A carbon dioxide flotation treatment system for coal chemical wastewater

Abstract

The invention discloses a carbon dioxide air flotation treatment system for coal chemical wastewater. The carbon dioxide air flotation treatment system for coal chemical wastewater includes: a conditioning tower and an air flotation device; a conditioning tower, and the conditioning tower uses carbon dioxide as a gas source; Floatation device, the air flotation device is connected to the conditioning tower through pipelines; the present invention uses the original waste carbon dioxide as the gas source, and uses carbon dioxide dissolved in water to form acidity in the conditioning tower to adjust the pH value of the waste water so that the original Alkaline wastewater is converted into acid, which greatly improves the separation effect of subsequent air flotation; at the same time, carbon dioxide is used as the gas source to avoid the COD value increase and foam generation caused by the organic pollutants in the easily oxidized wastewater when air is used as the gas source. The biodegradability of wastewater is reduced; because carbon dioxide is difficult to dissolve in water, our air source increases the pressure (Venturi), and at the same time, the disc jet aerator (patented by our company) is used to increase the mixing contact surface to achieve the effect of improving solubility ; Therefore, a carbon dioxide flotation treatment system for coal chemical wastewater of the present invention effectively improves the removal rate of oily substances in wastewater, and avoids the introduction of other harmful ions.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a carbon dioxide gas flotation treatment system for coal chemical wastewater. Background technique [0002] The composition of coal chemical wastewater is very complex, containing a large amount of oil, suspended solids and high concentrations of toxic and harmful compounds. It is a typical industrial wastewater that is difficult to biodegrade. There are many kinds of organic pollutants in wastewater. In addition to toxic and harmful substances such as phenolic compounds, polycyclic aromatic hydrocarbons, carbazole, naphthalene, pyrrole, furan, biphenyl, oil, etc., there are also many inorganic pollutants such as ammonia nitrogen and sulfide, etc. Wastewater The COD value and chromaticity are both high, and the biodegradability is very poor. If it is not handled properly, it will seriously pollute the environment. [0003] The treatment of such coal chemical wastewa...

AI Technical Summary

Problems solved by technology

[0004] Nowadays, the traditional air flotation method is used for degreasing wastewater, and the traditional air flotation uses air as the air source, and there are many places to be improved: (1) Air is the air source for air flotation, and the oxygen in the air can oxidize the organic matter in the wastewater, resulting in The COD value increases, and the biodegradability of wastewater decreases; (2) Coal chemical wastewater is alkaline wastewater. In order to improve the air flotation oil removal rate, it is necessary to add acid to adjust the pH<6, which not only increases the cost but also introduces additional harmful ions; ( 3) The traditional air flotation treatment of coal chemical wastewater will produce a lot of foam, which will affect the normal operation of the air flotation device in severe cases

Images