Removal of Dissolved Natural Organic Matter from Source Water with Alum Coagulation

Control of disinfection by-products during water treatment is primarily achieved by reducing the levels of organic precursor species prior to chlorination. Many waters contain natural organic matter at levels up to 15 mg L-1; therefore it is necessary to have a range of control methods to support conventional coagulation. Advanced oxidation processes are such processes and in this paper the Fenton and photo-Fenton processes along with photocatalysis are assessed for their NOM removal potential. The performance of each process is shown to be dependent on pH and chemical dose as well as the initial NOM concentration. Under optimum conditions the processes achieved greater than 90% removal of DOC and UV254 absorbance. This removal led to the THMFP of the source water being reduced from 140 to below 10 mg L-1, well below UK and US standards. An economic assessment of the processes revealed that currently such processes are not economic. With advances in technology and tightening of water quality standards these processes should become economically feasible options.

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Pretreatment of natural organic matter to control biological stability

Environmental Science Water Research & Technology ◽

10.1039/c5ew00235d ◽

2016 ◽

Vol 2 (2) ◽

pp. 298-303 ◽

Cited By ~ 1

Author(s):

Mahdi Bazri ◽

Madjid Mohseni

Keyword(s):

Molecular Weight ◽

Organic Matter ◽

Molecular Weight Distribution ◽

Natural Organic Matter ◽

Weight Distribution ◽

Biological Stability ◽

Alum Coagulation

Impacts of UV/H2O2and alum coagulation on NOM molecular weight distribution and subsequent biostability of water were investigated.

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Characterization and removal of natural organic matter from slow sand filter effluent followed by alum coagulation

Applied Water Science ◽

10.1007/s13201-018-0671-4 ◽

2018 ◽

Vol 8 (1) ◽

Cited By ~ 3

Author(s):

Euis Nurul Hidayah ◽

Yung-Chen Chou ◽

Hsuan-Hsien Yeh

Keyword(s):

Organic Matter ◽

Natural Organic Matter ◽

Sand Filter ◽

Slow Sand Filter ◽

Alum Coagulation

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Study on Transformation of Natural Organic Matter in Source Water during Chlorination and Its Chlorinated Products using Ultrahigh Resolution Mass Spectrometry

Environmental Science & Technology ◽

10.1021/es203587q ◽

2012 ◽

Vol 46 (8) ◽

pp. 4396-4402 ◽

Cited By ~ 87

Author(s):

Haifeng Zhang ◽

Yahe Zhang ◽

Quan Shi ◽

Jianying Hu ◽

Mengqiao Chu ◽

...

Keyword(s):

Mass Spectrometry ◽

Organic Matter ◽

Natural Organic Matter ◽

Source Water ◽

Ultrahigh Resolution ◽

Resolution Mass

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The Case for LED-UVC as a Primary Disinfectant for Small Sustainable Drinking Water Systems

MATEC Web of Conferences ◽

10.1051/matecconf/201928005014 ◽

2019 ◽

Vol 280 ◽

pp. 05014

Author(s):

Hadjeres Hichem ◽

M. Pradhanang Soni ◽

Boving Thomas ◽

Meadows Maxwell ◽

Benzerrouk Souheil

Keyword(s):

Drinking Water ◽

Organic Matter ◽

Natural Organic Matter ◽

Uv Irradiation ◽

Water Systems ◽

Source Water ◽

Total Coliforms ◽

Drinking Water Systems

High loads of natural organic matter (NOM) in source water increase levels of toxic byproducts during disinfection, including trihalomethanes (THMs) which are formed when NOM is chlorinated. This study explores the efficacy of using UVC-LED as a primary disinfectant, with lower concentrations of chlorine used as a secondary disinfectant. Both treatment trains with conventional chlorination and UV irradiation with low chlorination reduced total coliforms and E. Coli counts to less than 1 Cfu/100 ml. UV with low chlorination produced approximately 4.6 times less THMs compared to conventional chlorination.

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