Distribution of Natural Organic Matter (NOM) in Full-scale Drinking Water Utilities of India in Eastern Region - Challenges and Issues

2021 ◽  
pp. 134-140
Author(s):  
Jaydev Kumar Mahato ◽  
S. K. Gupta
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Full Scale ◽  
Water Utilities ◽  
Eastern Region

Application of Nanomaterials in Water Treatment: Arsenic and Natural Organic Matter Removal

2020 ◽  
Vol 14 ◽  
Author(s):  
Jasmina Nikić ◽  
Jelena Molnar Jazić ◽  
Malcolm Watson ◽  
Jasmina Agbaba
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Full Scale ◽  
The Body ◽  
Magnetic Nanomaterials ◽  
Magnetic Composites ◽  
Environmentally Sustainable ◽  
Contaminated Drinking Water ◽  
Metal Organic

Background:: Globally, around 150 million people are still supplied with arsenic contaminated drinking water. As well as arsenic, the groundwaters effected often contain problematic concentrations of natural organic matter (NOM), which plays an important role in releasing As into the aquifer. This review thus explores the recent literature relating to the application of various nanomaterials to solve these drinking water supply problems, and highlights the work which still needs to be done. Methods:: After an extensive initial search of the literature, papers were selected based on their quality and relevance to the topic of this review: the use of magnetic nanomaterials based on pure magnetic materials, magnetic composites of carbon/graphene/biochars, polymeric matrices, metal-organic frameworks and mixed-oxide magnetic nanocomposites, as As adsorbents and as photocatalysts for NOM removal. Results:: 160 papers relating to the application of nanomaterials for As removal were reviewed, as well as 38 papers covering photocatalysts for NOM removal. These papers were organised by type of nanomaterial, and their important findings summarised. Although many authors have demonstrated effective solutions in the laboratory, the following areas still need to be addressed: the challenges posed by larger pilot and full scale continuously operated processes; the treatment of complex natural water matrices; which technologies will be required to economically separate nanoparticles from the treated water; whether the nanoparticles will be more economically and environmentally sustainable than other techniques available. Conclusion:: Despite these significant gaps in the literature, the body of work carried out thus far, as summarised in this review paper, strongly suggests that full scale treatment solutions applying (magnetic) nanomaterials may prove highly effective in the future for both arsenic and NOM removal.

Coagulation/flocculation/ultrafiltration for natural organic matter removal in drinking water production

2004 ◽  
Vol 4 (5-6) ◽  
pp. 215-222 ◽  
Author(s):  
A.R. Costa ◽  
M.N. de Pinho
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Membrane Surface ◽  
Water Production ◽  
Cellulose Acetate Membranes ◽  
Wide Range ◽  
Drinking Water Production

Membrane fouling by natural organic matter (NOM), namely by humic substances (HS), is a major problem in water treatment for drinking water production using membrane processes. Membrane fouling is dependent on membrane morphology like pore size and on water characteristics namely NOM nature. This work addresses the evaluation of the efficiency of ultrafiltration (UF) and Coagulation/Flocculation/UF performance in terms of permeation fluxes and HS removal, of the water from Tagus River (Valada). The operation of coagulation with chitosan was evaluated as a pretreatment for minimization of membrane fouling. UF experiments were carried out in flat cells of 13.2×10−4 m2 of membrane surface area and at transmembrane pressures from 1 to 4 bar. Five cellulose acetate membranes were laboratory made to cover a wide range of molecular weight cut-off (MWCO): 2,300, 11,000, 28,000, 60,000 and 75,000 Da. Severe fouling is observed for the membranes with the highest cut-off. In the permeation experiments of raw water, coagulation prior to membrane filtration led to a significant improvement of the permeation performance of the membranes with the highest MWCO due to the particles and colloidal matter removal.

Triclosan removal by NF from a real drinking water source – Effect of natural organic matter

2016 ◽  
Vol 283 ◽  
pp. 330-337 ◽  
Author(s):  
Abdullah Ogutverici ◽  
Levent Yilmaz ◽  
Ulku Yetis ◽  
Filiz B. Dilek
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Water Source ◽  
Drinking Water Source ◽  
Source Effect
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