新型复合钝化剂对上覆水体及底泥pH-Eh-COD的影响  

Effects of New Composite Agent on Overlying Water and Sediment for Organic Pollutants

作　　者：谢红梅 刘泷霞 Xie Hongmei;Liu Shuangxia(Guangzhou New Jinjiang Environment Technology Co.,Ltd.,Guangzhou 510700,China)

机构地区：[1]广州新金江环境科技有限公司,广东广州510700

出　　处：《广东化工》2021年第10期127-129,158,共4页Guangdong Chemical Industry

摘　　要：本研究采用底泥原位钝化技术对城市河道进行模拟药剂投加,在实验预定周期35天内分别投复合钝化剂、硫酸铝、硝酸钙和零价铁4种钝化剂,测定各实验组底泥及上覆水的pH-Eh-COD。结果表明,投加Fe^(0)和硝酸钙后会使上覆水体和底泥的pH值分别增大至8.7和8.4左右,投加复合钝化剂组的上覆水和底泥的pH值均与空白相近;向底泥中投加Fe^(0)会使上覆水及底泥Eh呈急剧下降趋势,投加复合药剂和硝酸钙会增大上覆水及底泥Eh;复合药剂和Al_(2)(SO_(4))_(3)均能降低上覆水COD,投加复合药剂对COD的去除效果更加显著,在反应周期内,投加硝酸钙会增大上覆水COD。从不同钝化剂对底泥有机质的降解率来看,复合钝化剂对底泥有机质降解率高达35.41%。因此,复合钝化剂克服了单一药剂的不足,在原位钝化技术中取得了显著效果。In this study,technology of in-situ sediment treatment was adopted with the addition of chemical agent to organic pollutants.During 35-day experiment period,new composite chemical,aluminum sulfate,calcium nitrate and zero valent iron were added respectively to the sediment.The results showed that with the addition of Fe^(0)or calcium nitrate,the pH value of overlying water and sediment increased to 8.7 and 8.4 respectively;with the addition of compound passivator,the pH value of overlying and sediment were close to the blank;with the addition of Fe^(0),Eh value of overlying water and sediment dropped sharply.While with the addition of compound passivator and calcium nitrate,Eh of overlying water and sediment increased.The COD value of overlying water was down both with the addition of new composite chemical and that of aluminum sulfate,and the former had even more significant removal efficiency.In the reaction period,the COD value of overlying water increased with the addition of calcium nitrate.As for the degradation rate of different chemical agents to organic matter in the sediment,the new composite chemicals can reach up to 35.41%.It turned out that new composite chemicals covered the shortage of single agent,achieving significant result in the technology of in-situ sediment treatment.

关 键 词：复合钝化剂 上覆水体 底泥 铁盐 铝盐 硝酸钙 

分 类 号：X522[环境科学与工程—环境工程]