The micro-nano bubble waste gas treatment technology is a technology that utilizes the special physical and chemical properties of micro-nano bubbles (bubbles with diameters between the micron and nano scales) to purify industrial waste gases, odorous gases, etc. Its principle can be elaborated from two aspects: the characteristics of micro-nano bubbles and the core process of waste gas treatment.

2. The core process of waste gas treatment

The micro-nano bubble waste gas treatment technology achieves purification through "gas - liquid contact". The specific process is as follows:

• Introduction of waste gas and mixing with bubbles
  The waste gas to be treated (such as containing VOCs, hydrogen sulfide, ammonia, dust, etc.) is introduced into the reaction device (such as a spray tower or a gas - liquid mixing tank). At the same time, throughMicro-nano bubble generatorWater or the treatment liquid is converted into a large number of micro-nano bubbles to form a "gas - liquid mixing system".

• Capture and dissolution of pollutants

• Particulate matter (such as dust) in the waste gas is adsorbed by the negative charges on the surface of micro-nano bubbles and sinks to the liquid with the bubbles, achieving dust removal;

• Soluble pollutants (such as ammonia and hydrogen sulfide) are dissolved into the liquid around the micro-nano bubbles through gas - liquid mass transfer and absorbed by the liquid (similar to the "water washing" process).

• Oxidation, decomposition and purification

• For insoluble organic pollutants (such as VOCs and benzene series), the hydroxyl radicals (・OH) generated when the micro-nano bubbles burst directly oxidize them into harmless substances (such as CO₂, H₂O);

• If an oxidation medium is added, the micro-nano bubbles can enhance the dispersibility and activity of the oxidant, further improving the oxidation efficiency;

• For acidic / alkaline pollutants, by adjusting the pH value of the liquid (such as using acidic liquid to absorb ammonia and alkaline liquid to absorb hydrogen sulfide), they can undergo a neutralization reaction in the liquid and be removed.

• Emission of purified gas
  After the above processes, the pollutants in the waste gas are absorbed, oxidized or neutralized. The purified gas (after meeting the standards) is discharged from the top of the device, and the pollutants in the liquid are removed through subsequent treatment (such as precipitation and biochemical treatment).

• Advantages: High - efficiency purification (especially for low - concentration and difficult - to - degrade pollutants), small footprint, no secondary pollution (most of the oxidation products of hydroxyl radicals are harmless substances), and the ability to treat particulate and gaseous pollutants simultaneously.

• Application scenarios: VOCs control in industries such as chemical engineering, printing and coating; treatment of odorous gases in sewage treatment plants and waste landfills; purification of industrial dust; treatment of laboratory waste gases, etc.