Horizontal and efficient flotation separation system for sewage air floatation treatment

Abstract

The present invention provides a horizontal and efficient flotation separation system for sewage air floatation treatment. The system includes an air flotation tank, a baffle structure and an efficient oil collection device; the inside of the air flotation tank is divided into several stages of mixing separation zones and clear water zones, which are arranged along the fluid flow direction; each stage of the mixing separation zone is separated by baffle structure; the zone between an upper baffle and a lower baffle is a gas-water mixing zone; the bottom of the gas-water mixing zone is provided with a dissolved gas and water release device connected with a micro-bubble dissolved gas and water generator; a zone between the lower baffle and an upper baffle of a next level of mixing separation zone is a settlement separation zone; the last stage of settlement separation zone is provided with a corrugated plate packing; the efficient oil collection device is disposed over the baffle structure; and the clear water zone is provided with an oil collection tank. The present invention has the advantages of improving gas-water contact mixture efficiency and clear water separation after contact, improving the separation efficiency of a stability chamber, reducing equipment size and energy consumption, and reaching high system stability and of low-cost maintenance.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a high-efficiency flotation separation system for horizontal sewage air flotation treatment. Background technique [0002] At present, the air flotation method is mostly used to treat oily wastewater. The air flotation water treatment process is to try to generate a sufficient number of fine air bubbles of uniform size in the raw water, and to make the oil particles, suspended solids (SS) and other pollutants in the raw water and air bubbles Adhesion occurs, and then rises to the water surface with the help of buoyancy, and achieves the purpose of water purification by collecting foam scum. Since this method has gradually gained people's attention and has also been greatly developed in recent years, a variety of air flotation technologies have emerged, and the horizontal sewage air flotation technology is one of them. However, the existing horizontal air flotation technol...

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Problems solved by technology

Since this method has gradually gained people's attention and has also been greatly developed in recent years, a variety of air flotation technologies have emerged, and the horizontal sewage air flotation technology is one of them. However, the existing horizontal air flotation technology has the following problems : 1. After air-water mixing, no separation area is designed separately, but the same space is used for air-water contact and separation. Since the migration direction of air-water contact is the same, it is easy to cause the phenomenon of liquid surface tumbling, which not only affects the relationship between air bubbles and water phase Full mixing will also affect the effect of gas-water separation, causing the oil particles and suspended solids that have been floated to be brought into the next gas-water mixing zone; 2. After multi-stage gas-water mixing and separation, the final stage of separation ( or stability chamber), there is no efficient measure to separate the design of relatively small particle size substances; 3. Oil collection grooves are mostly designed on both radial sides of the air flotation equipment, and the oil collection effect is not good; or use scrapers to assist oil collection , which increases energy-consuming equipment and maintenance costs; 4. It is rare to use high-efficiency micro-bubble generating devices

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