The algae pollution of reservoir water is serious increasingly

the traditional process of sedimentation solid-liquid separation hardly meets the requirement of clearwater. GAC-sand-double-filtration flofilter was built to treat the high algae reservoir water derived from yellow river

and the running and operating characteristics of this flofilter were investigated. The experiment results showed that

the effect of running was excellent when polyaluminum ferric chloride(PAFC) dosage was 4.0 mg·L-1 (Al3+)

air pressure 0.4 MPa

and reflux ratio 8%. Biomass of GAC and sand filter layer mainly existed in the carbon layer

which accounted for 97.4% (the highest value was 50.2 nmol P·g-1)

and its biomass was 16.7 times of sand layer (3.0 nmol P·g-1)

so the removal of pollutants occured mainly in the carbon layer. During the test

removal efficiency of particulate matter

blue-green algae

turbidity

CODMn

NPOC

UV254

ammonia nitrogen reached 96.48%

92.40%

92.56%

57.41%

51.60%

52.50%

75.67% respectively. Odor reduced from 4 to 0. Contents of geosmin and methylisoborneol were both less than the detection limit. Removal efficiency of chloroform

chlorodibromomethane reached 60% and 55.1%. The results showed that

flofilter process had a great removal on conventional index

algae

odor substances and disinfection byproducts precursors.