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首页> 外文期刊>Journal of Solid Waste Technology and Management >SEQUENTIAL LEACHING OF TRACE ELEMENTS IN BOTTOM ASH FROM A FLUIDIZED BED CO-COMBUSTION BOILER AT A PULP AND PAPER MILL COMPLEX
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SEQUENTIAL LEACHING OF TRACE ELEMENTS IN BOTTOM ASH FROM A FLUIDIZED BED CO-COMBUSTION BOILER AT A PULP AND PAPER MILL COMPLEX

机译：浆造纸复合流化床锅炉底部灰分中微量元素的淋溶研究。

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A five-stage, sequential leaching procedure was used to fractionate trace elements (Cd, Cu, Pb, Cr, Zn, Ni, Co, As, V, Ba and Ti) in bottom ash into the following fractions: the water-soluble fraction (H_2O), exchangeable fraction (CH_3COOH), easily reduced fraction (HONH_3Cl), oxidizable fraction (H_2O_2 + CH_3COONH_4), and the residual fraction (HF + HNO_3 + HCl). The bottom ash was derived from the electrostatic precipitator of a fluidized bed boiler in the co-combustion (55 % bark and wood residues, 45 % peat) process at a pulp and paper mill in Northern Finland. Because of the strongly alkaline nature (pH ～ 12.6) and elevated Ca (53 g kg~1), Mg (3.6 g kg~(-1)), P (1.3 g kg~(-1)) and K (2.4 g kg~(-1)) concentrations, the bottom ash could serve as a soil amendment agent for liming purposes, and is also a potential fertilizer. According to the leaching studies, the elevated concentrations of Pb (6.3 mg kg~(-1)), Cr (3.8 mg kg~(-1)) and Ba (271 mg kg~(-1)) extracted under oxidizable conditions (leaching stage 4), indicate that these metals may be mobilized and become bioavailable as a result of a change in pH.
机译：采用五阶段顺序浸出程序将底灰中的痕量元素（Cd，Cu，Pb，Cr，Zn，Ni，Co，As，V，Ba和Ti）分馏为以下馏分：水溶性馏分（H_2O），可交换级分（CH_3COOH），易还原级分（HONH_3Cl），可氧化级分（H_2O_2 + CH_3COONH_4）和残余级分（HF + HNO_3 + HCl）。底灰来自芬兰北部一家纸浆和造纸厂的共燃过程中流化床锅炉的静电除尘器（55％的树皮和木材残渣，45％的泥煤）。由于具有强碱性（pH〜12.6）和较高的Ca（53 g kg〜（-1）），Mg（3.6 g kg〜（-1）），P（1.3 g kg〜（-1））和K（2.4 g底灰可在一定浓度（kg-1（-1））下用作土壤改良剂，也可作为肥料。根据浸出研究，在可氧化条件下提取的Pb（6.3 mg kg〜（-1）），Cr（3.8 mg kg〜（-1））和Ba（271 mg kg〜（-1））的浓度较高（浸出阶段4）表示由于pH值的变化，这些金属可能被迁移并变为可生物利用的。

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