Characterisation of sewage sludge-derived adsorbents for H2S removal. Part 2: Surface and pore structural evolution in chemical activation

H2S Adsorption/Oxidation on Materials Obtained Using Sulfuric Acid Activation of Sewage Sludge-Derived Fertilizer

“…The method of preparation of activated carbonaceous material from sewage sludge and sulfuric acid proposed in U.S. Patent 3,998,757 (7) was also applied by Lu and coworkers (12,13). As a result of pyrolysis in the presence of H 2 SO 4 the microporosity significantly increases and so does the yield of the carbonaceous phase.…”

“…Among the proposed applications of these new adsorbents are the removal of organics in the final stages of water cleaning (9), the removal of chlorinated organics (10), and the removal of acidic gases such as hydrogen sulfide or sulfur dioxide (4,(12)(13)(14). The adsorption capacity reported varies, depending on the nature of the sludge, activation method (12,13,15), and temperature treatment (4,14,15).…”

Development of Semi-Static Steam Process for the Production of Sludge-Based Adsorbents

“…Landfilling is not a sustainable option because it requires significant space and expensive equipment to control the release of gases, leachates and solids. In addition, the presence of suitable sites for landfills and reclamation are running short nowadays due to urbanization and application of more stringent environmental rules (Lu and Lau 1996;Smith et al 2009). Although sewage sludge is widely used as a fertilizer in agriculture, such practice is always associated with a high risk of soil and groundwater contamination with heavy metals and toxins (Athar and Vohora 1995).…”

Adsorption Characteristics of Benzene on Biosolid Adsorbent and Commercial Activated Carbons

“…The carbon content in the biosolid was low compared with commercial activated carbon, but many studies have shown the potential of biosolids for reuse as an adsorbent. 2,3,5,6 Predried biosolid was immersed in different concentrations, 0.5-5 M, of ZnCl 2 solutions and mixed for 24 hr. Next, the biosolid slurry was filtered and dried at 105°C for 24 hr.…”

“…An adsorbent was obtained from sewage sludge that was used for hydrogen sulfide (H 2 S) removal. 5 Khalili et al 6 used ZnCl 2 as the chemical activator and prepared activated carbon with a surface area Ͼ1000 m 2 /g from paper mill sludge. Benzene, a critical toxic pollutant and carcinogenic compound, is used as a raw material in the petrochemical industry.…”