Tannery wastewater treatment by electro-Fenton and electro-persulfate processes using graphite from used batteries as free-cost electrode materials

Doumbi, Romuald Teguia; Noumi, Guy Bertrand; Ngobtchok, Benguene; Domga,

doi:10.1016/j.cscee.2022.100190

Cited by 28 publications

(6 citation statements)

References 26 publications

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“…Large amounts of sodium sulfate and ammonium sulfate are used in the tanning, pickling, and deliming stages of leather processing [67]. The wastewater under study contained sulfate at 4850 ± 430 mg/L (Table 2), which is higher than that reported by other international studies [45,61,62].…”

Section: Physicochemical Parametersmentioning

confidence: 84%

“…The high quantities of boron found in this investigation (7.2 ± 1.5 mg/L, Table 2) are likely associated with the use of boric acid as a preservative for hides [57,58] and exceed the MAV by approximately 80%. Nitrogen is an important parameter that is regulated in part due to concerns about eutrophication pressures associated with release, and several authors report the values as ammoniacal nitrogen [45,54,[59][60][61][62][63][64][65]. In this study, 490 ± 10 mg total N/L was obtained using the persulfate method (Table 2), which is in between what was reported by Vo et al [45] in China and that from Villaseñor-Basulto et al [5] in Mexico, who obtained values of 350 and 850 mg N/L, respectively, for tannery wastewater using the same method applied in this study.…”

Section: Physicochemical Parametersmentioning

confidence: 99%

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Acute Ecotoxicity Potential of Untreated Tannery Wastewater Release in Arequipa, Southern Peru

Tejada-Meza,

Arenazas-Rodríguez,

Garcia-Chevesich

et al. 2023

Sustainability

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The centralized Rio Seco Industrial Park (RSIP) tannery collective in the Southern Peruvian city of Arequipa releases untreated tannery wastewater into a proximal creek that is a tributary of the Chili River. As industrial leather tanning wastewater contains high concentrations of metal(loid)s, salts, dyes, and organics, this complex mixture could exert a myriad of toxicological effects on the surrounding ecosystem. The RSIP effluent was analyzed to quantify the acute ecotoxicity and ecotoxicological status of this untreated industrial wastewater at multiple trophic levels with the following bioindicators: the floating macrophyte Lemna minor, invertebrates Daphnia magna and Physa venustula, and the amphibian Xenopus laevis. A physicochemical characterization of the RSIP effluent revealed a highly contaminated waste stream. In addition to chromium (10.4 ± 0.4 mg/L) and other toxic metals, the water harbored extremely high concentrations of total dissolved solids (67,770 ± 15,600 mg/L), biochemical oxygen demand (1530 ± 290 mg/L) and total nitrogen (490 ± 10 mg/L). The toxicological responses of certain bioindicator species tested were evaluated after exposure to 0, 1.5, 3.0, and 4.5% untreated tannery wastewater blended with dechlorinated tap water. L. minor experienced a significant decrease in the number of fronds, wet weight, and dry weight at the lowest blended wastewater of 1.5%. Bioassays with D. magna showed the effect on neonatal mortality with a calculated LC50 of 1.1% for 48 h. Bioassays with P. venustula embryos showed high sensitivity to diluted effluent with complete mortality at 3.0% wastewater and above. Finally, X. laevis showed a high sensitivity to the dilutions with an LC50 of 1.6 for embryos and 1.8% for tadpoles. Although RSIP wastewater contains many potentially toxic components, chromium and total dissolved solids, with a major contribution from sodium, are best correlated with acute toxicity variables. This suggests that conductivity or analogous measurements could provide a rapid and affordable forensic tool to query acute ecosystem pressures. Collectively, the results indicate that the release of untreated tannery wastewater from RSIP can exert pronounced acute impacts across trophic levels with the need for treatment or dilution to below 1% of total flow. As the assays addressed acute toxicity, the necessary treatment and/or dilution to mitigate chronic effects is likely much lower. In conclusion, untreated RSIP tannery wastewaters represent an ecological risk to downstream aquatic ecosystems; this needs to be addressed to prevent current and future environmental consequences.

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Section: Physicochemical Parametersmentioning

confidence: 84%

Section: Physicochemical Parametersmentioning

confidence: 99%

Acute Ecotoxicity Potential of Untreated Tannery Wastewater Release in Arequipa, Southern Peru

Tejada-Meza,

Arenazas-Rodríguez,

Garcia-Chevesich

et al. 2023

Sustainability

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“…The effluents generated by this segment are among the most polluting and have high chemical complexity in their composition. The characteristics of tannery effluents vary greatly and depend on the characteristics of the used wash process, containing many chemicals, such as sodium and ammonium salts, lime, fat, tannins, dyes, proteins, chlorides, sulfates, sulfides and trivalent chromium, all of which are harmful to human, animal and plant health. , The processes employed in the treatment of hides and skins involve complex combinations of mechanical and chemical operations. Therefore, they may also contain oils, animal tissue remnants, emulsifying agents, dyes, organic tannins, animal hair, and other pollutants, which are responsible for high BOD (Biochemical Oxygen Demand) and COD values. − …”

