Device for treating alkaliferous waste water through nanofiltration

Abstract

The invention discloses a device for treating alkaliferous waste water through nanofiltration and relates to the field of waste water treatment. The device comprises a water storage tank, wherein a pump is connected with a pretreatment pool; the pretreatment pool is connected with a backflow pool; a valve is arranged between the pretreatment pool and the backflow pool; the backflow pool is connected with the pump through the valve and is connected to a nanofiltration device; a drainage port of the nanofiltration device is connected with a pure water tank; concentrated liquid outlets are respectively connected with the backflow pool through the valve; the nanofiltration device is formed in a way that an upper cover with a pressure gauge and a liquid inlet is connected with a nanofiltration tank body through a flange; a water distributor with a water distribution hole is arranged at a lower end of the upper cover; a nanofiltration film is formed on the water distribution hole; the other end of the nanofiltration film is connected to a water collection hole of a water collector at the bottom of the tank body; the water collection hole is connected with an outlet at the bottom end of the tank body; and a water outlet is also arranged on the upper end of the tank body. With the adoption of the device, the environment pollution to alkaliferous waste water in the industrial production is solved, the alkali in the waste water is recovered, and the phenomena that the cost is increased and the resources are wasted because a large amount of sulfuric acid or hydrochloric acid needs to be consumed when alkaliferous waste water is treated by neutralizational process can be avoided.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a nanofiltration device for treating alkali-containing waste water. Background technique [0002] At present, in papermaking, petrochemical and other industries, a large amount of alkali-containing waste water is produced every day, which is not only a kind of pollution to the environment, but also a kind of waste, but the treatment of alkali-containing waste water is very inconvenient and the effect is not satisfactory. People are satisfied. For example, in the alkali reduction wastewater and mercerizing wastewater of printing and dyeing factories, some manufacturers adopt the evaporation concentration method to recover alkali, but the effect is not very satisfactory, and the discharged water after treatment is still alkaline. This method cannot solve the fundamental problem of alkali-containing wastewater. At the same time, It is very inconvenient to do, so some manufactur...

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Problems solved by technology

[0002] At present, in papermaking, petrochemical and other industries, a large amount of alkali-containing waste water is produced every day, which is not only a kind of pollution to the environment, but also a kind of waste, but the treatment of alkali-containing waste water is very inconvenient and the effect is not satisfactory. people are satisfied

For example, in the alkali reduction wastewater and mercerizing wastewater of printing and dyeing factories, some manufacturers adopt the evaporation concentration method to recover alkali, but the effect is not very satisfactory, and the discharged water after treatment is still alkaline. This method cannot solve the fundamental problem of alkali-containing wastewater. At the same time, It is very inconvenient to do, so some manufacturers do not recycle at all, but use acid for neutralization treatment. When treating alkaline wastewater by neutralization method, a large amount of sulfuric acid or hydrochloric acid needs to be consumed. After neutralization, the wastewater can be further biochemically treated. This kind of treatment method is currently being used by most of the above-mentioned manufacturers. They throw away valuable alkali resources in vain, and they also need to invest a lot of acid, which brings increased operating costs to wastewater treatment, waste of resources, and poor water quality after treatment. ideal

At present, no matter whether it is the alkali-containing wastewater in the printing and dyeing industry or other industries, there is no effective treatment, and the alkali can be recycled. The alkali in the wastewater cannot be completely recovered. The discharged wastewater is alkaline, and the PH value of the alkaline wastewater If it exceeds 9.0, it will be excessive discharge. At present, many manufacturers are troubled by the lack of a good way to deal with alkali-containing wastewater.

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