Experimental research on treating reservoir water contaminated by algae using GAC-sand dual media filter flofilter
WANG Yonglei, LI Jun, ZHANG Kefeng, JIA Ruibao, LI Mei, SONG Wuchang, LI Ying
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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.