Study on passivation of heavy metals in sewage sludge with fly ash

2018 International Conference on New Energy and Future Energy System

Wang, D.F.^1 ; Wang, X.Q.^1 ; Li, L.X.^1 ; Zhang, X.^1

College of Environmental Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan

250353, China^1

关键词: Passivation effect;    Physical and chemical properties;    Research object;    Urban wastewater treatment plants;    Wastewater treatment plants;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/188/1/012059/pdf
DOI  :  10.1088/1755-1315/188/1/012059

来源: IOP

【 摘 要 】

The dewatering sewage sludge from the Wastewater Treatment Plant in the West of Jinan was chosen as the research object. Its physical and chemical properties were analyzed to investigate the passivation effect of fly ash on the four kinds of heavy metal (Cu, Ni, Zn and Pb) in sewage sludge. The results showed that the contents of organic matter, N and P were rich in the sludge and contents of the four heavy metals were accord with the standard "Disposal of sludge from urban wastewater treatment plant-Quality of sludge used in gardens or parks standard" (GB/T23486-2009). The four kinds of heavy metals could be passivated effectively by adding fly ash. The optimum effect could be obtained by adding 10-20% fly ash. It's unfavorable to the passivation of Zn when the applied amount of fly ash exceeded 40%. The passivation effect of fly ash was mainly ion exchange and raising the pH to convert heavy metals into insoluble salts.