Journal
ENVIRONMENTAL RESEARCH
Volume 236, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2023.116782
Keywords
Nickel sulfide; Sulfide removal; Fluidized-bed homogeneous crystallization; Cross-sectional surface loading
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In this study, fluidized-bed homogeneous crystallization (FBHC) was used to treat sulfide-containing wastewater. The operating parameters were optimized to achieve high removal of sulfur and nickel, resulting in high sulfur removal efficiency and crystallization ratio.
Sulfide-containing wastewater, characterized by its foul odor, corrosiveness, and toxicity, can endanger human health. Fluidized-bed homogeneous crystallization (FBHC) avoids the excessive sludge production commonly associated with conventional chemical precipitation methods. In this study, FBHC is used to treat sulfurcontaining synthetic wastewater. Furthermore, nickel-containing wastewater was utilized as a precipitant in the system, hence the advantage of simultaneous sulfur and nickel removal from the wastewater. The operating parameters, including pH, a precipitant dosage of [Ni2+]0/[S2- ]0, and cross-sectional surface loading (LS, kg/ m2h) are optimized. The optimum operating conditions of pH 9.8 & PLUSMN; 0.3, [Ni2+]0/[S2- ]0 = 0.8, and LS = 1.5 kg/ m2h results in total sulfur removal (TR) of 95.7% and crystallization ratio (CR) of 94.8%. The effect of organic compounds (acetic acid, oxalic acid, EDTA, and citric acid) and inorganic ions (NO3-, CO32-, PO43- , F-, and Cl-) on the nickel sulfide granulation process was discussed.
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