Chemical precipitation at extreme fluoride concentration and potential recovery of CaF2 particles by fluidized-bed homogenous crystallization process

Lacson, Carl Francis Z.; Lu, Ming‐Chun; Huang, Yao-Hui

doi:10.1016/j.cej.2021.128917

Cited by 49 publications

(16 citation statements)

References 66 publications

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“…Na 2 CO 3 and NaOH were used for carbonate and hydroxide precipitant precursors, respectively, to determine the effect of precipitants on the treatment of single-and co-contaminated streams. The mixture was stirred at 100 rpm for 10 min then 30 rpm for 50 min as adapted from the literature [19], and finally kept for settling to draw liquid sample for residual cobalt and copper analysis. For the cobalt and copper residue, the supernatant liquid was filtered with 0.22 μm syringe filter and digested with 1 mL HNO 3 (70%) to stop precipitation.…”

Section: Batch Experimentsmentioning

confidence: 99%

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Recovery of cobalt and copper from single- and co-contaminated simulated electroplating wastewater via carbonate and hydroxide precipitation

Quiton

Huang

2022

Sustain Environ Res

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Wastewater containing cobalt and copper comprised of plating wash water, plant wash water, and equipment cooling and wash water is generated in the electroplating industry. These metals can be detrimental to humans, animals, plants, and the environment. Thus, it is necessary to treat electroplating wastewater to remove these toxic metals. Carbonate and hydroxide precipitation were utilized for the removal of Co (II) and Cu (II) from synthetic electroplating wastewater by jar tests in this work. The effects of solution pH, precipitant-to-metal ratio, and type of precipitant on the precipitation efficiency of cobalt and copper from the single- and co-contaminated systems were investigated. Carbonate precipitation achieved higher removal efficiency for both target metals in the single- and co-contaminated wastewater streams. Furthermore, it can operate at relatively low pH range of about 7–8. Cobalt in both pollutant systems was almost completely removed at pH 10 using both precipitant systems. Copper was found to be easily removed which was possibly brought about by precipitation-adsorption mechanism. The extent of the co-removal of cobalt with copper is significantly pH dependent. The effect of precipitant-to-metal ratio for cobalt and copper treatment varied in single- and co-contaminated streams. Carbonate precipitation led to higher sludge volume than that of hydroxide precipitation.

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Section: Batch Experimentsmentioning

confidence: 99%

“…Soluble copper hydro complexes are formed at low and high pH range in pure water and given by the reactions below depicted as Eqs. ( 16) to (19). In the presence of anionic ligands, these complexes form precipitates such as Cu(OH) 2 , CuCO 3 , etc.…”

Section: Copper Speciationmentioning

confidence: 99%

Recovery of cobalt and copper from single- and co-contaminated simulated electroplating wastewater via carbonate and hydroxide precipitation

Quiton

Huang

2022

Sustain Environ Res

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“… 7 The concentration of this hazardous heavy metal must therefore be eliminated or reduced in the aquatic environment. Several treatment methods, including adsorption, membrane separation, 8 coagulation–flocculation, 9 osmosis, 10 and chemical precipitation 11 have been used to get rid of harmful metal ions. Adsorption is a common treatment method because it is affordable, easy to use, and especially environmentally friendly.…”

Section: Introductionmentioning

confidence: 99%

Hybrid carbonaceous adsorbents based on clay and cellulose for cadmium recovery from aqueous solution

et al. 2023

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“…For the semiconductor industry, large amounts of fluoride-rich and silica-rich wastewaters are discharged. The fluoride-rich wastewater with a high fluoride concentration (e.g., 1–50 g L –1 ) causes severe crises for human health, − while the fluoride emission discharge is limited to a median value of 15 mg L –1 . , Silica is a typical waste in silica-rich wastewater . The high concentration of nanosized silica particles (around 2.6 g L –1 SiO 2 ) in wastewater causes environmental issues such as the production of hazardous oxyradicals. − Traditionally, the treatment methods such as precipitation and coagulation–flocculation are applied to treat the fluoride and silica in semiconductor wastewaters separately. , However, the waste solid (e.g., calcium fluoride and silica slurry) generation will cause secondary pollution to the environment.…”

Section: Introductionmentioning

confidence: 99%

“…The fluoriderich wastewater with a high fluoride concentration (e.g., 1−50 g L −1 ) causes severe crises for human health, 7−9 while the fluoride emission discharge is limited to a median value of 15 mg L −1 . 10,11 Silica is a typical waste in silica-rich wastewater. 12 The high concentration of nanosized silica particles (around 2.6 g L −1 SiO 2 ) in wastewater causes environmental issues such as the production of hazardous oxyradicals.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Fluoride-Rich and Silica-Rich Wastewaters as Valuable Resources: A Resource Capture Ultrafiltration–Bipolar Membrane Electrodialysis-Based Closed-Loop Process

Qiu

Ren

Xia

et al. 2022

Environ. Sci. Technol.

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Traditional technologies such as precipitation and coagulation have been adopted for fluoride-rich and silica-rich wastewater treatment, respectively, but waste solid generation and low wastewater processing efficiency are still the looming concern. Efficient resource recovery technologies for different wastewater treatments are scarce for environment and industry sustainability. Herein, a resource capture ultrafiltration–bipolar membrane electrodialysis (RCUF-BMED) system was designed into a closed-loop process for simultaneous capture and recovery of fluoride and silica as sodium silicofluoride (Na2SiF6) from mixed fluoride-rich and silica-rich wastewaters, as well as achieving zero liquid discharge. This RCUF-BMED system comprised two key parts: (1) capture of fluoride and silica from two wastewaters using acid, and recovery of the Na2SiF6 using base by UF and (2) UF permeate conversion for acid/base and freshwater generation by BMED. With the optimized RCUF-BMED system, fluoride and silica can be selectively captured from wastewater with removal efficiencies higher than 99%. The Na2SiF6 recovery was around 72% with a high purity of 99.1%. The aging and cyclic experiments demonstrated the high stability and recyclability of the RCUF-BMED system. This RCUF-BMED system has successfully achieved the conversion of toxic fluoride and silica into valuable Na2SiF6 from mixed wastewaters, which shows great application potential in the industry–resource–environment nexus.

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Chemical precipitation at extreme fluoride concentration and potential recovery of CaF2 particles by fluidized-bed homogenous crystallization process

Cited by 49 publications

References 66 publications

Recovery of cobalt and copper from single- and co-contaminated simulated electroplating wastewater via carbonate and hydroxide precipitation

Recovery of cobalt and copper from single- and co-contaminated simulated electroplating wastewater via carbonate and hydroxide precipitation

Hybrid carbonaceous adsorbents based on clay and cellulose for cadmium recovery from aqueous solution

Recovery of Fluoride-Rich and Silica-Rich Wastewaters as Valuable Resources: A Resource Capture Ultrafiltration–Bipolar Membrane Electrodialysis-Based Closed-Loop Process

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