معالجة الكبريتات المنتجة من مياه الصرف الصحي باستخدام الامتزاز بمواد محلية

Treatment of Sulfate Produced from wastewater by using adsorption with local Material

Abstract

Fouling by sulfate ion contamination constitutes a serious problem in the wastewater treatment. Using a locally produced novel composite adsorbent, the removal of sulfate from a contaminated solution was investigated in this study in batch and continuous mode operations. This adsorbent was made from waste and nearby materials as a low-cost local adsorbent by physical activation of sludge, bentonite, and limestone as (SBL composite) (the sutable dose equal to 0.5 g/50 mL) and was characterized by using FTIR, SEM, EDS, X-ray diffraction analysis (XRD), and BET.
Adsorption studies of the solutions were examined in batch mode through experiments replicated with different values of parameters such as contact time, agitation speed, pH, initial concentrations of contaminant and adsorbent dosages; the best values of these parameters were determined to be (60 min, 250 rpm, 900 mg/L, and 0.5 g/50 mL) respectively based on the higher removal efficiency attained. While the optimal values of these parameters were to be 6 L/hr, 6, 900 mg/L, 20 cm, and 5 multi cycle numbers respectively, for the continuous system, the effect of flow rate, pH, SO4-2 initial concentration, bed height, and multi cycle bed column on the breakthrough curve was studied in column bed continuous systems.
Due to its high determination coefficient (0.9798) in comparison to the other isotherm models, It was found that the Freundlich model provides a superior forecast for the adsorption processes. It was discovered that the sulfate adsorption process adheres to the pseudo-second-order kinetics model after applying both first order and second order kinetic models. These findings support the notion that chemisorption was the adsorption process.