Air flotation device for cleaning floating object in sewage in printing and dyeing mill

Abstract

The invention discloses an air flotation device for cleaning floating objects in sewage in a printing and dyeing mill, which belongs to sewage treatment equipment. The air flotation device is an air flotation device for cleaning floating objects in an on-line sewage treatment system. The air flotation device comprises a water tank of which the upper end opening takes the shape of a square, wherein at least three air inlets are formed in the lower part of a side wall of the water tank; a guide plate is arranged inside the water tank; the water tank is partitioned into a sewage area and a clean water area by the guide plate; at least one water collection tube is arranged in the clean water area; a sewage collecting tank and a floating object drainage hole are formed in the outer side of the side wall of the water tank with the air inlets; a water collecting chamber and a clean water outlet are formed in the outer side of the side wall of the water tank opposite to the sewage collecting tank; the water collecting tube is communicated with the water collecting chamber through the water outlet; a scraping device is arranged in match at the upper end of the water tank through a track. By adopting the device, the pretreatment sewage emission is approximate to zero, so that not only is the expense for sewage treatment of companies reduced, but also the increase of COD content due to the fact that the pretreatment wastewater is directly discharged to a sewage treatment system is reduced.

Description

technical field [0001] The invention belongs to sewage treatment equipment, in particular to an air flotation device for removing floating objects in an online sewage treatment system. Background technique [0002] At present, printing and dyeing enterprises use a large amount of water every day and produce a large amount of sewage. With the development of industrialization, water resources are becoming more and more precious, and the large amount of sewage generated needs expensive purification treatment; products such as clothing fabrics and bedding and other pure cotton 1. Polyester-cotton printing and dyeing enterprises mainly use water machines such as desizing machines, bleaching machines, mercerizing machines, and washing machines. At present, the sewage after use of these equipments is transported to a large sewage treatment system for treatment and then discharged; The continuous operation of each equipment will generate a large amount of wastewater, and centralized...

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Problems solved by technology

[0002] At present, printing and dyeing enterprises use a large amount of water every day and produce a large amount of sewage. With the development of industrialization, water resources are becoming more and more precious, and the large amount of sewage generated needs expensive purification treatment; products such as clothing fabrics and bedding and other pure cotton 1. Polyester-cotton printing and dyeing enterprises mainly use water machines such as desizing machines, bleaching machines, mercerizing machines, and washing machines. At present, the sewage after use of these equipments is transported to a large sewage treatment system for treatment and then discharged; The continuous operation of each equipment will generate a large amount of wastewater, and centralized treatment will also consume a lot of production costs; the composition of water produced by different processes is different, but the front-end treatment of most processes does not contain dyes because of the intervention of dyes. Dyes can be reused. The existing technology cannot solve the problem of on-line reclaimed water treatment and reuse. The sewage pre-treated by the above-mentioned equipment is mainly sweaters, dust, organic impurities, and PVA slurry, that is, these sewages contain more than 90% of Floatables, so only need to clear these floatables, and it can be reused

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