摘要
在对典型海岸线实地调研的基础上,模拟不同盐度海岸线环境(10mg/g和35mg/gNaCl含量),并对比现有相关研究(500mg/gNaCl含量),对海岸线塑料垃圾进行低温热解.通过检测其热解固、液、气产物组成,分析了海岸线环境对塑料垃圾低温热解特性和污染物排放的影响.结果表明,在550℃低温热解过程中,砂质和岩基塑料垃圾热解产生的主要气体为CO和CH_(4),NaCl可以增加热解气体的产量,35mg/g时增加程度最明显,其中砂质塑料热解气体产率从18.97%增加到26.07%,岩基塑料从19.27%增加到30.12%,但NaCl同时会降低气体的释放速率;所有样品的NaCl基本留在了固体残渣中,其他产物中几乎没有检测到含氯物质的存在,且发现NaCl可以减少岩基塑料热解颗粒物的产生.该结果说明海岸线塑料垃圾低温热解处置可以有效控制含氯污染物排放.
This study investigated the characteristics of low-temperature pyrolysis of shoreline plastics under different salinity conditions,including 10 mg/g,35 mg/g,and 500 mg/g NaCl.The composition of pyrolysis products was analyzed.Results showed that CO and CH_(4) were the main gas products of the plastics collected from sandy and rocky shorelines at 550℃.Moreover,NaCl could improve the gas yield,and the increase was most obvious at 35 mg/g.The pyrolysis gas yield of sandy and rocky shoreline plastics increased from 18.97%to 26.07%,and from 19.27%to 30.12%,respectively.However,NaCl decreased the gas release rate.Most NaCl remained in the solid residue,while few chlorine-containing substances were detected in other products.In addition,NaCl could also reduce the generation of particulate matter of rocky shoreline plastics.These findings indicated that the discharge of chlorine pollutants from shoreline plastics can be effectively controlled via low-temperature pyrolysis.
作者
王倩
陈钦冬
章佳文
吴华南
徐期勇
WANG Qian;CHEN Qin-dong;ZHANG Jia-wen;WU Hua-nan;XU Qi-yong(School of Environment and Energy,Peking University Shenzhen Graduate School,Shenzhen 518055,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2021年第8期3684-3692,共9页
China Environmental Science
基金
国家重点研发计划项目(2018YFC1902903)。
关键词
海岸线塑料垃圾
低温热解
产物组成
污染物排放
shoreline plastic waste
low-temperature pyrolysis
product composition
pollutant emission
