High Frequency (Beijing) Technology Co., Ltd.

Products & Services

Wastewater Collection and Treatment Systems

Our electronic-grade wastewater treatment technology efficiently and economically adapts to the specific characteristics of impurities through targeted processes. By integrating multi-stage chemical coagulation and sedimentation, ammonia nitrogen stripping, and biological treatment, chip manufacturing wastewater containing a wide range of pollutants with complex properties can be effectively treated, achieving deep pollutant removal. We are capable of handling over 15 types of chip wastewater, covering all potential wastewater types produced by advanced process lines, offering high treatment efficiency with low operating costs.

Products & Services

The production process of chips is kind of demanding, including cleaning silicon wafers, chemical vapor deposition, and etching, which are repeatedly carried out. During the process, a large number of chemical reagents and special gases are consumed, and manifold heavy metal ions come out, after being cleaned with UPW, turn into chip wastewater of complex composition. Compared to traditional industrial wastewater and urban sewage, chip wastewater contains more types of pollutants and components, making it more difficult to treat. With the rapid development of advanced chip processes, the concentration of pollutants such as chromium and nickel in chip wastewater is increasing, and special treatment is needed thus, promoting the continuous progress of wastewater treatment technology. Up to now, Gaopin Tech can deal with more than 15 types of chip wastewater, covering all types of wastewater that may be generated by advanced process production lines. The main technologies involved in typical wastewater treatment are as follows:

Treatment process	Technical key points
pH control	Control the dosing time and dosage based on the fluctuation of pH values to achieve precise dosing and improve the stability of wastewater pH.
Multi-stage chemical coagulation and precipitation	Make the particles in water fully react with reactants to precipitate and remove impurities that come with chip production and exist in wastewater, such as fluorine, copper, chromium, and nickel, and after the process, to maintain the total suspended solids (TSS) in the chip wastewater less than 20 ppm. In order to achieve the best effect of chemical coagulation and precipitation, reasonably adjust and control the type and dosage of chemicals, wastewater flow rate, stirrig method, precipitation pond shape, and other aspects.
Ammonia-nitrogen blowoff	Based on the theories of gas-liquid equilibrium and mass transfer velocity, air blow wastewater under alkaline conditions to maintain the concentration of ammonia in the gas always lower than the equilibrium concentration, which makes the dissolved ammonia in the wastewater continuously pass through the gas-liquid interface and ultimately removes NH_3-N from the wastewater. In order to improve the removal rate and achieve effective removal of ammonia and nitrogen in wastewater, strictly control parameters such as wastewater pH and temperature, gas-liquid ratio, and blowoff duration.
Biological treatment	Convert toxic substances into non-toxic substances through biochemical reactions within microorganisms, effectively decomposing toxic substances in chip wastewater. The difficulty of biological treatment technology lies in maintaining the cellular activity, reproduction, and metabolic efficiency of active bacterial communities, so it is necessary to control parameters such as pond shape, sludge concentration, microbial concentration, and oxygen content.

Logic chips	Memory chips	Power chips (MEMS/IGBT /MOS/LED)	Packaging testing	Next-gen semiconductors (GaAs/GaN/SiC)
Fluoric-containing wastewater system	Fluoric-containing wastewater system	Fluoric-containing wastewater system	cutting wastewater system	Fluoric-containing wastewater system
Grinding wastewater system	Grinding wastewater system	Grinding wastewater system	Back Grinding (BG) wastewater system	Grinding wastewater system
Copper-containing wastewater system	Copper-containing wastewater system	Copper-containing wastewater system	Nickel-zinc wastewater system	Ammonia nitrogen wastewater system
Ammonia nitrogen wastewater system	Ammonia nitrogen wastewater system	Ammonia nitrogen wastewater system	Copper-containing wastewater system	Organic wastewater system
Acid and alkali wastewater system	Acid and alkali wastewater system	Acid and alkali wastewater system	Tin-containing wastewater system	Acid and alkali wastewater system
	Organic wastewater system	Organic wastewater system	Nickel-containing wastewater system
	HF/IPA wastewater system	Arsenic-containing wastewater system	Chromium-containing wastewater system
	TMAH wastewater system		Gold-containing wastewater system
	BOE wastewater system		Palladium-containing wastewater system
	Recycled water system		Cyanide-containing wastewater system
			Organic wastewater system
			Recycled water system

UPW Distribution Systems

Reclaimed Water Systems

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