蒙脱石絮凝剂对疏浚底泥的絮凝快速分离  

Rapid separation of dredged sludges by montmorillonite flocculant

作　　者：王昶 王远东 郝林林 邓瑞 曾明 WANG Chang;WANG Yuandong;HAO Linlin;DENG Rui;ZENG Ming(Department of Marine and Environmental Sciences,Tianjin University of Science and Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学海洋与环境学院,天津300457

出　　处：《环境工程学报》2020年第6期1465-1470,共6页Chinese Journal of Environmental Engineering

基　　金：宁夏回族自治区重点研发计划重大(重点)项目(2019BBF02024)。

摘　　要：为了快速对污染的河道湖泊进行清淤,使用酸改性的蒙脱石絮凝剂(MTSF)对底泥泥水进行了一级强化处理研究。结果表明:MTSF对底泥泥水具有很好的絮凝效果,当MTSF为0.3 g时,上清液的Zeta电位大约为0 mV,浑浊的泥水变为清澈透明,此时浊度、NH4+-N、 TP、 SS和COD的去除率分别为98.8%、 29.8%、99.6%、97.7%和56.9%;C-PAM助凝剂的少量投加,有助于絮凝过程,MTSF为0.3 g,C-PAM为8 mg·L-1时,上清液的浊度和COD将会进一步降低,分别从9.0 NTU和51.6 mg·L-1减少到4.7 NTU和15.0 mg·L-1;C-PAM助凝剂能够将絮体进一步结团,形成更大的絮体,促进絮体的快速沉降,同时还有助于对水相中污染物的进一步去除。两者的结合可以减少MTSF用量,达到更好的效果。In order to rapidly dredge the polluted rivers or lakes, an acid-modified montmorillonite flocculant(MTSF) was used to study the enhanced primary treatment of the dredged sludges. The experimental results showed that MTSF had a very good performance on the dredging sludge flocculation, when MTSF dosage was 0.3 g, the Zeta potential of the supernatants approached to 0 mV, the muddy water became clear and transparent,the corresponding removal efficiencies of turbidity, NH4+-N, TP, SS and COD were 98.8%, 29.8%, 99.6%, 97.7%and 56.9%, respectively. A small amount of flocculation aid C-PAM could facilitate the flocculation process,when MTSF and C-PAM dosages were 0.3 g and 8 mg·L-1, turbidity and COD of the supernatants were further reduced from 9.0 NTU and 51.6 mg·L-1 to 4.7 NTU and 15.0 mg·L-1, respectively. C-PAM could further agglomerate flocs to larger ones, so as to promote their rapid settlement, and was also helpful to further remove other pollutants from the aqueous phase. The combination of MTFS and C-PAM can significantly reduce the dosage of MTSF and achieve better results.

关 键 词：蒙脱石絮凝剂 絮凝机理 沉降性能 聚丙烯酰胺(C-PAM) 疏浚底泥处理 

分 类 号：X703[环境科学与工程—环境工程]