Efficiency of Carbonate Precipitation and Removal of Copper and Nickel Ions from their Monocomponent and Two-component Aqueous Solutions (original) (raw)
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2021
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 precipi...
2015
Environmental protection becomes a difficult task as many industries produce wastes that cause serious pollution. An industrial solid waste of sugarcane had been converted into an inexpensive and effective adsorbent to be used for the removal of some metal from aqueous solution. Effect of various parameters e.g., metal ion concentration, adsorbent dose, solution pH, and contacting time on the removal of Cu (II), Ni (II), and Co (II) ions had been studied. Maximum adsorption of Cu (II), Ni (II), and Co (II) ions were 78 %, 72%, and 69 %, occurred at metal ion concentration 70 ppm and at pH value of 6.5, 6.0 and 6.0, respectively. A dose of 14 g/l of adsorbent was sufficient for the optimum removal of metal ions. The material exhibits good adsorption capacity and the adsorption data follow the Langmuir model better than the Freundlich model. Kinetic parameters of adsorbent for the removal of each metal ion from wastewater were studied.
International Journal of Engineering Research and Technology (IJERT), 2016
https://www.ijert.org/continuous-fixed-bed-column-adsorption-of-copper-ii-ions-from-aqueous-solution-by-calcium-carbonate https://www.ijert.org/research/continuous-fixed-bed-column-adsorption-of-copper-ii-ions-from-aqueous-solution-by-calcium-carbonate-IJERTV4IS120456.pdf The fixed bed column adsorption study was conducted in a column of 35 cm height, 2 cm inner diameter in which aqueous solution of copper (II) ions of concentration 20 mg/L at a constant flow rate of 10 mL/minute passed upwards through calcium carbonate bed of depth 10 cm. The break through time and exhaust time were found to be 153 and 344 minutes respectively. The time required for the formation of adsorbent zone was estimated as 85.95 minutes. The adsorption zone height was found to be 5.63 cm and the degree of saturation of the adsorbent bed was estimated as 69%. The rate at which the adsorption zone was moving through the bed was 1.77 cm/hour. The adsorption rate constant (K) was found out as 0.072 L/mg hour and adsorption capacity coefficient (N) as 1555.63 mg/L. The concentrations of heavy metal ions before and after adsorption process were measured by Atomic absorption spectroscopy. Almost 100 % removal of copper (II) ions was achieved during the experimental study. The adsorptive removal of copper (II) ions by CaCO3 was found effective and economic and can be applied for industrial waste water treatment.