Organic polyelectrolytes as the sole precipitation agent in municipal wastewater treatment

Cainglet, Annaliza; Tesfamariam, Axumawit; Heiderscheidt, Elisangela

doi:10.1016/j.jenvman.2020.111002

Cited by 31 publications

(10 citation statements)

References 29 publications

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“…To separate them from the aqueous phase, the dispersed particles must be combined into rapidly sedimenting aggregates by flocculation. Effective separation of solid particles in water downstream by water treatment plants is heavily reliant on flocculation with inorganic salts and synthetic polymers [1,2]. Flocculation as such is thereby reducing the amount of, e.g., inorganic particles and natural organic matter (NOM), by countering the surface charge of the suspended particles and therefore leading to aggregation of larger flocs and sedimentation of those.…”

Section: Introductionmentioning

confidence: 99%

“…Flocculation as such is thereby reducing the amount of, e.g., inorganic particles and natural organic matter (NOM), by countering the surface charge of the suspended particles and therefore leading to aggregation of larger flocs and sedimentation of those. Because of aluminum and iron salts having different drawbacks, such as small floc size, high salt consumption, and a high sludge volume, a transition to the use of polymeric flocculants in industrial applications can be seen [1][2][3]. Polyelectrolytes are used in wastewater treatment as flocculants to separate dispersed solids.…”

Section: Introductionmentioning

confidence: 99%

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A Comparative Study on the Flocculation of Silica and China Clay with Chitosan and Synthetic Polyelectrolytes

et al. 2021

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Flocculation is still one of the most important and efficient processes for water treatment. However, most industrial processes, such as in water treatment plants, still use huge amounts of synthetic polyelectrolytes for the flocculation process. Here we compare the flocculation of two different suspended particles, i.e., silica particles and china clay, with the biopolymer chitosan and two common strong synthetic polyelectrolytes. As a flocculant, chitosan featured a minimum uptake rate of 0.05 mg/g for silica and 1.8 mg/g for china clay. Polydiallyldimethylammonium chloride (PDADMAC) for comparison possessed a minimum uptake rate of 0.05 mg/g for silica and 2.2 mg/g for china clay. Chitosan as an environmentally friendly biopolymer competes with the synthetic polyelectrolytes and thus represents a beneficial economic alternative to synthetic flocculants.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Flocculation of Silica and China Clay with Chitosan and Synthetic Polyelectrolytes

et al. 2021

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“…There are multiple techniques to improve water quality when it is contaminated with Cr VI. Some of those are oxidation-reduction (Li et al 2017); phytoremediation (Rezania et al 2015); ion exchange (Fu and Wang;2011); precipitation (Cainglet et al 2020); capture by biopolymers (Gupta and Diwan. 2017); adsorption (Fu and Wang.…”

Section: Introductionmentioning

confidence: 99%

Remediation of contaminated water with Chromium VI by sorption in surface-activated-nanocellulose

Renata¹,

Bernardo²,

Patricia³

et al. 2021

Preprint

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Chromium VI is a frequent pollutant of industrial liquid effluents resulting from industrial waste. It is a substance classified into the carcinogen group I. In this study, a Cr VI sorption mechanism was developed by using nanocellulose beads (hydrogel) obtained from ivory nut. Cr VI was detected in water by a colorimetric method, using 1, 5-diphenylcarbazide at λ 540 nm. The sorption capacity of nanocellulose spheres was tested by varying the solution's pH and temperatures. Our results showed that nanocellulose can efficiently adsorb at pH 4 and 25°C. Removal percentages were between 91.29%(+/-1.36) and 95.33%(+/- 0.86) of the total Cr VI. The sorption kinetics showed that the material reaches equilibrium after 20–30 minutes. Additionally, an analysis of adsorption isotherms showed a high fit with the Langmuir and Freundlinch isotherms. Therefore, this method seem to be applied both to decontaminate industrial and drinking water employing an organic matrix such as nanocelullose beads.

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“…Various methods are used to treat effluents. Coagulation and flocculation, [76][77][78][79] ion exchange, 80,81 precipitation, 82 adsorption, 83,84 biological 85,86 and advanced oxidation [87][88][89] process are used to remove colloidal particles in the wastewater. 90,91 Among all treatment methods, the coagulation/flocculation (C/F) process is one of the oldest 92 and most essential treatment methods for most water and sewage treatment.…”

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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Organic polyelectrolytes as the sole precipitation agent in municipal wastewater treatment

Cited by 31 publications

References 29 publications

A Comparative Study on the Flocculation of Silica and China Clay with Chitosan and Synthetic Polyelectrolytes

A Comparative Study on the Flocculation of Silica and China Clay with Chitosan and Synthetic Polyelectrolytes

Remediation of contaminated water with Chromium VI by sorption in surface-activated-nanocellulose

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

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