分散剂对脱水污泥流动性能的影响

采用旋转粘度法研究了高速搅拌时间以及有机、无机分散剂对脱水污泥流动性能的影响,结果表明:采用高速机械搅拌的方法能够使污泥的表观粘度降低,经过30s后表观粘度可由8500mPa·s降低到2740mPa·s,流动性增大;在此基础上掺加1%的萘系磺酸盐或2%的酒石酸钾钠可使污泥的表观粘度由2740mPa·s分别降到1840mPa·s与1640mPa·s,并且将这两种分散剂复合后加入到脱水污泥中,可以使污泥的表观粘度由2740mPa·s降到1360mPa·s,表观粘度明显降低。此课题的研究为脱水污泥的处理与处置提供了有利的试验依据。

Influence of Dispersant on Rheological Properties of Dewatered Sludge

Rotation viscosity method was used to study the rheological properties of dewatered sludge which was affected by different shearing times and with different dosages of organic or inorganic dispersants.Viscosity changes of dewatered sludge under different mechanical shearing times and dewatered sludge viscosity improved with different dosage of organic or inorganic dispersants were involved in the study as well.Results revealed that high speed mechanical shearing method can improve the rheological properties of dewatered sludge and reduce the apparent viscosity greatly.Mechanical shearing of 30s can reduce apparent viscosity of dewatered sludge from 8,500mPa·s to 2,740mPa·s.On this basis,addition of 1% admixture of the organic dispersing agent or 2% of inorganic dispersants to dewatered sludge can make its apparent viscosity reduce from 2,740mPa·s to 1,840mPa·s and 1,640mPa·s respectively.Compound organic and inorganic dispersants to the sludge over 30s shearing can reduce its apparent viscosity from 2,740mPa·s to 1,360mPa·s.Dewatered sludge showed the thinning fluid property.The study can provide a favorable test for treatment and disposal of dewatered sludge.