首页|Treatment of synthetic zinc and nickel wastewater and identification of its crystallization products by fluidized bed homogeneous crystallization technology
Treatment of synthetic zinc and nickel wastewater and identification of its crystallization products by fluidized bed homogeneous crystallization technology
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NSTL
Heavy metals such as zinc and nickel can be found in wastewater from steel electroplating trace concentrations. These heavy metals harm the ecosystem and human health, which must be addressed. This study aimed to use fluidized bed homogeneous crystallization process (FBHCP) to recover nickel-zinc crystal from simulated electroplating wastewater. The best-operating conditions include a 10.2 initial pH of the crystallization reagent, variable nickel ion concentrations of 200 - 500 mg·L~(-1), and variable zinc ion concentrations of 100 - 400 mg·L~(-1). The nickel-zinc solution has a starting concentration of 300 mg L~(-1) of both nickel ions and zinc ions and a 1.75 molar ratio (MR) of [CO3~(2-)]/[Ni~(2+)+Zn~(2+)]. The highest removal rate for zinc was 99.6 %, and for nickel was 88.7 %. According to SEM morphology, the crystals generated have a high-density smooth crystal with pores. According to XRD analysis, the crystals generated were layered hydroxide salts (LHS) of nickel-zinc with the structural formula. FBHCP was employed to successfully recover NiZn - LHS crystals from simulated wastewaters, which can now be utilized for future adsorption applications.
NSTL
