Study on pilot test of EF-Feox method applied to pre-treat washing and cooling waste water of coal gas

According to hard biodegraded phenols, romantic hydrocarbon, ammonia nitrogen and other toxic and harmful substances in the washing and cooling wa ste water of the coal gas from coal-gas generation station, those substances would cause great harms to the human and environment. The EF-Feox method was applie d to treat an actual coal gas washing and cooling waste water in a pilot test and individually to study the current, p H, H2O2 dose and other factors affected to the remo val effects. A central complex test with three factors and three levels was applied to the design of the response surface. A comprehensive considered economic factor a nd engineering feasibility were applied to asset up the optimized technical conditions. The results showed that when the p H was 4.0, H2O2 dosage was 3.0 m L/L, curr ent was 0.6 A, electrolyte Na CI concentration was 17 mmol/L, space between the polar plates was 100 mm and hydraulic retention time was3 h, a removal rate of the p henols from the waste water could be 92.82%. The removal rate of CODcrwould not be high, but the biodegradability ( B/C) could be improved from an initial 0.09 to 0.4 4 and could be suitable the pre-treatment of the biochemical treatment.