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<p>Black liquor from wheat straw pulp contains high levels of lignin and silica, making it challenging to biodegrade using conventional methods. This study introduced electrocoagulation as a pretreatment step, generating a flocculating agent through the electro-oxidation of sacrificial anodes to remove pollutants via electrostatic attraction. Also, it aims to increase biological degradation under anaerobic conditions. The study optimized the electrocoagulation process using Response Surface Methodology (RSM), with pH (7–11), voltage (10–30&#xa0;V), and electrolysis time (10–60&#xa0;min) as operational parameters, and measured parameters including Chemical Oxygen Demand (COD), phenol, Total Solid (TS), Total Dissolved Solid (TDS), color, pH, and Specific Energy Consumption (SEC). The optimal conditions (pH 9, 20&#xa0;V, 35&#xa0;min) removed 49.40% COD, 43.61% phenol, 53.89% TS, 46.50% TDS, and 29.33% color, reducing black liquor alkalinity by 0.52 pH. Moreover, anaerobic digestion was conducted for 36&#xa0;days (digested sludge as an Inoculum) with untreated and pretreated black liquor (at concentrations of 10% and 30%), which showed an increment of 40% and 99.50% in biogas yield for the treated one, respectively. This research suggests electrocoagulation as a promising pretreatment method for enhancing the biological degradation of black liquor.</p> Graphical Abstract <p></p>

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Increasing Treatment Efficiency of Black Liquor from Wheat Straw Pulping Process through Electrocoagulation Followed by Anaerobic Digestion

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Aishwarya Gurung,
  • Bashu Gautam,
  • Bishnu Acharya

摘要

Black liquor from wheat straw pulp contains high levels of lignin and silica, making it challenging to biodegrade using conventional methods. This study introduced electrocoagulation as a pretreatment step, generating a flocculating agent through the electro-oxidation of sacrificial anodes to remove pollutants via electrostatic attraction. Also, it aims to increase biological degradation under anaerobic conditions. The study optimized the electrocoagulation process using Response Surface Methodology (RSM), with pH (7–11), voltage (10–30 V), and electrolysis time (10–60 min) as operational parameters, and measured parameters including Chemical Oxygen Demand (COD), phenol, Total Solid (TS), Total Dissolved Solid (TDS), color, pH, and Specific Energy Consumption (SEC). The optimal conditions (pH 9, 20 V, 35 min) removed 49.40% COD, 43.61% phenol, 53.89% TS, 46.50% TDS, and 29.33% color, reducing black liquor alkalinity by 0.52 pH. Moreover, anaerobic digestion was conducted for 36 days (digested sludge as an Inoculum) with untreated and pretreated black liquor (at concentrations of 10% and 30%), which showed an increment of 40% and 99.50% in biogas yield for the treated one, respectively. This research suggests electrocoagulation as a promising pretreatment method for enhancing the biological degradation of black liquor.

Graphical Abstract