Sequential recovery of Cu(II), Cr(III), and Zn(II) from electroplating sludge leaching solution by an on-line biosorption method with dosage controlling

Phytoextraction of heavy metals from tannery sludge: A cleaner approach

“…In addition, the Napier grass has been utilized further for biogas production in biotechnological applications, energy production, reduction of biomass volume by composting, and use of biomass earlier 41–43 . Nevertheless, the use of organic and inorganic acids for chemical leaching has been trialed and got priority due to its higher efficiency to separate the metals where metals are dissolved and/or ionized in their hydroxide or other forms 44,45 . Other methods conceptualized by the researchers include electrodialysis, precipitation, thermal treatment, coagulation, co‐precipitation, electrodeposition, and biosorption where biosorption has been reported as the environment‐friendly approach for metals removal from sludges 44–47 .…”

“…[41][42][43] Nevertheless, the use of organic and inorganic acids for chemical leaching has been trialed and got priority due to its higher efficiency to separate the metals where metals are dissolved and/or ionized in their hydroxide or other forms. 44,45 Other methods conceptualized by the researchers include electrodialysis, precipitation, thermal treatment, co-precipitation, electrodeposition, and biosorption where biosorption has been reported as the environment-friendly approach for metals removal from sludges. [44][45][46][47] For this study, recycling of the accumulated metals in Napier grass might be possible through the newly developed sequential separation method of complex leaching with HNO 3 where Napier grass will be dissolved to make a solution.…”

“…44,45 Other methods conceptualized by the researchers include electrodialysis, precipitation, thermal treatment, co-precipitation, electrodeposition, and biosorption where biosorption has been reported as the environment-friendly approach for metals removal from sludges. [44][45][46][47] For this study, recycling of the accumulated metals in Napier grass might be possible through the newly developed sequential separation method of complex leaching with HNO 3 where Napier grass will be dissolved to make a solution. 44,46 According to the method, an online biosorption could be carried out using sorbent modified by diethylenetriamine (EDTA) as it was noticed to be effective for arresting Cr(III), Zn, and Cu(II) in the earlier study.…”

“…[44][45][46][47] For this study, recycling of the accumulated metals in Napier grass might be possible through the newly developed sequential separation method of complex leaching with HNO 3 where Napier grass will be dissolved to make a solution. 44,46 According to the method, an online biosorption could be carried out using sorbent modified by diethylenetriamine (EDTA) as it was noticed to be effective for arresting Cr(III), Zn, and Cu(II) in the earlier study. 44 It is highly recommended for further study to check the suitability of this method for the separation of metals from metal accumulated in Napier grass.…”

“…44,46 According to the method, an online biosorption could be carried out using sorbent modified by diethylenetriamine (EDTA) as it was noticed to be effective for arresting Cr(III), Zn, and Cu(II) in the earlier study. 44 It is highly recommended for further study to check the suitability of this method for the separation of metals from metal accumulated in Napier grass.…”