Novel reverse osmosis membrane treatment system for dyeing wastewater advanced treatment

Abstract

The invention provides a novel reverse osmosis membrane treatment system for dyeing wastewater advanced treatment, which is provided with a high-pressure pump and a reverse osmosis unit, wherein the high-pressure pump is used for enhancing raw water pressure to inlet water pressure of the reverse osmosis unit; a cartridge filter is arranged before a water inlet of the high-pressure pump; and a water outlet is connected with a water inlet pipe of the reverse osmosis unit. The system is characterized in that the reverse osmosis unit is arranged in a one-section mode; a concentrated water outlet pipeline connected with a concentrated water outlet of the reverse osmosis unit is divided into two paths, one path is a concentrated water discharge pipeline, and the other path is a recovery pipeline; the recovery pipeline is connected with a concentrated water circulating pump; the concentrated water circulating pump is used for enhancing recovered concentrated water pressure to inlet water pressure of the reverse osmosis unit; and the recovery pipeline is connected with a water inlet pipe of the reverse osmosis unit at the downstream of the high-pressure pump. The system has the advantages of simple structure, low cost and high recovery rate (up to 50%), can satisfy the requirements for printing process water, and can effectively reduce the wastewater discharge amount.

Description

technical field [0001] The invention relates to a reverse osmosis membrane treatment system for advanced treatment of printing and dyeing wastewater, which is particularly suitable for treating printing and dyeing wastewater with high requirements on the quality and quantity of reused water. Background technique [0002] With the rapid development of the textile printing and dyeing industry, the production capacity and output continue to grow. The "Twelfth Five-Year Plan" of the printing and dyeing industry requires that by 2015, printing and dyeing enterprises above designated size will have a printing and dyeing cloth factory of 69.5 billion meters, an annual increase of 3%; the total industrial output value will be completed 534.6 billion yuan, with an average annual increase of 12%; total exports of 19 billion US dollars, with an average annual increase of 8%, and the energy consumption per unit of industrial added value in the printing and dyeing industry has further dec...

AI Technical Summary

Problems solved by technology

However, the high-pressure pipeline is complicated, and the cost of 304 pipeline and welding accounts for a large proportion in the processing of the entire reverse osmosis membrane frame, and it is troublesome to make large adjustments to the on-site recovery rate.

The results of the operation found that the pollution distribution of the first and second sections of the membrane is uneven, and the membrane needs to be washed in sections, and the on-site membrane washing needs to be washed many times. Washing, after the second-stage fouling, technicians also have to go to the site to wash the membrane, usually together with the first stage, resulting in a waste of chemicals and personnel.

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