Chitosan as a Drinking Water Treatment Coagulant

Pontius, Frederick W.

doi:10.11648/j.ajce.20160405.11

Cited by 38 publications

(20 citation statements)

References 9 publications

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“…However, similarly to starch, it is insoluble in water, and it must be modified to increase its applicability and flocculating activity. There are only a few reports [ 5 , 88 , 89 ] with the use of this polymer in its unmodified form. Al-Manhel et al [ 89 ] studied application of chitosan dissolved in acetic acid in purification of water from the local river.…”

Section: Bio-based Polysaccharide Flocculants For Water Treatmentmentioning

confidence: 99%

Recent Achievements in Polymer Bio-Based Flocculants for Water Treatment

2020

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Polymer flocculants are used to promote solid–liquid separation processes in potable water and wastewater treatment. Recently, bio-based flocculants have received a lot of attention due to their superior advantages over conventional synthetic polymers or inorganic agents. Among natural polymers, polysaccharides show many benefits such as biodegradability, non-toxicity, ability to undergo different chemical modifications, and wide accessibility from renewable sources. The following article provides an overview of bio-based flocculants and their potential application in water treatment, which may be an indication to look for safer alternatives compared to synthetic polymers. Based on the recent literature, a new approach in searching for biopolymer flocculants sources, flocculation mechanisms, test methods, and factors affecting this process are presented. Particular attention is paid to flocculants based on starch, cellulose, chitosan, and their derivatives because they are low-cost and ecological materials, accepted in industrial practice. New trends in water treatment technology, including biosynthetic polymers, nanobioflocculants, and stimulant-responsive flocculants are also considered.

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Section: Bio-based Polysaccharide Flocculants For Water Treatmentmentioning

confidence: 99%

Recent Achievements in Polymer Bio-Based Flocculants for Water Treatment

2020

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“…It has been identified that the MO seed extract contain cationic protein of polymerization which help in the low cost clarification procedures, has been widely used in the rural community areas to clear the cloudy water (Debora et al 2013;Marañón et al 2010). Another example, a natural polyelectrolyte of chitosan also has drawn much attention due to its high molecular weight and charged density along with its biodegradable polymer origin (Mohammadi et al 2014;Pontius 2016;Zonoozi et al 2011). Chitosan that is derived from deacetylation of chitin, are extensively found on natural sources and marine creatures such as arthropods, insects, crustaceans and fungi (Chi & Cheng 2006;Vieira et al 2012;Zonoozi et al 2011) while being the second most abundant biopolymer on Earth after cellulose (Jadhav & Mahajan 2013).…”

Section: Chemical and Natural Coagulantsmentioning

confidence: 99%

A Review of Wastewater Treatment using Natural Material and Its Potential as Aid and Composite Coagulant

Salleh¹,

Mohd-Zin²,

Othman³

2019

JSM

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The introduction of natural materials into the coagulation-flocculation process need to be practiced as common as possible. The previous literature indicated that utilization of natural material is actually worth to be developed and if possible, into the commercial one. However, the application of natural coagulants itself as the primary treatment is not sufficient, due to the rise in constraints which limited its performance. Emerging technologies and depth studies are actually helping these limited conditions to grow them as good as the performance of chemical coagulants. Alternatively, the natural-based coagulants are commonly used as coagulant aids alongside chemical coagulants, which have created a highlight in water research. This review covers the type of coagulants used in the coagulation-flocculation of wastewater treatment especially in the usage of natural-based coagulants. This review paper also outlines the future prospects of natural materials as aids and its potential as sustainable composite coagulants.

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“…Among them includes limited availability in certain regions; it is not biodegradable; large chemical doses are necessary for the treatment of eutrophic waters, and a massive amount of chemical sludge is produced. 79,98,[112][113][114] Also, its residues cause harmful effects for both animal species [115][116][117] and public health. 115,[118][119][120][121] Hereupon, the total or partial replacement of the traditionally used compounds, with natural and biodegradable natural substances, is a solution that is being much discussed in the literature.…”

Section: Introductionmentioning

confidence: 99%

Use of Natural Coagulants/Flocculants in the Treatment of Hospital Laundry Effluents

Abreu¹,

Montel²,

Scapin³

2020

Preprint

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<p>Water is a fundamental substance for the existence of life on earth. However, globally there is a freshwater crisis. Hospitals generate exorbitant volumes of effluents (5 to 15 times more toxic than urban ones). Hospital laundry is known for demanding the highest volumes of water, generating a proportional amount of complex effluents with high toxicity and recalcitrance. Adequate treatment for hospital wastewater is always an essential solution. Among all treatment methods, coagulation/flocculation emerges as one of the best alternatives. However, the use of traditional compounds such as aluminium sulfate has caused secondary pollution; its residues are harmful to public and environmental health. In this sense, the present study used natural compounds that do not cause adverse effects, such as chitosan/hydroxyapatite, to clarify the laundry effluents of the largest hospital from the Tocantins. The results showed that the hydroxyapatite associated with chitosan, at pH 6 and dosage of 50 mg/L, reduced the turbidity and apparent colour of these wastewaters by up to 67 and 55%, respectively. With lower performance and higher dosage (60 mg/L), the chitosan gel used (pH 6) promoted a maximum reduction of 35% of the apparent colour and 40% of turbidity.<br></p>

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Chitosan as a Drinking Water Treatment Coagulant

Cited by 38 publications

References 9 publications

Recent Achievements in Polymer Bio-Based Flocculants for Water Treatment

Recent Achievements in Polymer Bio-Based Flocculants for Water Treatment

A Review of Wastewater Treatment using Natural Material and Its Potential as Aid and Composite Coagulant

Use of Natural Coagulants/Flocculants in the Treatment of Hospital Laundry Effluents

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