Natural Organic Matter (NOM) Transformations and their Effects on Water Treatment Process: A Contemporary Review

2021 ◽  
Vol 15 ◽  
Author(s):  
Manoj Kumar Karnena ◽  
Madhavi Konni ◽  
Bhavya Kavitha Dwarapureddi ◽  
Vara Saritha
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Membrane Filtration ◽  
Treatment Process ◽  
Climatic Conditions ◽  
Water And Wastewater Treatment ◽  
Water Treatment Process ◽  
Treatment Facilities ◽  
Water And Wastewater

Abstract: One of the several significant concerns related to water treatment plants is the transformation of natural organic matter (NOM) concerning quality and quantity due to the changing climatic conditions. The NOM consists of heterogeneous functionalized groups. Phenolic and carboxyl groups are the dominant groups that are pH-dependent and show a stronger affinity towards the metals. Properties of natural organic matter and trace elements govern the binding kinetics, influencing cations' binding to functionalized groups at lower pH. The water treatment process mechanisms like adsorption, coagulation, membrane filtration, and ion exchange efficiencies are sturdily influenced by the presence of NOM with cations and by the natural organic matter alone. The complexation among the natural organic matter and coagulants enhances the removal of NOM from the coagulation processes. The current review illustrates detailed interactions between natural organic matter and the potential impacts of cations on NOM in the water and wastewater treatment facilities.

scholarly journals Super-bridging Fibrous Materials for Water Treatment: Impacts on Removal of Plastic Particles, Phosphorus and Natural Organic Matter

2021 ◽  
Author(s):  
Mathieu Lapointe ◽  
Heidi Jahandideh ◽  
Jeffrey Farner ◽  
Nathalie Tufenkji
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Natural Organic Matter ◽  
Emerging Contaminants ◽  
Settling Tank ◽  
Process Unit ◽  
Fibrous Materials ◽  
Floc Size ◽  
Sludge Waste ◽  
Treatment Facilities

Aggregation combined with gravitational separation is the most commonly used method to treat water globally, but it carries a significant economic and environmental burden as the chemicals used in the process (e.g., coagulants) generate ~8 million tons of metal-based sludge waste annually. To simultaneously deal with the issues of process sustainability, cost, and efficiency, we developed materials reengineered from pristine or waste fibers to serve as super-bridging agents, adsorbents, and ballast media. This study shows that these sustainable fiber-based materials considerably increased the floc size (~6630 µm) compared to conventional physicochemical treatment using a coagulant and a flocculant (~520 µm). The fiber-based materials also reduced coagulant (up to 40%) and flocculant usage (up to 60%). Moreover, the unprecedented size of flocs produced using fiber-based materials (up to ~13 times larger compared to conventional treatment) enabled easy floc removal by screening, thereby eliminating the need for a settling tank, a large and costly process unit. Our results show that fiber-based materials can be effective solutions at removing classical (e.g., natural organic matter (NOM) and phosphorus) and emerging contaminants (e.g., microplastics and nanoplastics). Due to their large size (> 3000 µm), some Si-grafted and Fe-grafted fiber-based materials can be easily recovered from settled/screened sludge and reused multiple times for coagulation/flocculation. Our results also show that these materials could be used in synergy with coagulants and flocculants to improve settling in existing water treatment processes. Furthermore, these reusable materials combined with separation via screening could allow global water treatment facilities to reduce their capital and operating costs as well as their environmental footprint.

The effect of nitrate and organic matter upon mobility of selenium in groundwater and in a water treatment process

1990 ◽  
Vol 49 (3-4) ◽  
pp. 251-272 ◽  
Author(s):  
Oleh Weres ◽  
Harry R. Bowman ◽  
Aaron Goldstein ◽  
Emily C. Smith ◽  
Leon Tsao ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Treatment Process ◽  
Water Treatment Process

Emergency Treatment Measures for Sudden Pollution Incidents in Source Water with some Contaminants: A Review

2013 ◽  
Vol 781-784 ◽  
pp. 1950-1953 ◽  
Author(s):  
Hong Tao Wang ◽  
Xue Bin Jia ◽  
Dong Mei Liu ◽  
Zhi Wei Wang ◽  
Yun Hao Pan
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Water Purification ◽  
Seasonal Variability ◽  
Emergency Treatment ◽  
Treatment Process ◽  
Source Water ◽  
High Concentration ◽  
Water Treatment Process ◽  
Treatment Measures

Source water polluted by algae, ammonium and organic matter has been studied for many years. Sudden pollution incidents of source water have been reported across the whole country. Seasonal variability of rainfall across China has resulted in floods or droughts, thus incurred the high concentration of algae, ammonium and organic matter, causing severe challenges to the conventional water purification facilities. However, the conventional water treatment process is often unavailable to keep the safety of source water for drinking when sudden pollution occurs. Meanwhile, byproducts are often to be found over the whole treatment process, it is high time that researchers took effective measures to deal with this problem. In the present work, an overview of the recent research dealing with source water suddenly polluted by algae, ammonium and organic matter is presented.

