Carbon dioxide gas floatation treatment system for coal chemical industrial wastewater

Abstract

The invention discloses a carbon dioxide gas floatation treatment system for coal chemical industrial wastewater. The carbon dioxide gas floatation treatment system for coal chemical industrial wastewater comprises a conditioner and a gas floatation device, wherein the conditioner takes carbon dioxide as a gas source; and the gas floatation device is connected with the conditioner by a pipeline. According to the invention, by taking original waste carbon dioxide as a gas source, after the carbon dioxide is dissolved in water, wastewater is converted into acidic wastewater, and the PH value of the wastewater is adjusted, so that the original alkali wastewater is converted into acidic wastewater, thereby greatly improving the separation effect of subsequent gas flotation; and because carbon dioxide is taken as a gas source, the increasing of a COD value and the occurrence of bubbles caused by the fact that air as an air source easily oxidizes organic pollutants in wastewater, are avoided, so that the biodegradability of the wastewater is reduced. Because carbon dioxide is difficult to be dissolved in water, the gas source increases the pressure, and a disc-type jet aerator (a patent of our company) is applied for increasing a mixed contact surface, so that an effect of increasing the solubility is achieved, therefore, the carbon dioxide gas floatation treatment system for coal chemical industrial wastewater disclosed by the invention effectively improves the removal rate of oil materials in wastewater, and the introduction of other harmful ions is avoided.

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...

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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

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