Fluoride Removal from Industrial Wastewater Using Advanced Chemical Precipitation and Filtration 3 December 2019 Key Takeaways: Microelectronics production generates wastewater with elevated levels of fluoride often requiring treatment before discharge. Fluoride removal is practiced in drinking water via adsorption, ion-exchange and/or reverse osmosis. These technologies should also be considered for industrial wastewater treatment but are generally better fit for low concentrations of fluoride. Calcium fluoride precipitation and coagulation is another option to remove fluoride from industrial wastewater to meet discharge requirements. This is suited for the much higher fluoride concentrations typically associated with microelectronics industry. New modular, intelligent, and
Water Solutions for the Semiconductor Industry
The manufacturing of microelectronics generates unique wastewaters. Saltworks can help you to manage wastewater flows from microelectronics production, targeting ammonia, metals, and ions for removal, reducing brine waste, and allowing water reuse.
Microelectronics and Water
High purity water for washing and etching processes is essential to the production of microelectronics. The wastewater produced often contains both organic solvents and inorganic contaminants. Saltworks can help with these challenges, including:
- Reducing ammonia loads in biological processes & optimizing stripper scrubbers
- Precipitating fluoride from etching wastewater.
- Reducing particulate to a low level using robust, ceramic ultrafiltration.
- Selectively precipitating metals for removal in a compact plant with intelligent automation.
- Brine Management such as recovering water from reverse osmosis brine and ion exchange resin regeneration waste.
The silicon microelectronics industry uses hydrofluoric acid etching, producing fluoride-rich wastewater. Chemical precipitation and coagulation are used to treat fluoride.
Saltworks’ BrineRefine robotizes chemical softening to improve operations while reducing footprint. BrineRefine uses intelligent automation—with optional ion-specific sensors—to dose chemicals precisely, accepting variability on the inlet flow: reducing chemical and sludge disposal costs.
XtremeUF, our robust ceramic ultrafiltration system, removes precipitate and other particulate, producing a high quality filtrate in a small footprint. Clarifiers can also be partnered with BrineRefine.
Heavy metals such as arsenic (As), nickel (Ni), and cobalt (Co) can also be removed with our BrineRefine solution. Production of amorphous solids from these processes requires a high rate of slurry thickening and pressing to ensure sound water recovery and economics.
BrineRefine’s built-in XtremeUF system can concentrate slurries to the extreme, reducing the load on filter presses and operators, thereby reducing costs. 100% water recovery can be achieved, with the only waste being a minimized solid filter cake.
See our IonSelect solutions to learn more about our selective contaminant removal solutions.
Biological treatment and/or stripper scrubbers are widely used in ammonia wastewater treatment. Biological treatment can produce harmless nitrogen gas, while stripper scrubbers manufacture a rich ammonium sulfate solution, which can be blended into fertilizer. Ammonia presents unique challenges with many pathways to its removal. Treatment choices are largely determined by the economics of the ammonia post-removal (destruction, reuse, transport).
Saltworks can facilitate or optimize treatments by:
- Reviewing your ammonia problem and developing a matrix of comparative options, including costs
- Concentrating ammonia wastewaters with XtremeRO
- End-to-end ammonia strip, scrub, & crystallize solutions
- Boosting stripper-scrubber capacity by extracting ammonia from the scrubber circuit, increasing absorption capacity
- Crystalizing ammonium sulfate using our SaltMaker evaporative crystallizers
- Removing ammonia load through novel processes using off-the-shelf unit operations specific to your water
- Converting to nitrogen gas via chemical or electrochemical methods
Saltworks’ brine management solutions can produce clean water from reverse osmosis brines, ion exchange regeneration wastes, and other concentrated saline waters. Our experts can help you to understand your brine minimization options, and the costs involved in taking each incremental step.
After membrane system recovery has been optimized, our thermal desalination solutions from the SaltMaker family of modular, fully packaged industrial evaporator-crystallizers can help you to achieve minimal (MLD) or zero liquid discharge (ZLD). Wasteheat driven options are available.
Contact us to learn more about our solutions for microelectronics wastewaters.
Extended Article: Fluoride Removal from Industrial Wastewater Using Advanced Chemical Precipitation and Filtration
Our experts’ in-depth review of treatment options and how Saltworks can help
Microelectronics Related Products
BrineRefine Chemical Softening System
Smart, compact, modular chemical softening system that reduces costs with precision dosing and built-in solids management. Improves recovery and minimizes fouling risk with intelligent controls that communicate with downstream assets, like RO or evaporators.Learn More …
An ultra-robust ceramic based ultrafilter that can remove suspended solids, oils, and grease from the most challenging slurries and impacted wastewaters. XtremeUF cleans itself as it operates, to ensure your membranes maintain performance.
Next-generation water-maker and brine-concentrator based on reverse osmosis that achieves extreme freshwater recoveries, enabling cost-effective brine management and treatment of challenging organic-laden waters including oil & gas produced waters.
The first evaporator-crystallizer with no atmospheric contact, important for water with volatile organics. Choose between no liquid water return or clean water that is safe for discharge.
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