The invention discloses an efficient reverse-
osmosis concentrated
water treatment method. The method comprises steps as follows: 1), the
pH range of reverse-
osmosis concentrated water is adjusted to be 6-9; 2), H2O2 is added, and the mixture reacts for 5-20 minutes; 3), the mixture enters an ozonation
tower, the concentration of O3 in the ozonation
tower is 50-200 mg / L, and the reverse-
osmosis concentrated water stays for 0.5 h-2 h in the
tower; 4), the mixture enters an electrocatalytic oxidation reactor and stays for 0.5 h-1.5 h in the tower; 5), the mixture enters a coagulative
precipitation tank, PAM (
polyacrylamide) is added, the mixture is subjected to coagulation stirring through a stirrer for 15-20 min; 6), the mixture enters a
mechanical filter after being settled by a sloping plate, and filtered
effluent is discharged up to standard. The method is not only suitable for high-
salinity and high-
alkalinity concentrated water produced through
reverse osmosis recycling treatment after various kinds of up-to-standard biochemical treatment and is also applicable to other
wastewater difficult to treat. The CODcr of the treated
effluent is reduced to be under 60 mg / L from 120-400 mg / L and reaches the first-grade B standard in
Discharge Standard of Pollutants for Municipal
Wastewater Treatment
Plant (GB 18918-2002).