheng Peng ◽  
Chensi Shen ◽  
Siyuan Zheng ◽  
Weiling Yang ◽  
Hang Hu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Aquatic Environment ◽  
Cuo Nanoparticles ◽  
Influence Of Ph ◽  
Environment Influence
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