Unlocking Semiconductor Wastewater Bottlenecks: How SINOKLE’s CDFU, CDOF, and KFM Systems Solve Complex Fluorine, Phosphorus, and Copper Challenges
Addressing the industry pain points of semiconductor wastewater where "fluorine, phosphorus, copper, and high ammonia nitrogen" coexist, and complexed pollutants are highly difficult to treat, the CDFU, CDOF, and KFM equipment from Shenzhen Clear Science & Technology Co., Ltd (SINOKLE), though focused on physical separation and advanced oxidation, possess a highly applicable technical mechanism for breaking pretreatment bottlenecks and enhancing resource recovery. They can serve as the core units of a "pretreatment + advanced oxidation" process, seamlessly integrating with downstream sedimentation and biochemical systems.
1. Fluorine- and Phosphorus-Containing Wastewater
High concentrations of fluoride ions and phosphate radicals in semiconductor wastewater are typically removed by adding calcium or aluminum salts to form calcium fluoride or calcium phosphate precipitates. However, in actual operation, the generated micro-precipitates (often with particle sizes < 10μm) settle slowly, leading to effluent suspended solids (SS) exceeding standards.
SINOKLE's CDFU (Cyclone Dissolved Gas Flotation) unit can play a critical role in this stage. By utilizing the micro-bubbles (5-30μm) it generates, the system can highly efficiently "float" these hard-to-settle fluorine- and phosphorus-containing flocs to the water surface, replacing traditional, time-consuming gravity sedimentation tanks.
The KFM Activated Media Filter can then serve as a polishing unit to further intercept any escaping micro-particles. This combination can shorten the hydraulic retention time of conventional sedimentation processes from several hours to just tens of minutes, directly solving the common "turbidity carryover" issue in fluorine-containing wastewater treatment and ensuring that effluent fluoride ions stably meet discharge standards.
2. Copper- and Heavy Metal-Containing Wastewater
In semiconductor chemical mechanical polishing (CMP) or electroplating wastewater, copper ions frequently form extremely stable soluble complexes with EDTA, citric acid, or ammonia. Traditional alkali precipitation cannot directly remove complexed copper, which represents a major technical challenge in the industry.
SINOKLE's CDOF equipment (Integrated Cyclone Ozone Flotation Unit) generates hydroxyl radicals (·OH) with high oxidation potential, which can directionally attack and break the molecular chains of organic complexing agents such as EDTA. CDOF holds a unique advantage in removing chemically complexed heavy metals like copper and nickel, transforming difficult-to-treat complexed heavy metals into free ions that are easy to precipitate.
CDOF performs advanced oxidation in a purely physical manner. Compared to adding chemicals like sodium sulfide, it avoids secondary pollution and the generation of toxic gases. Furthermore, its ozone utilization rate is > 99%, resulting in lower operational costs.
3. High Ammonia Nitrogen Wastewater
High ammonia nitrogen wastewater primarily originates from photolithography and development processes (containing tetramethylammonium hydroxide, or TMAH) as well as etching and cleaning processes.
Although the ozone catalytic oxidation process of CDOF cannot directly convert large amounts of ammonia nitrogen into nitrogen gas, it can oxidize and decompose organic amines such as TMAH to release ammonia nitrogen, thereby significantly enhancing the treatment efficiency of the downstream biochemical system. For wastewater that still contains low levels of ammonia nitrogen after biochemical treatment, CDOF can also serve as a final polishing stage, utilizing the selective oxidation of hydroxyl radicals to directly oxidize ammonia nitrogen into nitrogen gas, achieving advanced nitrogen removal.
This technology exhibits significant advantages in handling highly difficult organic nitrogen conversion and possesses strong resistance to shock loads.
4. Suggested Synergistic Process Chain
It is recommended to adopt a combined process flow of: Equalization/Regulation → CDOF (Complex Breaking/Chain Scission) → Chemical Precipitation (Fluorine/Phosphorus/Heavy Metal Removal) → CDFU + KFM (High-Efficiency Solid-Liquid Separation & Polishing Filtration) → Biochemical System (Nitrogen Removal).
By utilizing CDOF in the first step to resolve organic complexation issues, ideal conditions are created for subsequent chemical precipitation. Utilizing the high-efficiency separation capability of CDFU guarantees the water quality of the sedimentation effluent. Ultimately, this ensures the biochemical system specialized in ammonia nitrogen treatment operates within an optimal environment.
5. Conclusion
While SINOKLE's equipment is not a "panacea" for semiconductor wastewater treatment, these units serve as critical links that unlock complex wastewater treatment processes. For fluorine-, phosphorus-, and copper-containing wastewater, CDFU and KFM solve the problem of "difficult separation." For heavy metal complexes and high ammonia nitrogen wastewater, CDOF solves the problems of "difficult degradation" and "difficult conversion." Their characteristics of "zero chemical dosing, high efficiency, and small footprint" perfectly align with the long-term trends of clean production and resource recovery in the semiconductor industry.