Efficient disposal of oily water pollution and oily sludge(OS)production with low energy demand has garnered significant attention for the low carbon transition of the petroleum industry.How to overcome the hardships ...Efficient disposal of oily water pollution and oily sludge(OS)production with low energy demand has garnered significant attention for the low carbon transition of the petroleum industry.How to overcome the hardships from severe emulsion and interaction with soil minerals in emulsion-soil(OS)is a significant challenge with the prospective opportunities of solar energy substitution.This paper proposed the solar-driven photothermal conversion technology for efficient dehydration of OS and purification of oily water using a multifunctional material.A biomass-based carbon aerogel(BCA-600)with a porous three-dimensional(3D)structure and photothermal conversion characteristics was synthesized.Interestingly,this carbon aerogel possessed adjustable surface wettability,enabling it to adsorb high viscosity crude oil on the water surface(4.28 g·g^(−1))and achieve demulsification-separation in water-in-oil emulsions(97.28%)with the assistance of solar irradiation.Accordingly,the synergistic action of solar heating and separation-adsorption of emulsion by BCA-600 contributed to the efficient photothermal dehydra-tion for both OS and emulsion.The highest dehydration efficiency for OS reached 90.68%with the OS/BCA-600 mass ratio of 10:2.Moreover,BCA-600 could remain in the dehydrated OS without separation to participate in the following pyrolysis with enhanced effects by confined-catalytic cracking,achieving a“one stone,two birds”effect.Overall,the solar photothermal approach exhibits significant potential for treating oily pollutants,reducing carbon emissions by more than 100 times compared to traditional thermal methods.This could be a strong push for the low carbon transition of the petroleum industry.展开更多
Pyrolysis is an effective method to treat oily sludge(OS)due to its balance between oil recovery and nonhazardous disposal.However,tank bottom OS contains a high content of heavy fractions,which creates obstacles for ...Pyrolysis is an effective method to treat oily sludge(OS)due to its balance between oil recovery and nonhazardous disposal.However,tank bottom OS contains a high content of heavy fractions,which creates obstacles for pyrolysis due to the high activation energy.The incomplete cracking of macromolecules and secondary polymerization decreases the oil quality and causes coking during the operation process.This study introduced polyethylene(PE)into OS to deploy the H/Ceff ratio of feedstocks for pyrolysis A strong interaction between OS and PE during copyrolysis could be observed from the TG/DTG curves.PE tightly participated in OS degradation,while OS also promoted PE degradation at high temperature.Apparent pits were generated in solid residues from copyrolysis,which was attributed to the uniform and violent gas release.In addition to HCN,other nitrogenous and sulphurous pollutants were inhibited.Accordingly,more gas products were attained after PE addition with more value-added compositions of alkanes and alkenes.Although the oil yield decreased after PE addition,the oil products from copyrolysis possessed higher heating values and higher contents of light fractions with short chains as well as paraffins.Consequently,copyrolysis of OS and PE significantly improved the pyrolysis process and resulted in high oil quality.展开更多
Large-scale utilization of solid waste is the key challenge in building sustainable infrastructure.Given the high demand for sandy soil stabilizers in subgrades,dams and other infrastructure projects and the high perm...Large-scale utilization of solid waste is the key challenge in building sustainable infrastructure.Given the high demand for sandy soil stabilizers in subgrades,dams and other infrastructure projects and the high permeability of sandy soil,a sulphoaluminate composite cementitious material(SCCM)was developed by incorporating solid waste-derived sulphoaluminate cementitious material(SAC),desulfurized gypsum,ground granulated blast furnace slag(GGBS),and supplementary industrial byproducts,which can be used as high-permeability stabilizers for sandy soil.The economic and environmental assessment revealed that the carbon emission factor of the SCCM throughout their whole life cycle was 135.8 kg/t.The results revealed that the unconfined compressive strength(UCS)of stabilized sandy soil for 28 d was the highest among all the stabilized sandy soils,and the 28 d immersion stability rate was 72.5%.The 28 d permeability coefficient of sandy soil stabilized by SCCM decreased from 8.7×10^(−4)cm/s for natural sandy soil to 5.7×10^(−7)cm/s,which was 1–2 orders of magnitude lower than that of SAC and ordinary Portland cement(OPC)stabilized sandy soil.Both scanning electron microscopy(SEM)and X-ray diffraction(XRD)showed the co-existence of ettringite and hydrated calcium silicate gel,and their addition improved the properties of the stabilized sandy soil.The results of the low-field nuclear magnetic resonance(LF-NMR)test revealed that the porosity of the SCCM stabilized sandy soil was lower than that of the SAC stabilized sandy soil and OPC,resulting in a dense structure.This study provides an innovative solution for the utilization of bulk solid waste in stabilizing sandy soil in infrastructure projects.展开更多
基金supported by the National Natural Science Foundation of China(52376205)the Chinese Academy of Engineering Strategic Research and Consulting Project(2023-XZ-38).
