Modified electrocoagulation process with porous nonwoven partition for advanced phosphorus control

摘要

Modified electrocoagulation (EC) process was applied in the treatment of phosphorus in municipal wastewater through laboratory and pilot-scale experiments. Porous nonwoven partition was equipped between electrodes in the EC system to separate chemical reactions in anode and cathode. The modified EC system consisting of partitioned electrocoagulation tank, slow-mixing tank, and membrane filtration tank was investigated to treat municipal wastewater from first and secondary settling tanks. Analyses of the water quality in partitioned cathodes and anodes and the following treatment tanks showed that each electrode provided different reaction conditions in pH, SS, S-P, and T-Fe concentrations efficient for the treatment of soluble P and suspended solids. Comparative SS levels in the treated waters from conventional and partitioned EC system showed 49-63% decrease in sludge production in the partitioned EC, and the S-P removal efficiency was improved from 22% in conventional EC to 94% in the modified EC system.