Study on feeding mode of coagulant in high turbidity mine water treatment

According to high colloidal particle contents, small particle diameter,small volume quantity and other water quality features ofthe high turbidity mine water,a coagulation test study was conducted on different feeding modes of a coagulant with PAC and PAM. An op-timum dosage and treatment effect of the coagulant under each feeding mode was investigated and an analysis was conducted on an opti-mum feeding interval time of PAC and PAM. The results showed that a turbidity of the original wa ter was 2 450 NTU,a first PAM feedingwith a concentration of 0.5 mg/ L was applied and then a second PAC feeding with a concentration of 100 mg/ L and a PAM feeding witha concentration of 0.4 mg/ L was applied,a min turbidity of 4.6 NTU was measured in the water outlet and the total cost of coagulant wasthe lowest. In different feedin g interval time of PAC and PAM,when a feeding point of PAM was 120 s delay then the feeding point ofPAC,the coagulation effect would be the best.