PAC投加对絮体破碎后再絮凝特性和颗粒去除的影响

发布时间：2018-03-26 17:03

本文选题：絮凝体破碎　切入点：再絮凝　出处：《哈尔滨工业大学学报》2015年02期

【摘要】：为改善絮体破碎后的再絮凝能力,提高颗粒的去除效率,以西宁地区低温低浊水为研究对象,通过光学检测仪器及数学拟合方式,分析补投聚合氯化铝(PAC)对破碎后絮体粒径与分布、生长速率变化的影响,描述颗粒及浊度的去除效果.结果表明:随PAC补投量的升高,絮体粒径和生长速率均先增大后减小,各自达到峰值所需补投药量分别为4和6 mg/L;剩余浊度和颗粒数先降低后升高,最低时可分别降至0.79 NTU、90个·m L-1.补投2 mg/L药剂后,280~630μm絮体颗粒体积分数由22.85%增大到46.36%,4~35μm絮体颗粒体积分数由1.21%减小至0.19%,再絮凝后絮体平均粒径为400μm,大于未破碎前的370μm,粒径增长率为8.11%,絮体生长速率为77.26μm/min.补投PAC可促进絮体破碎后的再絮凝,提高浊度及颗粒数的去除效果,可有效改善实际工程絮凝工艺效果.
[Abstract]:In order to improve the flocculation ability of the floc after crushing and improve the removal efficiency of the particles, the low temperature and low turbidity water in Xining area was taken as the research object, and the optical detection instrument and mathematical fitting method were used. The effects of polyaluminum chloride (PAC) on the particle size and distribution and growth rate of the flocs after crushing were analyzed. The removal effect of particles and turbidity was described. The results showed that the particle size and growth rate increased first and then decreased with the increase of PAC supplementation. The amount of recharge needed to reach the peak value was 4 mg / L and 6 mg / L, respectively. The residual turbidity and particle number decreased first and then increased. The volume fraction of flocs increased from 22.85% to 46.36 渭 m from 1.21% to 0.19 渭 m. The average particle size of flocs after flocculation was 400 渭 m, which was larger than that before unbroken. The diameter growth rate is 8.11 and the floc growth rate is 77.26 渭 m / min. The addition of PAC can promote the flocculation after the floc is broken. The effect of flocculation process can be improved effectively by increasing turbidity and particle number.
【作者单位】：哈尔滨工业大学市政环境工程学院;城市水资源与水环境国家重点实验室(哈尔滨工业大学);
【基金】：国家自然科学基金(51278143E0804) 国家科技重大专项(2014ZX07202-011)
【分类号】：TU991.2

【共引文献】