Enhanced efficiency of dissolved air flotation for biodiesel wastewater treatment by acidification and coagulation processes

Rattanapan, Cheerawit; Sawain, Aneak; Suksaroj, Thunwadee Tachapattaworakul; Suksaroj, Chaisri

doi:10.1016/j.desal.2011.07.018

Cited by 116 publications

(72 citation statements)

References 24 publications

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“…In addition to the structural-mechanical factor and the electrostatic factor of aggregation stability, these chemical characteristics of the cellulose acetate sulfate allowed to recommend them for effective preparations for the contaminated water purification. In the literature there are many studies regarding the biodiesel wastewater treatment by coagulation-flocculation [9], adsorption [36], flotation by dissolved air [37], electro-coagulation [38,39], electro-oxidation [40]. However, there are no reports of biodiesel wastewaters treatment by flocculation using only natural flocculants.…”

Section: Introductionmentioning

confidence: 99%

Polymeric polyelectrolytes obtained from renewable sources for biodiesel wastewater treatment by dual-flocculation

Ribeiro¹,

Filho²,

Rozeno³

et al. 2017

Express Polym. Lett.

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Abstract. Biodiesel wastewater generally contains high levels of oils, soaps and glycerol residues. This needs wastewater treatment. In this study, the biodiesel wastewater treatment was tested (industrial wastewater (EFID) and laboratory wastewater (EFLB) from biodiesel) by performing flocculation and dual-flocculation with renewable polymers. Tannin and cationic hemicellulose (CH) were used as cationic flocculant, and cellulose acetate sulfate (CAS) was used as an anionic flocculant. Polyacrylamide (PAM) was used as a reference anionic flocculant for result efficiencies analysis obtained with CAS (renewable source flocculant). The treatment efficacy in wastewater was evaluated by: turbidity removal, sludge volume formed, chemical oxygen demand (COD) and total suspended solids (TSS). The obtained sludge was studied using thermogravimetric analysis (TG). The dual-flocculation application condition of the 25% proportion of tannin (T) and 75% proportion of cationic hemicelluloses (i.e., T25/CH75) showed EFLB turbidity removal of 89.1% and 89.5% for CAS and PAM additions respectively, and for EFID of 67% and 41% for CAS and PAM additions respectively. The dual-flocculation performance suggested that the polyelectrolytes obtained from renewable sources can be used for treating biodiesel wastewater.

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Section: Introductionmentioning

confidence: 99%

Polymeric polyelectrolytes obtained from renewable sources for biodiesel wastewater treatment by dual-flocculation

Ribeiro¹,

Filho²,

Rozeno³

et al. 2017

Express Polym. Lett.

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“…Crude glycerol has been gasified along with olive kernel, hardwood chips, physic nut waste, and palm shell waste (Sricharoenchaikul and Atong 2012;Wei et al 2011;Rattanapan et al 2011;Skoulou and Zabaniotou 2013). The co-gasification of crude glycerol and biomass incremented Syngas yield, heating value, and H 2 concentration (Sricharoenchaikul and Atong 2012;Wei et al 2011;Rattanapan et al 2011;Skoulou and Zabaniotou 2013). The Syngas produced from the crude glycerol co-gasification can be further employed to generate electricity or to produce chemicals or biofuels (Skoulou and Zabaniotou 2013).…”

Section: Renewable Energy Productionmentioning

confidence: 99%

“…The projected production of biodiesel for 2016 is 37 billion gallons, this amount of biodiesel will produce 43 billion gallons of wastewaters Siles et al 2011). This large amount of residues is related with disposal and environmental issues, because these wastewaters have a high organic load that does not allow its direct disposal into the sewage system (Rattanapan et al 2011). Solid by-products are the residues that include pressed seed cakes, spent earth, and agricultural wastes.…”

Section: Introductionmentioning

confidence: 99%

Conversion of residues and by-products from the biodiesel industry into value-added products

Plácido

Capareda

2016

Bioresour. Bioprocess.

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Biodiesel, one of the most important sources of renewable energy, is produced in large quantities around the world; however, its production generates different kinds of residues and by-products which raise economic and environmental concerns. This review presents a compilation of the data on current state of transformation of residues and by-products of biodiesel industry into products that are suitable for bio-refining. The review has analyzed glycerol, biodiesel washing wastewaters, and solid residues. The technologies were described and the most significant experimental results and variables were summarized to allow researchers an easy access to this information.

