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首页> 外文期刊>Journal of Solid Waste Technology and Management >EXTRACTABILITY AND BIOAVAILABIUTY OF HEAVY METALS AND SULFUR IN BOTTOM ASH AND FLY ASH FROM AN INDUSTRIAL POWER PLANT
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EXTRACTABILITY AND BIOAVAILABIUTY OF HEAVY METALS AND SULFUR IN BOTTOM ASH AND FLY ASH FROM AN INDUSTRIAL POWER PLANT

机译：工业发电厂底灰和粉煤灰中重金属和硫的可萃取性和生物利用度

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摘要

A five-stage sequential extraction procedure was used to determine the distribution of 11 metals (Cd, Cu, Pb, Cr, Mo, Zn, As, Co, V, Ni, Ba), and sulfur (S) in bottom ash and fly ash from a fluidized bed boiler at the industrial power plant of Laanilan Voima Oy in Oulu, Northern Finland, into the following fractions: (1) water-soluble fraction (H_2O), (2) exchangeable fraction (CH_3COOH), (3) easily reduced fraction (NH_2OH-HCI), (4) oxidizable fraction (H_2O_2 + CH_3COONH_4), and (5) residual fraction (HF + HNO_3 + HCI). Although the metals were extract-able in all fractions, the highest concentrations of most of the metals occurred in the residual fraction. This fraction is the non-mobile fraction and is potentially the least harmful. The concentration of easily soluble Ca (24.5 g kg~(-1) (d.w.) in the fly ash was ca. 15 times higher than the typical value of 1.6 g kg~(-1) (d.w.) in arable land in Central Finland indicating that the fly ash is a potential agent for soil remediation and improving soil fertility. Both types of ash were alkaline (pH ～ 9.4 - 9.7), which means that they have a pH - buffering capacity. According to the Finnish legislation, both types of ash can be used as a fertilizer in the forest. This paper covers also examples how ashes are utilized in some Finnish pulp and paper mills.
机译：采用五阶段顺序萃取程序确定底灰和粉煤灰中11种金属（Cd，Cu，Pb，Cr，Mo，Zn，As，Co，V，Ni，Ba）和硫（S）的分布来自芬兰北部奥卢Laanilan Voima Oy工业电厂流化床锅炉的灰分，分为以下几部分：（1）水溶性部分（H_2O），（2）可交换部分（CH_3COOH），（3）还原级分（NH_2OH-HCl），（4）可氧化级分（H_2O_2 + CH_3COONH_4）和（5）残余级分（HF + HNO_3 + HCl）。尽管金属可以在所有馏分中提取，但大多数金属的最高浓度出现在残留馏分中。该馏分是非流动性馏分，潜在危害最小。粉煤灰中易溶Ca（24.5 g kg〜（-1）（dw）的浓度是芬兰中部耕地中典型值1.6 g kg〜（-1）（dw）的约15倍表明粉煤灰是土壤修复和提高土壤肥力的潜在剂，两种类型的灰均为碱性（pH〜9.4-9.7），这意味着它们具有pH缓冲能力。灰可在森林中用作肥料，本文还举例说明了一些芬兰纸浆和造纸厂如何利用灰烬。

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