文摘Efficient disposal of oily water pollution and oily sludge(OS)production with low energy demand has garnered significant attention for the low carbon transition of the petroleum industry.How to overcome the hardships from severe emulsion and interaction with soil minerals in emulsion-soil(OS)is a significant challenge with the prospective opportunities of solar energy substitution.This paper proposed the solar-driven photothermal conversion technology for efficient dehydration of OS and purification of oily water using a multifunctional material.A biomass-based carbon aerogel(BCA-600)with a porous three-dimensional(3D)structure and photothermal conversion characteristics was synthesized.Interestingly,this carbon aerogel possessed adjustable surface wettability,enabling it to adsorb high viscosity crude oil on the water surface(4.28 g·g^(−1))and achieve demulsification-separation in water-in-oil emulsions(97.28%)with the assistance of solar irradiation.Accordingly,the synergistic action of solar heating and separation-adsorption of emulsion by BCA-600 contributed to the efficient photothermal dehydra-tion for both OS and emulsion.The highest dehydration efficiency for OS reached 90.68%with the OS/BCA-600 mass ratio of 10:2.Moreover,BCA-600 could remain in the dehydrated OS without separation to participate in the following pyrolysis with enhanced effects by confined-catalytic cracking,achieving a“one stone,two birds”effect.Overall,the solar photothermal approach exhibits significant potential for treating oily pollutants,reducing carbon emissions by more than 100 times compared to traditional thermal methods.This could be a strong push for the low carbon transition of the petroleum industry.
基金supported by the National Key Research and Deve lopment Program of China(No.2019YFC1903903)Young Elite Scientists Sponsorship Program by Tianjin(China)(No.TJSQNTJ-2020-13).
文摘Pyrolysis is an effective method to treat oily sludge(OS)due to its balance between oil recovery and nonhazardous disposal.However,tank bottom OS contains a high content of heavy fractions,which creates obstacles for pyrolysis due to the high activation energy.The incomplete cracking of macromolecules and secondary polymerization decreases the oil quality and causes coking during the operation process.This study introduced polyethylene(PE)into OS to deploy the H/Ceff ratio of feedstocks for pyrolysis A strong interaction between OS and PE during copyrolysis could be observed from the TG/DTG curves.PE tightly participated in OS degradation,while OS also promoted PE degradation at high temperature.Apparent pits were generated in solid residues from copyrolysis,which was attributed to the uniform and violent gas release.In addition to HCN,other nitrogenous and sulphurous pollutants were inhibited.Accordingly,more gas products were attained after PE addition with more value-added compositions of alkanes and alkenes.Although the oil yield decreased after PE addition,the oil products from copyrolysis possessed higher heating values and higher contents of light fractions with short chains as well as paraffins.Consequently,copyrolysis of OS and PE significantly improved the pyrolysis process and resulted in high oil quality.
基金supported by the National Key Research and Development Program of China(No.2024YFC3906800)the National Natural Science Foundation of China(No.52306154)+1 种基金the Natural Science Foundation of Shandong Province,China(No.ZR2024ME095)the Science and Technology Development Plan of Jinan(No.202323018)。
文摘Large-scale utilization of solid waste is the key challenge in building sustainable infrastructure.Given the high demand for sandy soil stabilizers in subgrades,dams and other infrastructure projects and the high permeability of sandy soil,a sulphoaluminate composite cementitious material(SCCM)was developed by incorporating solid waste-derived sulphoaluminate cementitious material(SAC),desulfurized gypsum,ground granulated blast furnace slag(GGBS),and supplementary industrial byproducts,which can be used as high-permeability stabilizers for sandy soil.The economic and environmental assessment revealed that the carbon emission factor of the SCCM throughout their whole life cycle was 135.8 kg/t.The results revealed that the unconfined compressive strength(UCS)of stabilized sandy soil for 28 d was the highest among all the stabilized sandy soils,and the 28 d immersion stability rate was 72.5%.The 28 d permeability coefficient of sandy soil stabilized by SCCM decreased from 8.7×10^(−4)cm/s for natural sandy soil to 5.7×10^(−7)cm/s,which was 1–2 orders of magnitude lower than that of SAC and ordinary Portland cement(OPC)stabilized sandy soil.Both scanning electron microscopy(SEM)and X-ray diffraction(XRD)showed the co-existence of ettringite and hydrated calcium silicate gel,and their addition improved the properties of the stabilized sandy soil.The results of the low-field nuclear magnetic resonance(LF-NMR)test revealed that the porosity of the SCCM stabilized sandy soil was lower than that of the SAC stabilized sandy soil and OPC,resulting in a dense structure.This study provides an innovative solution for the utilization of bulk solid waste in stabilizing sandy soil in infrastructure projects.