Section: Applications Of the Ec Processmentioning

confidence: 99%

Electrocoagulation Process as a Consolidated Technology in the Treatment of Industrial Effluents and as a Promising Process in the Treatment of Effluents Generated by Car Washes: A Brief Review

Guerreiro Crizel,

Barreto,

Fiori

et al. 2024

ACS EST Water

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Electrocoagulation (EC) is an efficient treatment method that involves the electrodissolution of anodes, the formation of coagulants in situ, and the production of hydrogen at the cathode, facilitating the removal of pollutants by flotation. Industry in general aims to reduce the contaminant load, expressed as chemical oxygen demand (COD), and EC effluent treatment is particularly effective in this process. The development of EC processes has been an efficient alternative for the treatment of effluents with high pollutant loads, such as tannery, pulp and paper, textile, beverage, and food industries, and many demonstrate the potential for application in car wash effluent. This study presents a review of the use of EC for the treatment of various effluents containing COD, OGs, surfactants, color, and turbidity, but with a greater focus on the vehicle washing sector. It also discusses the factors that influence the efficiency of EC and the main discussions of the authors. Presently, the investigations of studies already carried out show that the performance of the EC process is dependent on many relationships and factors, such as the type of material constituting the electrode, the electric potential difference, the electric current density, the distance between electrodes, the surface area of the electrodes, the pH, the initial concentration of contaminants, the conductivity and the treatment time. The review demonstrated that the EC process has been employed in the treatment of many types of effluents and with relatively high efficiency rates, in general, between 60.0% and up to 90.0%, aiming at the reduction of the COD indexes, the reduction from 60.0% up to 99.0% of color content, the 87.0% reduction of chromium. In turn, for turbidity, it varied on average from 44.0 to 99.0%. For other parameters such as MBAS and OGs, in most studies, the reduction exceeded 90.0%.

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“…For the purpose of characterizing COD, samples were subjected to the recognized colorimetric approach via Lovibond water testing, Photometer-System MD200. Equation ( 2) provides an estimate of the energy consumption (EC) in (kWh/kg COD) [Doumbi et al, 2022].…”

Section: Phenol Removalmentioning

confidence: 99%

Synthesis of Mn-Co-Ni Composite Electrode by Anodic and Cathodic Electrodeposition for Indirect Electro-oxidation of Phenol – Optimization of the Removal by Response Surface Methodology

Ahmed,

Salman

2023

Ecol. Eng. Environ. Technol.

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In the present work, Response Surface Methodology (RSM) was utilized to optimize process variables and find the best circumstances for indirect electrochemical oxidation of mimicked wastewater to remove phenol contaminants using prepared ternary composite electrode. The electrodeposition process is used for the synthesis of a ternary composite electrode of Mn, Co, and Ni oxides. The selected concentrations of metal salts of these elements were 0.05, 0.1, and 1.5 M, with constant molar ratio, current density, and electrolysis time of 1:1:1, 25 mA/cm 2 , and 2 h. Interestedly, the gathered Mn-Co-Ni oxides were deposited at both the anode and cathode. X-ray diffraction (XRD) and scanning electron microscopy (SEM) facilitated the qualitative characterization of surface structure and morphology of the accumulated oxides. The energy dispersive X-ray (EDX) provided a semi-quantitative analysis of deposit composition. The atomic force microscopy (AFM) apparatus quantified t he roughness. We examined the efficiency of composite electrodes in coinciding with the removal of Chemical Oxygen Demand (COD) under current densities of 40, 60, and 80 mA/cm 2 , pH values of 3, 4, and 5, and NaCl concentrations of 1, 1.5, 2 g/l. RSM covered the optimization of process parameters in conjunction with Central Composite Design (CCD). The COD represented the response function in the optimization procedure. The optimal current density, NaCl concentration, and pH magnitude were 80 mA/cm 2 , 1.717 g/l, and 3, respectively. The efficiency of COD elimination of 99.925% attained after 1 hour of indirect electrochemical oxidation with an energy consumption of 152.380 kWh per kilogram of COD. The COD elimination model is significant based on the correlation coefficient (R 2 ) and F-values, and the experimental data fitted well to a second-order polynomial model with R 2 of 98.93%.

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Tannery wastewater treatment by electro-Fenton and electro-persulfate processes using graphite from used batteries as free-cost electrode materials

Cited by 28 publications

References 26 publications

Acute Ecotoxicity Potential of Untreated Tannery Wastewater Release in Arequipa, Southern Peru

Acute Ecotoxicity Potential of Untreated Tannery Wastewater Release in Arequipa, Southern Peru

Electrocoagulation Process as a Consolidated Technology in the Treatment of Industrial Effluents and as a Promising Process in the Treatment of Effluents Generated by Car Washes: A Brief Review

Synthesis of Mn-Co-Ni Composite Electrode by Anodic and Cathodic Electrodeposition for Indirect Electro-oxidation of Phenol – Optimization of the Removal by Response Surface Methodology

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