Flocculation behaviour of model textile wastewater treated with a food grade polysaccharide

Mishra, Anuradha; Bajpai, Malvika

doi:10.1016/j.jhazmat.2004.11.003

Cited by 138 publications

(68 citation statements)

References 17 publications

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“…However, after the optimum dosage, further increase in dosage caused the aggregated particles to respread and would also disturb particle settling (Bouatay and Mhenni 2014). These conclusions agree with that reported by Mishra and Malvika (2005) on the flocculation of model textile wastewater with a food-grade polysaccharide. Above the optimum dosage of 8 g/L, the trends showed a decrease in percentage removal attributed to particle stabilization due to some steric repulsion (Tripathy and De 2006).…”

Section: Effect Of Ofip Dosage and Ionic Strength On The Flocculationsupporting

confidence: 93%

“…Progressive occupation of these negatively charged sites after 180 min, at fixed OFIP dosage, resulted in total available binding sites being limited; hence, the coagulation-flocculation process attained equilibrium (Karthika et al 2010). A similar trend was observed for the removal of dyes from model textile wastewater using Plantago psyllium mucilage (Mishra and Malvika 2005). Figure 6 shows that as temperature increased, the percentage removal of Pb(II) also increased and peaked at 35°C, producing a characteristic curve for the effect of temperature on enzyme activity.…”

Section: Effect Of Contact Time and Temperaturesupporting

confidence: 71%

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Exploring the use of cactus Opuntia ficus indica in the biocoagulation–flocculation of Pb(II) ions from wastewaters

Nharingo

Zivurawa

Guyo

2015

Int. J. Environ. Sci. Technol.

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Coagulation-flocculation processes play an important role in the treatment of water using inorganic and synthetic materials. Presently, cactus Opuntia ficus indica is explored as a cheap, abundant and eco-friendly bioflocculant of Pb(II) ions from aqueous solutions. The cactus powder was characterized by Fourier transform infrared spectrometer (FTIR), and the coagulation-flocculation process was optimized for pH, initial concentration of Pb(II) ions, particle size, dosage, ionic strength, contact time and temperature before its application to Mukuvisi River water. FTIR confirmed the involvement of -C-O-C-, -OH, -C=O, -N-H and -C-H groups of the polysaccharides, carboxylic acids and amino acids in the removal of Pb(II) ions. The variation of percentage removal and zeta potential with pH and flocculant dosage suggested the involvement of adsorption-charge neutralization and adsorption-bridging mechanisms in the coagulationflocculation process. The process was optimum at pH 5, natural ionic strength, dosage of 8 mg/L, corresponding to zero zeta potential, with particle size \75 lm, at 35°C for a floc settling time of 180 min. The coagulation-flocculation process was spontaneous and endothermic with a positive change in entropy of the system. Total heavy metal removal of 100 % (Pb), 85.74 % (Zn), 84.16 % (Cd) and 93.02 % (Cu) were achieved, under optimum conditions, when Opuntia ficus indica powder was used to remove metals from water sampled from Mukuvisi River, Harare, Zimbabwe. The cactus Opuntia ficus indica powder was found to be an efficient, eco-friendly flocculant that can effectively remediate Pb(II) ions from wastewaters.

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Section: Effect Of Ofip Dosage and Ionic Strength On The Flocculationsupporting

confidence: 93%

Section: Effect Of Contact Time and Temperaturesupporting

confidence: 71%

Exploring the use of cactus Opuntia ficus indica in the biocoagulation–flocculation of Pb(II) ions from wastewaters

Nharingo

Zivurawa

Guyo

2015

Int. J. Environ. Sci. Technol.

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“…Plant-based bio-flocculants derived from some plant species (Hibiscus/Abelmoschus esculentus, Malva sylvestris, Plantago psyllium, Plantago ovata, Tamarindus indica, and Trigonella foenumgraecum) have shown promising results with respect to the treatment of biological effluent, landfill leachate, dye-containing wastewater, textile wastewater, tannery effluent, and sewage effluent. 1,3,4,28 Table 1 shows six different types of plants which have been investigated of their flocculating properties in the treatment of synthetic or genuine wastewater. It is discovered that all plants being studied for flocculants production have one similarity.…”

Section: Plant-based Bio-flocculantsmentioning

confidence: 99%

“…However, the investigation of active constituents that are corresponding with the flocculating ability is limited. There are two methods for the production of plant-derived bio-flocculants which have been reported thus far, which are (i) solvent extraction and precipitation 2,3,33,[36][37][38][39][40][41] and (ii) drying and grinding. 1,28 The detailed procedures for each method are illustrated in Figure 4.…”

Section: Plant-based Bio-flocculantsmentioning

confidence: 99%

A Review on Development and Application of Plant-Based Bioflocculants and Grafted Bioflocculants

Lee

Chong

Robinson

et al. 2014

Ind. Eng. Chem. Res.

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Flocculation is extensively employed for clarification through sedimentation. Application of ecofriendly plant-based bio-flocculants in wastewater treatment has attracted significant attention lately with high removal capability in terms of solids, turbidity, colour and dye. However, moderate flocculating property and short shelf life restrict their development. In order to enhance the flocculating ability, natural polysaccharides derived from plants are chemically modified by inclusion of synthetic, non-biodegradable monomers (e.g. acrylamide) onto their backbone to produce grafted bio-flocculants. This review is aimed to provide an overview of the development and flocculating efficiencies of plant-based bio-flocculants and grafted bio-flocculants for the first time. Furthermore, the processing methods, flocculation mechanism and the current challenges are discussed. All the reported studies about plant-derived bio-flocculants are conducted under lab-scale conditions in wastewater treatment. Hence, the possibility to apply natural bio-flocculants in food and beverage, mineral, paper and pulp, oleo-chemical and biodiesel industries is discussed and evaluated.

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“…Flocculation uses inorganic coagulants (FeSO4 and Al2(SO4)3) or organic polymers 2) to remove color, organic acids, and some metals in dye wastewater 3) . However, this treatment produces large amounts of sludge requiring disposal.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Titania Nanoparticles from Titanium Tetrachloride and Titanium Sulfate Flocculation of Dye Wastewater

Kim

Seol²,

Shon

et al. 2010

J. Jpn. Petrol. Inst.

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Flocculation behaviour of model textile wastewater treated with a food grade polysaccharide

Cited by 138 publications

References 17 publications

Exploring the use of cactus Opuntia ficus indica in the biocoagulation–flocculation of Pb(II) ions from wastewaters

Exploring the use of cactus Opuntia ficus indica in the biocoagulation–flocculation of Pb(II) ions from wastewaters

A Review on Development and Application of Plant-Based Bioflocculants and Grafted Bioflocculants

Preparation and Characterization of Titania Nanoparticles from Titanium Tetrachloride and Titanium Sulfate Flocculation of Dye Wastewater

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