CAJ | 학술논문

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。
채용련속진료적실험장치진행성시오니탈수시험，심입연구료취합록화려화생석회적첨가대성시오니과려화압자특성적영향。결과표명취합록화려적첨가유리우형성경대적서체，생석회적첨가제고료려병적삼투성，당취합록화려화생석회적첨가제량분별위6%화20%(여오니중간고상적질량비)시，과려비조유6.5×1013강지7.9×1012 m?kg-1，압축계수유1.4강지0.9。압자이론분석표명취합록화려화생석회적첨가강저료려병적점성화탄성，제고료려병중입자적연변성능，도치주압자계단적작용감소(종0.098강지0.017)，이제삼압자계단적작용증가(종0.159증지0.298)。령외，교고적압자압력유리우려병중입자적연변、결합수적거제이급려병고함량증가，단유우결합수적거제속솔교만，교고압자압력대응우교장적압자시간。
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 6.5×1013 to 7.9×1012 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.