Fluoride-rich wastewater treatment by ballast-assisted precipitation with the selection of precipitants and discarded or recovered materials as ballast

Lacson, Carl Francis Z.; Lu, Ming‐Chun; Huang, Yen‐Chieh

doi:10.1016/j.jece.2021.105713

Cited by 17 publications

(8 citation statements)

References 39 publications

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“…6 c and d. The changes in the sludge volume could be attributed to the particle size and particle density as divulged by Lacson et al [33]. On the other hand, copper was easily removed using both carbonate and hydroxide systems as described in Fig.…”

Section: Effect Of Phmentioning

confidence: 81%

“…Thus, the necessary carbonate and hydroxide concentrations also increased probably causing greater sludge volume and slower settleability of precipitates (lower SSR) in the reaction system due to possible trapping of water molecules in the formed precipitates (Fig. 8d) [33]. Higher precipitant dosage as well as higher pH values lead to increase in nucleation number of particles and decrease in particle size, accordingly, causing slower sedimentation time in the precipitation system [9].…”

Section: −mentioning

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: Effect Of Phmentioning

confidence: 81%

Section: −mentioning

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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“…[P]/[M] ratio studied for both systems. This may have been caused by less dense sludge particles and smaller particle size [30]. No general trend was found for the sludge volume formed from single cobalt and single copper systems.…”

Section: Effect Of Precipitant Typementioning

confidence: 81%

“…A decreasing sludge volume was then observed from pH 9.0 to 12.0. These differences in the sludge volume produced may be attributed to the type of precipitates formed, particle size, and particle density as divulged by Lacson et al [30]. On the other hand, copper was easily removed using both carbonate and hydroxide precipitants as described in Figure 3b.…”

Section: Effect Of Phmentioning

confidence: 94%

“…necessary carbonate and hydroxide concentrations also increased probably causing greater sludge volume and slower settleability of precipitates (lower SSR) in the reaction system due to possible trapping of water molecules in the formed precipitates (Fig. 5d) [30]. Higher precipitant dosage as well as higher pH values lead to increase in nucleation number of particles and decrease in particle size, accordingly, causing slower sedimentation time in the precipitation system [9].…”

Section: Effect Of Phmentioning

confidence: 99%

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Reclamation of Cobalt and Copper from Single- and Co-contaminated Wastewater via Carbonate and Hydroxide Precipitation

Quiton

Huang

2021

Preprint

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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 7.0-8.0. Cobalt in both pollutant systems was almost completely removed at pH 10.0 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 lower sludge density than that of hydroxide precipitation.

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An insight into microelectronics industry wastewater treatment, current challenges, and future perspectives: a critical review

Noman,

Ali Al-Gheethi,

Al-Sahari

et al. 2024

Appl Water Sci

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The microelectronics industry wastewater is attracting the scientific community and industry attention due to the high amount of organic and inorganic pollutants produced. Pollutants in microelectronic wastewater are considered qualitative contaminants, found in low concentrations but present with high risks to the environment and public health. The current paper highlights the most common pollutants in microelectronics wastewater and discusses the recent treatment technologies used to remove these contaminates. The review process was conducted based on the identification and screening of microelectronic wastewater and the principle of contaminant detection reported in previous research literature. It appears that tetramethylammonium hydroxide and ammonium are the major organic compounds in microelectronic wastewater, while heavy metals are among the inorganic pollutants with high environmental toxicity. The membrane filtration is the most efficient method for removing the pollutants (more than 90%) and producing ultrapure water. However, wastewater should be subjected to primary treatment using chemical and biological methods before undergoing the ultrafiltration process. The zero-discharge concept is more applicable in the microelectronics industries due to the stringent regulations associated with these industries. Microelectronic sludge represents the main challenge in wastewater recycling, while advanced treatment methods have been suggested for sludge treatment. More effort is required to recycle microelectronics owing to the high prices related to the disposal of these solids’ wastes.

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Fluoride-rich wastewater treatment by ballast-assisted precipitation with the selection of precipitants and discarded or recovered materials as ballast

Cited by 17 publications

References 39 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

Reclamation of Cobalt and Copper from Single- and Co-contaminated Wastewater via Carbonate and Hydroxide Precipitation

An insight into microelectronics industry wastewater treatment, current challenges, and future perspectives: a critical review

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