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“…4 Since biodiesel wastewaters contain soaps (presence of polar anionic and nonionic groups), oils and fats (presence of carboxylic groups), the cycle of emulsificationdemulsification tends to be strongly pH dependent. Low pH values favor the demulsification through the reduction of the electrical forces or by the commitment of the electrical double-layer, 7 with the opposite effect at pH values above 7. In this context, the acidification of the effluent is important to reduce the electrical repulsion between carboxylic and other anionic groups.…”

Section: Introductionmentioning

confidence: 99%

Biodiesel Wastewater Treatment by Coagulation-Flocculation: Evaluation and Optimization of Operational Parameters

Gonçalves¹,

Neto²,

Machado³

et al. 2016

J. Braz. Chem. Soc.

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In this study the coagulation-flocculation process was evaluated as an alternative for treatment of biodiesel wastewater. The role of two coagulants, Al 3+ and Fe 3+ , as well as its dosage, pH, treatment time, stirring and aeration were evaluated. It was observed that in the treatment using Al 3+ the pH of the effluent (9.7) does not need to be adjusted, while for Fe 3+ a previous adjustment to pH 5.0 was necessary. On the other hand, a high concentration of Al 3+ (243 mg L -1) and a relatively long treatment time (70 min) were required to reach more than 96% of turbidity removal, when compared to the processing using Fe 3+ (56 mg L -1 and 53 min), attributed to the formation of different mole fractions of hydrolyzed cationic species. Under the optimized conditions, more than 96% of turbidity, apparent color and suspended solids, and 82% of oil and fats were removed. Keywords: aluminum sulfate, biodiesel effluent, ferric chloride, physical-chemical treatment, turbidity IntroductionThe quality of the biodiesel is directly dependent on its refinement process, which produces large volumes of wastewater inappropriate for disposal in water bodies. [1][2][3][4] In general, biodiesel wastewater is characterized by expressive values of chemical oxygen demand (COD) and biochemical oxygen demand (BOD 5 ), respectively between 9,500 and 230,000 mg L -1 and 1,650 and 3,200 mg L -1 , due the presence of glycerin, alcohols (methanol and/ or ethanol), oil, fats and other contaminants; 5 turbidity between 189 and 2,550 NTU; oils and fats between 124 and 7,200 mg L -1 ; color between 361 and 1,500 mg Pt-Co L -1 ; total solids between 3.7 and 25 g L -1 ; residual methanol between 8 and 29% (m/m) and residual glycerin between 0.6 and 1.6 (m/m). 3,4 In terms of oils and fats, the Brazilian legislation establishes as 50 mg L -1 the maximum disposal limit for wastewaters derived from the production of biodiesel.6 So, it is extremely important the study and proposition alternative processes for the efficient treatment of this kind of wastewater. This is a research field relatively new, once the first studies on biodiesel wastewater treatment started on 2005. 4 Three reviews on biodiesel wastewater treatment have been recently published. 1,4,5 One of them summarizes a significant number of possible processes and discusses their advantages and disadvantages as well as the possibilities of application for the improvement of the treatment of biodiesel wastewaters. The improvement of the operational parameters of the coagulation-flocculation process, based on the coupling of acidification and coagulation, has been pointed as promisor for this purpose. 4 Since biodiesel wastewaters contain soaps (presence of polar anionic and nonionic groups), oils and fats (presence of carboxylic groups), the cycle of emulsificationdemulsification tends to be strongly pH dependent. Low pH values favor the demulsification through the reduction of the electrical forces or by the commitment of the electrical double-layer, 7 with the opposite effect at...

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Enhanced efficiency of dissolved air flotation for biodiesel wastewater treatment by acidification and coagulation processes

Cited by 116 publications

References 24 publications

Polymeric polyelectrolytes obtained from renewable sources for biodiesel wastewater treatment by dual-flocculation

Polymeric polyelectrolytes obtained from renewable sources for biodiesel wastewater treatment by dual-flocculation

Conversion of residues and by-products from the biodiesel industry into value-added products

Biodiesel Wastewater Treatment by Coagulation-Flocculation: Evaluation and Optimization of Operational Parameters

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