The Experts below are selected from a list of 19593 Experts worldwide ranked by ideXlab platform
Muhammad Saleem Arif - One of the best experts on this subject based on the ideXlab platform.
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fresh and composted Industrial Sludge restore soil functions in surface soil of degraded agricultural land
Science of The Total Environment, 2018Co-Authors: Muhammad Saleem Arif, Muhammad Riaz, Sher Muhammad Shahzad, Tahira Yasmeen, Muhammad Ashraf, M A Siddique, Muhammad Salman Mubarik, Luca BragazzaAbstract:A field study was conducted to test the potential of 5-year consecutive application of fresh Industrial Sludge (FIS) and composted Industrial Sludge (CIS) to restore soil functions at surface (0-15cm) and subsurface (15-30cm) of the degraded agricultural land. Sludge amendments increased soil fertility parameters including total organic carbon (TOC), soil available nitrogen (SAN), soil available phosphorus (SAP) and soil available potassium (SAK) at 0-15cm depth. Soil enzyme activities i.e. dehydrogenase (DHA), β-glucosidase (BGA) and alkaline phosphatase (ALp) were significantly enhanced by FIS and CIS amendments in surface soil. However, urease activity (UA) and acid phosphatase (ACp) were significantly reduced compared to control soil. The results showed that Sludge amendments significantly increased microbial biomass nitrogen (MBN) and microbial biomass phosphorus (MBP) at both soil depth, and soil microbial biomass carbon (MBC) only at 0-15cm depth. Significant changes were also observed in the population of soil culturable microflora (bacteria, fungi and actinomycetes) with CIS amendment in surface soil suggesting persistence of microbial activity owing to the addition of organic matter source. Sludge amendments significantly reduced soil heavy metal concentrations at 0-15cm depth, and the effect was more pronounced with CIS compared to unamended control soil. Sludge amendments generally had no significant impact on soil heavy metal concentrations in subsoil. Agronomic viability test involving maize was performed to evaluate phytotoxicity of soil solution extract at surface and sub-surface soil. Maize seeds grown in solution extract (0-15cm) from Sludge treated soil showed a significant increase of relative seed germination (RSG), relative root growth (RRG) and germination index (GI). These results suggested that both Sludge amendments significantly improved soil properties, however, the CIS amendment was relatively more effective in restoring soil functions and effectively immobilizing wastewater derived heavy metals compared to FIS treatment.
Karin A Block - One of the best experts on this subject based on the ideXlab platform.
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effect of pyrolysis temperature and time on catalytic performance of sewage Sludge Industrial Sludge based composite adsorbents
Applied Catalysis B-environmental, 2006Co-Authors: Teresa J Bandosz, Karin A BlockAbstract:Abstract Adsorbents for removal of hydrogen sulfide from moist air were prepared from sewage Sludge, waste oil Sludge and their 50:50 mixture by pyrolysis at 650 and 950 °C for either half an hour or an hour. The resulting materials were characterized using sorption of nitrogen, thermal analysis, pH measurements and X-ray diffraction. Their catalytic performance was evaluated in hydrogen sulfide reactive adsorption via a dynamic test. The adsorbents have high capacity for hydrogen sulfide removal and high selectivity for its conversion to elemental sulfur. That sulfur is stored in the pore system, mainly mesopores. In some cases, after the oxidation, a secondary pore system is formed within the deposited sulfur. Either the capacity or selectivity depends on the pyrolysis temperature, time, and the specific chemistry of the Sludge precursors. They govern the development of porosity and formation of new mineral-like catalytic components through solid-state reaction.
