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<p>The potential use of olive mill wastewater (OMW) in citric acid production was investigated after optimization of activated carbon treatment steps performed after overliming. For recuding phenolic compounds; temperature, amount of activated carbon, contact time and shaking rate were selected as independent variables. By using response surface methodology, variation of total phenolic compound amount with the independent variables was defined by quadratic model. According to variance analysis, the linear effects of amount of activated carbon and temperature and also the quadratic effect of the amount of activated carbon on the response were found as very important. By numeric optimization; 42.01&#xa0;°C temperature, 6.99&#xa0;g/100&#xa0;mL amount of activated carbon, 128.55&#xa0;min contact time and 193.99&#xa0;rpm shaking rate were determined as optimum conditions. 97% phenolic compound and 50% COD reduction were achieved. Treated OMW was used in the production of citric acid by <i>Y. lipolytica</i> K-168 after supplementation with some nutrients. Maximum citric acid concentrations were obtained as 42.54&#xa0;g/L, 29.34&#xa0;g/L and 20.41&#xa0;g/L in the media containing glycerol, glucose and waste oil, respectively. Although the best results were obtained in glycerol-containing OMW, waste oil was introduced as a promising low-cost carbon source for citric acid production.</p>

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Optimization of adsorption of phenolic compounds from olive mill wastewater for evaluation in citric acid production

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Busra Arici,
  • Seda Karasu-Yalcin,
  • Kubra Eryasar-Orer

摘要

The potential use of olive mill wastewater (OMW) in citric acid production was investigated after optimization of activated carbon treatment steps performed after overliming. For recuding phenolic compounds; temperature, amount of activated carbon, contact time and shaking rate were selected as independent variables. By using response surface methodology, variation of total phenolic compound amount with the independent variables was defined by quadratic model. According to variance analysis, the linear effects of amount of activated carbon and temperature and also the quadratic effect of the amount of activated carbon on the response were found as very important. By numeric optimization; 42.01 °C temperature, 6.99 g/100 mL amount of activated carbon, 128.55 min contact time and 193.99 rpm shaking rate were determined as optimum conditions. 97% phenolic compound and 50% COD reduction were achieved. Treated OMW was used in the production of citric acid by Y. lipolytica K-168 after supplementation with some nutrients. Maximum citric acid concentrations were obtained as 42.54 g/L, 29.34 g/L and 20.41 g/L in the media containing glycerol, glucose and waste oil, respectively. Although the best results were obtained in glycerol-containing OMW, waste oil was introduced as a promising low-cost carbon source for citric acid production.