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首页> 外文期刊>Journal of Environmental Science and Health >Investigations on phosphorus recovery and reuse as soil amendment from electric arc furnace slag filters
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Investigations on phosphorus recovery and reuse as soil amendment from electric arc furnace slag filters

机译：电弧炉除渣器中磷的改良及土壤改良剂的再利用研究

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Electric arc furnace (EAF) steel slag has been identified as an effective filter material for the removal of phosphorus (P) from both point and non-point sources. To determine the feasibility of land-applying P saturated EAF steel slag this study was undertaken to investigate (i) saturated EAF steel slag material's potential as a P fertilizer or soil amendment and (ii) P desorption and metals leachate from saturated EAF steel slag material to surface runoff. Medicago sativa (alfalfa) was planted in a nutrient depleted washed sand media. Phosphorus was added either as saturated EAF steel slag or as a standard commercial phosphate fertilizer in order to assess the plant availability of the P from saturated EAF steel slag. Four different P application levels were tested: a low (20 lbs acre furrow slice~(-1) (5.5 g P m~(-3))) two medium (40 and 60 lbs. acre f.s.~(-1)(11 and 16.5 g P m~(-3))) and a high (120 lbs. acre f.s.~(-1)(33 g P m~(-3))). The above-ground biomass of half of the plants was harvested after 5 weeks and the second half at 10 weeks. All treatments regardless of the P source used showed high rates of germination. At the first harvest period (5 weeks) significantly higher above-ground biomass (p < 0.01) was seen at the 3 highest P amendment rates in treatments with triple super phosphate fertilizer (TSP) than with EAF steel slag. However, by the second harvest (10 weeks) only the highest amendment rate of TSP showed a significantly higher amount of biomass (p < 0.01), suggesting that EAF steel slag might be an effective slow release P source. In a second experiment, a rain simulator was used to assess desorption of DRP, TP and metals from a saturated and semi-saturated EAF steel slag. The results revealed that the total amounts of DRP and TP released to surface runoff from EAF steel slag were negligible when compared to the total quantities of P retained by this material. Overall the results from this study demonstrated that once the EAF steel slag filter reaches its saturation point, the material could be re-used as soil amendment for the slow release of bioavailable P with minimal risk for loss of P to surface runoff, bringing further benefits to the environment.
机译：电弧炉（EAF）钢渣被认为是一种有效的过滤材料，可从点和非点源中去除磷（P）。为了确定在土地上施用P饱和EAF钢渣的可行性，本研究旨在研究（i）饱和EAF钢渣材料作为P肥或土壤改良剂的潜力，以及（ii）饱和EAF钢渣材料中的P解吸和金属浸出液地表径流。紫花苜蓿（苜蓿）种植在营养贫乏的洗砂介质中。添加磷作为饱和的电弧炉钢渣或作为标准的商业磷肥，以评估饱和的电弧炉钢渣中磷的工厂利用率。测试了四种不同的P施肥水平：低（20磅英亩犁slice〜（-1）（5.5 g P m〜（-3）））两种中等培养基（40和60磅英亩fs〜（-1）（11）和16.5 g P m〜（-3））和高（120磅英亩fs〜（-1）（33 g P m〜（-3）））。 5周后收获一半植物的地上生物量，而10周后收获一半。无论使用何种磷源，所有处理均显示出高发芽率。在第三个收获期（5周），使用三重超级磷酸盐肥料（TSP）处理的土壤磷素改良率最高的3个最高磷修正率（p <0.01）比使用电炉钢渣的高。然而，到第二次收获（10周）时，只有最高的TSP改良率显示出更高的生物量（p <0.01），这表明EAF钢渣可能是有效的缓释磷源。在第二个实验中，使用雨水模拟器评估DRP，TP和金属从饱和和半饱和EAF钢渣中的解吸。结果表明，与该材料保留的P总量相比，从EAF钢渣释放到表面径流的DRP和TP总量可忽略不计。这项研究的总体结果表明，EAF钢渣滤池一旦达到饱和点，该材料就可以重新用作土壤改良剂，以缓慢释放可生物利用的P，同时将P损失到地表径流的风险降至最低，带来进一步的好处环境。

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