Post treatment of antibiotic wastewater by adsorption on activated carbon

Abstract

Abstract.The most common method of treating industrial wastewater involves biomethanation in anaerobic digesters. This biological treatment process is ineffective in color removal and it requires post-treatment methods. The color is the first contaminant in wastewater which affects the water bodies in several ways. As the anaerobically digested antibiotic wastewater was found with color, an attempt was made to remove color using granulated activated carbon as an adsorbent. Experiments were carried out in batch reactors to find out the color removal efficiency of the wastewater at four different dosages such as 25, 50, 75 and 100 mg of adsorbent material at each of the four different initial concentrations of effluent like 1956, 1450, 1251 and 1040 mg COD/L. The steady state values of color removal efficiencies were 96.6, 97.64, 98.64 and 99.63%, respectively, using 100 mg of activated carbon under shaking condition at the end of the 120 th min. The effect of contact time on the percentage of color removal was also studied. It was observed that the adsorption of effluent obtained equilibrium at 120 minutes. The equilibrium data fitted well with the Langmuir and Freundlich isotherms.

Urea-Functionalized MIL-101(Cr)@AC as a New Adsorbent to Remove Sulfacetamide in Wastewater Treatment

“…Compared with first-order kinetics, the high R 2 value indicated the adsorption behavior followed pseudo-second-order kinetics, indicating the adsorption process was not only a physical adsorption process but also included external liquid film diffusion and particle internal diffusion. Thus, urea-MIL-101­(Cr)@AC adsorption of SA comprised a variety of adsorption mechanisms, likely including electrostatic interactions between SA and adsorbent and π–π interactions . Compared with adsorbents before modification, the kinetic pseudo-second-order rate k of urea-MIL-101­(Cr)@AC was lower, which may be attributed to SA molecules competing for active adsorption sites.…”

“…Thus, urea-MIL-101(Cr)@AC adsorption of SA comprised a variety of adsorption mechanisms, likely including electrostatic interactions between SA and adsorbent and π−π interactions. 35 Compared with adsorbents before modification, the kinetic pseudo-second-order rate k of urea-MIL-101(Cr)@ AC was lower, which may be attributed to SA molecules competing for active adsorption sites. Specific hydrogen bonds generated by the functionalization of MOFs increased the adsorption capacity.…”