Efficient reverse-osmosis concentrated water treatment method

Abstract

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).

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a high-efficiency reverse osmosis concentrated water treatment method. Background technique [0002] As an efficient and clean desalination technology, the reverse osmosis process is widely used in all walks of life, but in the production process, there will be reverse osmosis concentrated water discharge, which accounts for about 30% of the total water inflow, referred to as RO concentrated water. Pollutants such as salt and CODcr in RO concentrated water are concentrated by about 3-4 times, and the content of hardness, alkalinity, and organic matter in the concentrated water is relatively greatly increased. The CODcr of concentrated wastewater is generally 120-400mg / L, and the conductivity is generally 4000 -20000μs / cm, if this kind of wastewater is discharged directly without treatment, it will cause great harm to the environment and have a significant impact on people's produc...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the disadvantages of the existing reverse osmosis concentrated water process, such as large investment, complex process, high operating cost, difficulty in industrial implementation, or secondary pollution to the environment, and to provide a high-efficiency reverse osmosis concentrated water process. water treatment method

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