Effect of bioflocculants on the coagulation activity of alum for removal of trihalomethane precursors from low turbid water
| Autor: | Brijesh Kumar Mishra, Bramha Gupta, Abhrajyoti Tarafdar, Tanwi Priya |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Environmental Engineering
0208 environmental biotechnology chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Water Purification Absorbance chemistry.chemical_compound Dissolved organic carbon Chlorine Environmental Chemistry Organic chemistry Coagulation (water treatment) Reactivity (chemistry) 0105 earth and related environmental sciences General Environmental Science Total organic carbon Alum General Medicine 020801 environmental engineering Disinfection Trihalomethane chemistry Environmental chemistry Alum Compounds Adsorption Hydrophobic and Hydrophilic Interactions Water Pollutants Chemical Trihalomethanes |
| Zdroj: | Journal of environmental sciences (China). 70 |
| ISSN: | 1001-0742 |
| Popis: | Reactivity of chlorine towards hydrophobic groups present in natural organic matter (NOM) provokes the formation of carcinogenic disinfection byproducts such as trihalomethanes in chlorinated water. The present study aimed to investigate the variations in coagulant activity of alum using two different bioflocculants (coagulant aid) namely, Moringa oleifera and Cyamopsis tetragonoloba for the removal of hydrophobic fractions of NOM and subsequent chlorine consumption by treated water. Effect of dual coagulants on trihalomethane surrogate parameters such as total organic carbon, dissolved organic carbon, UV absorbing materials and prominent hydrophobic species such as phenolic groups along with aromatic chromophores, polyhydroxy aromatic moiety have also been studied. The concept of differential spectroscopy and absorbance slope index has been employed to understand the combined effects of alum-bioflocculants on the reactivity of NOM with chlorine. Our result shows that the combination of alum and C. tetragonoloba is more efficient for reducing trihalomethane surrogates from chlorinated water as compared to M. oleifera. C. tetragonoloba elicited synchronized effects of sweep coagulation and particle bridging-adsorption which eventually facilitated efficient removal of hydrophobic fractions of NOM. The variation in the mechanistic approach of bioflocculants was due to the presence of cationic charge on M. oleifera and adhesive property of C. tetragonoloba. |
| Databáze: | OpenAIRE |
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