Abstract：In order to realize resource utilization of steel sludge and phosphorus removal in wastewater, steel wastewater sludge was used as an adsorbent for the phosphorus removal from wastewater. It studied the adsorption characteristics of phosphate by steel sludge, including influence factors, dynamic model, adsorption isotherm, and the mechanism of adsorption by scanning electron microscope (SEM) and X-ray diffractometer (XRD). The results showed that steel sludge had a good adsorption capacity for phosphate in wastewater. When temperature was 40℃ and pH was 2.00, the theoretical saturated adsorption capacity of phosphorus was 8.917mg/g.The data were well described by Langmuir model, indicating that it was a multilayer adsorption process. It took 60min to achieve adsorption equilibrium. It met the Pseudo second-order equation, demonstrating that the process was chemical adsorption. SEM and XRD analysis showed that there might be something like FePO4, CaxFey(PO4)2x/3+y on the surface of the steel sludge after adsorption, and it was speculated that the phosphorus was removed by precipitation with Fe3+ or Ca2+, and chemical adsorption of hydrolysates of Fe3+ and PO43- and then co-precipitation of complex compound through complexation reaction. Overall, steel sludge was a potential adsorbent for the removal of phosphorus in wastewater.
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