| 孙玉茹,齐健,吕鹏静,杨煜鑫,杜佩卿,黄金达,陈妍,朱勇,刘春兰,于孟辉,王高升.麦草高得率浆废水中木质素和硅的同时去除及后续处理途径研究[J].中国造纸学报,2025,40(4):122-131 |
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| 麦草高得率浆废水中木质素和硅的同时去除及后续处理途径研究 |
| Study on Simultaneous Removal of Lignin and Silica from Wastewater of Wheat Straw High-yield Pulp and Subsequent Treatment Approach |
| 投稿时间：2025-01-03 修订日期：2025-02-27 |
| DOI：10.11981/j.issn.1000-6842.2025.04.122 |
| 中文关键词: 废水 麦草高得率浆 木质素 硅 絮凝 可生化性 |
| Key Words:wastewater wheat straw high-yield pulp lignin silica coagulation biodegradability |
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| 中文摘要: |
| 为降低木质素对高得率浆废水沼气发酵的抑制以及硅在浓缩废水燃烧过程中造成的干扰，本研究以实验室模拟制备的麦草高得率浆废水为原料，探究了硫酸铝絮凝工艺对废水中木质素和硅的同时去除效果，并分析了絮凝后废水采用蒸发燃烧与沼气发酵2种处理途径的可行性。结果表明，在硫酸铝添加量0.25~4.0 g/L、废水终端pH值=5~10的实验条件下，废水浊度的去除率与木质素和硅的去除率均呈现高度线性相关。当硫酸铝添加量2.5 g/L、废水终端pH值=7时，木质素与硅的去除效果最佳，去除率分别达80.7%和53.7%。经过硫酸铝絮凝后，废水的可生化性、甲烷生产速率及甲烷产量相较于原始废水分别提升了39.4%、60.5%和25.4%；同时，将废水浓缩至固含量20%时，其黏度降低了73.9%。以1 000 kg废水为基准，絮凝后废水采用蒸发燃烧途径所获得的燃烧热值为51.22 MJ，高于沼气发酵生成甲烷的热值（37.60 MJ），表明在该条件下蒸发燃烧为更优处理途径。 |
| Abstract: |
| This study investigated the simultaneous removal of lignin and silicon from wastewater of lab-simulated wheat straw high-yield pulp using aluminum sulfate flocculation to mitigate the inhibition of lignin on anaerobic digestion and the interference of silicon during combustion of concentrated high-yield pulping wastewater. The feasibilities of two treatment pathways of evaporation combustion and anaerobic digestion for the flocculated wastewater were evaluated. The results showed that under experimental conditions with aluminum sulfate dosage of 0.25~4.0 g/L and final pH value of wastewater of 5~10， wastewater turbidity removal rate exhibited highly linear correlations with both lignin and silicon removal rates. The optimal removal efficiencies of lignin （80.7%） and silicon （53.7%） were achieved at aluminum sulfate dosage of 2.5 g/L and final pH value of wastewater of 7. After coagulation， the biodegradability， methane production rate， and cumulative methane yield of the wastewater increased by 39.4%， 60.5%， and 25.4%， respectively， compared to the raw wastewater. Moreover， the viscosity of the wastewater concentrated to 20% solid content was reduced by 73.9%. Based on the 1 000 kg of wastewater， the combustion heat obtained via the evaporation-combustion pathway （51.22 MJ） was higher than that from methane combustion via anaerobic digestion （37.60 MJ）， indicating that evaporation combustion was the preferable treatment option under these conditions. |
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