Oxidation of manganese in drinking water systems using potassium permanganate

2002 ◽  
Vol 2 (5-6) ◽  
pp. 173-178
Author(s):  
R. Raveendran ◽  
B. Chatelier ◽  
K. Williams
Keyword(s):  
Water Treatment ◽  
Surface Water ◽  
Potassium Permanganate ◽  
Treatment Process ◽  
Chemical Oxidation ◽  
Water Reservoirs ◽  
Advantages And Disadvantages ◽  
Water Treatment Process ◽  
Treatment Techniques ◽  
Treatment Facilities

South Gippsland Region Water Authority experience manganese problems in most of their surface water reservoirs. Manganese is present in the form of manganese(II) ions and manganic dioxide solids. At low dissolved oxygen levels, the manganic dioxide is reduced to the manganese(II) ion. If not oxidised, the manganese(II) ion escapes through water treatment facilities and enters the supply system. Once in the system, the manganese ions are gradually oxidised to insoluble manganic dioxide causing dirty water problems which can stain clothes and bathing equipment. As part of the water treatment process, manganese(II) can be oxidised to insoluble manganic oxide and then removed by clarification and filtration. Generally, oxidation can be achieved by aeration or chemical oxidation by addition of an oxidising agent such as potassium permanganate (KMnO4) or chlorine. However, due to fluctuations of manganese levels in raw water, treatment techniques are often very difficult. This paper shares the experiences of South Gippsland Water in using potassium permanganate as part of the water treatment process to remove manganese in its surface water reservoirs. Whilst consideration is given to the advantages and disadvantages of alternative oxidation methods, this paper primarily focuses on the use of KMnO4 to remove manganese and the resulting analytical problems associated with monitoring manganese levels.

scholarly journals Complexation of Antimony with Natural Organic Matter: Performance Evaluation during Coagulation-Flocculation Process

2019 ◽  
Vol 16 (7) ◽  
pp. 1092 ◽  
Author(s):  
Muhammad Inam ◽  
Rizwan Khan ◽  
Du Park ◽  
Sarfaraz Khan ◽  
Ahmed Uddin ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Treatment Process ◽  
High Concentration ◽  
Isotherm Study ◽  
Toc Removal ◽  
Water Treatment Process ◽  
Flocculation Process ◽  
Hydrophobic Ligand ◽  
Complexation Ability

The presence of natural organic matter (NOM) in drinking water sources can stabilize toxic antimony (Sb) species, thus enhancing their mobility and causing adverse effects on human health. Therefore, the present study aims to quantitatively explore the complexation of hydrophobic/hydrophilic NOM, i.e., humic acid (HA), salicylic acid (SA), and L-cysteine (L-cys), with Sb in water. In addition, the removal of Sb(III, V) species and total organic carbon (TOC) was evaluated with ferric chloride (FC) as a coagulant. The results showed a stronger binding affinity of hydrophobic HA as compared to hydrophilic NOM. The optimum FC dose required for Sb(V) removal was found to be higher than that for Sb(III), due to the higher complexation ability of hydrophobic NOM with antimonate than antimonite. TOC removal was found to be higher in hydrophobic ligands than hydrophilic ligands. The high concentration of hydrophobic molecules significantly suppresses the Sb adsorption onto Fe precipitates. An isotherm study suggested a stronger adsorption capacity for the hydrophobic ligand than the hydrophilic ligand. The binding of Sb to NOM in the presence of active Fe sites was significantly reduced, likely due to the adsorption of contaminants onto precipitated Fe. The results of flocs characteristics revealed that mechanisms such as oxidation, complexation, charge neutralization, and adsorption may be involved in the removal of Sb species from water. This study may provide new insights into the complexation behavior of Sb in NOM-laden water as well as the optimization of the coagulant dose during the water treatment process.

scholarly journals Forecasting and Regulating of the Natural Organic Matter in the Volga Water Supply Source of Moscow

2016 ◽  
pp. 48
Author(s):  
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Water Supply ◽  
Natural Organic Matter ◽  
Supply System ◽  
Water Supply System ◽  
Water Color ◽  
Supply Source ◽  
Ivankovo Reservoir ◽  
Treatment Facilities

The main regularities of water color and permanganate oxidizability transformation in the Volga water supply source of Moscow reservoir system have been found. Regularities of the natural organic matter content decrease in terms of water color and permanganate oxidizability within individual segments of the water supply system. The most intensive organic matter transformation within the system reservoirs occurs in the slow-flow Uchinsk reservoir where the color and permanganate oxidizability values maximum is observed during spring period. On the basis of the many-year observations results obtained in the water supply system water bodies a scheme of statistic forecasting of water color and oxidizability at water treatment facilities intake points with tree months lead time has been developed. The forecast is based on multiple linear regression equation linking the organic matter values in the Ivankovo reservoir tributaries and the same at the water treatment facilities at the closure link of the system (Uchinsk reservoir). The carried out comparison of the forecast results with the independent observation data shown a quite satisfactory agreement between the forecasted and observed organic matter values. A possibility to control the Volga River water color with low-color waters discharges from Vazuza reservoir was demonstrated with a simple balance model. As a result of the model calculations we obtained a nomogram enabling to compute the color decrease in a tribute to Ivankovo reservoir in dependence on the color difference between the Volga water and waters discharged from Vazuza reservoir provided we have pre-set proportion of water flow from these sources.

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