受木屑污染雨水中氮的去除  

Study on Nitrogen Removal in Rainwater Palluted by Wood Chips

作　　者：郑作添[1,2] 周荣丰[1] 卢亮[3] 

机构地区：[1]同济大学城市污染控制国家工程研究中心,上海200092 [2]法国国立农业学院,巴黎 [3]河北工程大学城市建设学院,河北邯郸056038

出　　处：《净水技术》2007年第3期25-28,共4页Water Purification Technology

摘　　要：采用过滤、混凝澄清和化学氧化法对受木屑污染的雨水中的氮进行了去除研究。实验结果表明90%氮在雨水中以溶解态存在,难以通过过滤、混凝澄清等物理方法去除。次氯酸钠氧化法能高效氧化水中的氨氮并以氮气的形式去除,氨氮的去除量同次氯酸钠剂量呈线性关系,去除1g氨氮需要8.86g活性氯(以Cl2计)。综合投加不同剂量的次氯酸钠后测定了水中余氯、总氮、氨氮等含量曲线,污水中氨氮优先于有机氮同次氯酸钠反应而去除,因而可控制加药量而避免产生大量消毒副产物(DBPS)。同时研究了加药后氧化还原电位(ORP),表明可通过ORP的变化为运行控制提供简便可靠的依据。Filtration, coagulation and flocculation, and oxidation were used to remove the nitrogen from rainwater polluted by wood chips. The results showed that 90% of nitrogen in rainwater is soluble and can not be removed by filtration or coagulation/flocculation, but can be removed by reaction with NaClO： ammonia is oxidized as gaseous nitrogen. The relation between the removal quantity of ammonia and the dosage of NaClO was linear. The removal of 1 g ammonia needed 8.86 g active chlorine （Cl2）. In combination of the relations between the dosages of sodium hypochlorite with residual chlorine, TN, N-NH3, etc., it could be concluded that the reaction between ammonia and sodium hypochlorite is prior to other organic nitrogen in wastewater. Thus, the disinfecting by-products （DBPs） can be reduced by limited dosage of NaClO. The effect of dosage of NaClO on ORP was also studied for the control of the dosage in site.

关 键 词：总氮 氨氮 雨水 次氯酸钠 过滤 氧化还原电位 

分 类 号：TU992.032[建筑科学—市政工程]