臭氧处理造纸废水生化出水的氮素变化  

Nitrogen Transformation in Ozonation of Effluent from a Paper-mill Wastewater Treatment Plant

作　　者：曾科[1] 崔燕平[1] 郝甜利 张宏超[1] 黄丽君[1] 

机构地区：[1]郑州大学水利与环境学院,河南郑州450002

出　　处：《环境科学与技术》2014年第12期209-213,共5页Environmental Science & Technology

基　　金：国家水体污染与治理科技重大专项:麦草制浆造纸废水深度净化与回用关键技术研究与示范子课题(2009ZX07210-002-001)

摘　　要：中试利用空气产生臭氧,在氧化塔中处理造纸废水生化出水,改变臭氧投加量和接触时间,测试出水总氮和硝酸盐氮含量的变化,分析废水中总氮和硝酸盐氮含量变化的原因和规律。结果表明：氧化后,臭氧化空气中氮氧化物的溶入使废水中的氮含量增加,出水总氮含量为进水的1.01~1.38倍,溶解转移导致的总氮增量不大,仅占出水总氮的6.54%~27.53%。与27.53%的总氮增加率对比,硝酸盐氮的增加量均较大,增加率达到了约78%,氧化转化导致的氮素浓度增加大于溶解转移导致的氮素浓度增加。当接触时间为0.62~2.40 h,出水的总氮为进水的1.07~1.38倍,随着接触时间的增加,出水总氮和硝酸盐氮的增加量升高,出水中溶解累积的氮氧化物的量增加。A pilot-plant experiment was carried out for researching ozone-treating process of secondary effluent from a paper-mill wastewater treatment system,focusing on the transformation of content of TN（total nitrogen）and nitrate nitrogen contained in the effluent with the changes of ozone dosage and contact time. Results of the experiment suggested that the dissolution of nitrogen oxides into the effluent caused by ozonation process resulted in an increase of TN concentration in effluent,i.e.,1.01 to 1.38 times that in the influent,a small increase rate（6.54% to 27.53% of TN in effluent） compared with the increment of nitrate nitrogen in effluent（77.50%）. However,nitrogen concentration increment caused by ozone oxidation was more than that caused by the dissolution of nitrogen oxides. When contact time was kept within the range from 0.62 to 2.40 h,TN concentration in the effluent was 1.07 to 1.38 times that in the influent. As the contact time increase,so did the increments of TN and nitrate nitrogen in effluent;meanwhile,the cumulated nitrogen oxides caused by dissolution in the effluent increased as well.

关 键 词：臭氧氧化 生化出水 氮素浓度 造纸废水 

分 类 号：X506[环境科学与工程—环境工程]