Removal of Cu~(2+) in aqueous solutions using sludge incineration slag as an adsorbent

摘要

Sewage sludge incineration slag, the waste generated in sewage sludge incineration, was obtained from a sewage treatment plant in Guangzhou and used as a low-cost sorbent for removing Cu(II) from wastewaters. The adsorption effectiveness and their factors of Cu~(2+) in aqueous solutions were simulated detailed using the adsorbents of the sludge incineration slag. The simulation contents and the factors included the adsorption time, the pH of solution and the dosage of adsorbents and so on. The results showed that at 30°C, the adsorption equilibrium of Cu~(2+) can be achieved in 6h and the best pH value of the solution was about 4.5-5.5. The removal rates of Cu~(2+) were increased with the adsorbent concentration increasing and the optimal concentration of adsorbent was 20-30g/L with the initial concentration of Cu~(2+) less than 25mg/L. At the best adsorption conditions, the removal rate of Cu~(2+) reached more than 80% and the adsorption capacity was 0.83-1.25mg/g.