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removal of hydrogen sulfide on composite sewage Sludge Industrial Sludge based adsorbents
Industrial & Engineering Chemistry Research, 2006Co-Authors: Teresa J Bandosz, Karin A BlockAbstract:The Sludge-based adsorbents were obtained either from mixtures of sewage Sludge, waste oil Sludge, and metal Sludge or single components by carbonization at 650 °C in an inert atmosphere. The materials were used as media to remove hydrogen sulfide at room temperature in the presence of moisture. The initial and exhausted adsorbents after the breakthrough tests were characterized using sorption of nitrogen, thermal analysis, XRD, ICP, and surface pH measurements. Although on all materials hydrogen sulfide is oxidized to elemental sulfur, exceptionally good performance is obtained on the waste oil Sludge-based adsorbent. This is attributed to the combined effects of surface chemistry and porosity. High pore volume of the waste oil Sludge-based adsorbent provides space to store 30 wt % elemental sulfur formed when hydrogen sulfide undergoes oxidation on the surface. Mixing Sludges and carbonization of their mixtures result in adsorbents whose capacity, although smaller than that for the single-component wast...
Teresa J Bandosz - One of the best experts on this subject based on the ideXlab platform.
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removal of copper on composite sewage Sludge Industrial Sludge based adsorbents the role of surface chemistry
Joint International Conference on Information Sciences, 2006Co-Authors: Mykola Seredych, Teresa J BandoszAbstract:Abstract Sewage Sludge and Industrial waste oil Sludge were pyrolyzed in an inert atmosphere at 650 or 950 °C, either as single components or as 50:50 mixtures. Composite materials were used as adsorbents of copper ions from aqueous solution. The capacity for copper removal was comparable to that of commercial activated carbon. To relate the performance of materials to their properties, the surface features were characterized using adsorption of nitrogen, thermal analysis, XRF, potentiometric titration, and elemental analysis. The results indicated that a high copper removal capacity could be linked to basic surface pH and specific compounds present on the surface. The high removal ability of materials obtained at 650 °C is attributed to cation exchange reactions between calcium and magnesium in aluminosilicates, formed on their surface during heat treatment, and copper. On the other hand, the high degree of mineralization of the surface of the materials obtained at 950 °C promotes copper complexation and its surface precipitation as hydroxides or hydroxylcarbonate entities.
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effect of pyrolysis temperature and time on catalytic performance of sewage Sludge Industrial Sludge based composite adsorbents
Applied Catalysis B-environmental, 2006Co-Authors: Teresa J Bandosz, Karin A BlockAbstract:Abstract Adsorbents for removal of hydrogen sulfide from moist air were prepared from sewage Sludge, waste oil Sludge and their 50:50 mixture by pyrolysis at 650 and 950 °C for either half an hour or an hour. The resulting materials were characterized using sorption of nitrogen, thermal analysis, pH measurements and X-ray diffraction. Their catalytic performance was evaluated in hydrogen sulfide reactive adsorption via a dynamic test. The adsorbents have high capacity for hydrogen sulfide removal and high selectivity for its conversion to elemental sulfur. That sulfur is stored in the pore system, mainly mesopores. In some cases, after the oxidation, a secondary pore system is formed within the deposited sulfur. Either the capacity or selectivity depends on the pyrolysis temperature, time, and the specific chemistry of the Sludge precursors. They govern the development of porosity and formation of new mineral-like catalytic components through solid-state reaction.
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removal of hydrogen sulfide on composite sewage Sludge Industrial Sludge based adsorbents
Industrial & Engineering Chemistry Research, 2006Co-Authors: Teresa J Bandosz, Karin A BlockAbstract:The Sludge-based adsorbents were obtained either from mixtures of sewage Sludge, waste oil Sludge, and metal Sludge or single components by carbonization at 650 °C in an inert atmosphere. The materials were used as media to remove hydrogen sulfide at room temperature in the presence of moisture. The initial and exhausted adsorbents after the breakthrough tests were characterized using sorption of nitrogen, thermal analysis, XRD, ICP, and surface pH measurements. Although on all materials hydrogen sulfide is oxidized to elemental sulfur, exceptionally good performance is obtained on the waste oil Sludge-based adsorbent. This is attributed to the combined effects of surface chemistry and porosity. High pore volume of the waste oil Sludge-based adsorbent provides space to store 30 wt % elemental sulfur formed when hydrogen sulfide undergoes oxidation on the surface. Mixing Sludges and carbonization of their mixtures result in adsorbents whose capacity, although smaller than that for the single-component wast...
