Pretreatment of industrial wastewater by natural flotation: application to pollution reduction from vegetable oil refinery wastewaters

Kastali, Malika; Mouhir, Latifa; Saafadi, Laila; Yılmaz, Levent; Souabi, Salah

doi:10.1007/s11356-021-12850-9

Cited by 11 publications

(7 citation statements)

References 32 publications

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“…In addition, basic wastewater has variable biodegradability over time. These results agree with Chatoui et al (2016) [17], and Kastali et al (2021) [19] showed that wastewater composition from the same effluent could vary considerably daily and attribute. This fluctuation is attributed to the different types of oils processed and the operating conditions and processes at the company level.…”

Section: Evolution Of the Biodegradability Of Organic Mattersupporting

confidence: 91%

“…It should be noted that the pH, the pollutant load and the flow rate for many industrial discharges vary over time, as shown by Chatoui et al (2017) [17]. In addition, [19] also pointed out that the pH for process and leg-breaking wastewater have pH values of basic and acid. The results of the study on vegetable oil wastewater by Anyanwu et al (2019) [12] showed that the pH ranged from 0.7 to 1.23.…”

Section: Physico-chemical Characterization Of Process Wastewater Acid...mentioning

confidence: 95%

“…Indeed, vegetable oil refining industries are ranked as one of the primary sources of environmental pollutants [16]. For example, the vegetable oil refinery uses various physical and chemical processes to provide quality oil while discharging significant amounts of wastewater [17][18][19]. In addition, the wastewater streams from the vegetable oil refinery without any prior treatment create environmental problems, such as a threat to aquatic life due to their high organic matter content [12,17,19].…”

Section: Introductionmentioning

confidence: 99%

“…For example, the vegetable oil refinery uses various physical and chemical processes to provide quality oil while discharging significant amounts of wastewater [17][18][19]. In addition, the wastewater streams from the vegetable oil refinery without any prior treatment create environmental problems, such as a threat to aquatic life due to their high organic matter content [12,17,19]. Indeed, the direct discharge of this wastewater causes aquatic organisms' toxicity and photosynthetic activity deterioration [20][21], electrocoagulation [22],…”

Section: Introductionmentioning

confidence: 99%

“…The effluents are rich in COD, oils and fats, sulfates, and phosphates, which leads to a significant pollutant load, both inorganic and organic. Indeed, these liquid discharges pose a significant challenge in the vegetable oil processing industry [7,19]. As a result, studies on the treatment of oily wastewater based primarily on the diagnosis of wastewater have become increasingly important.…”

Section: Introductionmentioning

confidence: 99%

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Study of the Pollution Generated by Wastewater from the Refining of Vegetable Oils

Abdelkader¹,

Malika²,

Mouhir³

et al. 2022

Int. J. Membrane Sci. Techno.

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This study concerns the assessment of the pollution generated by three industrial discharges produced by the Lesieur company in Ain Harrouda for the production of vegetable oils, such as process water (PWW), ACID wastewater (AWW), and refining wastewater. (RWW). This wastewater is heavily loaded with pollutants that could pose serious environmental problems. The concentrations of polluting matter in chemical oxygen demand (COD), Biological Oxygen Demand (BOD), and Total suspended solids (TSS), variable in time, could strongly influence the effectiveness of treatment with sludge currently used by Lesieur. In addition, process wastewater and refining wastewater are loaded with fats and oils with varied concentration between3700 and 6000 mg/l. At the same time, wastewater from leg breaking has a concentration varying between 1000 and 6000 mg/L. Additionally, leg-breaking water has a concentration of Total suspended solids (TSS) varying between 10,000 mg/L and 23,000 mg/L. In comparison, process wastewater and refining water have concentrations (TSS) ranging between 4500 mg/L and 8000 mg/L, related to turbidity exceeding 10000 NTU. Furthermore, COD fluctuates between 700 and 3,400 mg/L and suspended matter between 500 and 8,000 mg/L with average pollution loads of 114 and 358 kg/day, respectively. Indeed, the COD/BOD5 ratio for process wastewater varies between 3 and 7. On the other hand, for basic wastewater, this ratio varies between 3 and 20, which could be due to the quality of wastewater with high polyphenol content. Indeed, refining wastewater has a COD/BOD5 ratio that varies between 2 and 4, which shows that organic matter is biodegradable compared to other types of wastewater. The phenol concentration varies over time and goes from 20 to 125 mg/L, while the surfactants have a variable concentration of 20 and 127 mg/L over time, then increases during the summer, taking into account the increase in market demand.

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Section: Evolution Of the Biodegradability Of Organic Mattersupporting

confidence: 91%

Section: Physico-chemical Characterization Of Process Wastewater Acid...mentioning

confidence: 95%