电絮凝技术在棉浆黑液处理上的应用

Preliminary Study on the Application of Electrocoagulation Process in Cotton Pulping Black Liquor Treatment

关键词:  棉浆黑液  混凝  电絮凝

Key Words:cotton pulp black liquor  coagulation  electrocoagulation

摘要:分别采用电絮凝法、化学絮凝法和混凝-电絮凝复合工艺对棉浆稀黑液进行处理。结果表明，采用电絮凝法，当初始pH值为9.0、电流密度为150 A/m²、反应时间为90 min时，COD_Cr和色度的去除率分别达到64.0%和88.6%；初始棉浆稀黑液浓度和NaCl浓度对处理效果影响不大。采用化学絮凝法，当初始pH值为6.0、PAC用量为500 mg/L、CPAM用量为3 mg/L时，COD_Cr与色度的去除率分别能达到39.3%和78.2%。采用混凝-电絮凝复合工艺，在初始pH值为9.0、PAC用量为200 mg/L、电流密度为100 A/m²、反应时间为60 min时，COD_Cr和色度的去除率分别为64.4%和91.3%。

Abstract:The paper investigated the effect of electrocoagulation, chemical coagulation and the combined process on the removal of COD_Cr and color from the diluted cotton pulping black liquor. The results showed that when initial pH was 9.0, current density was 150 A/m² and treatment time was 90 min, the removal rates of COD_Cr and color were 64.0% and 88.6% respectively by electrocoagulation method. Both initial wastewater consistency and NaCl consistency had little effect on the removal efficiency. When initial pH was 6, PAC dosage was 500 mg/L and PAM dosage was 3 mg/L, the removal rates of COD_Cr and color were 39.3% and 78.2% respectively by chemical coagulation method. When initial pH was 9.0, PAC dosage was 200 mg/L, current density was 100 A/m² and treatment time was 60 min, the removal rates of COD_Cr and color were 64.4% and 91.3% respectively by the combined method.