Effectiveness of natural coagulants from non-plant-based sources for water and wastewater treatment—a review

Saranya, P.; Ramesh, Sivalingam; Gandhimathi, R.

doi:10.1080/19443994.2013.812993

Cited by 38 publications

(18 citation statements)

References 61 publications

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“…In the case of natural polymers like alginate, it may generally follow the mechanism (d). Calcium alginate gel combines with the dispersed particle irrespective of the charge and leads to flocculation [23]. At the end of these loops, it may attach with another particle and forms a bridge between the two particles, which is known as the bridging mechanism of floc-culation.…”

Section: Coagulation Mechanismmentioning

confidence: 99%

“…The coagulation process can be enhanced by any one of the mechanism: charge neutralization along with bridging the particles or by the gel formation of calcium and alginate. Calcium alginate gel combines with the dispersed particle irrespective of the charge and leads to flocculation [23]. Grant et al [24] reported that when natural long-chain polysaccharides 21 , it forms an egg box structure which leads to a stable gel formations.…”

Section: Coagulation Mechanismmentioning

confidence: 99%

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Removal of sulphur black dye from its aqueous solution using alginate from Sargassum sp. (Brown algae) as a coagulant

Vijayaraghavan

Shanthakumar

2015

Env Prog and Sustain Energy

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This study deals with the coagulation potential of alginate extracted from marine algae Sargassum sp. for the removal of sulphur black dye from its aqueous solution. The alginate extraction was found to be efficient (44.8%) and the extracted alginate was characterized by Fourier transform infrared spectroscopy and Scanning electron microscopy techniques. Batch experiments (coagulation test) were performed to investigate the effect of alginate dose (10‐60 mg/L), calcium dose (1‐6 g/L) and initial dye concentration (50‐250 mg/L) on dye removal. The maximum dye removal (98.2%) was achieved under the optimal conditions of the initial dye concentration 200 mg/L, Calcium dose 6 g/L, and alginate dose 30 mg/L. The kinetics study for the coagulation process was carried out and found that it suitably fits in second‐order kinetics model. The literature on application of algal alginate for various wastewater treatment methods were compared with the present study and the results obtained revealed that the alginate from Sargassum sp. can be used as an efficient coagulant for the removal of sulphur black dye. © 2015 American Institute of Chemical Engineers Environ Prog, 34: 1427–1434, 2015

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Section: Coagulation Mechanismmentioning

confidence: 99%

Section: Coagulation Mechanismmentioning

confidence: 99%

Removal of sulphur black dye from its aqueous solution using alginate from Sargassum sp. (Brown algae) as a coagulant

Vijayaraghavan

Shanthakumar

2015

Env Prog and Sustain Energy

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“…These disadvantages have recently stimulated researches on the exploration of potential natural coagulant. Various nonplant [e.g., chitosan (Alaba et al 2018), alginate (Saranya et al 2014)] and plant-based coagulants, such as Ipomoea dasysperma (Sanghi et al 2006), Moringa stenopelata (Dalvand et al 2016), Acacia mearnsii de Wild (Beltran-Heredia et al 2011), and Plantago ovata (Ramavandi and Farjadfard 2014), have been proposed as natural coagulant to treat textile wastewater.…”

Section: Introductionmentioning

confidence: 99%

Removal of Congo red aqueous solution using Leucaena leucocephala seed’s extract as natural coagulant

et al. 2019

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Coagulation is a well-known technology applied in water and wastewater treatment. Inorganic salts, such as alum, ferrous sulfate, and polyaluminum chloride, are usually used. It is widely known that utilization of these inorganic coagulants poses several disadvantages, such as high coagulant cost and high sludge volume that increase water treatment expenses. The use of alum also poses health risk to human as it may cause degenerative diseases. In order to minimize these disadvantages, the use of various coagulants from natural resources has been recently proposed. In this research, study was performed on the extraction and use of a potential natural coagulant (Leucaena leucocephala) seed kernel as natural coagulant. Leucaena seed kernel was extracted at various NaCl concentrations (0-5 mol L −1). Extract with highest protein content obtained at NaCl concentration of 3 mol L −1 was further used to treat a synthetic wastewater model substance (Congo red solution) at various pH (2-10) and dosage (2-40 mL L −1). This natural coagulant successfully removed 99.9% of the color at pH 3 and dosage 10 mL L −1 , with only half sludge volume discharged when compared to alum. The result suggests that leucaena is a promising natural coagulant for water and wastewater treatment.

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“…However, the coagulation performance of metal coagulants may not satisfy the increasing demand for NOM removal, and thus numerous researchers have focused on the use of natural coagulants in drinking water treatment [18,19,20,21].…”

Section: Introductionmentioning

confidence: 99%

Removal of natural organic matter and trihalomethane minimization by coagulation/flocculation/filtration using a natural tannin

Bongiovani

Camacho

Coldebella

et al. 2016

Desalination and Water Treatment

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2015): Removal of natural organic matter and trihalomethane minimization by coagulation/flocculation/filtration using a natural tannin, Desalination and Water Treatment,Natural organic matter (NOM) is found in all surface, ground, and soil waters. The presence of NOM causes many problems in drinking water treatment processes. Minimization of the disinfection byproducts precursors or effective removal of NOM has emerged as a critical issue in the production of high quality drinking water from surface water. The objective of the present investigation is to explore the capacity of tannin to remove NOM in coagulation/flocculation/filtration/chlorination process from surface water in order to minimize total trihalomethanes (TTHM) formation. For the tests, raw water from Pirapó River Basin (Maringá, Paraná, Brazil) was used. Optimization of coagulation/flocculation tests was performed in jar test with dosage of Tanfloc 0.5% as coagulant ranging from 2.5 to 15 mg L −1 . The parameters analyzed were color, turbidity, compounds with absorption at UV-254 nm, dissolved organic carbon (DOC), and zeta potential. In view of the statistical analysis results, Tanfloc with dosage of 7.5 mg L −1 was chosen as coagulant for the follow-up tests of coagulation/flocculation/filtration/chlorination. The implementation of slow sand filtration after the sedimentation stage achieves almost 100% removal of turbidity. Besides, the combination of coagulation/flocculation/filtration/chlorination using this tannin improved NOM removal according to UV 254nm and DOC parameters, minimizing TTHM formation. The amount of TTHM in drinking water varied from 31.3 to 47.7 μg L −1 , while the amount of raw water TTHM was found to be 4.0 μg L −1 . Although these values lie below the ones stipulated by Ordinance no. 2914/2011 for TTHM limits, it is advisable to check periodically this parameter. In view of these results, this tannin can be recommended as a promising agent for surface water treatment.

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Effectiveness of natural coagulants from non-plant-based sources for water and wastewater treatment—a review

Cited by 38 publications

References 61 publications

Removal of sulphur black dye from its aqueous solution using alginate from Sargassum sp. (Brown algae) as a coagulant

Removal of sulphur black dye from its aqueous solution using alginate from Sargassum sp. (Brown algae) as a coagulant

Removal of Congo red aqueous solution using Leucaena leucocephala seed’s extract as natural coagulant

Removal of natural organic matter and trihalomethane minimization by coagulation/flocculation/filtration using a natural tannin

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