Considering the Sludge Stabilization during the Wastewater Treatment Process Selection from Water Extraction of MSWI Fly Ash
Washing is a general pre-treatment process for municipal solid waste incinerator (MSWI) fly ash, which is aimed to remove the harmful soluble salts, to improve the regeneration process. The wastewater separated contains heavy metals and high concentration of chloride, is needed to be handled properly. In this article, Electro-aggregation method was applied to compare with traditional coagulation, and assessed the stabilization ability of heavy metals in the sludge. The parameters of the operation include the voltage, hydraulic retention time, pH, liquid-to-solid ratio of extraction, different electrode connection mode, and the stabilization reagent dosage. The removal efficiency of SS, Cu, Pb, and Zn during the wastewater treatment was around 85%, 97%, 97%, 98-100%, and 100% respectively. In order to make the electro-aggregation sludge will be safer and lower leachability, the addition of phosphate before entering the electrical reaction unit. When added 200 mg/L of NaH2PO4, 100% Pb could be removed under the conditions of 100 V, 40 sec HRT, and heavy metals in the sludge could be stabilized to satisfy the TCLP limitations.
MSWI fly-ash water extraction electro-aggregation heavy metals stabilization fly-ash regeneration.
Sue-Huai Gau Cheng-Gang Chen Chang-Jung Sun Hsin-Yi Ho
Department of Water Resources and Environmental Engineering, Tamkang University, Tamsui, Taipei Coun Department of Civil and Environment Engineering, Nanya Institute of Technology, Chung-Li City,Taoyua
国际会议
The 3rd International Conference on Waste Management and Technology(第三届固体废物管理与技术国际研讨会)
北京
英文
51-57
2008-11-05（万方平台首次上网日期，不代表论文的发表时间）