Combined organic coagulants and photocatalytic processes for winery wastewater treatment

Jorge, Nuno; Teixeira, Ana R.; Lucas, Marco S.; Peres, José A.

doi:10.1016/j.jenvman.2022.116819

Cited by 18 publications

(14 citation statements)

References 54 publications

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“…Due to the fact that the colloidal matter present in the effluent has a negative charge, it will be attracted by the protons, originating a neutral molecule that will then flocculate and agglomerate into settleable flocs [10,19,44]. The suitable results obtained with increasing dosage can be justified by the existence of water-soluble dimeric proteins in the constitution of the CSs and CPs (noticed in FTIR analysis), which plays a role as natural polyelectrolytes with a mechanism that associates adsorption (porous structure proved by SEM images), charge neutralization, particle bridging of destabilized particles, enmeshment, and precipitation [46]. On the other hand, for TPh and DOC parameters (Figure 4c,d), it was verified that the removal values decreased with the increase in the amount of coagulant.…”

Section: Coagulant Dosage Effectmentioning

confidence: 99%

“…In the CFD process, two stages are performed: fast and slow mix. Fast agitation disperses the coagulant throughout the wastewater to promote the destabilization of the colloidal particles (coagulation process), while slow agitation is required to promote the aggregation into flocs, getting larger and settling (flocculation process) [40,44,46,48].…”

Section: Agitation Effectmentioning

confidence: 99%

“…This section studies the influence of the stirring process on the reduction in turbidity, TSS, TPh, and DOC from the OMW, through the variation in the mixing conditions, according to Jorge et al [46]: (1) 120 rpm/1 min-20 rpm/30 min, (2) 150 rpm/2 min-50 rpm/30 min, (3) 150 rpm/3 min-20 rpm/20 min, (4) 180 rpm/3 min-40 rpm/17 min, and (5) 200 rpm/2 min-60 rpm/30 min, respectively, fast mix and slow mix. The results obtained (Figure 5) showed that PBC and iron sulfate were influenced by mixing conditions.…”

Section: Agitation Effectmentioning

confidence: 99%

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Valorization of Cherry By-Products as Coagulant/Flocculants Combined with Bentonite Clay for Olive Mill Wastewater Treatment

Teixeira,

Afonso,

Jorge

et al. 2024

Water

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In this study, two by-products resulting from the processing of cherry (stems and pits) were used as natural coagulants to promote the valorization of these wastes and treat olive mill wastewater (OMW). The efficacy of the plant-based coagulants (PBCs) in the coagulation–flocculation–decantation process (CFD) was evaluated through the removal of turbidity, total suspended solids (TSS), total polyphenols (TPh), and dissolved organic carbon (DOC). The CFD process was demonstrated to be effective in turbidity and TSS reduction in OMW. Using cherry stems (CSs), these reductions were 65.2% of turbidity and 58.0% of TSS, while cherry pits (CPs) achieved higher reductions, 78.6% of turbidity and 68.2% of TSS. To improve the effectiveness of OMW treatment, mainly regarding the removal of TPh and DOC, the CFD process was complemented with the adsorption process (using bentonite clay). The adsorption capacity of bentonite was higher in acidic conditions (pH 3.0) and, with a dosage of 3.0 g L−1, reached 17.3 mg of DOC and 13.8 mg of TPh per gram of bentonite. Several adsorption isothermal models were assessed, and the Langmuir (r2 = 0.985), SIPS (r2 = 0.992), and Jovanovic models (r2 = 0.994) provided the best fittings. According to the optimal operational conditions defined throughout the present work, the combination of CFD and adsorption removals were as follows: (1) 98.0 and 91.3% of turbidity, (2) 80.8 and 81.2% of TSS, (3) 98.1 and 97.6% of TPh and (4) 57.9 and 62.2% of DOC, for CSs and CPs, correspondingly. Overall, the results suggest that cherry by-products can be used as low-cost natural coagulants and, when combined with another natural, abundant, and cheap material, such as bentonite clay, can be a sustainable alternative for treating OMW.

