Monitoring of aggregation process
Particle aggregation(coagulation/flocculation)is a vitally important process in water and wastewater treatment and Can have very significant effects on the efficiency of solid-liquid separation operations．Optimising aggregation processes requires some form of monitoring technique，for instance by measurement of aggregate(floc)size or of some related property such as setting rate or filterability．If a convenient monitoring method is available，then it is possible to optimise coagulant dosage，mixing conditions and other factors．In broad terms，an aggregation process involves essentially two steps：a)Destabilization of particles by the addition of coagulants/flocculants or possibly by adjusting chemical conditions(e．g．by chartging pH)b) Collisions of destabilized particles to form aggregates(flocs)．These most commonly occur by Brownian diffusion(perikinetic aggregation)or by induced fluid motion(orthokinetic aggregation)．These steps are illustrated schematically in Figure 1，which also gives some possible monitoring approaches．
John GREGORY
University College London,UK
国际会议
西安
英文
17-25
2008-05-15（万方平台首次上网日期，不代表论文的发表时间）