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.

State Key Laboratory of Industrial Control Technology,College of Control Science and Engineering,Zhejiang University,Hangzhou 310027,China;Zhejiang SUPCON Technology Co.,Ltd.,Hangzhou 310053,China;State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China;School of Environmental Science and Engineering,Tianjin University/Tianjin Key Laboratory ofBBiomass/Wastes Utilization,Tianjin 300072,China

[1]Lujun Zhao;Jiaming Shao;Li Xiang;Yiping Feng;Zhihua Wang;Fawei Lin-.Co-pyrolysis of oil sludge with hydrogen-rich plastics in a vertical stirring reactor:Kinetic analysis,emissions,and products)[J].环境科学与工程前沿,2022(10):131-143

nonhazardous,copyrolysis,sulphurous

sludge,hydrogen,rich,plastics,vertical,stirring,reactor,Kinetic,analysis,emissions,products,Pyrolysis,effective,method,treat,oily,OS,balance,between,recovery,disposal,However,tank,bottom,contains,heavy,fractions,which,creates,obstacles,activation,energy,incomplete,cracking,macromolecules,secondary,polymerization,decreases,quality,causes,coking,during,operation,process,This,study,introduced,polyethylene,PE,into,deploy,Ceff,feedstocks,strong,interaction,could,observed,from,DTG,curves,tightly,participated,degradation,while,also,promoted,temperature,Apparent,pits,were,generated,solid,residues,was,attributed,uniform,violent,gas,release,In,addition,HCN,other,nitrogenous,pollutants,inhibited,Accordingly,more,attained,after,added,compositions,alkanes,alkenes,Although,yield,decreased,possessed,higher,heating,values,contents,light,short,chains,well,paraffins,Consequently,significantly,improved,resulted

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