Method and system for pretreatment of cold-rolled leveling liquor wastewater

Abstract

The invention relates to a pretreatment method and system for cold rolling leveling liquid wastewater. The method comprises the following steps: introducing the leveling liquid wastewater into an adjustment pool; adjusting the pH value of the leveling liquid wastewater to below 6; adding a polymer coagulant for coagulation ;Choose 1‰ PAM as coagulant, the dosage is 5mg/L; Dissolved air flotation, remove grease and suspended solids, make the effluent CODcr≤10000mg/L; enter the biochemical treatment system adjustment tank, and mix with other oily wastewater ; The effluent CODcr≤2000mg/L of the regulating pool enters the contact oxidation system. The lower part of the adjustment tank of the system is connected to the pH adjustment tank through the lifting pump of the adjustment tank, the upper part of the pH adjustment tank is connected to the upper part of the coagulation tank, the upper part of the coagulation tank is connected to the upper part of the dissolved air flotation, and the upper part of the dissolved air flotation is connected to the middle the upper part of the pool. Compared with the traditional treatment method, the present invention occupies less area; the one-time investment is low, and the production operation cost is low; the treatment effect is stable, the operation is simple and convenient, and full-automatic control can be realized.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a pretreatment method and system for cold rolling leveling liquid waste water. Background technique [0002] In the cold-rolled strip steel processing line of the steel industry, in order to make the cold-rolled strip steel have higher flatness and smoothness, a leveling process is set up in the rolling process; the leveling process needs to use leveling liquid to achieve the effect of improving the leveling effect , The waste water produced in this process is called leveling liquid waste water. In recent years, with the further improvement of flatness and other indicators, this purpose is achieved by improving the quality of the leveling liquid during the rolling process, and the resulting leveling liquid wastewater has more stable chemical properties and is difficult to treat. [0003] The main component of the leveling liquid is a mixture of organic alcohol am...

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Problems solved by technology

[0005] However, the COD concentration of the effluent treated by this process is high, the fluctuation is large, and the effluent water quality is uncontrollable; and the equipment investment is large, and there are some disadvantages as follows:

[0007] 2. As an ultrafiltration device for the treatment of high-concentration oily wastewat

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