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In this study, a specially developed unique process was used to prepare sludge-based activated adsorbents (SBAs) from municipal sewage sludge collected from a wastewater treatment plant in Sharjah. A reaction chamber is designed to allow the carbonization and activation of sewage sludge in a saturated steam environment generated inside the chamber...
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Context 1
... analysis of the five samples reveals very interesting results (Table 4). According to the ASTM E1131 method (2008), highly volatile matter vapourize in nitrogen below 150 °C, whereas medium volatile matter vapourize or decompose in nitrogen between 150 and 650 °C. ...Context 2
... the percentage of carbon in the SS sample is noticeably higher (78%) than those reported for the SBA samples (NN and SN) activated by the conventional methods (51.7% and 52.6%, respectively). These results are consistent with those from thermal analysis (Table 4) where the steam-activated sample revealed lower ash content. ...Similar publications
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Citations
... In a previous work, activated adsorbents from sewage sludge were prepared using a novel semi-static carbonization ad activation processes [25,26]. The activated adsorbents were applied for the removal of lead ions from aqueous solution. ...
... Sewage sludge samples were obtained from a wastewater treatment plant in Dubai, UAE. The design of the carbonization and activation processes were done in the absence of any external flow as described in previous publications [25,26]. The carbonization and activation were done using a home-made stainless steel apparatus constructed in our facilities [26]. ...
... In briefly, the washed and un-washed sludge samples were dried inside an oven at 105°C followed by carbonization at 680°C for one hour in nitrogen environment. The carbonized samples were then homogeneously mixed with potassium hydroxide (KOH) fine powder at 1:3 (w/w) followed by activation at 680°C for one hour using internally generated steam at the same temperature [25,26]. The activated samples were washed with 1.0 M HCl then rinsed with distilled water until pH of deionized water was reached. ...
A new adsorbent material from sewage sludge of relatively high surface area (2,230 m 2 /g) was prepared by carbonization and chemical activation using steam at controlled semi-static conditions. The pore size distributions of the sludge-based activated adsorbent (SW-A2) and commercial activated carbon were compared and found to be remarkably different with noticeable presence of larger micro-pores and small meso-poresfor SW-A2. The newly developed activated adsorbent was then evaluated for the adsorption of a polycyclic aromatic hydrocarbon (PAH); benzo (a) anthracene. The adsorption isotherms of benzo (a) anthracene on the adsorbent materials were fitted to both Lang-muir and Freundlich isotherms. The Langmuir isotherm was found to be the best fit for the adsorp-tion of the benzo (a) anthraceneon ACwith K and q max of 0.43L/mg and 70.5 mg/g, respectively. On the other hand, the adsorption isotherm for SW-A2 was found to follow the Freundlich isotherm with K f and n of 100.8 mg/g (L/mol)-0.763 and 1.31, respectively. The adsorption kinetics for both adsorbents were found to follow pseudo second order kinetics with rate constant of 1.55 × 10-4 g mg-1 min-1 for SW-A2 and 1.44 × 10-4 g mg-1 min-1 for AC. The results of this study indicate the high potential of the newly developed sludge-based adsorbent as an efficient and successful material for the removal of carcinogenic PAHs from water body.