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Section: Coagulant Dosage Effectmentioning

confidence: 99%

Section: Agitation Effectmentioning

confidence: 99%

Section: Agitation Effectmentioning

confidence: 99%

See 1 more Smart Citation

Valorization of Cherry By-Products as Coagulant/Flocculants Combined with Bentonite Clay for Olive Mill Wastewater Treatment

Teixeira,

Afonso,

Jorge

et al. 2024

Water

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“…Due to the reaction of Fe 2+ with H 2 O 2 , the Fe 2+ was oxidized to Fe 3+ , precipitating and ferric hydroxide. The UV-A was able to regenerate the Fe 3+ to Fe 2+ (Equation ( 5)) [35,36], thus a higher HO • radicals generation occurred.…”

Section: Chemical Degradability Of Caffeic Acidmentioning

confidence: 99%

Degradation of Agro-Industrial Wastewater Model Compound by UV-A-Fenton Process: Batch vs. Continuous Mode

Jorge

Teixeira

Fernandes

et al. 2023

IJERPH

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The degradation of a model agro-industrial wastewater phenolic compound (caffeic acid, CA) by a UV-A-Fenton system was investigated in this work. Experiments were carried out in order to compare batch and continuous mode. Initially, batch experiments showed that UV-A-Fenton at pH 3.0 (pH of CA solution) achieved a higher generation of , leading to high CA degradation (>99.5%). The influence of different operational conditions, such as H2O2 and Fe2+ concentrations, were evaluated. The results fit a pseudo first-order (PFO) kinetic model, and a high kinetic rate of CA removal was observed, with a [CA] = 5.5 × 10−4 mol/L, [H2O2] = 22 × 10−4 mol/L and [Fe2+] = 1.1 × 10−4 mol/L (kCA = 0.694 min−1), with an electric energy per order () of 7.23 kWh m−3 order−1. Under the same operational conditions, experiments in continuous mode were performed under different flow rates. The results showed that CA achieved a steady state with higher space-times (θ = 0.04) in comparison to dissolved organic carbon (DOC) removal (θ = 0–0.020). The results showed that by increasing the flow rate (F) from 1 to 4 mL min−1, the CA and DOC removal rate increased significantly (kCA = 0.468 min−1; kDOC = 0.00896 min−1). It is concluded that continuous modes are advantageous systems that can be adapted to wastewater treatment plants for the treatment of real agro-industrial wastewaters.

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“…, although lower than hydroxyl radical (E 0 HO • = 2.80 V) [7]. PS (colorless, white crystal), with high stability, is readily dissolved in water, solubility = 730 g L −1 [12], acidic water solution, symmetrical structure, O-O bond distance = 1.497 Å, bond energy = 140 kJ/mol [8,9] [14,15]. In a Web of Science search using keywords "sulfate radicals", "Fenton", and "industrial wastewater", results showed 212 articles published involving the treatment of IWW by sulfate radicals, against 1622 articles involving the treatment of IWW by Fenton, which shows a necessity to study sulfate radicals.…”

Section: Introductionmentioning

confidence: 99%

Sulfate Radical Advanced Oxidation Processes: Activation Methods and Application to Industrial Wastewater Treatment

Jorge,

Teixeira,

Gomes

et al. 2023

The 4th International Electronic Conference on Applied Sciences

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Combined organic coagulants and photocatalytic processes for winery wastewater treatment

Cited by 18 publications

References 54 publications

Valorization of Cherry By-Products as Coagulant/Flocculants Combined with Bentonite Clay for Olive Mill Wastewater Treatment

Valorization of Cherry By-Products as Coagulant/Flocculants Combined with Bentonite Clay for Olive Mill Wastewater Treatment

Degradation of Agro-Industrial Wastewater Model Compound by UV-A-Fenton Process: Batch vs. Continuous Mode

Sulfate Radical Advanced Oxidation Processes: Activation Methods and Application to Industrial Wastewater Treatment

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