Infuence of temperature and the size of initial particles on flocs breakage and re-growth

Abstract:

This paper investigated the effect of temperature and the size of original particles on the flocs regrowth capability and the particles removal by flocs breakage and re-growth.The process of formation,breakage,and re-growth of flocs was investigated with PDA 2000.It is found that there is a full re-growth of broken flocs when coagulating in charge neutrality,while coagulating in sweep coagulation,the break-up process of flocs displays distinct irreversibility.The lower temperature results in the higher re-growth capability of broken flocs,and the reversibility of broken flocs formed by small particles is lower than that formed by big particles.The residual turbidity after re-growth of broken flocs is significantly lower than that before flocs breakage,which was little influenced by temperature.The size of original particles has positive effect on the discrepancy of residual turbidity before and after breakage.The technology can be used for the surface water with big particles and low temperature.