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首页> 外文期刊>Environmental engineering and management journal >BENCH SCALE TWO STAGE HEAVY METAL LEACHING TEST WITH FLY ASH FROM WOODY BIOMASS COMBUSTION
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BENCH SCALE TWO STAGE HEAVY METAL LEACHING TEST WITH FLY ASH FROM WOODY BIOMASS COMBUSTION

机译：台阶尺度两级重金属浸出试验与木质生物质燃烧的粉煤灰

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摘要

In this paper a two stage bench scale leaching procedure is used to assess the heavy metals release from a wood-based fly ash of a 5.0 MWth grate-fired boiler. In the first step mostly K was leached with water. In the subsequent acid leaching step heavy metals were leached at a pH of 3. The remaining solids were agglomerated together with the bottom ash and the dried K-concentrate from the first leaching step whereas the filtrate was treated before discharge. In the agglomerates produced the heavy metal concentrations were below the limit concentrations for utilization. The loss of nutrients caused by the treatment was about 10% for Ca and for K 8%. The addition of 15% hydrated lime in the agglomeration step showed a very positive effect on the reduction of the fines contained in the product and on the mechanical stability of the agglomerates. The mass of the precipitate from the waste water treatment was about 10% of the mass of the fly ash. Thus, the mass of residue requiring disposal in landfill sites was reduced substantially. The heavy metal concentrations in the treated discharge water were significantly lower than typical limit values for waste water. This paper also presents the current heavy metal limit values for ash used as a soil conditioner in forestry and agriculture in Austria, Finland, Sweden, Denmark and Lithuania.
机译：在本文中，两级台阶浸出程序用于评估5.0 MWTH燃烧锅炉的木制粉煤灰中的重金属释放。在第一步中，大多数是k用水浸出。在随后的酸浸出步骤中，在pH的pH下浸出重金属。将剩余的固体与底灰和干燥的k浓缩物一起凝聚，而来自第一浸出步骤，而滤液在排出前处理。在附聚物中，产生的重金属浓度低于限制浓度以供有。由处理引起的营养物质的丧失约为约10％，并且k 8％。在附聚步骤中加入15％水合石灰对产品中含有的细粉和粘连的机械稳定性的减少表示非常积极的影响。废水处理的沉淀物的质量约为粉煤灰质量的10％。因此，基本上减少了需要处理垃圾填埋场部位的残留物的质量。处理过的排出水中的重金属浓度明显低于废水的典型极限值。本文还介绍了奥地利，芬兰，瑞典，丹麦和立陶宛林业和农业中用作土壤调节剂的灰烬的重金属极限值。

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