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<p>Water is the important processing medium used in fruit juice industries. Thus, these sectors have a high demand for water and require appropriate techniques to recycle the wastewater. The exopolysaccharide (EPS) produced from <i>Bacillus licheniformis</i> ISLM newly isolated from an Algerian hot spring was extracted and characterized using FTIR, SEM and XRD analysis. The effectiveness of the EPS as a biocoagulant for treating fruit juice waste water using combined process of coagulation<b>-</b>flocculation and membrane filtration was evaluated for the first time by changing pH and EPS concentrations. FTIR study of EPS revealed the presence of many functional groups such as hydroxyl and carbonyl groups. EPS exhibited a sheet-like and amorphous structure according to SEM and XRD analysis. The optimum pH and concentration values for the biocoagulant were 10 and 25&#xa0;mg/L, respectively. The combined process of coagulation<b>-</b>flocculation and membrane filtration system attained final removal efficiencies of 43.7% for COD and 99.2% for turbidity, these results were superior to that shown by the chemical coagulants. The exopolysaccharide presented a high capacity for fruit juice wastewater treatment using this process. The results showed that produced EPS could be a candidate as an effective alternative to chemical coagulants in industrial wastewater treatment. Besides, the obtained results suggest promoting new environmental technology to improve wastewater treatment.</p>

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Combined process of coagulation-flocculation and membrane filtration for fruit juice wastewater treatment using exopolysaccharide from Bacillus licheniformis

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • K. Boumaza,
  • R. Marir,
  • Z. Bilici,
  • E. M. Bouchareb,
  • N. Dizge

摘要

Water is the important processing medium used in fruit juice industries. Thus, these sectors have a high demand for water and require appropriate techniques to recycle the wastewater. The exopolysaccharide (EPS) produced from Bacillus licheniformis ISLM newly isolated from an Algerian hot spring was extracted and characterized using FTIR, SEM and XRD analysis. The effectiveness of the EPS as a biocoagulant for treating fruit juice waste water using combined process of coagulation-flocculation and membrane filtration was evaluated for the first time by changing pH and EPS concentrations. FTIR study of EPS revealed the presence of many functional groups such as hydroxyl and carbonyl groups. EPS exhibited a sheet-like and amorphous structure according to SEM and XRD analysis. The optimum pH and concentration values for the biocoagulant were 10 and 25 mg/L, respectively. The combined process of coagulation-flocculation and membrane filtration system attained final removal efficiencies of 43.7% for COD and 99.2% for turbidity, these results were superior to that shown by the chemical coagulants. The exopolysaccharide presented a high capacity for fruit juice wastewater treatment using this process. The results showed that produced EPS could be a candidate as an effective alternative to chemical coagulants in industrial wastewater treatment. Besides, the obtained results suggest promoting new environmental technology to improve wastewater treatment.