• 关键词：造纸废水  混凝  电离辐射  深度处理  相对分子质量分布

• 基金项目：国家自然科学基金项目(No.10975085);国家高技术研究发展计划(863)项目(No. 2009AA063905)

• 万建信
• 1. 清华大学 核能与新能源技术研究院,北京 100084;
  2. 武汉理工大学 资源与环境工程学院,武汉 430070

• 吴小缓
• 建筑材料工业技术情报研究所,北京100024

• 何仕均
• 清华大学 核能与新能源技术研究院,北京 100084

• 方继敏
• 武汉理工大学 资源与环境工程学院,武汉 430070

• 王建龙
• 清华大学 核能与新能源技术研究院,北京 100084

• 摘要：探讨了采用电离辐射对造纸废水二级生化出水进行深度处理的可行性.结果表明,二级生化出水主要由相对分子质量为1000~3000和3000以上的有机物组成,它们对COD的贡献分别为69.5%和6.9%,它们对溶解性有机质(DOC)的贡献分别为40.6%和31.6%.电离辐射促使废水中的一些大分子有机物向小分子有机物转化,相对分子质量为1000~3000的有机物的COD持续降低,相对分子质量小于1000的有机物的COD不断升高.混凝能够有效去除二级生化出水中相对分子质量大于3000的有机物,去除率达到60%,并且显著降低废水的吸光度.经过混凝预处理后,随着辐射剂量的增加,二级生化出水的BOD₅上升,表明废水的可生化性提高.与造纸废水的预处理相比,混凝-辐照组合工艺更适合于造纸废水的深度处理.

• Abstract：The feasibility of treating secondary biological paper mill effluent by ionizing radiation was studied experimentally. The results showed that COD of wastewater mainly consists of 69.5% of organic compounds (1000<M_r<3000) and 6.9% of organic compounds (M_r>3000). DOC of wastewater mainly consists of 40.6% of organic compounds (1000<M_r<3000) and 31.6% of organic compounds (M_r>3000). Ionizing radiation may enhance transformation from the high molecular organic compounds (1000<M_r<3000) to low molecular organic compounds (M_r<1000), resulting in gradual decrease of COD of organic compounds (1000<M_r<3000) and increase of COD of organic compounds (M_r<1000). In addition, coagulation can remove organic compounds (M_r>3000) effectively with the removal rate 60%, and reduce the absorbance significantly. With radiation doses increasing, the BOD₅ concentration of secondary effluent increased, indicating the enhancement of biodegradability. Compared with pre-treatment of the paper mill effluent, the combined process of coagulation and ionizing radiation possesses was more suitable for the advanced treatment of paper mill effluent.

• Key words：paper mill effluent  coagulation  ionizing radiation  advanced treatment  relative molecular mass distribution

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