Special resin for arsenic removal from LH-E-As semiconductor wastewater

In the field of semiconductor manufacturing, arsenic is a common impurity element. Its existence will not only seriously affect the performance and reliability of chips, but also pose a threat to the production environment and human health. By using high-efficiency arsenic removal resin, arsenic element in water can be effectively removed.

As the main raw material of semiconductor industry, arsenic, a toxic heavy metal element, is partially discharged into industrial wastewater as waste during processing and use. If these wastewater are directly discharged into the environment without treatment, it will pollute the natural environment and cause harm to animals, plants and human beings.

Performance and characteristics of a special resin for arsenic removal from LH-E-As semiconductor wastewater

1. Highly selective adsorption:

-It is highly selective for arsenic, and can preferentially adsorb arsenic ions in complex water environments. Even if there are many other ions, it can ensure the removal effect of arsenic. Its selective adsorption capacity can reach more than 95%, which can effectively separate arsenic from wastewater and greatly reduce the arsenic content of treated water quality.

2. Efficient arsenic removal ability:

-The total arsenic content of the water quality treated with this resin can be as low as less than 10ppb, which can meet industry standards and application scenarios with extremely strict requirements for arsenic content. It is an ideal technical means to improve the standard of arsenic-containing water bodies.

3. Good physical and chemical stability:

-In the process of treating complex water quality such as semiconductor wastewater, it can maintain the stability of its own structure and performance. It can withstand the effects of different temperatures, pressures and various chemicals that may be present in wastewater, ensuring long-term effective use and reducing replacement frequency and operating costs caused by unstable resin properties.

4. Large adsorption capacity:

-It has high arsenic adsorption capacity, can treat a large amount of arsenic-containing wastewater, reduce the use of resin and the floor space of equipment, and improve treatment efficiency and economic benefits.

5. Easy to regenerate:

-The resin can restore the adsorption capacity through specific regeneration methods, thus enabling reuse, reducing operating costs and waste generation. The regeneration process is relatively simple and easy to operate, which can ensure the performance stability of the resin during long-term use.

6. Wide application fields:

-In addition to semiconductor wastewater treatment, LH-E-As resin is also widely used in chemical industry, food, drinking water treatment and other fields that have strict requirements for arsenic content.

General process flow of LH-E-As resin for arsenic removal from semiconductor wastewater:

1. Wastewater collection and pretreatment:

-Classified collection: Arsenic-containing wastewater generated in the semiconductor production process and other types of wastewater are classified and collected for subsequent targeted treatment.

-Physical pretreatment: Remove larger solid particles, suspended solids and other impurities in wastewater through grilles, screens and other equipment to prevent them from causing blockage or damage to subsequent treatment equipment and resins. Then sedimentation is carried out, so that some large particles of material naturally settle to the bottom of the sedimentation tank, removing some solid particles and sediment, and reducing the load of subsequent treatment.

2. Water quality regulation:

-pH adjustment: The pH value of the wastewater is detected and the pH value of the wastewater is adjusted to a suitable range using acids or bases according to the applicable conditions of the resin and the needs of subsequent treatment. For example, in some cases, it may be necessary to adjust the pH to neutral or near neutral to ensure the adsorption effect and stability of the resin.

-Temperature regulation: If the temperature of the wastewater is too high or too low, it may affect the adsorption performance and service life of the resin. Therefore, it is necessary to adjust the temperature of the wastewater to a temperature range in which the resin can work properly by heating or cooling.

3. Resin adsorption:

-Resin packing: LH-E-As resin is packed into equipment such as ion exchange column or adsorption tower. During the filling process, it is necessary to ensure that the resin is filled evenly and tightly to avoid voids or uneven accumulation of resin to ensure that the wastewater can fully contact the resin.

-Wastewater passing through resin: The pretreated and water quality adjusted wastewater is passed through an ion exchange column or adsorption column packed with resin at a certain flow rate. The arsenic ions in the wastewater undergo an ion exchange reaction with the active groups on the resin, and the arsenic ions are adsorbed onto the resin, while the treated water flows out of the column or column.

4. Resin regeneration:

-Regenerant selection: When the resin adsorption is saturated, the resin needs to be regenerated. Commonly used regenerants are sodium chloride solution, etc. The concentration and dosage of regenerant need to be selected and adjusted according to the type of resin, adsorption capacity and actual operating conditions.

-Regeneration process: A certain concentration of regenerant is passed through the adsorbed saturated resin in the opposite direction, so that the arsenic ions adsorbed on the resin are desorbed, and the adsorption capacity of the resin is restored at the same time. The arsenic-containing regeneration liquid produced during the regeneration process needs to be collected and further processed to prevent secondary pollution.

5. Subsequent processing:

-Wastewater testing: Test the wastewater after resin treatment to ensure that the arsenic content in it meets the national or local discharge standards. If the arsenic content still exceeds the standard, the wastewater needs to be further treated or re-treated with resin adsorption.

-Standard discharge or reuse: If the wastewater is tested qualified, it can be discharged into the environment or reused. If it is reused in the semiconductor production process, the water quality needs to be further treated and purified according to the requirements of the production process.