酸浸赤泥制备含碳聚硅酸铝铁絮凝剂及其污泥脱水性能研究  

The preparison and sludge-dewatering properties of R-CSiAFS composite flocculant made from acid-treated red mud

作　　者：谢武明[1] 马峡珍 李俊[1] 周峰平[1] 张宁[1] 顾舸 许小丹[1] 刘敬勇[1] 张文治 

机构地区：[1]广东工业大学环境科学与工程学院,广州510006 [2]广东工业大学轻工化工学院,广州510006 [3]广东环境保护工程职业学院,佛山528216

出　　处：《环境科学学报》2017年第9期3464-3470,共7页Acta Scientiae Circumstantiae

基　　金：广东省重大科技专项(No.2015B010110004);广州市科技计划项目(No.2014Y2-00214);广东省大学生创新创业训练计划项目(No.201511845031)~~

摘　　要：以改性淀粉、拜尔法赤泥为原料,制备了含碳聚硅酸铝铁絮凝剂(R-CSiAFS),研究其对污泥的脱水性能,并采用红外光谱仪(FTIR)、X射线衍射仪(XRD)、扫描电镜(SEM)和热重分析仪(TGA)对R-CSiAFS复合絮凝剂进行表征.结果表明,赤泥经硫酸前处理后,总铁(TFe)和Al^(3+)的浸出率分别为81.44%和96.83%.在(Al+Fe)/淀粉质量比为0.55/1,最佳pH=3.0,SiO_2质量分数为0.375%的条件下制得最优R-CSiAFS.利用此絮凝剂进行污泥脱水实验,当投加量为330 mg·L^(-1),污泥体系pH为7.0时,污泥比阻SRF降低了92.3%,沉降比SV30从90.0%降低到79.9%.R-CSiAFS flocculant combined silicon-aluminum-ferric-starch was prepared using the raw material including the modified starch and red mud produced in bayer process.The R-CSiAFS composite flocculant was characterized using FTIR, XRD, SEM, and TGA. After treated by sulfuric acid, the leaching rate of TFe and Al3＋ from red mud were 81.44% and 96.83% respectively. The optimal conditions are the mass rate of Al＋Fe and starch of 0.55/1 ,the pH of 3.0,and the SiO2content of 0.375%.Compared with raw sludge, the sludge SRF decreased by 92.3%, the SV30 decreased from 90.0% to 79.9% when the dosages of R-CSiAFS was 330 mg·L-lunder pH 7.0.

关 键 词：赤泥 硫酸浸取 聚硅酸铝铁 絮凝剂 污泥脱水 

分 类 号：X703[环境科学与工程—环境工程]