Synthesising tannin-based coagulants for water and wastewater application: A review

Ibrahim, Azreen; Yaser, Abu Zahrim; Lamaming, Junidah

doi:10.1016/j.jece.2020.105007

Cited by 63 publications

(24 citation statements)

References 98 publications

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“…Bioactive compounds have found a range of applications in bioremediation sectors as well, in the form of coagulants (Ibrahim et al 2021), biofilms (Mugge et al 2021), bioactive extracts (Zerrifi et al 2018), and so on. A wide range of bioactive compounds obtained from various sources has shown promising activity against harmful algal blooms (HAB), including α-linolenic, oleic, and palmitic acids from Botryococcus braunii, diethyl phthalate from Stoechospermum marginatum, and so on (Zerrifi et al 2018(Zerrifi et al , 2021.…”

Section: Bioremediation Sectormentioning

confidence: 99%

A critical look at challenges and future scopes of bioactive compounds and their incorporations in the food, energy, and pharmaceutical sector

Pai

Hebbar

Selvaraj

2022

Environ Sci Pollut Res

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Bioactive compounds refer to secondary metabolites extracted from plants, fungi, microbes, or animals. Besides having pharmacological or toxicological effects on organisms leading to utilization in food and pharmaceutical industries, the discovery of novel properties of such compounds has led to the diversification of their applications, ranging from cosmetics and functionalized biomaterials to bioremediation and alternate fuels. Conventional time-consuming and solvent-intensive methods of extraction are increasingly being replaced by green solvents such as ionic liquids, supercritical fluids, and deep eutectic solvents, as well as non-conventional methods of extraction assisted by microwaves, pulse electric fields, enzymes, ultrasound, or pressure. These methods, along with advances in characterization and optimization strategies, have boosted the commercial viability of extraction especially from agrowastes and organic residues, promoting a sustainable circular economy. Further development of microfluidics, optimization models, nanoencapsulation, and metabolic engineering are expected to overcome certain limitations that restrict the growth of this field, in the context of improving screening, extraction, and economy of processes, as well as retaining biodiversity and enhancing the stability and functionality of such compounds. This review is a compilation of the various extraction and characterization methods employed for bioactive compounds and covers major applications in food, pharmacy, chemicals, energy, and bioremediation. Major limitations and scope of improvement are also discussed. Graphical abstract

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Section: Bioremediation Sectormentioning

confidence: 99%

A critical look at challenges and future scopes of bioactive compounds and their incorporations in the food, energy, and pharmaceutical sector

Pai

Hebbar

Selvaraj

2022

Environ Sci Pollut Res

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“…The addition of cationic substances, such as tannin-based coagulants, makes the particles unstable [17]. The long chains of tannin-based coagulant polymers contain positively charged amino groups [18], and characterize coagulants as cationic coagulants. Organo-floc (OF) is a cationic coagulant that can destabilize anionic colloids by being positively charged [7], [19], [20] by the presence of phenolic groups [18].…”

Section: Coagulant Dosage Required For Treatment Of Artificial Sewagementioning

confidence: 99%

“…The long chains of tannin-based coagulant polymers contain positively charged amino groups [18], and characterize coagulants as cationic coagulants. Organo-floc (OF) is a cationic coagulant that can destabilize anionic colloids by being positively charged [7], [19], [20] by the presence of phenolic groups [18]. This shows that the zeta potential value increases with increasing coagulant dose.…”

Section: Coagulant Dosage Required For Treatment Of Artificial Sewagementioning

confidence: 99%

“…4 is likely due to proton dissociation from the tannin protonated tertiary nitrogen. In highly acidic conditions, quaternary nitrogen is introduced into the tannin polyphenol structure by reaction with an amines and aldehydes [18]. Even in this state, Ibrahim and Yaser [7] also state that a bridging mechanism is likely to occur.…”

Section: Fig 3 -Artificial Sewage Before and After Coagulation At 125 Mg/l Of Coagulant Dosagementioning

confidence: 99%

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Decolourisation of Sewage using Commercial Tannin-Based Coagulant

Ibrahim

Lamaming

Nakolas

et al. 2021

EmAIT

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In this work, the effectiveness of removing colour and total suspended solid (TSS) from complex organic particulate artificial sewage (COPAS) via the coagulation process was studied. Organo-floc (OF), a tannin-based coagulant derived from the plant was used as a coagulant. OF was applied in a jar test experiment at the various dosages at 57 rpm for 5 min, and 30 min sedimentation time to find out the optimum dosage for colour and TSS removal. Zeta potential, pH and conductivity were also analysed. Experiment with tannin dosage of 125 ppm resulted in the highest colour and TSS removal of 94% and 79%, respectively. Organo-floc showed promising results in decolourisation and TSS removal from artificial sewage.

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“…Further, tanninbased destabilizing reagents, mostly produced from tree tissues (leaves, wood, or bark), have also been employed in drinking water and industrial effluent treatment units. These compounds adsorb onto the particles surfaces by a combination of electrostatic attraction, hydrogen bonding, and/or polymeric bridges, which depend on their charge density, molecular weight, and branching [6][7][8].…”

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confidence: 99%

On the Use of Iron Chloride and Starch for Clarification in Drinking Water Treatment

Cep¹,

Ha²,

Azevedo³

et al. 2021

Int J Water Wastewater Treat

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In drinking water treatment plants, chemical reagents are employed to aggregate and remove suspended particles. However, not all reagents are eco-friendly and exists concerns over environmental, economic, and health issues. This study shows features of the sustainability of commercial coagulants/flocculants and presents experimental research on floc characterization and settling of dispersed solids with a combination of Ferric Chloride (FeCl3 ) and gelatinized starch. Bench studies were conducted using kaolin suspensions and results were validated with raw water collected from a river (Rio dos Sinos, Brazil). Flocculation indexes, floc structure, and residual turbidities were compared with Polyaluminum Chloride (PAC), as a reference. All techniques showed that the combination of FeCl3 and starch formed well-structured, larger, and more settleable flocs than those produced with PAC. Superficial loadings, in a continuous separation tank (2 to 4 m.h-1) were studied with and without lamellae. Best results were obtained with 15 mg.L-1 Fe3+ and 10 mg.L-1 starch, with a velocity gradient, G, of 60 s-1 in the slow mixing and with 60° inclined lamellae spaced 1.3 cm apart. Best conditions were applied to the clarification of the raw water and again, due to the rapid settling of flocs with FeCl3 and starch, better results were obtained compared to PAC. A turbidity reduction of 94% and a residual value of 2.5 NTU with superficial loadings of 3 m.h-1 were obtained. Results were discussed in terms of interfacial and operating parameters and a promising potential for the combination of FeCl3 with starch for solid/liquid separation was envisaged.

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Synthesising tannin-based coagulants for water and wastewater application: A review

Cited by 63 publications

References 98 publications

A critical look at challenges and future scopes of bioactive compounds and their incorporations in the food, energy, and pharmaceutical sector

A critical look at challenges and future scopes of bioactive compounds and their incorporations in the food, energy, and pharmaceutical sector

Decolourisation of Sewage using Commercial Tannin-Based Coagulant

On the Use of Iron Chloride and Starch for Clarification in Drinking Water Treatment

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