Duujong Lee - One of the best experts on this subject based on the ideXlab platform.
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effects of sodium salt additive to produce ultra lightweight aggregates from Industrial Sludge marine clay mix laboratory trials
Journal of The Taiwan Institute of Chemical Engineers, 2020Co-Authors: Chao Yu Chien, Kuanyeow Show, Chihpin Huang, Yingju Chang, Duujong LeeAbstract:Abstract The production of lightweight aggregates from waste is regarded as an environmentally benign means of recycling waste into materials for green building construction, supporting the circular economies of modern societies. In this investigation, aggregates are synthesized from Industrial Sludge-marine clay mixes using thermal sintering at 1000‒1300 °C with or without the addition of two sodium salts. The Sludge-clay 50/50 mix that is fired at 1200 °C and the 0/100 to 50/50 mixes that are fired at 1300 °C yield aggregates with a specific gravity of less than unity (lightweight aggregates). The addition of two sodium salts at 1.5% w/w facilitated the formation of lightweight aggregates. This study reports the first time the production of ultra-lightweight aggregates with a specific gravity of less than 0.35 g/cm3 and sufficiently low water adsorption ratios from a 50/50 mixture with added NaCl and from a 20/80 mix with added Na2CO3 for construction material use. The sodium salt is posited to change the melt properties at the firing temperature used, causing the molten layers to retain their integrity when subjected to gas blasting with the formation of large internal pores and sufficient surface sealing.
Luca Bragazza - One of the best experts on this subject based on the ideXlab platform.
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fresh and composted Industrial Sludge restore soil functions in surface soil of degraded agricultural land
Science of The Total Environment, 2018Co-Authors: Muhammad Saleem Arif, Muhammad Riaz, Sher Muhammad Shahzad, Tahira Yasmeen, Muhammad Ashraf, M A Siddique, Muhammad Salman Mubarik, Luca BragazzaAbstract:A field study was conducted to test the potential of 5-year consecutive application of fresh Industrial Sludge (FIS) and composted Industrial Sludge (CIS) to restore soil functions at surface (0-15cm) and subsurface (15-30cm) of the degraded agricultural land. Sludge amendments increased soil fertility parameters including total organic carbon (TOC), soil available nitrogen (SAN), soil available phosphorus (SAP) and soil available potassium (SAK) at 0-15cm depth. Soil enzyme activities i.e. dehydrogenase (DHA), β-glucosidase (BGA) and alkaline phosphatase (ALp) were significantly enhanced by FIS and CIS amendments in surface soil. However, urease activity (UA) and acid phosphatase (ACp) were significantly reduced compared to control soil. The results showed that Sludge amendments significantly increased microbial biomass nitrogen (MBN) and microbial biomass phosphorus (MBP) at both soil depth, and soil microbial biomass carbon (MBC) only at 0-15cm depth. Significant changes were also observed in the population of soil culturable microflora (bacteria, fungi and actinomycetes) with CIS amendment in surface soil suggesting persistence of microbial activity owing to the addition of organic matter source. Sludge amendments significantly reduced soil heavy metal concentrations at 0-15cm depth, and the effect was more pronounced with CIS compared to unamended control soil. Sludge amendments generally had no significant impact on soil heavy metal concentrations in subsoil. Agronomic viability test involving maize was performed to evaluate phytotoxicity of soil solution extract at surface and sub-surface soil. Maize seeds grown in solution extract (0-15cm) from Sludge treated soil showed a significant increase of relative seed germination (RSG), relative root growth (RRG) and germination index (GI). These results suggested that both Sludge amendments significantly improved soil properties, however, the CIS amendment was relatively more effective in restoring soil functions and effectively immobilizing wastewater derived heavy metals compared to FIS treatment.
