AOX refers to organic halogen compounds contained in water that can be adsorbed by adsorption materials such as activated carbon. They usually come from by-products of chemical synthesis processes, such as the production of chlorinated organic compounds, pulp bleaching processes, and wastewater discharge from industries such as pesticide manufacturing. Due to the toxicity of these organic halogen compounds to the environment and their difficulty in biodegradation, the removal of AOX has become an important issue in the field of water treatment.AOX pre-processing equipmentMainly used to remove AOX components from wastewater through physical, chemical, or biochemical methods, thereby reducing water pollution.

1、 Working principle

The working principle of AOX pre-processing equipment mainly relies on the following methods:

1. Adsorption method

Adsorption method is one of the common techniques, usually using activated carbon or other high surface area adsorption materials to adsorb organic halogens in wastewater. Activated carbon has strong adsorption properties and can effectively remove organic pollutants, including AOX, from water. After entering the equipment, the wastewater comes into contact with the adsorbent, and the organic halogen compounds are adsorbed on the surface of the adsorbent material, thereby achieving the removal of AOX.

3. Chemical reduction method

The chemical reduction method mainly converts organic halogen compounds into halogen-free organic compounds or harmless substances through reduction reactions. This method often uses reducing agents such as sulfite and ferrous salts to degrade AOX into harmless substances under certain reaction conditions. The advantage of chemical reduction method is that it has a fast processing speed and can effectively degrade high concentrations of AOX, but its disadvantage is that it requires the addition of reducing agents and the waste generated during the treatment process needs to be further disposed of.

4. Oxidation method

The oxidation method utilizes strong oxidants to oxidize organic halogen compounds in wastewater into harmless substances. The principle of oxidation method is to react the halogens in AOX with other chemical components through oxidation reaction, forming substances that are harmless to the environment. The advantage of oxidation method is that it can remove AOX in a short time and has a wide range of applications, but its disadvantage is that it requires a large amount of oxidant and may generate secondary pollution.

2、 Technical analysis

1. Considerations for technology selection

When choosing AOX pre-treatment equipment, factors such as wastewater properties, AOX concentration, treatment water volume, and equipment operating costs need to be considered. For high concentration AOX wastewater, strong removal techniques such as adsorption or oxidation are usually required, while for low concentration wastewater, more economical techniques such as chemical reduction or biological treatment can be chosen.

2. Applicability of equipment

The application varies in different industrial fields. In industries such as chemistry, papermaking, and pesticides, AOX components are usually complex and have high concentrations, so multiple treatment methods need to be used in combination. For urban sewage treatment plants, the concentration of AOX is usually lower, and more convenient treatment methods can be used.

3. System Integration and Automation

With the continuous development of intelligent technology, it is gradually moving towards automation and integration. The equipment not only has the functions of automatic monitoring, alarm, and automated operation, but also can monitor and adjust the operating status in real time through an intelligent system, thereby improving processing efficiency and reducing labor costs. The application of automation systems makes the operation of equipment more stable and avoids errors caused by human operation.

AOX pre-treatment equipment plays a crucial role in wastewater treatment, effectively removing organic halogen compounds from wastewater and reducing environmental pollution through technologies such as adsorption, chemical reduction, oxidation, membrane separation, and biological treatment. Choosing appropriate equipment and treatment methods can not only improve the efficiency of wastewater treatment, but also reduce treatment costs and enhance the environmental performance of enterprises.