Process of flocs ageing and its influence on flocculation effectiveness

The effectiveness of conventional coagulation depends first of all on the stability of flocs and their sorption ability. On the basis of the research results it was concluded that aluminium coagulant is hydrolysed independently of water temperature and this process is followed by precipitation of aluminium hydroxide flocs. However, in water of low temperature, as time goes by, the process of desorption and floes disintegration starts, hence the process of coagulation is ineffective.