Alkaline Pre-Treatment of Coal Fly Ash as Bio-Silica Fertilizer

L. Santi, D. H. Goenadi, D. N. Kalbuadi, I. P. Sari, nbsp, Sulastri
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引用次数: 1

Abstract

This study deals with the pre-treatment of coal fly ash (CFA) by using alkaline substance to improve water solubility of Si which in turn readily available to the plants. Selected weight ratios of CFA/NaOH (s:s) were tested and the highest H4SiO4 yield ratio was selected for further study. X-ray diffraction and scanning electron microscopy analyses were performed to confirm the evidence of structural changes of the CFA upon alkaline treatment. To improve SiO2 dissolution, seven Si-solubilizing fungi, i.e., Aspergillus niger BCC194, A. niger K0909, A. niger A1601, Trichoderma polysporum, T. viride, T. pseudokoningii, and Trichoderma spp, were each inoculated onto pre-treated ash. The results indicated that the relationships between ratio of CFA/NaOH and total and soluble Si were linier (R2 = 0.97** and 0.96**, respectively). Total SiO2 values range from 10.43% to 13.02%, whereas soluble Si contents were 2.30% - 2.64% improved about 300 times compared to un-treated CFA. Both XRD and SEM analyses indicated that alkaline treatment to CFA caused particle damages resulting in increasing soluble Si. Inoculation of pre-treated CFA by T. polysporum up to twelve days of incubation yielded the highest soluble Si. Each fungal species grown on Bunt & Rovira solid media enriched with CFA as Si-source expressed significantly different ability in solubilizing Si from CFA. Citric acid was shown to be stronger compared to acetic and oxalic acids in solubilizing Si from CFA.
粉煤灰作为生物硅肥的碱性预处理研究
本文研究了用碱性物质对粉煤灰进行预处理,以提高硅的水溶性,从而使植物易于获得硅。测试了选定的CFA/NaOH的重量比(s:s),并选择了最高的H4SiO4收率进行进一步研究。x射线衍射和扫描电镜分析证实了碱性处理后CFA结构变化的证据。为了提高SiO2的溶解性,将黑曲霉BCC194、黑曲霉K0909、黑曲霉A1601、多孢木霉、绿霉、假孔木霉和木霉分别接种到预处理灰上。结果表明,CFA/NaOH与总硅和可溶性硅的比值呈线性关系(R2分别为0.97**和0.96**)。总SiO2值为10.43% ~ 13.02%,可溶性Si含量为2.30% ~ 2.64%,比未处理的CFA提高了约300倍。XRD和SEM分析表明,碱法处理对CFA造成颗粒损伤,导致可溶性Si增加。用多孢霉接种预处理过的CFA至12天,可获得最高的可溶性Si。在富含CFA作为硅源的Bunt & Rovira固体培养基上生长的不同真菌对CFA中硅的溶解能力有显著差异。柠檬酸比乙酸和草酸更能溶解CFA中的硅。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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