首页|Syngas production and heavy metal dynamics during supercritical water gasification of sewage sludge

Syngas production and heavy metal dynamics during supercritical water gasification of sewage sludge

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The rising production of sewage sludge,characterized by high organic content and excessive heavy metals,necessitates an effective treatment method.This study investigated the production of syngas and the migration and transformation behavior of heavy metals such as Zn,Ni,Cr,Cu,and As during supercritical water gasification(SCWG)of sewage sludge.The experiments were conducted without or with alkaline additives at temperatures between 380 to 420 ℃ and retention time from 15 to 60 min.The results revealed that the highest syngas yield reached 10.9 mol/kg with an H2 concentration of 44.7％at 420 ℃ and 60 min.In this process,heavy metals were effectively immobilized and converted into a more stable form,whereas higher temperatures and longer retention time enhanced this effect.The introduction of alkaline additives(NaOH,KOH,Ca(OH)2,Na2CO3,and K2CO3)led to the redistribution of heavy metals,further promoting the stabilization of Zn,Cr,and Cu.An environmental risk assessment showed that SCWG could significantly lower the risk associated with heavy metals to a low or negligible level.

SludgeHeavy metalImmobilizationSupercritical water gasificationEnvironmental risk assessment

Mi Yan、Shuai Liu、Haihua Zhang、Rendong Zheng、Jintao Cui、Dan Wang、Dicka Ar Rahim、Ekkachai Kanchanatip

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Institute of Energy and Power Engineering,Zhejiang University of Technology,Hangzhou 310014,China

China Hangzhou Energy Group Co.,Ltd.,Hangzhou 310013,China

Hangzhou Linjiang Environmental Energy Co.,Ltd.,Hangzhou 310013,China

Department of Chemical Engineering,Bandung Institute of Technology,Bandung 40132,Indonesia

Department of Civil and Environmental Engineering,Faculty of Science and Engineering,Kasetsart University Chalermphrakiat Sakon Nakhon Province Campus,Sakon Nakhon 47000,Thailand

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2024

10.1007/s11783-024-1909-z

环境科学与工程前沿
高等教育出版社

环境科学与工程前沿

影响因子：0.545
ISSN：2095-2201
年,卷(期)：2024.18(12)