Application of air flotation machine in printing and dyeing wastewater treatment project

It is understood that the water quality of printing and dyeing wastewater is characterized by high concentration of organic matter and suspended solids, heavy color, easy corruption, and low toxicity. In addition, there are a large number of harmful dyes in the wastewater. Without scientific and effective treatment, printing and dyeing wastewater will cause eutrophication, consume a large amount of dissolved oxygen in the water, and lead to the death of aquatic organisms.

At present, printing and dyeing wastewater is usually treated by anaerobic, aerobic, anaerobic-aerobic and other water treatment methods. These methods reduce CODcr and BOD5 in varying degrees, but the treatment effect of dyes is not good. In view of the fact that the dye content in the production wastewater of printing and dyeing enterprises is high, we recommend that the air flotation method be used to pretreat the printing and dyeing industrial wastewater, and most of the dyes and suspended solids in the wastewater are removed before aerobic biochemical treatment, so as to ensure that the printing and dyeing industrial wastewater after treatment meets the requirements of the discharge standard.

Dissolved air floatation is a very common wastewater treatment method, which can effectively and rapidly realize solid-liquid separation. The working principle of the dissolved air flotation machine is to use the air flotation machine and other equipment to generate a large number of highly dispersed micro-bubbles in the water, and use the bubbles as the carrier to adhere the suspended solids in the wastewater, and then form an adhesive body to float to the water surface, and finally remove the scum on the water surface through the equipment, thus removing the impurities in the sewage. Air flotation can realize the separation of solid and liquid, solid and solid, liquid and liquid, and even ions in solute.

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