PREPARATION OF STRAW-SLUDGE BASED ACTIVATED CARBON FOR THE TREATMENT OF PHOSPHORUS-CONTAINING WASTEWATER
Keywords:
Straw, Sludge, Composite activated carbon, Adsorption performance, Phosphorus-containing wastewaterAbstract
In this study, rapeseed straw and dewatered sludge were used as raw materials and ZnCl₂ as an activator to prepare a straw-sludge based composite activated carbon via a mixed co-carbonization method. Single-factor and orthogonal experiments were conducted to investigate the effects of carbonization temperature, solid-liquid ratio, activation time, raw material ratio, and activator concentration on the iodine adsorption value of the composite activated carbon, aiming to optimize the preparation process. The results showed that the optimal preparation conditions for the composite activated carbon were: raw material ratio (sludge:straw) of 1:3, solid-liquid ratio of 1:3, activation time of 60 min, ZnCl₂ concentration of 3.5 mol/L, and carbonization temperature of 500 ℃. The composite activated carbon prepared under the optimal conditions was then utilized to adsorb PO₄³⁻ in water, and the effects of initial wastewater concentration, activated carbon dosage, and wastewater pH on the adsorption performance were investigated. The results demonstrated that under the conditions of an initial wastewater concentration of 40 mg/L, an activated carbon dosage of 40 g/L, and a pH of 7, the removal rate of PO₄³⁻ exceeded 93%, with an adsorption capacity of 1.17 mg/g.References
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