Department of Chemical Engineering, Tatung University, 40 Chungshan North Road, 3rd Sec, Taipei 10451, Taiwan.
J Hazard Mater. 2010 May 15;177(1-3):881-6. doi: 10.1016/j.jhazmat.2009.12.115. Epub 2010 Jan 7.
Heavy metals contaminated wastewater sludge is classified as hazardous solid waste and needs to be properly treated to prevent releasing heavy metals to the environment. In this study, the wastewater treatment sludge from a printed circuit board manufacturing plant was treated in a batch reactor by sulfuric acid to remove the contained heavy metals. The effects of sulfuric acid concentration and solid to liquid ratio on the heavy metal removal efficiencies were investigated. The experimental results showed that the total and individual heavy metal removal efficiencies increased with increasing sulfuric acid concentration, but decreased with increasing solid to liquid ratio. A mathematical model was developed to predict the residual sludge weights at varying sulfuric concentrations and solid to liquid ratios. The trivalent heavy metal ions, iron and chromium were more difficult to be removed than the divalent ions, copper, zinc, nickel, and cadmium. For 5 g/L solid to liquid ratio, more than 99.9% of heavy metals can be removed from the sludge by treating with 0.5M sulfuric acid in 2h.
重金属污染废水污泥被归类为危险固体废物，需要进行适当处理，以防止重金属释放到环境中。在这项研究中，采用间歇式反应器，用硫酸处理来自印制电路板制造厂的废水处理污泥，以去除其中所含的重金属。考察了硫酸浓度和固液比对重金属去除效率的影响。实验结果表明，随着硫酸浓度的增加，重金属的总去除率和各单项重金属的去除率均提高，但随着固液比的增加而降低。建立了一个数学模型来预测不同硫酸浓度和固液比下剩余污泥量。三价重金属离子铁和铬比二价重金属铜、锌、镍和镉更难去除。对于 5g/L 的固液比，用 0.5M 硫酸在 2 小时内处理，可将污泥中的重金属去除 99.9%以上。
Zotero 插件