A company is mainly engaged in semiconductor processing, and the production period is accompanied by a large amount of wastewater.
The company is planning to add a new semiconductor production line, including chip preparation and chip packaging. Since the production line is running all day, a large amount of wastewater will be discharged every hour, which will have a huge impact on the sewage treatment station of the enterprise, so it is necessary to expand and renovate its own sewage treatment station.
Semiconductor industrial park, the picture comes from the network
Semiconductor wastewater will come from cleaning, lithography, etching, degumming, copper process, grinding and encapsulation and other processes, according to pollutants can be divided into fluorine-containing wastewater, acid and alkali wastewater, ammonia-containing wastewater, organic wastewater, metal-containing wastewater and so on. From so many wastewater classifications, it can be seen that there are many pollutants to consider when treating semiconductor wastewater, and more wastewater treatment processes will be adopted.
In accordance with our 15 years of practice in semiconductor wastewater treatment engineering, share a few treatment semiconductor wastewater treatment processes, if you like, you can like the attention, collection.
Semiconductor wastewater treatment process
Fluorinated wastewater is often treated using chemical precipitation
The use of lime, the fluorine ion and calcium ion form CaF2, the formation of insoluble salts precipitated in water, thereby reducing the content of these dissolved substances in the water. An appropriate amount of flocculant can be added to form calcium fluoride in the wastewater to form an alum flower that is easy to separate, thereby realizing the separation of fluoride ions in the wastewater.
The treatment of acid and alkali wastewater is often treated using the neutralization method
The acid-base wastewater is acid-base neutralized, and the pH of the solution is adjusted so that it is neutral or close to neutral, or suitable for the next step of treatment of the pH range.
Blow-off method is often used to treat ammonia-containing wastewater
The oxidation reaction with the dissolved gas in the water occurs when the air passes through the wastewater, so that the dissolved volatile substances in the water are transferred from the liquid phase to the gas phase, and the separated water treatment method is further blown off.
Organic wastewater is often treated by biological methods
Biological treatment method is to use microorganisms to degrade organic matter in water, which can be divided into aerobic treatment and anaerobic treatment according to the demand for oxygen by microorganisms. The advantages of this method are low operating costs, high removal rate of organic matter, and less energy consumed by the treatment process.
Metal-containing wastewater is often treated using the chemical precipitation method
Chemical precipitants (sulfides, hydroxides, etc.) are added to heavy metal wastewater, and heavy metals undergo chemical reactions to form insoluble compounds to form precipitates, and then the precipitate process is separated by filtration, centrifugation and other methods. However, the large amount of sludge generated during the treatment process needs to be properly treated.