复合调理剂对城市污泥过滤压榨特性的影响  

Effect of Composite Flocculants on Filtration and Expression of Municipal Sludge

作　　者：冯国红[1,2] 谭蔚[1] 陈晓楠[1] 刘颖[1] 贺仲宪 刘丽艳[1] 

机构地区：[1]天津大学化工学院,天津300072 [2]太原科技大学环境与安全学院,山西太原030024 [3]浙江金鸟压滤机有限公司,浙江杭州310031

出　　处：《高校化学工程学报》2014年第4期876-881,共6页Journal of Chemical Engineering of Chinese Universities

摘　　要：采用连续进料的实验装置进行城市污泥脱水试验,深入研究了聚合氯化铝和生石灰的添加对城市污泥过滤和压榨特性的影响。结果表明聚合氯化铝的添加有利于形成更大的絮体,生石灰的添加提高了滤饼的渗透性,当聚合氯化铝和生石灰的添加剂量分别为6%和20%(与污泥中干固相的质量比)时,过滤比阻由6.5×1013降至7.9×1012 m·kg-1,压缩系数由1.4降至0.9。压榨理论分析表明聚合氯化铝和生石灰的添加降低了滤饼的黏性和弹性,提高了滤饼中粒子的蠕变性能,导致主压榨阶段的作用减小(从0.098降至0.017),而第三压榨阶段的作用增加(从0.159增至0.298)。另外,较高的压榨压力有利于滤饼中粒子的蠕变、结合水的去除以及滤饼固含量增加,但由于结合水的去除速率较慢,较高压榨压力对应于较长的压榨时间。A series of dewatering experiments were carried out using an experimental filtration device with continuous feeding systems to study the effects of adding aluminum polychlorid and lime on filtration and expression of municipal sludge. The results indicate that aluminum polychlorid has advantage in forming larger flocs, and lime can increase the permeability of filter cake. When 6% and 20% （weight percentage： flocculants/dry solid mass in sludge） of the two flocculants were used respectively, specific resistances to filtration and compression coefficient decrease from 6.5×10^13 to 7.9× 10^12 m.kg^-1 and 1.4 to 0.9, respectively. Results analysis indicates that the elasticity and viscosity of the cake decrease after conditioning and creep of particles in cakes becomes much easier, which leads to less important of the primary expression stage （from 0.098 to 0.017） and more important of the third expression stage （from 0.159 to 0.298）. With the increase of expression pressure, creep of particles in cakes becomes much easier and more bound water can be removed, which results in a drier cake. However the bound water removal rate is low, and higher expression pressure corresponds with longer expression time.

关 键 词：聚合氯化铝 生石灰 城市污泥 过滤 压榨 

分 类 号：X705[环境科学与工程—环境工程] TQ028.55[化学工程]